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H5T.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Module Info: This module contains most of the "core" functionality of
 *      the H5T interface, including the API initialization code, etc.
 *      Many routines that are infrequently used, or are specialized for
 *      one particular datatype class are in another module.
 */

#define H5T_PACKAGE           /*suppress error about including H5Tpkg     */

/* Pablo information */
/* (Put before include files to avoid problems with inline functions) */
#define PABLO_MASK      H5T_mask

#include "H5private.h"        /*generic functions                 */
#include "H5Dprivate.h"       /*datasets (for H5Tcopy)            */
#include "H5Eprivate.h"       /*error handling              */
#include "H5FLprivate.h"      /* Free Lists                       */
#include "H5Gprivate.h"       /*groups                        */
#include "H5Iprivate.h"       /*ID functions                        */
#include "H5MMprivate.h"      /*memory management                   */
#include "H5Pprivate.h"       /* Property Lists               */
#include "H5Tpkg.h"           /*data-type functions                 */

/* Check for header needed for SGI floating-point code */
#ifdef H5_HAVE_SYS_FPU_H
#include <sys/fpu.h>
#endif /* H5_HAVE_SYS_FPU_H */

/* Interface initialization */
static int interface_initialize_g = 0;
#define INTERFACE_INIT H5T_init_interface

/*
 * Predefined data types. These are initialized at runtime in H5Tinit.c and
 * by H5T_init_interface() in this source file.
 *
 * If more of these are added, the new ones must be added to the list of
 * types to reset in H5T_term_interface().
 */
hid_t H5T_IEEE_F32BE_g              = FAIL;
hid_t H5T_IEEE_F32LE_g              = FAIL;
hid_t H5T_IEEE_F64BE_g              = FAIL;
hid_t H5T_IEEE_F64LE_g              = FAIL;

hid_t H5T_STD_I8BE_g                = FAIL;
hid_t H5T_STD_I8LE_g                = FAIL;
hid_t H5T_STD_I16BE_g               = FAIL;
hid_t H5T_STD_I16LE_g               = FAIL;
hid_t H5T_STD_I32BE_g               = FAIL;
hid_t H5T_STD_I32LE_g               = FAIL;
hid_t H5T_STD_I64BE_g               = FAIL;
hid_t H5T_STD_I64LE_g               = FAIL;
hid_t H5T_STD_U8BE_g                = FAIL;
hid_t H5T_STD_U8LE_g                = FAIL;
hid_t H5T_STD_U16BE_g               = FAIL;
hid_t H5T_STD_U16LE_g               = FAIL;
hid_t H5T_STD_U32BE_g               = FAIL;
hid_t H5T_STD_U32LE_g               = FAIL;
hid_t H5T_STD_U64BE_g               = FAIL;
hid_t H5T_STD_U64LE_g               = FAIL;
hid_t H5T_STD_B8BE_g                = FAIL;
hid_t H5T_STD_B8LE_g                = FAIL;
hid_t H5T_STD_B16BE_g               = FAIL;
hid_t H5T_STD_B16LE_g               = FAIL;
hid_t H5T_STD_B32BE_g               = FAIL;
hid_t H5T_STD_B32LE_g               = FAIL;
hid_t H5T_STD_B64BE_g               = FAIL;
hid_t H5T_STD_B64LE_g               = FAIL;
hid_t H5T_STD_REF_OBJ_g             = FAIL;
hid_t H5T_STD_REF_DSETREG_g         = FAIL;

hid_t H5T_UNIX_D32BE_g              = FAIL;
hid_t H5T_UNIX_D32LE_g              = FAIL;
hid_t H5T_UNIX_D64BE_g              = FAIL;
hid_t H5T_UNIX_D64LE_g              = FAIL;

hid_t H5T_C_S1_g              = FAIL;

hid_t H5T_FORTRAN_S1_g              = FAIL;

hid_t H5T_NATIVE_SCHAR_g            = FAIL;
hid_t H5T_NATIVE_UCHAR_g            = FAIL;
hid_t H5T_NATIVE_SHORT_g            = FAIL;
hid_t H5T_NATIVE_USHORT_g           = FAIL;
hid_t H5T_NATIVE_INT_g              = FAIL;
hid_t H5T_NATIVE_UINT_g             = FAIL;
hid_t H5T_NATIVE_LONG_g             = FAIL;
hid_t H5T_NATIVE_ULONG_g            = FAIL;
hid_t H5T_NATIVE_LLONG_g            = FAIL;
hid_t H5T_NATIVE_ULLONG_g           = FAIL;
hid_t H5T_NATIVE_FLOAT_g            = FAIL;
hid_t H5T_NATIVE_DOUBLE_g           = FAIL;
hid_t H5T_NATIVE_LDOUBLE_g          = FAIL;
hid_t H5T_NATIVE_B8_g               = FAIL;
hid_t H5T_NATIVE_B16_g              = FAIL;
hid_t H5T_NATIVE_B32_g              = FAIL;
hid_t H5T_NATIVE_B64_g              = FAIL;
hid_t H5T_NATIVE_OPAQUE_g           = FAIL;
hid_t H5T_NATIVE_HADDR_g            = FAIL;
hid_t H5T_NATIVE_HSIZE_g            = FAIL;
hid_t H5T_NATIVE_HSSIZE_g           = FAIL;
hid_t H5T_NATIVE_HERR_g             = FAIL;
hid_t H5T_NATIVE_HBOOL_g            = FAIL;

hid_t H5T_NATIVE_INT8_g             = FAIL;
hid_t H5T_NATIVE_UINT8_g            = FAIL;
hid_t H5T_NATIVE_INT_LEAST8_g       = FAIL;
hid_t H5T_NATIVE_UINT_LEAST8_g            = FAIL;
hid_t H5T_NATIVE_INT_FAST8_g        = FAIL;
hid_t H5T_NATIVE_UINT_FAST8_g       = FAIL;

hid_t H5T_NATIVE_INT16_g            = FAIL;
hid_t H5T_NATIVE_UINT16_g           = FAIL;
hid_t H5T_NATIVE_INT_LEAST16_g            = FAIL;
hid_t H5T_NATIVE_UINT_LEAST16_g           = FAIL;
hid_t H5T_NATIVE_INT_FAST16_g       = FAIL;
hid_t H5T_NATIVE_UINT_FAST16_g            = FAIL;

hid_t H5T_NATIVE_INT32_g            = FAIL;
hid_t H5T_NATIVE_UINT32_g           = FAIL;
hid_t H5T_NATIVE_INT_LEAST32_g            = FAIL;
hid_t H5T_NATIVE_UINT_LEAST32_g           = FAIL;
hid_t H5T_NATIVE_INT_FAST32_g       = FAIL;
hid_t H5T_NATIVE_UINT_FAST32_g            = FAIL;

hid_t H5T_NATIVE_INT64_g            = FAIL;
hid_t H5T_NATIVE_UINT64_g           = FAIL;
hid_t H5T_NATIVE_INT_LEAST64_g            = FAIL;
hid_t H5T_NATIVE_UINT_LEAST64_g           = FAIL;
hid_t H5T_NATIVE_INT_FAST64_g       = FAIL;
hid_t H5T_NATIVE_UINT_FAST64_g            = FAIL;

/*
 * Alignment constraints for native types. These are initialized at run time
 * in H5Tinit.c.  These alignments are mainly for offsets in HDF5 compound 
 * datatype or C structures, which are different from the alignments for memory
 * address below this group of variables.
 */
size_t H5T_NATIVE_SCHAR_COMP_ALIGN_g            = 0;
size_t H5T_NATIVE_UCHAR_COMP_ALIGN_g            = 0;
size_t H5T_NATIVE_SHORT_COMP_ALIGN_g            = 0;
size_t H5T_NATIVE_USHORT_COMP_ALIGN_g     = 0;
size_t H5T_NATIVE_INT_COMP_ALIGN_g        = 0;
size_t H5T_NATIVE_UINT_COMP_ALIGN_g       = 0;
size_t H5T_NATIVE_LONG_COMP_ALIGN_g       = 0;
size_t H5T_NATIVE_ULONG_COMP_ALIGN_g            = 0;
size_t H5T_NATIVE_LLONG_COMP_ALIGN_g            = 0;
size_t H5T_NATIVE_ULLONG_COMP_ALIGN_g             = 0;
size_t H5T_NATIVE_FLOAT_COMP_ALIGN_g            = 0;
size_t H5T_NATIVE_DOUBLE_COMP_ALIGN_g             = 0;
size_t H5T_NATIVE_LDOUBLE_COMP_ALIGN_g            = 0;

size_t H5T_POINTER_COMP_ALIGN_g                     = 0;
size_t H5T_HVL_COMP_ALIGN_g                   = 0;
size_t H5T_HOBJREF_COMP_ALIGN_g                     = 0;
size_t H5T_HDSETREGREF_COMP_ALIGN_g         = 0;

/*
 * Alignment constraints for native types. These are initialized at run time
 * in H5Tinit.c
 */
size_t H5T_NATIVE_SCHAR_ALIGN_g           = 0;
size_t H5T_NATIVE_UCHAR_ALIGN_g           = 0;
size_t H5T_NATIVE_SHORT_ALIGN_g           = 0;
size_t H5T_NATIVE_USHORT_ALIGN_g    = 0;
size_t H5T_NATIVE_INT_ALIGN_g       = 0;
size_t H5T_NATIVE_UINT_ALIGN_g            = 0;
size_t H5T_NATIVE_LONG_ALIGN_g            = 0;
size_t H5T_NATIVE_ULONG_ALIGN_g           = 0;
size_t H5T_NATIVE_LLONG_ALIGN_g           = 0;
size_t H5T_NATIVE_ULLONG_ALIGN_g    = 0;
size_t H5T_NATIVE_FLOAT_ALIGN_g           = 0;
size_t H5T_NATIVE_DOUBLE_ALIGN_g    = 0;
size_t H5T_NATIVE_LDOUBLE_ALIGN_g   = 0;

/*
 * Alignment constraints for C9x types. These are initialized at run time in
 * H5Tinit.c if the types are provided by the system. Otherwise we set their
 * values to 0 here (no alignment calculated).
 */
size_t H5T_NATIVE_INT8_ALIGN_g            = 0;
size_t H5T_NATIVE_UINT8_ALIGN_g           = 0;
size_t H5T_NATIVE_INT_LEAST8_ALIGN_g      = 0;
size_t H5T_NATIVE_UINT_LEAST8_ALIGN_g     = 0;
size_t H5T_NATIVE_INT_FAST8_ALIGN_g = 0;
size_t H5T_NATIVE_UINT_FAST8_ALIGN_g      = 0;

size_t H5T_NATIVE_INT16_ALIGN_g           = 0;
size_t H5T_NATIVE_UINT16_ALIGN_g    = 0;
size_t H5T_NATIVE_INT_LEAST16_ALIGN_g     = 0;
size_t H5T_NATIVE_UINT_LEAST16_ALIGN_g    = 0;
size_t H5T_NATIVE_INT_FAST16_ALIGN_g      = 0;
size_t H5T_NATIVE_UINT_FAST16_ALIGN_g     = 0;

size_t H5T_NATIVE_INT32_ALIGN_g           = 0;
size_t H5T_NATIVE_UINT32_ALIGN_g    = 0;
size_t H5T_NATIVE_INT_LEAST32_ALIGN_g     = 0;
size_t H5T_NATIVE_UINT_LEAST32_ALIGN_g    = 0;
size_t H5T_NATIVE_INT_FAST32_ALIGN_g      = 0;
size_t H5T_NATIVE_UINT_FAST32_ALIGN_g     = 0;

size_t H5T_NATIVE_INT64_ALIGN_g           = 0;
size_t H5T_NATIVE_UINT64_ALIGN_g    = 0;
size_t H5T_NATIVE_INT_LEAST64_ALIGN_g     = 0;
size_t H5T_NATIVE_UINT_LEAST64_ALIGN_g    = 0;
size_t H5T_NATIVE_INT_FAST64_ALIGN_g      = 0;
size_t H5T_NATIVE_UINT_FAST64_ALIGN_g     = 0;

/* Useful floating-point values for conversion routines */
/* (+/- Inf for all floating-point types) */
float H5T_NATIVE_FLOAT_POS_INF_g        = 0.0;
float H5T_NATIVE_FLOAT_NEG_INF_g        = 0.0;
double H5T_NATIVE_DOUBLE_POS_INF_g      = 0.0;
double H5T_NATIVE_DOUBLE_NEG_INF_g      = 0.0;


/*
 * The path database. Each path has a source and destination data type pair
 * which is used as the key by which the `entries' array is sorted.
 */
static struct {
    int     npaths;           /*number of paths defined           */
    int     apaths;           /*number of paths allocated         */
    H5T_path_t    **path;           /*sorted array of path pointers           */
    int     nsoft;            /*number of soft conversions defined      */
    int     asoft;            /*number of soft conversions allocated    */
    H5T_soft_t    *soft;            /*unsorted array of soft conversions      */
} H5T_g;

/* The overflow handler */
H5T_overflow_t H5T_overflow_g = NULL;

/* Declare the free list for H5T_t's */
H5FL_DEFINE(H5T_t);

/* Declare the free list for H5T_path_t's */
H5FL_DEFINE(H5T_path_t);

/* Static local functions */
static H5T_t *H5T_open(H5G_entry_t *loc, const char *name, hid_t dxpl_id);
static herr_t H5T_print_stats(H5T_path_t *path, int *nprint/*in,out*/);
static herr_t H5T_unregister(H5T_pers_t pers, const char *name, H5T_t *src,
                H5T_t *dst, H5T_conv_t func, hid_t dxpl_id);
static herr_t H5T_register(H5T_pers_t pers, const char *name, H5T_t *src,
        H5T_t *dst, H5T_conv_t func, hid_t dxpl_id);

/*
 * Type initialization macros
 *
 * These use the "template macro" technique to reduce the amount of gratuitous
 * duplicated code when initializing the datatypes for the library.  The main
 * template macro is the H5T_INIT_TYPE() macro below.
 *
 */

/* Define the code template for types which need no extra initialization for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_NONE_CORE {                                 \
}

/* Define the code template for bitfields for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_BITFIELD_CORE {                                   \
    dt->type = H5T_BITFIELD;                                      \
}

/* Define the code template for times for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_TIME_CORE {                                 \
    dt->type = H5T_TIME;                                          \
}

/* Define the code template for types which reset the offset for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_OFFSET_CORE {                               \
    dt->u.atomic.offset = 0;                                      \
}

/* Define common code for all numeric types (floating-point & int, signed & unsigned) */
#define H5T_INIT_TYPE_NUM_COMMON(ENDIANNESS) {                          \
    dt->u.atomic.order = ENDIANNESS;                                    \
    dt->u.atomic.offset = 0;                                      \
    dt->u.atomic.lsb_pad = H5T_PAD_ZERO;                          \
    dt->u.atomic.msb_pad = H5T_PAD_ZERO;                          \
}

/* Define the code templates for standard floats for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_FLOAT_COMMON(ENDIANNESS) {                        \
    H5T_INIT_TYPE_NUM_COMMON(ENDIANNESS)                          \
    dt->u.atomic.u.f.sign = 31;                                         \
    dt->u.atomic.u.f.epos = 23;                                         \
    dt->u.atomic.u.f.esize = 8;                                         \
    dt->u.atomic.u.f.ebias = 0x7f;                                \
    dt->u.atomic.u.f.mpos = 0;                                          \
    dt->u.atomic.u.f.msize = 23;                                  \
    dt->u.atomic.u.f.norm = H5T_NORM_IMPLIED;                           \
    dt->u.atomic.u.f.pad = H5T_PAD_ZERO;                          \
}

#define H5T_INIT_TYPE_FLOATLE_CORE {                                    \
    H5T_INIT_TYPE_FLOAT_COMMON(H5T_ORDER_LE)                            \
}

#define H5T_INIT_TYPE_FLOATBE_CORE {                                    \
    H5T_INIT_TYPE_FLOAT_COMMON(H5T_ORDER_BE)                            \
}

/* Define the code templates for standard doubles for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_DOUBLE_COMMON(ENDIANNESS) {                       \
    H5T_INIT_TYPE_NUM_COMMON(ENDIANNESS)                          \
    dt->u.atomic.u.f.sign = 63;                                         \
    dt->u.atomic.u.f.epos = 52;                                         \
    dt->u.atomic.u.f.esize = 11;                                  \
    dt->u.atomic.u.f.ebias = 0x03ff;                                    \
    dt->u.atomic.u.f.mpos = 0;                                          \
    dt->u.atomic.u.f.msize = 52;                                  \
    dt->u.atomic.u.f.norm = H5T_NORM_IMPLIED;                           \
    dt->u.atomic.u.f.pad = H5T_PAD_ZERO;                          \
}

#define H5T_INIT_TYPE_DOUBLELE_CORE {                                   \
    H5T_INIT_TYPE_DOUBLE_COMMON(H5T_ORDER_LE)                           \
}

#define H5T_INIT_TYPE_DOUBLEBE_CORE {                                   \
    H5T_INIT_TYPE_DOUBLE_COMMON(H5T_ORDER_BE)                           \
}

/* Define the code templates for standard signed integers for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_SINT_COMMON(ENDIANNESS) {                         \
    H5T_INIT_TYPE_NUM_COMMON(ENDIANNESS)                          \
    dt->u.atomic.u.i.sign = H5T_SGN_2;                                  \
}

#define H5T_INIT_TYPE_SINTLE_CORE {                               \
    H5T_INIT_TYPE_SINT_COMMON(H5T_ORDER_LE)                             \
}

#define H5T_INIT_TYPE_SINTBE_CORE {                               \
    H5T_INIT_TYPE_SINT_COMMON(H5T_ORDER_BE)                             \
}

/* Define the code templates for standard unsigned integers for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_UINT_COMMON(ENDIANNESS) {                         \
    H5T_INIT_TYPE_NUM_COMMON(ENDIANNESS)                          \
    dt->u.atomic.u.i.sign = H5T_SGN_NONE;                         \
}

#define H5T_INIT_TYPE_UINTLE_CORE {                               \
    H5T_INIT_TYPE_UINT_COMMON(H5T_ORDER_LE)                             \
}

#define H5T_INIT_TYPE_UINTBE_CORE {                               \
    H5T_INIT_TYPE_UINT_COMMON(H5T_ORDER_BE)                             \
}

/* Define a macro for common code for all newly allocate datatypes */
#define H5T_INIT_TYPE_ALLOC_COMMON(TYPE) {                              \
    dt->ent.header = HADDR_UNDEF;                                 \
    dt->type = TYPE;                                              \
}

/* Define the code templates for opaque for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_OPAQ_CORE {                                 \
    H5T_INIT_TYPE_ALLOC_COMMON(H5T_OPAQUE)                              \
    dt->u.opaque.tag = H5MM_strdup("");                                 \
}

/* Define the code templates for strings for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_STRING_COMMON {                                   \
    H5T_INIT_TYPE_ALLOC_COMMON(H5T_STRING)                              \
    H5T_INIT_TYPE_NUM_COMMON(H5T_ORDER_NONE)                            \
    dt->u.atomic.u.s.cset = H5T_CSET_ASCII;                             \
}

#define H5T_INIT_TYPE_CSTRING_CORE {                                    \
    H5T_INIT_TYPE_STRING_COMMON                                         \
    dt->u.atomic.u.s.pad = H5T_STR_NULLTERM;                            \
}

#define H5T_INIT_TYPE_FORSTRING_CORE {                                  \
    H5T_INIT_TYPE_STRING_COMMON                                         \
    dt->u.atomic.u.s.pad = H5T_STR_SPACEPAD;                            \
}

/* Define the code templates for references for the "GUTS" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_REF_COMMON(RTYPE) {                         \
    H5T_INIT_TYPE_ALLOC_COMMON(H5T_REFERENCE)                           \
    H5T_INIT_TYPE_NUM_COMMON(H5T_ORDER_NONE)                            \
    dt->u.atomic.u.r.rtype = RTYPE;                               \
}

#define H5T_INIT_TYPE_OBJREF_CORE {                               \
    H5T_INIT_TYPE_REF_COMMON(H5R_OBJECT)                          \
}

#define H5T_INIT_TYPE_REGREF_CORE {                               \
    H5T_INIT_TYPE_REF_COMMON(H5R_DATASET_REGION)                        \
}

/* Define the code templates for the "SIZE_TMPL" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_SET_SIZE(SIZE) {                                  \
    dt->size = SIZE;                                              \
    dt->u.atomic.prec = 8*SIZE;                                         \
}

#define H5T_INIT_TYPE_NOSET_SIZE(SIZE) {                          \
}

/* Define the code templates for the "CRT_TMPL" in the H5T_INIT_TYPE macro */
#define H5T_INIT_TYPE_COPY_CREATE(BASE) {                         \
    /* Base off of existing datatype */                                 \
    if(NULL==(dt = H5T_copy(BASE,H5T_COPY_TRANSIENT)))                        \
        HGOTO_ERROR (H5E_RESOURCE, H5E_CANTCOPY, FAIL, "duplicating base type failed") \
}

#define H5T_INIT_TYPE_ALLOC_CREATE(BASE) {                              \
    /* Allocate new datatype info */                                    \
    if (NULL==(dt = H5FL_CALLOC(H5T_t)))                          \
        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed") \
}

#define H5T_INIT_TYPE(GUTS,GLOBAL,CRT_TMPL,BASE,SIZE_TMPL,SIZE) {       \
    /* Get new datatype struct */                                 \
    H5_GLUE3(H5T_INIT_TYPE_,CRT_TMPL,_CREATE)(BASE)                     \
                                                            \
    /* Adjust information for all types */                              \
    dt->state = H5T_STATE_IMMUTABLE;                                    \
    H5_GLUE3(H5T_INIT_TYPE_,SIZE_TMPL,_SIZE)(SIZE)                      \
                                                            \
    /* Adjust information for this type */                              \
    H5_GLUE3(H5T_INIT_TYPE_,GUTS,_CORE)                                 \
                                                            \
    /* Atomize result */                                          \
    if ((GLOBAL = H5I_register(H5I_DATATYPE, dt)) < 0)                        \
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register datatype atom") \
}


/*-------------------------------------------------------------------------
 * Function:      H5T_init
 *
 * Purpose: Initialize the interface from some other package.
 *
 * Return:  Success:    non-negative
 *
 *          Failure:    negative
 *
 * Programmer:    Robb Matzke
 *              Wednesday, December 16, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_init(void)
{
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5T_init, FAIL);
    /* FUNC_ENTER() does all the work */

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_init_inf
 *
 * Purpose: Initialize the +/- Infinity floating-poing values for type
 *              conversion.
 *
 * Return:  Success:    non-negative
 *
 *          Failure:    negative
 *
 * Programmer:    Quincey Koziol
 *              Saturday, November 22, 2003
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_init_inf(void)
{
    H5T_t   *dst_p;           /* Datatype type operate on */
    H5T_atomic_t *dst;        /* Datatype's atomic info */
    uint8_t *d;             /* Pointer to value to set */
    size_t  half_size;  /* Half the type size */
    size_t      u;              /* Local index value */
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5T_init_inf);

    /* Get the float datatype */
    if (NULL==(dst_p=H5I_object(H5T_NATIVE_FLOAT_g)))
        HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype");
    dst = &dst_p->u.atomic;

    /* Check that we can re-order the bytes correctly */
    if (H5T_ORDER_LE!=dst->order && H5T_ORDER_BE!=dst->order)
        HGOTO_ERROR (H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order");

    /* +Inf */
    d=(uint8_t *)&H5T_NATIVE_FLOAT_POS_INF_g;
    H5T_bit_set (d, dst->u.f.sign, 1, FALSE);
    H5T_bit_set (d, dst->u.f.epos, dst->u.f.esize, TRUE);
    H5T_bit_set (d, dst->u.f.mpos, dst->u.f.msize, FALSE);

    /* Swap the bytes if the machine architecture is big-endian */
    if (H5T_ORDER_BE==dst->order) {
        half_size = dst_p->size/2;
        for (u=0; u<half_size; u++) {
            uint8_t tmp = d[dst_p->size-(u+1)];
            d[dst_p->size-(u+1)] = d[u];
            d[u] = tmp;
        }
    }

    /* -Inf */
    d=(uint8_t *)&H5T_NATIVE_FLOAT_NEG_INF_g;
    H5T_bit_set (d, dst->u.f.sign, 1, TRUE);
    H5T_bit_set (d, dst->u.f.epos, dst->u.f.esize, TRUE);
    H5T_bit_set (d, dst->u.f.mpos, dst->u.f.msize, FALSE);

    /* Swap the bytes if the machine architecture is big-endian */
    if (H5T_ORDER_BE==dst->order) {
        half_size = dst_p->size/2;
        for (u=0; u<half_size; u++) {
            uint8_t tmp = d[dst_p->size-(u+1)];
            d[dst_p->size-(u+1)] = d[u];
            d[u] = tmp;
        }
    }

    /* Get the double datatype */
    if (NULL==(dst_p=H5I_object(H5T_NATIVE_DOUBLE_g)))
        HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype");
    dst = &dst_p->u.atomic;

    /* Check that we can re-order the bytes correctly */
    if (H5T_ORDER_LE!=dst->order && H5T_ORDER_BE!=dst->order)
        HGOTO_ERROR (H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order");

    /* +Inf */
    d=(uint8_t *)&H5T_NATIVE_DOUBLE_POS_INF_g;
    H5T_bit_set (d, dst->u.f.sign, 1, FALSE);
    H5T_bit_set (d, dst->u.f.epos, dst->u.f.esize, TRUE);
    H5T_bit_set (d, dst->u.f.mpos, dst->u.f.msize, FALSE);

    /* Swap the bytes if the machine architecture is big-endian */
    if (H5T_ORDER_BE==dst->order) {
        half_size = dst_p->size/2;
        for (u=0; u<half_size; u++) {
            uint8_t tmp = d[dst_p->size-(u+1)];
            d[dst_p->size-(u+1)] = d[u];
            d[u] = tmp;
        }
    }

    /* -Inf */
    d=(uint8_t *)&H5T_NATIVE_DOUBLE_NEG_INF_g;
    H5T_bit_set (d, dst->u.f.sign, 1, TRUE);
    H5T_bit_set (d, dst->u.f.epos, dst->u.f.esize, TRUE);
    H5T_bit_set (d, dst->u.f.mpos, dst->u.f.msize, FALSE);

    /* Swap the bytes if the machine architecture is big-endian */
    if (H5T_ORDER_BE==dst->order) {
        half_size = dst_p->size/2;
        for (u=0; u<half_size; u++) {
            uint8_t tmp = d[dst_p->size-(u+1)];
            d[dst_p->size-(u+1)] = d[u];
            d[u] = tmp;
        }
    }

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_init_hw
 *
 * Purpose: Perform hardware specific [floating-point] initialization
 *
 * Return:  Success:    non-negative
 *
 *          Failure:    negative
 *
 * Programmer:    Quincey Koziol
 *              Monday, November 24, 2003
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_init_hw(void)
{
#ifdef H5_HAVE_GET_FPC_CSR
    union fpc_csr csr;          /* Union to hold results of floating-point status register query */
#endif /* H5_HAVE_GET_FPC_CSR */
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_init_hw);

#ifdef H5_HAVE_GET_FPC_CSR
    /* [This code is specific to SGI machines] */

    /* Get the floating-point status register */
    csr.fc_word=get_fpc_csr();

    /* If the "flush denormalized values to zero" flag is set, unset it */
    if(csr.fc_struct.flush) {
        csr.fc_struct.flush=0;
        set_fpc_csr(csr.fc_word);
    } /* end if */
#endif /* H5_HAVE_GET_FPC_CSR */

    FUNC_LEAVE_NOAPI(ret_value);
}


/*--------------------------------------------------------------------------
NAME
   H5T_init_interface -- Initialize interface-specific information
USAGE
    herr_t H5T_init_interface()
   
RETURNS
    Non-negative on success/Negative on failure
DESCRIPTION
    Initializes any interface-specific data or routines.

--------------------------------------------------------------------------*/
herr_t
H5T_init_interface(void)
{
    H5T_t       *native_schar=NULL;     /* Datatype structure for native signed char */
    H5T_t       *native_uchar=NULL;     /* Datatype structure for native unsigned char */
    H5T_t       *native_short=NULL;     /* Datatype structure for native short */
    H5T_t       *native_ushort=NULL;    /* Datatype structure for native unsigned short */
    H5T_t       *native_int=NULL;       /* Datatype structure for native int */
    H5T_t       *native_uint=NULL;      /* Datatype structure for native unsigned int */
    H5T_t       *native_long=NULL;      /* Datatype structure for native long */
    H5T_t       *native_ulong=NULL;     /* Datatype structure for native unsigned long */
    H5T_t       *native_llong=NULL;     /* Datatype structure for native llong */
    H5T_t       *native_ullong=NULL;    /* Datatype structure for native unsigned llong */
    H5T_t       *native_float=NULL;     /* Datatype structure for native float */
    H5T_t       *native_double=NULL;    /* Datatype structure for native double */
    H5T_t       *std_u8le=NULL;         /* Datatype structure for unsigned 8-bit little-endian integer */
    H5T_t       *std_u8be=NULL;         /* Datatype structure for unsigned 8-bit big-endian integer */
    H5T_t       *std_u16le=NULL;        /* Datatype structure for unsigned 16-bit little-endian integer */
    H5T_t       *std_u16be=NULL;        /* Datatype structure for unsigned 16-bit big-endian integer */
    H5T_t       *std_u32le=NULL;        /* Datatype structure for unsigned 32-bit little-endian integer */
    H5T_t       *std_u32be=NULL;        /* Datatype structure for unsigned 32-bit big-endian integer */
    H5T_t       *std_i32le=NULL;        /* Datatype structure for signed 32-bit little-endian integer */
    H5T_t       *std_u64le=NULL;        /* Datatype structure for unsigned 64-bit little-endian integer */
    H5T_t       *std_u64be=NULL;        /* Datatype structure for unsigned 64-bit big-endian integer */
    H5T_t       *ieee_f64le=NULL;       /* Datatype structure for IEEE 64-bit little-endian floating-point */
    H5T_t   *dt = NULL;
    H5T_t   *fixedpt=NULL;          /* Datatype structure for native int */
    H5T_t   *floatpt=NULL;          /* Datatype structure for native float */
    H5T_t   *string=NULL;           /* Datatype structure for C string */
    H5T_t   *bitfield=NULL;         /* Datatype structure for bitfield */
    H5T_t   *compound=NULL;         /* Datatype structure for compound objects */
    H5T_t   *enum_type=NULL;        /* Datatype structure for enum objects */
    H5T_t   *vlen=NULL;             /* Datatype structure for vlen objects */
    H5T_t   *array=NULL;            /* Datatype structure for array objects */
    hsize_t     dim[1]={1};             /* Dimension info for array datatype */
    herr_t  status;
    unsigned    copied_dtype=1;         /* Flag to indicate whether datatype was copied or allocated (for error cleanup) */
    herr_t  ret_value=SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT(H5T_init_interface);

    /* Initialize the atom group for the file IDs */
    if (H5I_init_group(H5I_DATATYPE, H5I_DATATYPEID_HASHSIZE, H5T_RESERVED_ATOMS, (H5I_free_t)H5T_close)<0)
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to initialize interface");

    /* Make certain there aren't too many classes of datatypes defined */
    /* Only 16 (numbered 0-15) are supported in the current file format */
    assert(H5T_NCLASSES<16);

    /* Perform any necessary hardware initializations */
    if(H5T_init_hw()<0)
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to initialize interface");

    /*
     * Initialize pre-defined native data types from code generated during
     * the library configuration by H5detect.
     */
    if (H5TN_init_interface()<0)
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to initialize interface");

    /* Get the atomic datatype structures needed by the initialization code below */
    if (NULL==(native_schar=H5I_object(H5T_NATIVE_SCHAR_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_uchar=H5I_object(H5T_NATIVE_UCHAR_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_short=H5I_object(H5T_NATIVE_SHORT_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_ushort=H5I_object(H5T_NATIVE_USHORT_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_int=H5I_object(H5T_NATIVE_INT_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_uint=H5I_object(H5T_NATIVE_UINT_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_long=H5I_object(H5T_NATIVE_LONG_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_ulong=H5I_object(H5T_NATIVE_ULONG_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_llong=H5I_object(H5T_NATIVE_LLONG_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_ullong=H5I_object(H5T_NATIVE_ULLONG_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_float=H5I_object(H5T_NATIVE_FLOAT_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");
    if (NULL==(native_double=H5I_object(H5T_NATIVE_DOUBLE_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype object");

    /*------------------------------------------------------------
     * Native types
     *------------------------------------------------------------ 
     */

    /* 1-byte bit field */
    H5T_INIT_TYPE(BITFIELD,H5T_NATIVE_B8_g,COPY,native_uint,SET,1)
    
    /* 2-byte bit field */
    H5T_INIT_TYPE(BITFIELD,H5T_NATIVE_B16_g,COPY,native_uint,SET,2)
    
    /* 4-byte bit field */
    H5T_INIT_TYPE(BITFIELD,H5T_NATIVE_B32_g,COPY,native_uint,SET,4)
    
    /* 8-byte bit field */
    H5T_INIT_TYPE(BITFIELD,H5T_NATIVE_B64_g,COPY,native_uint,SET,8)
    
    /* haddr_t */
    H5T_INIT_TYPE(OFFSET,H5T_NATIVE_HADDR_g,COPY,native_uint,SET,sizeof(haddr_t))

    /* hsize_t */
    H5T_INIT_TYPE(OFFSET,H5T_NATIVE_HSIZE_g,COPY,native_uint,SET,sizeof(hsize_t))
    
    /* hssize_t */
    H5T_INIT_TYPE(OFFSET,H5T_NATIVE_HSSIZE_g,COPY,native_int,SET,sizeof(hssize_t))
    
    /* herr_t */
    H5T_INIT_TYPE(OFFSET,H5T_NATIVE_HERR_g,COPY,native_int,SET,sizeof(herr_t))

    /* hbool_t */
    H5T_INIT_TYPE(OFFSET,H5T_NATIVE_HBOOL_g,COPY,native_int,SET,sizeof(hbool_t))

    /*------------------------------------------------------------
     * IEEE Types
     *------------------------------------------------------------ 
     */

    /* IEEE 4-byte little-endian float */
    H5T_INIT_TYPE(FLOATLE,H5T_IEEE_F32LE_g,COPY,native_double,SET,4)

    /* IEEE 4-byte big-endian float */
    H5T_INIT_TYPE(FLOATBE,H5T_IEEE_F32BE_g,COPY,native_double,SET,4)

    /* IEEE 8-byte little-endian float */
    H5T_INIT_TYPE(DOUBLELE,H5T_IEEE_F64LE_g,COPY,native_double,SET,8)
    ieee_f64le=dt;    /* Keep type for later */

    /* IEEE 8-byte big-endian float */
    H5T_INIT_TYPE(DOUBLEBE,H5T_IEEE_F64BE_g,COPY,native_double,SET,8)

    /*------------------------------------------------------------
     * Other "standard" types
     *------------------------------------------------------------ 
     */

    /* 1-byte little-endian (endianness is irrelevant) signed integer */
    H5T_INIT_TYPE(SINTLE,H5T_STD_I8LE_g,COPY,native_int,SET,1)
    
    /* 1-byte big-endian (endianness is irrelevant) signed integer */
    H5T_INIT_TYPE(SINTBE,H5T_STD_I8BE_g,COPY,native_int,SET,1)
    
    /* 2-byte little-endian signed integer */
    H5T_INIT_TYPE(SINTLE,H5T_STD_I16LE_g,COPY,native_int,SET,2)
    
    /* 2-byte big-endian signed integer */
    H5T_INIT_TYPE(SINTBE,H5T_STD_I16BE_g,COPY,native_int,SET,2)
    
    /* 4-byte little-endian signed integer */
    H5T_INIT_TYPE(SINTLE,H5T_STD_I32LE_g,COPY,native_int,SET,4)
    std_i32le=dt;    /* Keep type for later */
    
    /* 4-byte big-endian signed integer */
    H5T_INIT_TYPE(SINTBE,H5T_STD_I32BE_g,COPY,native_int,SET,4)
    
    /* 8-byte little-endian signed integer */
    H5T_INIT_TYPE(SINTLE,H5T_STD_I64LE_g,COPY,native_int,SET,8)
    
    /* 8-byte big-endian signed integer */
    H5T_INIT_TYPE(SINTBE,H5T_STD_I64BE_g,COPY,native_int,SET,8)
    
    /* 1-byte little-endian (endianness is irrelevant) unsigned integer */
    H5T_INIT_TYPE(UINTLE,H5T_STD_U8LE_g,COPY,native_uint,SET,1)
    std_u8le=dt;    /* Keep type for later */
    
    /* 1-byte big-endian (endianness is irrelevant) unsigned integer */
    H5T_INIT_TYPE(UINTBE,H5T_STD_U8BE_g,COPY,native_uint,SET,1)
    std_u8be=dt;    /* Keep type for later */
    
    /* 2-byte little-endian unsigned integer */
    H5T_INIT_TYPE(UINTLE,H5T_STD_U16LE_g,COPY,native_uint,SET,2)
    std_u16le=dt;    /* Keep type for later */
    
    /* 2-byte big-endian unsigned integer */
    H5T_INIT_TYPE(UINTBE,H5T_STD_U16BE_g,COPY,native_uint,SET,2)
    std_u16be=dt;    /* Keep type for later */
    
    /* 4-byte little-endian unsigned integer */
    H5T_INIT_TYPE(UINTLE,H5T_STD_U32LE_g,COPY,native_uint,SET,4)
    std_u32le=dt;    /* Keep type for later */
    
    /* 4-byte big-endian unsigned integer */
    H5T_INIT_TYPE(UINTBE,H5T_STD_U32BE_g,COPY,native_uint,SET,4)
    std_u32be=dt;    /* Keep type for later */
    
    /* 8-byte little-endian unsigned integer */
    H5T_INIT_TYPE(UINTLE,H5T_STD_U64LE_g,COPY,native_uint,SET,8)
    std_u64le=dt;    /* Keep type for later */
    
    /* 8-byte big-endian unsigned integer */
    H5T_INIT_TYPE(UINTBE,H5T_STD_U64BE_g,COPY,native_uint,SET,8)
    std_u64be=dt;    /* Keep type for later */
    
    /*------------------------------------------------------------
     * Little- & Big-endian bitfields
     *------------------------------------------------------------ 
     */

    /* little-endian (order is irrelevant) 8-bit bitfield */
    H5T_INIT_TYPE(BITFIELD,H5T_STD_B8LE_g,COPY,std_u8le,NOSET,-)
    bitfield=dt;    /* Keep type for later */

    /* big-endian (order is irrelevant) 8-bit bitfield */
    H5T_INIT_TYPE(BITFIELD,H5T_STD_B8BE_g,COPY,std_u8be,NOSET,-)

    /* Little-endian 16-bit bitfield */
    H5T_INIT_TYPE(BITFIELD,H5T_STD_B16LE_g,COPY,std_u16le,NOSET,-)

    /* Big-endian 16-bit bitfield */
    H5T_INIT_TYPE(BITFIELD,H5T_STD_B16BE_g,COPY,std_u16be,NOSET,-)

    /* Little-endian 32-bit bitfield */
    H5T_INIT_TYPE(BITFIELD,H5T_STD_B32LE_g,COPY,std_u32le,NOSET,-)

    /* Big-endian 32-bit bitfield */
    H5T_INIT_TYPE(BITFIELD,H5T_STD_B32BE_g,COPY,std_u32be,NOSET,-)

    /* Little-endian 64-bit bitfield */
    H5T_INIT_TYPE(BITFIELD,H5T_STD_B64LE_g,COPY,std_u64le,NOSET,-)

    /* Big-endian 64-bit bitfield */
    H5T_INIT_TYPE(BITFIELD,H5T_STD_B64BE_g,COPY,std_u64be,NOSET,-)

    /*------------------------------------------------------------
     * The Unix architecture for dates and times.
     *------------------------------------------------------------ 
     */

    /* Little-endian 32-bit UNIX time_t */
    H5T_INIT_TYPE(TIME,H5T_UNIX_D32LE_g,COPY,std_u32le,NOSET,-)

    /* Big-endian 32-bit UNIX time_t */
    H5T_INIT_TYPE(TIME,H5T_UNIX_D32BE_g,COPY,std_u32be,NOSET,-)

    /* Little-endian 64-bit UNIX time_t */
    H5T_INIT_TYPE(TIME,H5T_UNIX_D64LE_g,COPY,std_u64le,NOSET,-)

    /* Big-endian 64-bit UNIX time_t */
    H5T_INIT_TYPE(TIME,H5T_UNIX_D64BE_g,COPY,std_u64be,NOSET,-)


    /* Indicate that the types that are created from here down are allocated
     * H5FL_ALLOC(), not copied with H5T_copy()
     */
     copied_dtype=0;

    /* Opaque data */
    H5T_INIT_TYPE(OPAQ,H5T_NATIVE_OPAQUE_g,ALLOC,-,SET,1)

    /*------------------------------------------------------------
     * The `C' architecture
     *------------------------------------------------------------ 
     */

    /* One-byte character string */
    H5T_INIT_TYPE(CSTRING,H5T_C_S1_g,ALLOC,-,SET,1)
    string=dt;    /* Keep type for later */

    /*------------------------------------------------------------
     * The `Fortran' architecture
     *------------------------------------------------------------ 
     */

    /* One-byte character string */
    H5T_INIT_TYPE(FORSTRING,H5T_FORTRAN_S1_g,ALLOC,-,SET,1)

    /*------------------------------------------------------------
     * Pointer types
     *------------------------------------------------------------ 
     */

    /* Object pointer (i.e. object header address in file) */
    H5T_INIT_TYPE(OBJREF,H5T_STD_REF_OBJ_g,ALLOC,-,SET,H5R_OBJ_REF_BUF_SIZE)
    
    /* Dataset Region pointer (i.e. selection inside a dataset) */
    H5T_INIT_TYPE(REGREF,H5T_STD_REF_DSETREG_g,ALLOC,-,SET,H5R_DSET_REG_REF_BUF_SIZE)

    /*
     * Register conversion functions beginning with the most general and
     * ending with the most specific.
     */
    fixedpt = native_int;
    floatpt = native_float;
    if (NULL == (compound = H5T_create(H5T_COMPOUND, 1)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype");
    if (NULL == (enum_type = H5T_create(H5T_ENUM, 1)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype");
    if (NULL == (vlen = H5T_vlen_create(native_int)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype");
    if (NULL == (array = H5T_array_create(native_int,1,dim,NULL)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype");
    status = 0;

    status |= H5T_register(H5T_PERS_SOFT, "i_i", fixedpt, fixedpt, H5T_conv_i_i, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "f_f", floatpt, floatpt, H5T_conv_f_f, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "s_s", string, string, H5T_conv_s_s, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "b_b", bitfield, bitfield, H5T_conv_b_b, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "ibo", fixedpt, fixedpt, H5T_conv_order, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "ibo(opt)", fixedpt, fixedpt, H5T_conv_order_opt, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "fbo", floatpt, floatpt, H5T_conv_order, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "fbo(opt)", floatpt, floatpt, H5T_conv_order_opt, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "struct(no-opt)", compound, compound, H5T_conv_struct, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "struct(opt)", compound, compound, H5T_conv_struct_opt, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "enum", enum_type, enum_type, H5T_conv_enum, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "vlen", vlen, vlen, H5T_conv_vlen, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_SOFT, "array", array, array, H5T_conv_array, H5AC_dxpl_id);

    /* Custom conversion for 32-bit ints to 64-bit floats (undocumented) */
    status |= H5T_register(H5T_PERS_HARD, "u32le_f64le", std_u32le, ieee_f64le, H5T_conv_i32le_f64le, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "i32le_f64le", std_i32le, ieee_f64le, H5T_conv_i32le_f64le, H5AC_dxpl_id);

    /*
     * Native conversions should be listed last since we can use hardware to
     * perform the conversion.  We list the odd types like `llong', `long',
     * and `short' before the usual types like `int' and `char' so that when
     * diagnostics are printed we favor the usual names over the odd names
     * when two or more types are the same size.
     */

    /* floating point */
    status |= H5T_register(H5T_PERS_HARD, "flt_dbl", native_float, native_double, H5T_conv_float_double, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "dbl_flt", native_double, native_float, H5T_conv_double_float, H5AC_dxpl_id);

    /* from long_long */
    status |= H5T_register(H5T_PERS_HARD, "llong_ullong", native_llong, native_ullong, H5T_conv_llong_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_llong", native_ullong, native_llong, H5T_conv_ullong_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "llong_long", native_llong, native_long, H5T_conv_llong_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "llong_ulong", native_llong, native_ulong, H5T_conv_llong_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_long", native_ullong, native_long, H5T_conv_ullong_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_ulong", native_ullong, native_ulong, H5T_conv_ullong_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "llong_short", native_llong, native_short, H5T_conv_llong_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "llong_ushort", native_llong, native_ushort, H5T_conv_llong_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_short", native_ullong, native_short, H5T_conv_ullong_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_ushort", native_ullong, native_ushort, H5T_conv_ullong_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "llong_int", native_llong, native_int, H5T_conv_llong_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "llong_uint", native_llong, native_uint, H5T_conv_llong_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_int", native_ullong, native_int, H5T_conv_ullong_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_uint", native_ullong, native_uint, H5T_conv_ullong_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "llong_schar", native_llong, native_schar, H5T_conv_llong_schar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "llong_uchar", native_llong, native_uchar, H5T_conv_llong_uchar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_schar", native_ullong, native_schar, H5T_conv_ullong_schar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ullong_uchar", native_ullong, native_uchar, H5T_conv_ullong_uchar, H5AC_dxpl_id);
    
    /* From long */
    status |= H5T_register(H5T_PERS_HARD, "long_llong", native_long, native_llong, H5T_conv_long_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "long_ullong", native_long, native_ullong, H5T_conv_long_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_llong", native_ulong, native_llong, H5T_conv_ulong_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_ullong", native_ulong, native_ullong, H5T_conv_ulong_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "long_ulong", native_long, native_ulong, H5T_conv_long_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_long", native_ulong, native_long, H5T_conv_ulong_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "long_short", native_long, native_short, H5T_conv_long_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "long_ushort", native_long, native_ushort, H5T_conv_long_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_short", native_ulong, native_short, H5T_conv_ulong_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_ushort", native_ulong, native_ushort, H5T_conv_ulong_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "long_int", native_long, native_int, H5T_conv_long_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "long_uint", native_long, native_uint, H5T_conv_long_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_int", native_ulong, native_int, H5T_conv_ulong_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_uint", native_ulong, native_uint, H5T_conv_ulong_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "long_schar", native_long, native_schar, H5T_conv_long_schar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "long_uchar", native_long, native_uchar, H5T_conv_long_uchar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_schar", native_ulong, native_schar, H5T_conv_ulong_schar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ulong_uchar", native_ulong, native_uchar, H5T_conv_ulong_uchar, H5AC_dxpl_id);
    
    /* From short */
    status |= H5T_register(H5T_PERS_HARD, "short_llong", native_short, native_llong, H5T_conv_short_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "short_ullong", native_short, native_ullong, H5T_conv_short_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_llong", native_ushort, native_llong, H5T_conv_ushort_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_ullong", native_ushort, native_ullong, H5T_conv_ushort_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "short_long", native_short, native_long, H5T_conv_short_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "short_ulong", native_short, native_ulong, H5T_conv_short_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_long", native_ushort, native_long, H5T_conv_ushort_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_ulong", native_ushort, native_ulong, H5T_conv_ushort_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "short_ushort", native_short, native_ushort, H5T_conv_short_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_short", native_ushort, native_short, H5T_conv_ushort_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "short_int", native_short, native_int, H5T_conv_short_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "short_uint", native_short, native_uint, H5T_conv_short_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_int", native_ushort, native_int, H5T_conv_ushort_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_uint", native_ushort, native_uint, H5T_conv_ushort_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "short_schar", native_short, native_schar, H5T_conv_short_schar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "short_uchar", native_short, native_uchar, H5T_conv_short_uchar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_schar", native_ushort, native_schar, H5T_conv_ushort_schar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "ushort_uchar", native_ushort, native_uchar, H5T_conv_ushort_uchar, H5AC_dxpl_id);
    
    /* From int */
    status |= H5T_register(H5T_PERS_HARD, "int_llong", native_int, native_llong, H5T_conv_int_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "int_ullong", native_int, native_ullong, H5T_conv_int_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_llong", native_uint, native_llong, H5T_conv_uint_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_ullong", native_uint, native_ullong, H5T_conv_uint_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "int_long", native_int, native_long, H5T_conv_int_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "int_ulong", native_int, native_ulong, H5T_conv_int_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_long", native_uint, native_long, H5T_conv_uint_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_ulong", native_uint, native_ulong, H5T_conv_uint_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "int_short", native_int, native_short, H5T_conv_int_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "int_ushort", native_int, native_ushort, H5T_conv_int_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_short", native_uint, native_short, H5T_conv_uint_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_ushort", native_uint, native_ushort, H5T_conv_uint_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "int_uint", native_int, native_uint, H5T_conv_int_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_int", native_uint, native_int, H5T_conv_uint_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "int_schar", native_int, native_schar, H5T_conv_int_schar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "int_uchar", native_int, native_uchar, H5T_conv_int_uchar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_schar", native_uint, native_schar, H5T_conv_uint_schar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uint_uchar", native_uint, native_uchar, H5T_conv_uint_uchar, H5AC_dxpl_id);

    /* From char */
    status |= H5T_register(H5T_PERS_HARD, "schar_llong", native_schar, native_llong, H5T_conv_schar_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "schar_ullong", native_schar, native_ullong, H5T_conv_schar_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_llong", native_uchar, native_llong, H5T_conv_uchar_llong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_ullong", native_uchar, native_ullong, H5T_conv_uchar_ullong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "schar_long", native_schar, native_long, H5T_conv_schar_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "schar_ulong", native_schar, native_ulong, H5T_conv_schar_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_long", native_uchar, native_long, H5T_conv_uchar_long, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_ulong", native_uchar, native_ulong, H5T_conv_uchar_ulong, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "schar_short", native_schar, native_short, H5T_conv_schar_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "schar_ushort", native_schar, native_ushort, H5T_conv_schar_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_short", native_uchar, native_short, H5T_conv_uchar_short, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_ushort", native_uchar, native_ushort, H5T_conv_uchar_ushort, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "schar_int", native_schar, native_int, H5T_conv_schar_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "schar_uint", native_schar, native_uint, H5T_conv_schar_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_int", native_uchar, native_int, H5T_conv_uchar_int, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_uint", native_uchar, native_uint, H5T_conv_uchar_uint, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "schar_uchar", native_schar, native_uchar, H5T_conv_schar_uchar, H5AC_dxpl_id);
    status |= H5T_register(H5T_PERS_HARD, "uchar_schar", native_uchar, native_schar, H5T_conv_uchar_schar, H5AC_dxpl_id);

    /*
     * The special no-op conversion is the fastest, so we list it last. The
     * data types we use are not important as long as the source and
     * destination are equal.
     */
    status |= H5T_register(H5T_PERS_HARD, "no-op", native_int, native_int, H5T_conv_noop, H5AC_dxpl_id);

    /* Initialize the +/- Infinity values for floating-point types */
    status |= H5T_init_inf();

    if (status<0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to register conversion function(s)");
    
done:
    /* General cleanup */
    if (compound!=NULL)
        H5T_close(compound);
    if (enum_type!=NULL)
        H5T_close(enum_type);
    if (vlen!=NULL)
        H5T_close(vlen);
    if (array!=NULL)
        H5T_close(array);

    /* Error cleanup */
    if(ret_value<0) {
        if(dt!=NULL) {
            /* Check if we should call H5T_close or H5FL_FREE */
            if(copied_dtype)
                H5T_close(dt);
            else
                H5FL_FREE(H5T_t,dt);
        } /* end if */
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_unlock_cb
 *
 * Purpose: Clear the immutable flag for a data type.  This function is
 *          called when the library is closing in order to unlock all
 *          registered data types and thus make them free-able.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Monday, April 27, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static int
H5T_unlock_cb (void *_dt, hid_t UNUSED id, void UNUSED *key)
{
    H5T_t   *dt = (H5T_t *)_dt;
    
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_unlock_cb);

    assert (dt);
    if (H5T_STATE_IMMUTABLE==dt->state)
      dt->state = H5T_STATE_RDONLY;

    FUNC_LEAVE_NOAPI(SUCCEED);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_term_interface
 *
 * Purpose: Close this interface.
 *
 * Return:  Success:    Positive if any action might have caused a
 *                      change in some other interface; zero
 *                      otherwise.
 *
 *          Failure:    Negative
 *
 * Programmer:    Robb Matzke
 *              Friday, November 20, 1998
 *
 * Modifications:
 *    Robb Matzke, 1998-06-11
 *    Statistics are only printed for conversion functions that were
 *    called.
 *-------------------------------------------------------------------------
 */
int
H5T_term_interface(void)
{
    int     i, nprint=0, n=0;
    H5T_path_t    *path = NULL;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_term_interface);

    if (interface_initialize_g) {
      /* Unregister all conversion functions */
      for (i=0; i<H5T_g.npaths; i++) {
          path = H5T_g.path[i];
          assert (path);
          if (path->func) {
            H5T_print_stats(path, &nprint/*in,out*/);
            path->cdata.command = H5T_CONV_FREE;
            if ((path->func)(FAIL, FAIL, &(path->cdata),
                         (hsize_t)0, 0, 0, NULL, NULL,H5AC_dxpl_id)<0) {
#ifdef H5T_DEBUG
                if (H5DEBUG(T)) {
                  fprintf (H5DEBUG(T), "H5T: conversion function "
                         "0x%08lx failed to free private data for "
                         "%s (ignored)\n",
                         (unsigned long)(path->func), path->name);
                }
#endif
                H5E_clear(); /*ignore the error*/
            }
          }

          H5T_close (path->src);
          H5T_close (path->dst);
            H5FL_FREE(H5T_path_t,path);
          H5T_g.path[i] = NULL;
      }

      /* Clear conversion tables */
      H5T_g.path = H5MM_xfree(H5T_g.path);
      H5T_g.npaths = H5T_g.apaths = 0;
      H5T_g.soft = H5MM_xfree(H5T_g.soft);
      H5T_g.nsoft = H5T_g.asoft = 0;

      /* Unlock all datatypes, then free them */
      H5I_search (H5I_DATATYPE, H5T_unlock_cb, NULL);
      H5I_destroy_group(H5I_DATATYPE);

        /* Reset all the datatype IDs */
        H5T_IEEE_F32BE_g                  = FAIL;
        H5T_IEEE_F32LE_g                  = FAIL;
        H5T_IEEE_F64BE_g                  = FAIL;
        H5T_IEEE_F64LE_g                  = FAIL;

        H5T_STD_I8BE_g              = FAIL;
        H5T_STD_I8LE_g              = FAIL;
        H5T_STD_I16BE_g             = FAIL;
        H5T_STD_I16LE_g             = FAIL;
        H5T_STD_I32BE_g             = FAIL;
        H5T_STD_I32LE_g             = FAIL;
        H5T_STD_I64BE_g             = FAIL;
        H5T_STD_I64LE_g             = FAIL;
        H5T_STD_U8BE_g              = FAIL;
        H5T_STD_U8LE_g              = FAIL;
        H5T_STD_U16BE_g             = FAIL;
        H5T_STD_U16LE_g             = FAIL;
        H5T_STD_U32BE_g             = FAIL;
        H5T_STD_U32LE_g             = FAIL;
        H5T_STD_U64BE_g             = FAIL;
        H5T_STD_U64LE_g             = FAIL;
        H5T_STD_B8BE_g              = FAIL;
        H5T_STD_B8LE_g              = FAIL;
        H5T_STD_B16BE_g             = FAIL;
        H5T_STD_B16LE_g             = FAIL;
        H5T_STD_B32BE_g             = FAIL;
        H5T_STD_B32LE_g             = FAIL;
        H5T_STD_B64BE_g             = FAIL;
        H5T_STD_B64LE_g                   = FAIL;
        H5T_STD_REF_OBJ_g           = FAIL;
        H5T_STD_REF_DSETREG_g             = FAIL;

        H5T_UNIX_D32BE_g                  = FAIL;
        H5T_UNIX_D32LE_g                  = FAIL;
        H5T_UNIX_D64BE_g                  = FAIL;
        H5T_UNIX_D64LE_g                  = FAIL;

        H5T_C_S1_g                  = FAIL;

        H5T_FORTRAN_S1_g                  = FAIL;

        H5T_NATIVE_SCHAR_g          = FAIL;
        H5T_NATIVE_UCHAR_g          = FAIL;
        H5T_NATIVE_SHORT_g          = FAIL;
        H5T_NATIVE_USHORT_g         = FAIL;
        H5T_NATIVE_INT_g                  = FAIL;
        H5T_NATIVE_UINT_g                 = FAIL;
        H5T_NATIVE_LONG_g                 = FAIL;
        H5T_NATIVE_ULONG_g          = FAIL;
        H5T_NATIVE_LLONG_g          = FAIL;
        H5T_NATIVE_ULLONG_g         = FAIL;
        H5T_NATIVE_FLOAT_g          = FAIL;
        H5T_NATIVE_DOUBLE_g         = FAIL;
        H5T_NATIVE_LDOUBLE_g        = FAIL;
        H5T_NATIVE_B8_g             = FAIL;
        H5T_NATIVE_B16_g                  = FAIL;
        H5T_NATIVE_B32_g                  = FAIL;
        H5T_NATIVE_B64_g                  = FAIL;
        H5T_NATIVE_OPAQUE_g         = FAIL;
        H5T_NATIVE_HADDR_g          = FAIL;
        H5T_NATIVE_HSIZE_g          = FAIL;
        H5T_NATIVE_HSSIZE_g         = FAIL;
        H5T_NATIVE_HERR_g                 = FAIL;
        H5T_NATIVE_HBOOL_g          = FAIL;

        H5T_NATIVE_INT8_g                 = FAIL;
        H5T_NATIVE_UINT8_g          = FAIL;
        H5T_NATIVE_INT_LEAST8_g           = FAIL;
        H5T_NATIVE_UINT_LEAST8_g          = FAIL;
        H5T_NATIVE_INT_FAST8_g            = FAIL;
        H5T_NATIVE_UINT_FAST8_g           = FAIL;

        H5T_NATIVE_INT16_g          = FAIL;
        H5T_NATIVE_UINT16_g         = FAIL;
        H5T_NATIVE_INT_LEAST16_g          = FAIL;
        H5T_NATIVE_UINT_LEAST16_g         = FAIL;
        H5T_NATIVE_INT_FAST16_g           = FAIL;
        H5T_NATIVE_UINT_FAST16_g          = FAIL;

        H5T_NATIVE_INT32_g          = FAIL;
        H5T_NATIVE_UINT32_g         = FAIL;
        H5T_NATIVE_INT_LEAST32_g          = FAIL;
        H5T_NATIVE_UINT_LEAST32_g         = FAIL;
        H5T_NATIVE_INT_FAST32_g           = FAIL;
        H5T_NATIVE_UINT_FAST32_g          = FAIL;

        H5T_NATIVE_INT64_g          = FAIL;
        H5T_NATIVE_UINT64_g         = FAIL;
        H5T_NATIVE_INT_LEAST64_g          = FAIL;
        H5T_NATIVE_UINT_LEAST64_g         = FAIL;
        H5T_NATIVE_INT_FAST64_g           = FAIL;
        H5T_NATIVE_UINT_FAST64_g          = FAIL;

      /* Mark interface as closed */
      interface_initialize_g = 0;
      n = 1; /*H5I*/
    }
    FUNC_LEAVE_NOAPI(n);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tcreate
 *
 * Purpose: Create a new type and initialize it to reasonable values.
 *          The type is a member of type class TYPE and is SIZE bytes.
 *
 * Return:  Success:    A new type identifier.
 *
 *          Failure:    Negative
 *
 * Errors:
 *          ARGS    BADVALUE  Invalid size. 
 *          DATATYPE  CANTINIT      Can't create type. 
 *          DATATYPE  CANTREGISTER  Can't register data type atom. 
 *
 * Programmer:    Robb Matzke
 *          Friday, December  5, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Tcreate(H5T_class_t type, size_t size)
{
    H5T_t   *dt = NULL;
    hid_t   ret_value;

    FUNC_ENTER_API(H5Tcreate, FAIL);
    H5TRACE2("i","Ttz",type,size);

    /* check args */
    if (size == 0)
      HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid size");

    /* create the type */
    if (NULL == (dt = H5T_create(type, size)))
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to create type");

    /* Make it an atom */
    if ((ret_value = H5I_register(H5I_DATATYPE, dt)) < 0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register data type atom");

done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Topen
 *
 * Purpose: Opens a named data type.
 *
 * Return:  Success:    Object ID of the named data type.
 *
 *          Failure:    Negative
 *
 * Programmer:    Robb Matzke
 *              Monday, June  1, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Topen(hid_t loc_id, const char *name)
{
    H5G_entry_t   *loc = NULL;
    H5T_t   *type = NULL;
    hid_t   ret_value;
    
    FUNC_ENTER_API(H5Topen, FAIL);
    H5TRACE2("i","is",loc_id,name);

    /* Check args */
    if (NULL==(loc=H5G_loc (loc_id)))
      HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a location");
    if (!name || !*name)
      HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "no name");

    /* Open it */
    if (NULL==(type=H5T_open (loc, name, H5AC_dxpl_id)))
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTOPENOBJ, FAIL, "unable to open named data type");

    /* Register the type and return the ID */
    if ((ret_value=H5I_register (H5I_DATATYPE, type))<0)
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register named data type");

done:
    if(ret_value<0) {
        if(type!=NULL)
            H5T_close (type);
    } /* end if */

    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tcopy
 *
 * Purpose: Copies a data type.  The resulting data type is not locked.
 *          The data type should be closed when no longer needed by
 *          calling H5Tclose().
 *
 * Return:  Success:    The ID of a new data type.
 *
 *          Failure:    Negative
 *
 * Programmer:    Robb Matzke
 *          Tuesday, December  9, 1997
 *
 * Modifications:
 *
 *    Robb Matzke, 4 Jun 1998
 *    The returned type is always transient and unlocked.  If the TYPE_ID
 *    argument is a dataset instead of a data type then this function
 *    returns a transient, modifiable data type which is a copy of the
 *    dataset's data type.
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Tcopy(hid_t type_id)
{
    H5T_t   *dt = NULL;
    H5T_t   *new_dt = NULL;
    H5D_t   *dset = NULL;
    hid_t   ret_value;

    FUNC_ENTER_API(H5Tcopy, FAIL);
    H5TRACE1("i","i",type_id);

    switch (H5I_get_type (type_id)) {
        case H5I_DATATYPE:
            /* The argument is a data type handle */
            if (NULL==(dt=H5I_object (type_id)))
                HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
            break;

        case H5I_DATASET:
            /* The argument is a dataset handle */
            if (NULL==(dset=H5I_object (type_id)))
                HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
            if (NULL==(dt=H5D_typeof (dset)))
                HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to get the dataset data type");
            break;

        default:
            HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type or dataset");
    } /* end switch */

    /* Copy */
    if (NULL == (new_dt = H5T_copy(dt, H5T_COPY_TRANSIENT)))
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to copy");

    /* Atomize result */
    if ((ret_value = H5I_register(H5I_DATATYPE, new_dt)) < 0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register data type atom");
    
done:
    if(ret_value<0) {
        if(new_dt!=NULL)
            H5T_close(new_dt);
    } /* end if */

    FUNC_LEAVE_API(ret_value);
} /* end H5Tcopy() */


/*-------------------------------------------------------------------------
 * Function:      H5Tclose
 *
 * Purpose: Frees a data type and all associated memory.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Tuesday, December  9, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tclose(hid_t type_id)
{
    H5T_t   *dt = NULL;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_API(H5Tclose, FAIL);
    H5TRACE1("e","i",type_id);

    /* Check args */
    if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    if (H5T_STATE_IMMUTABLE==dt->state)
      HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "immutable data type");

    /* When the reference count reaches zero the resources are freed */
    if (H5I_dec_ref(type_id) < 0)
      HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "problem freeing id");
    
done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tequal
 *
 * Purpose: Determines if two data types are equal.
 *
 * Return:  Success:    TRUE if equal, FALSE if unequal
 *
 *          Failure:    Negative
 *
 * Errors:
 *
 * Programmer:    Robb Matzke
 *          Wednesday, December 10, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5Tequal(hid_t type1_id, hid_t type2_id)
{
    const H5T_t         *dt1 = NULL;
    const H5T_t         *dt2 = NULL;
    htri_t        ret_value;

    FUNC_ENTER_API(H5Tequal, FAIL);
    H5TRACE2("b","ii",type1_id,type2_id);

    /* check args */
    if (NULL == (dt1 = H5I_object_verify(type1_id,H5I_DATATYPE)) ||
            NULL == (dt2 = H5I_object_verify(type2_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");

    ret_value = (0 == H5T_cmp(dt1, dt2)) ? TRUE : FALSE;

done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tlock
 *
 * Purpose: Locks a type, making it read only and non-destructable.      This
 *          is normally done by the library for predefined data types so
 *          the application doesn't inadvertently change or delete a
 *          predefined type.
 *
 *          Once a data type is locked it can never be unlocked unless
 *          the entire library is closed.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Friday, January    9, 1998
 *
 * Modifications:
 *
 *    Robb Matzke, 1 Jun 1998
 *    It is illegal to lock a named data type since we must allow named
 *    types to be closed (to release file resources) but locking a type
 *    prevents that.
 *-------------------------------------------------------------------------
 */
herr_t
H5Tlock(hid_t type_id)
{
    H5T_t   *dt = NULL;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_API(H5Tlock, FAIL);
    H5TRACE1("e","i",type_id);

    /* Check args */
    if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    if (H5T_STATE_NAMED==dt->state || H5T_STATE_OPEN==dt->state)
      HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "unable to lock named data type");

    if (H5T_lock (dt, TRUE)<0)
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to lock transient data type");
    
done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tget_class
 *
 * Purpose: Returns the data type class identifier for data type TYPE_ID.
 *
 * Return:  Success:    One of the non-negative data type class
 *                      constants.
 *
 *          Failure:    H5T_NO_CLASS (Negative)
 *
 * Programmer:    Robb Matzke
 *          Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_class_t
H5Tget_class(hid_t type_id)
{
    H5T_t   *dt = NULL;
    H5T_class_t ret_value;       /* Return value */

    FUNC_ENTER_API(H5Tget_class, H5T_NO_CLASS);
    H5TRACE1("Tt","i",type_id);

    /* Check args */
    if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_NO_CLASS, "not a data type");

    /* Set return value */
    ret_value= H5T_get_class(dt);
    
done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_get_class
 *
 * Purpose: Returns the data type class identifier for a datatype ptr.
 *
 * Return:  Success:    One of the non-negative data type class
 *                      constants.
 *
 *          Failure:    H5T_NO_CLASS (Negative)
 *
 * Programmer:    Robb Matzke
 *          Monday, December  8, 1997
 *
 * Modifications:
 *      Broke out from H5Tget_class - QAK - 6/4/99
 *
 *-------------------------------------------------------------------------
 */
H5T_class_t
H5T_get_class(const H5T_t *dt)
{
    H5T_class_t ret_value;

    FUNC_ENTER_NOAPI(H5T_get_class, H5T_NO_CLASS);

    assert(dt);
    
    /* Lie to the user if they have a VL string and tell them it's in the string class */
    if(dt->type==H5T_VLEN && dt->u.vlen.type==H5T_VLEN_STRING)
        ret_value=H5T_STRING;
    else
        ret_value=dt->type;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}   /* end H5T_get_class() */


/*-------------------------------------------------------------------------
 * Function:      H5Tdetect_class
 *
 * Purpose: Check whether a datatype contains (or is) a certain type of
 *          datatype.
 *
 * Return:  TRUE (1) or FALSE (0) on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *          Wednesday, November 29, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5Tdetect_class(hid_t type, H5T_class_t cls)
{
    H5T_t   *dt = NULL;
    htri_t      ret_value;      /* Return value */

    FUNC_ENTER_API(H5Tdetect_class, FAIL);
    H5TRACE2("b","iTt",type,cls);
    
    /* Check args */
    if (NULL == (dt = H5I_object_verify(type,H5I_DATATYPE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_NO_CLASS, "not a data type");
    if (!(cls>H5T_NO_CLASS && cls<H5T_NCLASSES))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_NO_CLASS, "not a data type class");

    /* Set return value */
    ret_value=H5T_detect_class(dt,cls);

done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_detect_class
 *
 * Purpose: Check whether a datatype contains (or is) a certain type of
 *          datatype.
 *
 * Return:  TRUE (1) or FALSE (0) on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *          Wednesday, November 29, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5T_detect_class (const H5T_t *dt, H5T_class_t cls)
{
    int           i;
    htri_t      ret_value=FALSE;        /* Return value */

    FUNC_ENTER_NOAPI(H5T_detect_class, FAIL);
    
    assert(dt);
    assert(cls>H5T_NO_CLASS && cls<H5T_NCLASSES);

    /* Check if this type is the correct type */
    if(dt->type==cls)
        HGOTO_DONE(TRUE);

    /* check for types that might have the correct type as a component */
    switch(dt->type) {
        case H5T_COMPOUND:
            for (i=0; i<dt->u.compnd.nmembs; i++) {
                htri_t nested_ret;      /* Return value from nested call */

                /* Check if this field's type is the correct type */
                if(dt->u.compnd.memb[i].type->type==cls)
                    HGOTO_DONE(TRUE);

                /* Recurse if it's VL, compound, enum or array */
                if(H5T_IS_COMPLEX(dt->u.compnd.memb[i].type->type))
                    if((nested_ret=H5T_detect_class(dt->u.compnd.memb[i].type,cls))!=FALSE)
                        HGOTO_DONE(nested_ret);
            } /* end for */
            break;

        case H5T_ARRAY:
        case H5T_VLEN:
        case H5T_ENUM:
            HGOTO_DONE(H5T_detect_class(dt->parent,cls));

        default:
            break;
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tis_variable_str
 *
 * Purpose: Check whether a datatype is a variable-length string
 *
 * Return:  TRUE (1) or FALSE (0) on success/Negative on failure
 *
 * Programmer:    Raymond Lu
 *          November 4, 2002
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5Tis_variable_str(hid_t dtype_id)
{
    H5T_t   *dt;            /* Datatype to query */
    htri_t      ret_value;      /* Return value */

    FUNC_ENTER_API(H5Tis_variable_str, FAIL);
    H5TRACE1("b","i",dtype_id);
    
    /* Check args */
    if (NULL == (dt = H5I_object_verify(dtype_id,H5I_DATATYPE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");

    /* Set return value */
    ret_value=H5T_is_variable_str(dt);

done:
    FUNC_LEAVE_API(ret_value);   
}
 

/*-------------------------------------------------------------------------
 * Function:      H5T_is_variable_str
 *
 * Purpose: Private function of H5Tis_variable_str.
 *              Check whether a datatype is a variable-length string
 *          
 *
 * Return:  TRUE (1) or FALSE (0) on success/Negative on failure
 *
 * Programmer:    Raymond Lu
 *          November 4, 2002
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5T_is_variable_str(H5T_t *dt)
{
    htri_t      ret_value=FALSE;        /* Return value */

    FUNC_ENTER_NOAPI(H5T_is_variable_str, FAIL);
    
    assert(dt);

    if(H5T_VLEN == dt->type && H5T_VLEN_STRING == dt->u.vlen.type)
        ret_value = TRUE;

done:
    FUNC_LEAVE_NOAPI(ret_value);   
}


/*-------------------------------------------------------------------------
 * Function:      H5Tget_size
 *
 * Purpose: Determines the total size of a data type in bytes.
 *
 * Return:  Success:    Size of the data type in bytes.      The size of
 *                      data type is the size of an instance of that
 *                      data type.
 *
 *          Failure:    0 (valid data types are never zero size)
 *
 * Programmer:    Robb Matzke
 *          Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
size_t
H5Tget_size(hid_t type_id)
{
    H5T_t   *dt = NULL;
    size_t  ret_value;

    FUNC_ENTER_API(H5Tget_size, 0);
    H5TRACE1("z","i",type_id);

    /* Check args */
    if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a data type");
    
    /* size */
    ret_value = H5T_get_size(dt);

done:
    FUNC_LEAVE_API(ret_value);
} /* end H5Tget_size() */


/*-------------------------------------------------------------------------
 * Function:      H5Tset_size
 *
 * Purpose: Sets the total size in bytes for a data type (this operation
 *          is not permitted on reference data types).  If the size is
 *          decreased so that the significant bits of the data type
 *          extend beyond the edge of the new size, then the `offset'
 *          property is decreased toward zero.  If the `offset' becomes
 *          zero and the significant bits of the data type still hang
 *          over the edge of the new size, then the number of significant
 *          bits is decreased.
 *
 *          Adjusting the size of an H5T_STRING automatically sets the
 *          precision to 8*size.
 *
 *          All data types have a positive size.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Wednesday, January  7, 1998
 *
 * Modifications:
 *    Robb Matzke, 22 Dec 1998
 *    Moved the real work into a private function.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_size(hid_t type_id, size_t size)
{
    H5T_t   *dt = NULL;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_API(H5Tset_size, FAIL);
    H5TRACE2("e","iz",type_id,size);

    /* Check args */
    if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    if (H5T_STATE_TRANSIENT!=dt->state)
      HGOTO_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    if (size <= 0 && size!=H5T_VARIABLE)
      HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "size must be positive");
    if (size == H5T_VARIABLE && dt->type!=H5T_STRING)
      HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "only strings may be variable length");
    if (H5T_ENUM==dt->type && dt->u.enumer.nmembs>0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not allowed after members are defined");
    if (H5T_REFERENCE==dt->type)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for this datatype");

    /* Do the work */
    if (H5T_set_size(dt, size)<0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to set size for data type");

done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tget_super
 *
 * Purpose: Returns the type from which TYPE is derived. In the case of
 *          an enumeration type the return value is an integer type.
 *
 * Return:  Success:    Type ID for base data type.
 *
 *          Failure:    negative
 *
 * Programmer:    Robb Matzke
 *              Wednesday, December 23, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Tget_super(hid_t type)
{
    H5T_t   *dt=NULL, *super=NULL;
    hid_t   ret_value;
    
    FUNC_ENTER_API(H5Tget_super, FAIL);
    H5TRACE1("i","i",type);

    if (NULL==(dt=H5I_object_verify(type,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    if((super=H5T_get_super(dt))==NULL)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "not a data type");
    if ((ret_value=H5I_register(H5I_DATATYPE, super))<0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register parent data type");

done:
    if(ret_value<0) {
        if(super!=NULL)
            H5T_close(super);
    } /* end if */

    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_get_super
 *
 * Purpose: Private function for H5Tget_super.  Returns the type from 
 *              which TYPE is derived. In the case of an enumeration type 
 *              the return value is an integer type.
 *
 * Return:  Success:    Data type for base data type.
 *
 *          Failure:        NULL    
 *
 * Programmer:    Raymond Lu
 *              October 9, 2002 
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_t *
H5T_get_super(H5T_t *dt)
{
    H5T_t   *ret_value=NULL;
    
    FUNC_ENTER_NOAPI(H5T_get_super, NULL);

    assert(dt);

    if (!dt->parent)
      HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "not a derived data type");
    if (NULL==(ret_value=H5T_copy(dt->parent, H5T_COPY_ALL)))
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to copy parent data type");

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_register
 *
 * Purpose: Register a hard or soft conversion function for a data type
 *          conversion path.  The path is specified by the source and
 *          destination data types SRC_ID and DST_ID (for soft functions
 *          only the class of these types is important). If FUNC is a
 *          hard function then it replaces any previous path; if it's a
 *          soft function then it replaces all existing paths to which it
 *          applies and is used for any new path to which it applies as
 *          long as that path doesn't have a hard function.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Friday, January    9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_register(H5T_pers_t pers, const char *name, H5T_t *src, H5T_t *dst,
          H5T_conv_t func, hid_t dxpl_id)
{
    hid_t   tmp_sid=-1, tmp_did=-1;/*temporary data type IDs      */
    H5T_path_t    *old_path=NULL;         /*existing conversion path    */
    H5T_path_t    *new_path=NULL;         /*new conversion path         */
    H5T_cdata_t   cdata;                  /*temporary conversion data   */
    int     nprint=0;         /*number of paths shut down   */
    int     i;                /*counter               */
    herr_t  ret_value=SUCCEED;            /*return value                */

    FUNC_ENTER_NOAPI_NOINIT(H5T_register);

    /* Check args */
    assert(src);
    assert(dst);
    assert(func);
    assert(H5T_PERS_HARD==pers || H5T_PERS_SOFT==pers);
    assert(name && *name);

    if (H5T_PERS_HARD==pers) {
      /* Locate or create a new conversion path */
      if (NULL==(new_path=H5T_path_find(src, dst, name, func, dxpl_id)))
          HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to locate/allocate conversion path");
      
      /*
       * Notify all other functions to recalculate private data since some
       * functions might cache a list of conversion functions.  For
       * instance, the compound type converter caches a list of conversion
       * functions for the members, so adding a new function should cause
       * the list to be recalculated to use the new function.
       */
      for (i=0; i<H5T_g.npaths; i++) {
          if (new_path != H5T_g.path[i])
            H5T_g.path[i]->cdata.recalc = TRUE;
      } /* end for */
      
    } else {
        /* Add function to end of soft list */
        if (H5T_g.nsoft>=H5T_g.asoft) {
            size_t na = MAX(32, 2*H5T_g.asoft);
            H5T_soft_t *x = H5MM_realloc(H5T_g.soft, na*sizeof(H5T_soft_t));

            if (!x)
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
            H5T_g.asoft = (int)na;
            H5T_g.soft = x;
        } /* end if */
        HDstrncpy (H5T_g.soft[H5T_g.nsoft].name, name, H5T_NAMELEN);
        H5T_g.soft[H5T_g.nsoft].name[H5T_NAMELEN-1] = '\0';
        H5T_g.soft[H5T_g.nsoft].src = src->type;
        H5T_g.soft[H5T_g.nsoft].dst = dst->type;
        H5T_g.soft[H5T_g.nsoft].func = func;
        H5T_g.nsoft++;

        /*
         * Any existing path (except the no-op path) to which this new soft
         * conversion function applies should be replaced by a new path that
         * uses this function.
         */
        for (i=1; i<H5T_g.npaths; i++) {
            old_path = H5T_g.path[i];
            assert(old_path);

            /* Does the new soft conversion function apply to this path? */
            if (old_path->is_hard ||
                    old_path->src->type!=src->type ||
                    old_path->dst->type!=dst->type) {
                continue;
            }
            if ((tmp_sid = H5I_register(H5I_DATATYPE, H5T_copy(old_path->src, H5T_COPY_ALL)))<0 ||
                    (tmp_did = H5I_register(H5I_DATATYPE, H5T_copy(old_path->dst, H5T_COPY_ALL)))<0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register data types for conv query");
            HDmemset(&cdata, 0, sizeof cdata);
            cdata.command = H5T_CONV_INIT;
            if ((func)(tmp_sid, tmp_did, &cdata, (hsize_t)0, 0, 0, NULL, NULL, dxpl_id)<0) {
                H5I_dec_ref(tmp_sid);
                H5I_dec_ref(tmp_did);
                tmp_sid = tmp_did = -1;
                H5E_clear();
                continue;
            } /* end if */

            /* Create a new conversion path */
            if (NULL==(new_path=H5FL_CALLOC(H5T_path_t)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
            HDstrncpy(new_path->name, name, H5T_NAMELEN);
            new_path->name[H5T_NAMELEN-1] = '\0';
            if (NULL==(new_path->src=H5T_copy(old_path->src, H5T_COPY_ALL)) ||
                    NULL==(new_path->dst=H5T_copy(old_path->dst, H5T_COPY_ALL)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to copy data types");
            new_path->func = func;
            new_path->is_hard = FALSE;
            new_path->cdata = cdata;

            /* Replace previous path */
            H5T_g.path[i] = new_path;
            new_path = NULL; /*so we don't free it on error*/

            /* Free old path */
            H5T_print_stats(old_path, &nprint);
            old_path->cdata.command = H5T_CONV_FREE;
            if ((old_path->func)(tmp_sid, tmp_did, &(old_path->cdata), (hsize_t)0, 0, 0, NULL, NULL, dxpl_id)<0) {
#ifdef H5T_DEBUG
            if (H5DEBUG(T)) {
                fprintf (H5DEBUG(T), "H5T: conversion function 0x%08lx "
                       "failed to free private data for %s (ignored)\n",
                       (unsigned long)(old_path->func), old_path->name);
            }
#endif
            } /* end if */
            H5T_close(old_path->src);
            H5T_close(old_path->dst);
            H5FL_FREE(H5T_path_t,old_path);

            /* Release temporary atoms */
            H5I_dec_ref(tmp_sid);
            H5I_dec_ref(tmp_did);
            tmp_sid = tmp_did = -1;

            /* We don't care about any failures during the freeing process */
            H5E_clear();
        } /* end for */
    } /* end else */
    
done:
    if (ret_value<0) {
      if (new_path) {
          if (new_path->src)
                H5T_close(new_path->src);
          if (new_path->dst)
                H5T_close(new_path->dst);
            H5FL_FREE(H5T_path_t,new_path);
      } /* end if */
      if (tmp_sid>=0)
            H5I_dec_ref(tmp_sid);
      if (tmp_did>=0)
            H5I_dec_ref(tmp_did);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5T_register() */


/*-------------------------------------------------------------------------
 * Function:      H5Tregister
 *
 * Purpose: Register a hard or soft conversion function for a data type
 *          conversion path.  The path is specified by the source and
 *          destination data types SRC_ID and DST_ID (for soft functions
 *          only the class of these types is important). If FUNC is a
 *          hard function then it replaces any previous path; if it's a
 *          soft function then it replaces all existing paths to which it
 *          applies and is used for any new path to which it applies as
 *          long as that path doesn't have a hard function.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Friday, January    9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tregister(H5T_pers_t pers, const char *name, hid_t src_id, hid_t dst_id,
          H5T_conv_t func)
{
    H5T_t   *src;               /*source data type descriptor     */
    H5T_t   *dst;               /*destination data type desc      */
    herr_t  ret_value=SUCCEED;      /*return value                */

    FUNC_ENTER_API(H5Tregister, FAIL);
    H5TRACE5("e","Tesiix",pers,name,src_id,dst_id,func);

    /* Check args */
    if (H5T_PERS_HARD!=pers && H5T_PERS_SOFT!=pers)
      HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid function persistence");
    if (!name || !*name)
      HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "conversion must have a name for debugging");
    if (NULL==(src=H5I_object_verify(src_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    if (NULL==(dst=H5I_object_verify(dst_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    if (!func)
      HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no conversion function specified");

    /* Go register the function */
    if(H5T_register(pers,name,src,dst,func,H5AC_ind_dxpl_id)<0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "can't register conversion function");

done:
    FUNC_LEAVE_API(ret_value);
} /* end H5Tregister() */


/*-------------------------------------------------------------------------
 * Function:      H5T_unregister
 *
 * Purpose: Removes conversion paths that match the specified criteria.
 *          All arguments are optional. Missing arguments are wild cards.
 *          The special no-op path cannot be removed.
 *
 * Return:  Succeess:   non-negative
 *
 *          Failure:    negative
 *
 * Programmer:    Robb Matzke
 *          Tuesday, January 13, 1998
 *
 * Modifications:
 *      Adapted to non-API function - QAK, 11/17/99
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_unregister(H5T_pers_t pers, const char *name, H5T_t *src, H5T_t *dst,
            H5T_conv_t func, hid_t dxpl_id)
{
    H5T_path_t    *path = NULL;           /*conversion path       */
    H5T_soft_t    *soft = NULL;           /*soft conversion information */
    int     nprint=0;         /*number of paths shut down   */
    int     i;                /*counter               */
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5T_unregister, FAIL);

    /* Remove matching entries from the soft list */
    if (H5T_PERS_DONTCARE==pers || H5T_PERS_SOFT==pers) {
        for (i=H5T_g.nsoft-1; i>=0; --i) {
            soft = H5T_g.soft+i;
            assert(soft);
            if (name && *name && HDstrcmp(name, soft->name)) continue;
            if (src && src->type!=soft->src) continue;
            if (dst && dst->type!=soft->dst) continue;
            if (func && func!=soft->func) continue;

            HDmemmove(H5T_g.soft+i, H5T_g.soft+i+1,
                  (H5T_g.nsoft-(i+1)) * sizeof(H5T_soft_t));
            --H5T_g.nsoft;
        }
    }

    /* Remove matching conversion paths, except no-op path */
    for (i=H5T_g.npaths-1; i>0; --i) {
        path = H5T_g.path[i];
        assert(path);
        if ((H5T_PERS_SOFT==pers && path->is_hard) ||
            (H5T_PERS_HARD==pers && !path->is_hard)) continue;
        if (name && *name && HDstrcmp(name, path->name)) continue;
        if (src && H5T_cmp(src, path->src)) continue;
        if (dst && H5T_cmp(dst, path->dst)) continue;
        if (func && func!=path->func) continue;
        
        /* Remove from table */
        HDmemmove(H5T_g.path+i, H5T_g.path+i+1,
              (H5T_g.npaths-(i+1))*sizeof(H5T_path_t*));
        --H5T_g.npaths;

        /* Shut down path */
        H5T_print_stats(path, &nprint);
        path->cdata.command = H5T_CONV_FREE;
        if ((path->func)(FAIL, FAIL, &(path->cdata), (hsize_t)0, 0, 0, NULL, NULL,
                         dxpl_id)<0) {
#ifdef H5T_DEBUG
          if (H5DEBUG(T)) {
            fprintf(H5DEBUG(T), "H5T: conversion function 0x%08lx failed "
                  "to free private data for %s (ignored)\n",
                  (unsigned long)(path->func), path->name);
          }
#endif
        }
        H5T_close(path->src);
        H5T_close(path->dst);
        H5FL_FREE(H5T_path_t,path);
        H5E_clear(); /*ignore all shutdown errors*/
    }

done:
    FUNC_LEAVE_NOAPI(ret_value);
}   /* end H5T_unregister() */


/*-------------------------------------------------------------------------
 * Function:      H5Tunregister
 *
 * Purpose: Removes conversion paths that match the specified criteria.
 *          All arguments are optional. Missing arguments are wild cards.
 *          The special no-op path cannot be removed.
 *
 * Return:  Succeess:   non-negative
 *
 *          Failure:    negative
 *
 * Programmer:    Robb Matzke
 *          Tuesday, January 13, 1998
 *
 * Modifications:
 *      Changed to use H5T_unregister wrapper function - QAK, 11/17/99
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tunregister(H5T_pers_t pers, const char *name, hid_t src_id, hid_t dst_id,
            H5T_conv_t func)
{
    H5T_t   *src=NULL, *dst=NULL;   /*data type descriptors       */
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_API(H5Tunregister, FAIL);
    H5TRACE5("e","Tesiix",pers,name,src_id,dst_id,func);

    /* Check arguments */
    if (src_id>0 && (NULL==(src=H5I_object_verify(src_id,H5I_DATATYPE))))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "src is not a data type");
    if (dst_id>0 && (NULL==(dst=H5I_object_verify(dst_id,H5I_DATATYPE))))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dst is not a data type");

    if (H5T_unregister(pers,name,src,dst,func,H5AC_ind_dxpl_id)<0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTDELETE, FAIL, "internal unregister function failed");

done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tfind
 *
 * Purpose: Finds a conversion function that can handle a conversion from
 *          type SRC_ID to type DST_ID.  The PCDATA argument is a pointer
 *          to a pointer to type conversion data which was created and
 *          initialized by the type conversion function of this path
 *          when the conversion function was installed on the path.
 *
 * Return:  Success:    A pointer to a suitable conversion function.
 *
 *          Failure:    NULL
 *
 * Programmer:    Robb Matzke
 *          Tuesday, January 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_conv_t
H5Tfind(hid_t src_id, hid_t dst_id, H5T_cdata_t **pcdata)
{
    H5T_conv_t    ret_value;
    H5T_t   *src = NULL, *dst = NULL;
    H5T_path_t    *path = NULL;

    FUNC_ENTER_API(H5Tfind, NULL);
    H5TRACE3("x","iix",src_id,dst_id,pcdata);

    /* Check args */
    if (NULL == (src = H5I_object_verify(src_id,H5I_DATATYPE)) ||
            NULL == (dst = H5I_object_verify(dst_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a data type");
    if (!pcdata)
      HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, NULL, "no address to receive cdata pointer");
    
    /* Find it */
    if (NULL==(path=H5T_path_find(src, dst, NULL, NULL, H5AC_ind_dxpl_id)))
      HGOTO_ERROR(H5E_DATATYPE, H5E_NOTFOUND, NULL, "conversion function not found");

    if (pcdata)
        *pcdata = &(path->cdata);

    /* Set return value */
    ret_value = path->func;
    
done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tconvert
 *
 * Purpose: Convert NELMTS elements from type SRC_ID to type DST_ID.  The
 *          source elements are packed in BUF and on return the
 *          destination will be packed in BUF.  That is, the conversion
 *          is performed in place.  The optional background buffer is an
 *          array of NELMTS values of destination type which are merged
 *          with the converted values to fill in cracks (for instance,
 *          BACKGROUND might be an array of structs with the `a' and `b'
 *          fields already initialized and the conversion of BUF supplies
 *          the `c' and `d' field values).  The PLIST_ID a dataset transfer
 *      property list which is passed to the conversion functions.  (It's
 *      currently only used to pass along the VL datatype custom allocation
 *      information -QAK 7/1/99)
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Wednesday, June 10, 1998
 *
 * Modifications:
 *              Added xfer_parms argument to pass VL datatype custom allocation
 *              information down the chain.  - QAK, 7/1/99
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tconvert(hid_t src_id, hid_t dst_id, hsize_t nelmts, void *buf,
          void *background, hid_t dxpl_id)
{
    H5T_path_t          *tpath=NULL;            /*type conversion info  */
    H5T_t         *src=NULL, *dst=NULL;   /*unatomized types      */
    herr_t      ret_value=SUCCEED;       /* Return value */
    
    FUNC_ENTER_API(H5Tconvert, FAIL);
    H5TRACE6("e","iihxxi",src_id,dst_id,nelmts,buf,background,dxpl_id);

    /* Check args */
    if (NULL==(src=H5I_object_verify(src_id,H5I_DATATYPE)) ||
            NULL==(dst=H5I_object_verify(dst_id,H5I_DATATYPE)))
      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    if(H5P_DEFAULT == dxpl_id)
        dxpl_id = H5P_DATASET_XFER_DEFAULT;
    else
        if(TRUE != H5P_isa_class(dxpl_id, H5P_DATASET_XFER))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not dataset transfer property list");

    /* Find the conversion function */
    if (NULL==(tpath=H5T_path_find(src, dst, NULL, NULL, dxpl_id)))
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert between src and dst data types");

    if (H5T_convert(tpath, src_id, dst_id, nelmts, 0, 0, buf, background, dxpl_id)<0)
        HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, FAIL, "data type conversion failed");

done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tget_overflow
 *
 * Purpose: Returns a pointer to the current global overflow function.
 *          This is an application-defined function that is called
 *          whenever a data type conversion causes an overflow.
 *
 * Return:  Success:    Ptr to an application-defined function.
 *
 *          Failure:    NULL (this can happen if no overflow handling
 *                      function is registered).
 *
 * Programmer:    Robb Matzke
 *              Tuesday, July  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_overflow_t
H5Tget_overflow(void)
{
    H5T_overflow_t      ret_value;       /* Return value */

    FUNC_ENTER_API(H5Tget_overflow, NULL);
    H5TRACE0("x","");

    if (NULL==H5T_overflow_g)
      HGOTO_ERROR(H5E_DATATYPE, H5E_UNINITIALIZED, NULL, "no overflow handling function is registered");

    /* Set return value */
    ret_value=H5T_overflow_g;

done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5Tset_overflow
 *
 * Purpose: Sets the overflow handler to be the specified function.  FUNC
 *          will be called for all data type conversions that result in
 *          an overflow.  See the definition of `H5T_overflow_t' for
 *          documentation of arguments and return values.  The NULL
 *          pointer may be passed to remove the overflow handler.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Tuesday, July  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_overflow(H5T_overflow_t func)
{
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_API(H5Tset_overflow, FAIL);
    H5TRACE1("e","x",func);

    H5T_overflow_g = func;

done:
    FUNC_LEAVE_API(ret_value);
}


/*-------------------------------------------------------------------------
 * API functions are above; library-private functions are below...
 *------------------------------------------------------------------------- 
 */


/*-------------------------------------------------------------------------
 * Function:      H5T_create
 *
 * Purpose: Creates a new data type and initializes it to reasonable
 *          values.      The new data type is SIZE bytes and an instance of
 *          the class TYPE.
 *
 * Return:  Success:    Pointer to the new type.
 *
 *          Failure:    NULL
 *
 * Programmer:    Robb Matzke
 *          Friday, December  5, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_t *
H5T_create(H5T_class_t type, size_t size)
{
    H5T_t   *dt = NULL;
    hid_t   subtype;
    H5T_t   *ret_value;

    FUNC_ENTER_NOAPI(H5T_create, NULL);

    assert(size != 0);

    switch (type) {
        case H5T_INTEGER:
        case H5T_FLOAT:
        case H5T_TIME:
        case H5T_STRING:
        case H5T_BITFIELD:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, NULL, "type class is not appropriate - use H5Tcopy()");

        case H5T_OPAQUE:
        case H5T_COMPOUND:
            if (NULL==(dt = H5FL_CALLOC(H5T_t)))
                HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
            dt->type = type;
            if(type==H5T_COMPOUND)
                dt->u.compnd.packed=TRUE;       /* Start out packed */
            break;

        case H5T_ENUM:
            if (sizeof(char)==size) {
                subtype = H5T_NATIVE_SCHAR_g;
            } else if (sizeof(short)==size) {
                subtype = H5T_NATIVE_SHORT_g;
            } else if (sizeof(int)==size) {
                subtype = H5T_NATIVE_INT_g;
            } else if (sizeof(long)==size) {
                subtype = H5T_NATIVE_LONG_g;
            } else if (sizeof(long_long)==size) {
                subtype = H5T_NATIVE_LLONG_g;
            } else {
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "no applicable native integer type");
            }
            if (NULL==(dt = H5FL_CALLOC(H5T_t)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
            dt->type = type;
            if (NULL==(dt->parent=H5T_copy(H5I_object(subtype), H5T_COPY_ALL)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to copy base data type");
        break;

        case H5T_VLEN:  /* Variable length datatype */
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, NULL, "base type required - use H5Tvlen_create()");

        case H5T_ARRAY:  /* Array datatype */
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, NULL, "base type required - use H5Tarray_create()");

        default:
            HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, NULL, "unknown data type class");
    }

    dt->ent.header = HADDR_UNDEF;
    dt->size = size;

    /* Set return value */
    ret_value=dt;

done:
    if(ret_value==NULL) {
        if(dt!=NULL)
            H5FL_FREE(H5T_t,dt);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_isa
 *
 * Purpose: Determines if an object has the requisite messages for being
 *          a data type.
 *
 * Return:  Success:    TRUE if the required data type messages are
 *                      present; FALSE otherwise.
 *
 *          Failure:    FAIL if the existence of certain messages
 *                      cannot be determined.
 *
 * Programmer:    Robb Matzke
 *              Monday, November  2, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5T_isa(H5G_entry_t *ent, hid_t dxpl_id)
{
    htri_t  ret_value;
    
    FUNC_ENTER_NOAPI(H5T_isa, FAIL);
    assert(ent);

    if ((ret_value=H5O_exists(ent, H5O_DTYPE_ID, 0, dxpl_id))<0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to read object header");

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_open
 *
 * Purpose: Open a named data type.
 *
 * Return:  Success:    Ptr to a new data type.
 *
 *          Failure:    NULL
 *
 * Programmer:    Robb Matzke
 *              Monday, June  1, 1998
 *
 * Modifications:
 *      Changed to use H5T_open_oid - QAK - 3/17/99
 *
 *-------------------------------------------------------------------------
 */
static H5T_t *
H5T_open (H5G_entry_t *loc, const char *name, hid_t dxpl_id)
{
    H5T_t   *dt;
    H5G_entry_t   ent;
    H5T_t   *ret_value;
    
    FUNC_ENTER_NOAPI(H5T_open, NULL);

    assert (loc);
    assert (name && *name);

    /*
     * Find the named data type object header and read the data type message
     * from it.
     */
    if (H5G_find (loc, name, NULL, &ent/*out*/, dxpl_id)<0)
      HGOTO_ERROR (H5E_DATATYPE, H5E_NOTFOUND, NULL, "not found");

    /* Open the datatype object */
    if ((dt=H5T_open_oid(&ent, dxpl_id)) ==NULL)
        HGOTO_ERROR(H5E_DATATYPE, H5E_NOTFOUND, NULL, "not found");

    /* Set return value */
    ret_value=dt;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_open_oid
 *
 * Purpose: Open a named data type.
 *
 * Return:  Success:    Ptr to a new data type.
 *
 *          Failure:    NULL
 *
 * Programmer:    Quincey Koziol
 *              Wednesday, March 17, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_t *
H5T_open_oid (H5G_entry_t *ent, hid_t dxpl_id)
{
    H5T_t   *dt=NULL;
    H5T_t   *ret_value;
    
    FUNC_ENTER_NOAPI(H5T_open_oid, NULL);

    assert (ent);

    if (H5O_open (ent)<0)
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTOPENOBJ, NULL, "unable to open named data type");
    if (NULL==(dt=H5O_read (ent, H5O_DTYPE_ID, 0, NULL, dxpl_id)))
      HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to load type message from object header");

    /* Mark the type as named and open */
    dt->state = H5T_STATE_OPEN;
    /* Shallow copy (take ownership) of the group entry object */
    H5G_ent_copy(&(dt->ent),ent,H5G_COPY_SHALLOW);
            
    /* Set return value */
    ret_value=dt;

done:
    if(ret_value==NULL) {
        if(dt==NULL)
            H5O_close(ent);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_copy
 *
 * Purpose: Copies datatype OLD_DT.  The resulting data type is not
 *          locked and is a transient type.
 *
 * Return:  Success:    Pointer to a new copy of the OLD_DT argument.
 *
 *          Failure:    NULL
 *
 * Programmer:    Robb Matzke
 *          Thursday, December  4, 1997
 *
 * Modifications:
 *
 *    Robb Matzke, 4 Jun 1998
 *    Added the METHOD argument.  If it's H5T_COPY_TRANSIENT then the
 *    result will be an unlocked transient type.  Otherwise if it's
 *    H5T_COPY_ALL then the result is a named type if the original is a
 *    named type, but the result is not opened.  Finally, if it's
 *    H5T_COPY_REOPEN and the original type is a named type then the result
 *    is a named type and the type object header is opened again.  The
 *    H5T_COPY_REOPEN method is used when returning a named type to the
 *    application.
 *
 *    Robb Matzke, 22 Dec 1998
 *    Now able to copy enumeration data types.
 *
 *      Robb Matzke, 20 May 1999
 *    Now able to copy opaque types.
 *
 *      Pedro Vicente, <pvn@ncsa.uiuc.edu> 21 Sep 2002
 *      Added a deep copy of the symbol table entry
 *
 *-------------------------------------------------------------------------
 */
H5T_t *
H5T_copy(const H5T_t *old_dt, H5T_copy_t method)
{
    H5T_t   *new_dt=NULL, *tmp=NULL;
    int     i;
    char    *s;
    H5T_t   *ret_value;

    FUNC_ENTER_NOAPI(H5T_copy, NULL);

    /* check args */
    assert(old_dt);

    /* Allocate space */
    if (NULL==(new_dt = H5FL_MALLOC(H5T_t)))
        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");

    /* Copy actual information */
    *new_dt = *old_dt; 
                              
    /* Copy parent information */
    if (new_dt->parent)
        new_dt->parent = H5T_copy(new_dt->parent, method);

    /* Check what sort of copy we are making */
    switch (method) {
        case H5T_COPY_TRANSIENT:
            /*
             * Return an unlocked transient type.
             */
            new_dt->state = H5T_STATE_TRANSIENT;
            HDmemset (&(new_dt->ent), 0, sizeof(new_dt->ent));
            new_dt->ent.header = HADDR_UNDEF;
            break;
        
        case H5T_COPY_ALL:
            /*
             * Return a transient type (locked or unlocked) or an unopened named
             * type.  Immutable transient types are degraded to read-only.
             */
            if (H5T_STATE_OPEN==new_dt->state) {
                new_dt->state = H5T_STATE_NAMED;
            } else if (H5T_STATE_IMMUTABLE==new_dt->state) {
                new_dt->state = H5T_STATE_RDONLY;
            }
            break;

        case H5T_COPY_REOPEN:
            /*
             * Return a transient type (locked or unlocked) or an opened named
             * type.
             */
            if (H5F_addr_defined(new_dt->ent.header)) {
                if (H5O_open (&(new_dt->ent))<0)
                    HGOTO_ERROR (H5E_DATATYPE, H5E_CANTOPENOBJ, NULL, "unable to reopen named data type");
                new_dt->state = H5T_STATE_OPEN;
            }
            break;
    } /* end switch */
    
    switch(new_dt->type) {
        case H5T_COMPOUND:
            {
            int accum_change=0;    /* Amount of change in the offset of the fields */

            /*
             * Copy all member fields to new type, then overwrite the
             * name and type fields of each new member with copied values.
             * That is, H5T_copy() is a deep copy.
             */
            new_dt->u.compnd.memb = H5MM_malloc(new_dt->u.compnd.nalloc *
                                sizeof(H5T_cmemb_t));
            if (NULL==new_dt->u.compnd.memb)
                HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");

            HDmemcpy(new_dt->u.compnd.memb, old_dt->u.compnd.memb,
                 new_dt->u.compnd.nmembs * sizeof(H5T_cmemb_t));

            for (i=0; i<new_dt->u.compnd.nmembs; i++) {
                int     j;
                int    old_match;

                s = new_dt->u.compnd.memb[i].name;
                new_dt->u.compnd.memb[i].name = H5MM_xstrdup(s);
                tmp = H5T_copy (old_dt->u.compnd.memb[i].type, method);
                new_dt->u.compnd.memb[i].type = tmp;

                /* Apply the accumulated size change to the offset of the field */
                new_dt->u.compnd.memb[i].offset += accum_change;

                if(old_dt->u.compnd.sorted != H5T_SORT_VALUE) {
                    for (old_match=-1, j=0; j<old_dt->u.compnd.nmembs; j++) {
                        if(!HDstrcmp(new_dt->u.compnd.memb[i].name,old_dt->u.compnd.memb[j].name)) {
                            old_match=j;
                            break;
                        } /* end if */
                    } /* end for */

                    /* check if we couldn't find a match */
                    if(old_match<0)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCOPY, NULL, "fields in datatype corrupted");
                } /* end if */
                else {
                    old_match=i;
                } /* end else */

                /* If the field changed size, add that change to the accumulated size change */
                if(new_dt->u.compnd.memb[i].type->size != old_dt->u.compnd.memb[old_match].type->size) {
                    /* Adjust the size of the member */
                    new_dt->u.compnd.memb[i].size = (old_dt->u.compnd.memb[old_match].size*tmp->size)/old_dt->u.compnd.memb[old_match].type->size;

                    accum_change += (new_dt->u.compnd.memb[i].type->size - old_dt->u.compnd.memb[old_match].type->size);
                } /* end if */
            } /* end for */

            /* Apply the accumulated size change to the size of the compound struct */
            new_dt->size += accum_change;

            }
            break;

        case H5T_ENUM:
            /*
             * Copy all member fields to new type, then overwrite the name fields
             * of each new member with copied values. That is, H5T_copy() is a
             * deep copy.
             */
            new_dt->u.enumer.name = H5MM_malloc(new_dt->u.enumer.nalloc *
                                sizeof(char*));
            new_dt->u.enumer.value = H5MM_malloc(new_dt->u.enumer.nalloc *
                                 new_dt->size);
            if (NULL==new_dt->u.enumer.value)
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
            HDmemcpy(new_dt->u.enumer.value, old_dt->u.enumer.value,
                 new_dt->u.enumer.nmembs * new_dt->size);
            for (i=0; i<new_dt->u.enumer.nmembs; i++) {
                s = old_dt->u.enumer.name[i];
                new_dt->u.enumer.name[i] = H5MM_xstrdup(s);
            } 
            break;

        case H5T_VLEN:
            if(method==H5T_COPY_TRANSIENT || method==H5T_COPY_REOPEN) {
                /* H5T_copy converts any VL type into a memory VL type */
                if (H5T_vlen_mark(new_dt, NULL, H5T_VLEN_MEMORY)<0)
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "invalid VL location");
            }
            break;

        case H5T_OPAQUE:
            /*
             * Copy the tag name.
             */
            new_dt->u.opaque.tag = HDstrdup(new_dt->u.opaque.tag);
            break;

        case H5T_ARRAY:
            /* Re-compute the array's size, in case it's base type changed size */
            new_dt->size=new_dt->u.array.nelem*new_dt->parent->size;
            break;

        default:
            break;
    } /* end switch */

    /* Deep copy of the symbol table entry */
    if (H5G_ent_copy(&(new_dt->ent), &(old_dt->ent),H5G_COPY_DEEP)<0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, NULL, "unable to copy entry");
                              
    /* Set return value */
    ret_value=new_dt;
    
done:
    if(ret_value==NULL) {
        if(new_dt!=NULL)
            H5FL_FREE (H5T_t,new_dt);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_lock
 *
 * Purpose: Lock a transient data type making it read-only.  If IMMUTABLE
 *          is set then the type cannot be closed except when the library
 *          itself closes.
 *
 *          This function is a no-op if the type is not transient or if
 *          the type is already read-only or immutable.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Thursday, June  4, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_lock (H5T_t *dt, hbool_t immutable)
{
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5T_lock, FAIL);
    assert (dt);

    switch (dt->state) {
        case H5T_STATE_TRANSIENT:
            dt->state = immutable ? H5T_STATE_IMMUTABLE : H5T_STATE_RDONLY;
            break;
        case H5T_STATE_RDONLY:
            if (immutable) dt->state = H5T_STATE_IMMUTABLE;
            break;
        case H5T_STATE_IMMUTABLE:
        case H5T_STATE_NAMED:
        case H5T_STATE_OPEN:
            /*void*/
            break;
    }

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_free
 *
 * Purpose: Frees all memory associated with a datatype, but does not
 *              free the H5T_t structure (which should be done in H5T_close).
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *          Monday, January  6, 2003
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_free(H5T_t *dt)
{
    int     i;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5T_free, FAIL);

    assert(dt);

    /*
     * If a named type is being closed then close the object header also.
     */
    if (H5T_STATE_OPEN==dt->state) {
      assert (H5F_addr_defined(dt->ent.header));
      if (H5O_close(&(dt->ent))<0)
          HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to close data type object header");
      dt->state = H5T_STATE_NAMED;
    }

    /*
     * Don't free locked datatypes.
     */
    if (H5T_STATE_IMMUTABLE==dt->state)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CLOSEERROR, FAIL, "unable to close immutable datatype");

    /* Close the datatype */
    switch (dt->type) {
        case H5T_COMPOUND:
            for (i=0; i<dt->u.compnd.nmembs; i++) {
                H5MM_xfree(dt->u.compnd.memb[i].name);
                H5T_close(dt->u.compnd.memb[i].type);
            }
            H5MM_xfree(dt->u.compnd.memb);
            break;

        case H5T_ENUM:
            for (i=0; i<dt->u.enumer.nmembs; i++)
                H5MM_xfree(dt->u.enumer.name[i]);
            H5MM_xfree(dt->u.enumer.name);
            H5MM_xfree(dt->u.enumer.value);
            break;

        case H5T_OPAQUE:
            H5MM_xfree(dt->u.opaque.tag);
            break;

        default:
            break;
    }

    /* Free the ID to name info */
    H5G_free_ent_name(&(dt->ent));

    /* Close the parent */
    if (dt->parent && H5T_close(dt->parent)<0)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to close parent data type");
    
done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5T_free() */


/*-------------------------------------------------------------------------
 * Function:      H5T_close
 *
 * Purpose: Frees a data type and all associated memory.  If the data
 *          type is locked then nothing happens.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Monday, December  8, 1997
 *
 * Modifications:
 *      Robb Matzke, 1999-04-27
 *      This function fails if the datatype state is IMMUTABLE.
 *
 *      Robb Matzke, 1999-05-20
 *      Closes opaque types also.
 *
 *      Pedro Vicente, <pvn@ncsa.uiuc.edu> 22 Aug 2002
 *      Added "ID to name" support
 *
 *      Quincey Koziol, 2003-01-06
 *      Moved "guts" of function to H5T_free()
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_close(H5T_t *dt)
{
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5T_close, FAIL);

    assert(dt);

    if(H5T_free(dt)<0) 
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTFREE, FAIL, "unable to free datatype");

    /* Free the datatype struct */
    H5FL_FREE(H5T_t,dt);

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_is_atomic
 *
 * Purpose: Determines if a data type is an atomic type.
 *
 * Return:  Success:    TRUE, FALSE
 *
 *          Failure:    Negative
 *
 * Programmer:    Robb Matzke
 *          Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5T_is_atomic(const H5T_t *dt)
{
    htri_t  ret_value;
    
    FUNC_ENTER_NOAPI(H5T_is_atomic, FAIL);

    assert(dt);

    if (!H5T_IS_COMPLEX(dt->type) && H5T_OPAQUE!=dt->type)
      ret_value = TRUE;
    else
      ret_value = FALSE;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_set_size
 *
 * Purpose: Sets the total size in bytes for a data type (this operation
 *          is not permitted on reference data types).  If the size is
 *          decreased so that the significant bits of the data type
 *          extend beyond the edge of the new size, then the `offset'
 *          property is decreased toward zero.  If the `offset' becomes
 *          zero and the significant bits of the data type still hang
 *          over the edge of the new size, then the number of significant
 *          bits is decreased.
 *
 *          Adjusting the size of an H5T_STRING automatically sets the
 *          precision to 8*size.
 *
 *          All data types have a positive size.
 *
 * Return:  Success:    non-negative
 *
 *          Failure:    nagative
 *
 * Programmer:    Robb Matzke
 *              Tuesday, December 22, 1998
 *
 * Modifications:
 *    Robb Matzke, 22 Dec 1998
 *    Also works with derived data types.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_set_size(H5T_t *dt, size_t size)
{
    size_t  prec, offset;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5T_set_size, FAIL);

    /* Check args */
    assert(dt);
    assert(size!=0);
    assert(H5T_REFERENCE!=dt->type);
    assert(!(H5T_ENUM==dt->type && 0==dt->u.enumer.nmembs));
    assert(!(H5T_COMPOUND==dt->type && 0==dt->u.compnd.nmembs));

    if (dt->parent) {
        if (H5T_set_size(dt->parent, size)<0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to set size for parent data type");

        /* Adjust size of datatype appropriately */
        if(dt->type==H5T_ARRAY)
            dt->size = dt->parent->size * dt->u.array.nelem;
        else if(dt->type!=H5T_VLEN)
            dt->size = dt->parent->size;
    } else {
        if (H5T_is_atomic(dt)) {
            offset = dt->u.atomic.offset;
            prec = dt->u.atomic.prec;

            /* Decrement the offset and precision if necessary */
            if (prec > 8*size)
                offset = 0;
            else
                if (offset+prec > 8*size)
                    offset = 8 * size - prec;
            if (prec > 8*size)
                prec = 8 * size;
        } else {
            prec = offset = 0;
        }

        switch (dt->type) {
            case H5T_INTEGER:
            case H5T_TIME:
            case H5T_BITFIELD:
            case H5T_OPAQUE:
                /* nothing to check */
                break;

            case H5T_COMPOUND:
                if(size<dt->size)
                    HGOTO_ERROR(H5E_DATATYPE, H5E_BADVALUE, FAIL, "can't shrink compound datatype");
                break;

            case H5T_STRING:
                /* Convert string to variable-length datatype */
                if(size==H5T_VARIABLE) {
                    H5T_t     *base = NULL;           /* base data type */
                    H5T_cset_t  tmp_cset;               /* Temp. cset info */
                    H5T_str_t   tmp_strpad;             /* Temp. strpad info */

                    /* Get a copy of unsigned char type as the base/parent type */
                    if (NULL==(base=H5I_object(H5T_NATIVE_UCHAR)))
                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid base datatype");
                    dt->parent=H5T_copy(base,H5T_COPY_ALL);

                    /* change this datatype into a VL string */
                    dt->type = H5T_VLEN;

                    /*
                     * Force conversions (i.e. memory to memory conversions 
                 * should duplicate data, not point to the same VL strings)
                     */
                    dt->force_conv = TRUE;

                /* Before we mess with the info in the union, extract the 
                 * values we need */
                    tmp_cset=dt->u.atomic.u.s.cset;
                    tmp_strpad=dt->u.atomic.u.s.pad;

                    /* This is a string, not a sequence */
                    dt->u.vlen.type = H5T_VLEN_STRING;

                    /* Set character set and padding information */
                    dt->u.vlen.cset = tmp_cset;
                    dt->u.vlen.pad  = tmp_strpad;

                    /* Set up VL information */
                    if (H5T_vlen_mark(dt, NULL, H5T_VLEN_MEMORY)<0)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "invalid VL location");

                } else {
                    prec = 8 * size;
                    offset = 0;
                } /* end else */
                break;

            case H5T_FLOAT:
                /*
                 * The sign, mantissa, and exponent fields should be adjusted
                 * first when decreasing the size of a floating point type.
                 */
                if (dt->u.atomic.u.f.sign >= prec ||
                        dt->u.atomic.u.f.epos + dt->u.atomic.u.f.esize > prec ||
                        dt->u.atomic.u.f.mpos + dt->u.atomic.u.f.msize > prec) {
                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "adjust sign, mantissa, and exponent fields first");
                }
                break;

            case H5T_ENUM:
            case H5T_VLEN:
            case H5T_ARRAY:
                assert("can't happen" && 0);
            case H5T_REFERENCE:
                assert("invalid type" && 0);
            default:
                assert("not implemented yet" && 0);
        }

        /* Commit (if we didn't convert this type to a VL string) */
        if(dt->type!=H5T_VLEN) {
            dt->size = size;
            if (H5T_is_atomic(dt)) {
                dt->u.atomic.offset = offset;
                dt->u.atomic.prec = prec;
            }
        } /* end if */
    }
    
done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_get_size
 *
 * Purpose: Determines the total size of a data type in bytes.
 *
 * Return:  Success:    Size of the data type in bytes.      The size of
 *                      the data type is the size of an instance of
 *                      that data type.
 *
 *          Failure:    0 (valid data types are never zero size)
 *
 * Programmer:    Robb Matzke
 *          Tuesday, December  9, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
size_t
H5T_get_size(const H5T_t *dt)
{
    /* Use FUNC_ENTER_NOAPI_NOINIT_NOFUNC here to avoid performance issues */
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_get_size);

    /* check args */
    assert(dt);

    FUNC_LEAVE_NOAPI(dt->size);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_cmp
 *
 * Purpose: Compares two data types.
 *
 * Return:  Success:    0 if DT1 and DT2 are equal.
 *                      <0 if DT1 is less than DT2.
 *                      >0 if DT1 is greater than DT2.
 *
 *          Failure:    0, never fails
 *
 * Programmer:    Robb Matzke
 *          Wednesday, December 10, 1997
 *
 * Modifications:
 *    Robb Matzke, 22 Dec 1998
 *    Able to compare enumeration data types.
 *
 *    Robb Matzke, 20 May 1999
 *    Compares bitfields and opaque types.
 *-------------------------------------------------------------------------
 */
int
H5T_cmp(const H5T_t *dt1, const H5T_t *dt2)
{
    int     *idx1 = NULL, *idx2 = NULL;
    int     ret_value = 0;
    int     i, j, tmp;
    hbool_t swapped;
    size_t  base_size;

    FUNC_ENTER_NOAPI(H5T_cmp, 0);

    /* the easy case */
    if (dt1 == dt2) HGOTO_DONE(0);
    assert(dt1);
    assert(dt2);

    /* compare */
    if (dt1->type < dt2->type) HGOTO_DONE(-1);
    if (dt1->type > dt2->type) HGOTO_DONE(1);

    if (dt1->size < dt2->size) HGOTO_DONE(-1);
    if (dt1->size > dt2->size) HGOTO_DONE(1);

    if (dt1->parent && !dt2->parent) HGOTO_DONE(-1);
    if (!dt1->parent && dt2->parent) HGOTO_DONE(1);
    if (dt1->parent) {
      tmp = H5T_cmp(dt1->parent, dt2->parent);
      if (tmp<0) HGOTO_DONE(-1);
      if (tmp>0) HGOTO_DONE(1);
    }

    switch(dt1->type) {
        case H5T_COMPOUND:
            /*
             * Compound data types...
             */
            if (dt1->u.compnd.nmembs < dt2->u.compnd.nmembs)
                HGOTO_DONE(-1);
            if (dt1->u.compnd.nmembs > dt2->u.compnd.nmembs)
                HGOTO_DONE(1);

            /* Build an index for each type so the names are sorted */
            if (NULL==(idx1 = H5MM_malloc(dt1->u.compnd.nmembs * sizeof(int))) ||
                    NULL==(idx2 = H5MM_malloc(dt1->u.compnd.nmembs * sizeof(int))))
                HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed");
            for (i=0; i<dt1->u.compnd.nmembs; i++)
                idx1[i] = idx2[i] = i;
            for (i=dt1->u.compnd.nmembs-1, swapped=TRUE; swapped && i>=0; --i) {
                for (j=0, swapped=FALSE; j<i; j++) {
                    if (HDstrcmp(dt1->u.compnd.memb[idx1[j]].name,
                             dt1->u.compnd.memb[idx1[j+1]].name) > 0) {
                        tmp = idx1[j];
                        idx1[j] = idx1[j+1];
                        idx1[j+1] = tmp;
                        swapped = TRUE;
                    }
                }
            }
            for (i=dt2->u.compnd.nmembs-1, swapped=TRUE; swapped && i>=0; --i) {
                for (j=0, swapped=FALSE; j<i; j++) {
                    if (HDstrcmp(dt2->u.compnd.memb[idx2[j]].name,
                             dt2->u.compnd.memb[idx2[j+1]].name) > 0) {
                        tmp = idx2[j];
                        idx2[j] = idx2[j+1];
                        idx2[j+1] = tmp;
                        swapped = TRUE;
                    }
                }
            }

#ifdef H5T_DEBUG
            /* I don't quite trust the code above yet :-)  --RPM */
            for (i=0; i<dt1->u.compnd.nmembs-1; i++) {
                assert(HDstrcmp(dt1->u.compnd.memb[idx1[i]].name,
                        dt1->u.compnd.memb[idx1[i + 1]].name));
                assert(HDstrcmp(dt2->u.compnd.memb[idx2[i]].name,
                        dt2->u.compnd.memb[idx2[i + 1]].name));
            }
#endif

            /* Compare the members */
            for (i=0; i<dt1->u.compnd.nmembs; i++) {
                tmp = HDstrcmp(dt1->u.compnd.memb[idx1[i]].name,
                       dt2->u.compnd.memb[idx2[i]].name);
                if (tmp < 0)
                    HGOTO_DONE(-1);
                if (tmp > 0)
                    HGOTO_DONE(1);

                if (dt1->u.compnd.memb[idx1[i]].offset <
                dt2->u.compnd.memb[idx2[i]].offset) HGOTO_DONE(-1);
                if (dt1->u.compnd.memb[idx1[i]].offset >
                dt2->u.compnd.memb[idx2[i]].offset) HGOTO_DONE(1);

                if (dt1->u.compnd.memb[idx1[i]].size <
                dt2->u.compnd.memb[idx2[i]].size) HGOTO_DONE(-1);
                if (dt1->u.compnd.memb[idx1[i]].size >
                dt2->u.compnd.memb[idx2[i]].size) HGOTO_DONE(1);

                tmp = H5T_cmp(dt1->u.compnd.memb[idx1[i]].type,
                      dt2->u.compnd.memb[idx2[i]].type);
                if (tmp < 0) HGOTO_DONE(-1);
                if (tmp > 0) HGOTO_DONE(1);
            }
            break;

        case H5T_ENUM:
            /*
             * Enumeration data types...
             */
            if (dt1->u.enumer.nmembs < dt2->u.enumer.nmembs)
                HGOTO_DONE(-1);
            if (dt1->u.enumer.nmembs > dt2->u.enumer.nmembs)
                HGOTO_DONE(1);

            /* Build an index for each type so the names are sorted */
            if (NULL==(idx1 = H5MM_malloc(dt1->u.enumer.nmembs * sizeof(int))) ||
                    NULL==(idx2 = H5MM_malloc(dt1->u.enumer.nmembs * sizeof(int))))
                HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed");
            for (i=0; i<dt1->u.enumer.nmembs; i++)
                idx1[i] = idx2[i] = i;
            for (i=dt1->u.enumer.nmembs-1, swapped=TRUE; swapped && i>=0; --i) {
                for (j=0, swapped=FALSE; j<i; j++) {
                    if (HDstrcmp(dt1->u.enumer.name[idx1[j]],
                             dt1->u.enumer.name[idx1[j+1]]) > 0) {
                        tmp = idx1[j];
                        idx1[j] = idx1[j+1];
                        idx1[j+1] = tmp;
                        swapped = TRUE;
                    }
                }
            }
            for (i=dt2->u.enumer.nmembs-1, swapped=TRUE; swapped && i>=0; --i) {
                for (j=0, swapped=FALSE; j<i; j++) {
                    if (HDstrcmp(dt2->u.enumer.name[idx2[j]],
                             dt2->u.enumer.name[idx2[j+1]]) > 0) {
                        tmp = idx2[j];
                        idx2[j] = idx2[j+1];
                        idx2[j+1] = tmp;
                        swapped = TRUE;
                    }
                }
            }

#ifdef H5T_DEBUG
            /* I don't quite trust the code above yet :-)  --RPM */
            for (i=0; i<dt1->u.enumer.nmembs-1; i++) {
                assert(HDstrcmp(dt1->u.enumer.name[idx1[i]],
                        dt1->u.enumer.name[idx1[i+1]]));
                assert(HDstrcmp(dt2->u.enumer.name[idx2[i]],
                        dt2->u.enumer.name[idx2[i+1]]));
            }
#endif

            /* Compare the members */
            base_size = dt1->parent->size;
            for (i=0; i<dt1->u.enumer.nmembs; i++) {
                tmp = HDstrcmp(dt1->u.enumer.name[idx1[i]],
                       dt2->u.enumer.name[idx2[i]]);
                if (tmp<0) HGOTO_DONE(-1);
                if (tmp>0) HGOTO_DONE(1);

                tmp = HDmemcmp(dt1->u.enumer.value+idx1[i]*base_size,
                       dt2->u.enumer.value+idx2[i]*base_size,
                       base_size);
                if (tmp<0) HGOTO_DONE(-1);
                if (tmp>0) HGOTO_DONE(1);
            }
            break;

        case H5T_VLEN:
            assert(dt1->u.vlen.type>H5T_VLEN_BADTYPE && dt1->u.vlen.type<H5T_VLEN_MAXTYPE);
            assert(dt2->u.vlen.type>H5T_VLEN_BADTYPE && dt2->u.vlen.type<H5T_VLEN_MAXTYPE);
            assert(dt1->u.vlen.loc>H5T_VLEN_BADLOC && dt1->u.vlen.loc<H5T_VLEN_MAXLOC);
            assert(dt2->u.vlen.loc>H5T_VLEN_BADLOC && dt2->u.vlen.loc<H5T_VLEN_MAXLOC);

            /* Arbitrarily sort sequence VL datatypes before string VL datatypes */
            if (dt1->u.vlen.type==H5T_VLEN_SEQUENCE &&
                    dt2->u.vlen.type==H5T_VLEN_STRING) {
                HGOTO_DONE(-1);
            } else if (dt1->u.vlen.type==H5T_VLEN_STRING &&
                    dt2->u.vlen.type==H5T_VLEN_SEQUENCE) {
                HGOTO_DONE(1);
            }
            /* Arbitrarily sort VL datatypes in memory before disk */
            if (dt1->u.vlen.loc==H5T_VLEN_MEMORY &&
                    dt2->u.vlen.loc==H5T_VLEN_DISK) {
                HGOTO_DONE(-1);
            } else if (dt1->u.vlen.loc==H5T_VLEN_DISK &&
                    dt2->u.vlen.loc==H5T_VLEN_MEMORY) {
                HGOTO_DONE(1);
            }
            /* Don't allow VL types in different files to compare as equal */
            if (dt1->u.vlen.f < dt2->u.vlen.f)
                HGOTO_DONE(-1);
            if (dt1->u.vlen.f > dt2->u.vlen.f)
                HGOTO_DONE(1);
            break;

        case H5T_OPAQUE:
            HGOTO_DONE(HDstrcmp(dt1->u.opaque.tag,dt2->u.opaque.tag));

        case H5T_ARRAY:
            if (dt1->u.array.ndims < dt2->u.array.ndims)
                HGOTO_DONE(-1);
            if (dt1->u.array.ndims > dt2->u.array.ndims)
                HGOTO_DONE(1);

            for (j=0; j<dt1->u.array.ndims; j++) {
                if (dt1->u.array.dim[j] < dt2->u.array.dim[j])
                    HGOTO_DONE(-1);
                if (dt1->u.array.dim[j] > dt2->u.array.dim[j])
                    HGOTO_DONE(1);
            }

            for (j=0; j<dt1->u.array.ndims; j++) {
                if (dt1->u.array.perm[j] < dt2->u.array.perm[j])
                    HGOTO_DONE(-1);
                if (dt1->u.array.perm[j] > dt2->u.array.perm[j])
                    HGOTO_DONE(1);
            }

            tmp = H5T_cmp(dt1->parent, dt2->parent);
            if (tmp < 0)
                HGOTO_DONE(-1);
            if (tmp > 0)
                HGOTO_DONE(1);
            break;

        default:
            /*
             * Atomic datatypes...
             */
            if (dt1->u.atomic.order < dt2->u.atomic.order) HGOTO_DONE(-1);
            if (dt1->u.atomic.order > dt2->u.atomic.order) HGOTO_DONE(1);

            if (dt1->u.atomic.prec < dt2->u.atomic.prec) HGOTO_DONE(-1);
            if (dt1->u.atomic.prec > dt2->u.atomic.prec) HGOTO_DONE(1);

            if (dt1->u.atomic.offset < dt2->u.atomic.offset) HGOTO_DONE(-1);
            if (dt1->u.atomic.offset > dt2->u.atomic.offset) HGOTO_DONE(1);

            if (dt1->u.atomic.lsb_pad < dt2->u.atomic.lsb_pad) HGOTO_DONE(-1);
            if (dt1->u.atomic.lsb_pad > dt2->u.atomic.lsb_pad) HGOTO_DONE(1);

            if (dt1->u.atomic.msb_pad < dt2->u.atomic.msb_pad) HGOTO_DONE(-1);
            if (dt1->u.atomic.msb_pad > dt2->u.atomic.msb_pad) HGOTO_DONE(1);

            switch (dt1->type) {
                case H5T_INTEGER:
                    if (dt1->u.atomic.u.i.sign < dt2->u.atomic.u.i.sign)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.i.sign > dt2->u.atomic.u.i.sign)
                        HGOTO_DONE(1);
                    break;

                case H5T_FLOAT:
                    if (dt1->u.atomic.u.f.sign < dt2->u.atomic.u.f.sign)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.f.sign > dt2->u.atomic.u.f.sign)
                        HGOTO_DONE(1);

                    if (dt1->u.atomic.u.f.epos < dt2->u.atomic.u.f.epos)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.f.epos > dt2->u.atomic.u.f.epos)
                        HGOTO_DONE(1);

                    if (dt1->u.atomic.u.f.esize < dt2->u.atomic.u.f.esize) HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.f.esize > dt2->u.atomic.u.f.esize) HGOTO_DONE(1);

                    if (dt1->u.atomic.u.f.ebias < dt2->u.atomic.u.f.ebias) HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.f.ebias > dt2->u.atomic.u.f.ebias) HGOTO_DONE(1);

                    if (dt1->u.atomic.u.f.mpos < dt2->u.atomic.u.f.mpos)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.f.mpos > dt2->u.atomic.u.f.mpos)
                        HGOTO_DONE(1);

                    if (dt1->u.atomic.u.f.msize < dt2->u.atomic.u.f.msize) HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.f.msize > dt2->u.atomic.u.f.msize) HGOTO_DONE(1);

                    if (dt1->u.atomic.u.f.norm < dt2->u.atomic.u.f.norm)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.f.norm > dt2->u.atomic.u.f.norm)
                        HGOTO_DONE(1);

                    if (dt1->u.atomic.u.f.pad < dt2->u.atomic.u.f.pad)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.f.pad > dt2->u.atomic.u.f.pad)
                        HGOTO_DONE(1);

                    break;

                case H5T_TIME:  /* order and precision are checked above */
                    /*void */
                    break;

                case H5T_STRING:
                    if (dt1->u.atomic.u.s.cset < dt2->u.atomic.u.s.cset)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.s.cset > dt2->u.atomic.u.s.cset)
                        HGOTO_DONE(1);

                    if (dt1->u.atomic.u.s.pad < dt2->u.atomic.u.s.pad)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.s.pad > dt2->u.atomic.u.s.pad)
                        HGOTO_DONE(1);

                    break;

                case H5T_BITFIELD:
                    /*void */
                    break;

                case H5T_REFERENCE:
                    if (dt1->u.atomic.u.r.rtype < dt2->u.atomic.u.r.rtype)
                        HGOTO_DONE(-1);
                    if (dt1->u.atomic.u.r.rtype > dt2->u.atomic.u.r.rtype)
                        HGOTO_DONE(1);

                    switch(dt1->u.atomic.u.r.rtype) {
                        case H5R_OBJECT:
                        case H5R_DATASET_REGION:
                    /* Does this need more to distinguish it? -QAK 11/30/98 */
                            /*void */
                            break;

                        default:
                            assert("not implemented yet" && 0);
                    }
                    break;

                default:
                    assert("not implemented yet" && 0);
            }
        break;
    } /* end switch */

done:
    if(idx1!=NULL)
        H5MM_xfree(idx1);
    if(idx2!=NULL)
        H5MM_xfree(idx2);

    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_path_find
 *
 * Purpose: Finds the path which converts type SRC_ID to type DST_ID,
 *          creating a new path if necessary.  If FUNC is non-zero then
 *          it is set as the hard conversion function for that path
 *          regardless of whether the path previously existed. Changing
 *          the conversion function of a path causes statistics to be
 *          reset to zero after printing them.  The NAME is used only
 *          when creating a new path and is just for debugging.
 *
 *          If SRC and DST are both null pointers then the special no-op
 *          conversion path is used.  This path is always stored as the
 *          first path in the path table.
 *
 * Return:  Success:    Pointer to the path, valid until the path
 *                      database is modified.
 *
 *          Failure:    NULL if the path does not exist and no
 *                      function can be found to apply to the new
 *                      path.
 *
 * Programmer:    Robb Matzke
 *          Tuesday, January 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_path_t *
H5T_path_find(const H5T_t *src, const H5T_t *dst, const char *name,
            H5T_conv_t func, hid_t dxpl_id)
{
    int     lt, rt;                 /*left and right edges        */
    int     md;               /*middle                */
    int     cmp;              /*comparison result           */
    int old_npaths;             /* Previous number of paths in table */
    H5T_path_t    *table=NULL;            /*path existing in the table  */
    H5T_path_t    *path=NULL;       /*new path              */
    H5T_path_t    *ret_value; /*return value                */
    hid_t   src_id=-1, dst_id=-1;   /*src and dst type identifiers      */
    int     i;                /*counter               */
    int     nprint=0;         /*lines of output printed     */

    FUNC_ENTER_NOAPI(H5T_path_find, NULL);

    assert((!src && !dst) || (src && dst));

    /*
     * Make sure the first entry in the table is the no-op conversion path.
     */
    if (0==H5T_g.npaths) {
      if (NULL==(H5T_g.path=H5MM_malloc(128*sizeof(H5T_path_t*))))
          HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for type conversion path table");
      H5T_g.apaths = 128;
      if (NULL==(H5T_g.path[0]=H5FL_CALLOC(H5T_path_t)))
          HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for no-op conversion path");
      HDstrcpy(H5T_g.path[0]->name, "no-op");
      H5T_g.path[0]->func = H5T_conv_noop;
      H5T_g.path[0]->cdata.command = H5T_CONV_INIT;
      if (H5T_conv_noop(FAIL, FAIL, &(H5T_g.path[0]->cdata), (hsize_t)0, 0, 0,
                    NULL, NULL, dxpl_id)<0) {
#ifdef H5T_DEBUG
          if (H5DEBUG(T)) {
            fprintf(H5DEBUG(T), "H5T: unable to initialize no-op "
                  "conversion function (ignored)\n");
          }
#endif
          H5E_clear(); /*ignore the error*/
      }
      H5T_g.npaths = 1;
    }

    /*
     * Find the conversion path.  If source and destination types are equal
     * then use entry[0], otherwise do a binary search over the
     * remaining entries.
     *
     * Quincey Koziol, 2 July, 1999
     * Only allow the no-op conversion to occur if no "force conversion" flags
     * are set
     */
    if (src->force_conv==FALSE && dst->force_conv==FALSE && 0==H5T_cmp(src, dst)) {
      table = H5T_g.path[0];
      cmp = 0;
      md = 0;
    } else {
      lt = md = 1;
      rt = H5T_g.npaths;
      cmp = -1;
      
      while (cmp && lt<rt) {
          md = (lt+rt) / 2;
          assert(H5T_g.path[md]);
          cmp = H5T_cmp(src, H5T_g.path[md]->src);
          if (0==cmp) cmp = H5T_cmp(dst, H5T_g.path[md]->dst);
          if (cmp<0) {
            rt = md;
          } else if (cmp>0) {
            lt = md+1;
          } else {
            table = H5T_g.path[md];
          }
      }
    }

    /* Keep a record of the number of paths in the table, in case one of the
     * initialization calls below (hard or soft) causes more entries to be
     * added to the table - QAK, 1/26/02
     */
    old_npaths=H5T_g.npaths;
    
    /*
     * If we didn't find the path or if the caller is specifying a new hard
     * conversion function then create a new path and add the new function to
     * the path.
     */
    if (!table || func) {
      if (NULL==(path=H5FL_CALLOC(H5T_path_t)))
          HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for type conversion path");
      if (name && *name) {
          HDstrncpy(path->name, name, H5T_NAMELEN);
          path->name[H5T_NAMELEN-1] = '\0';
      } else {
          HDstrcpy(path->name, "NONAME");
      }
      if ((src && NULL==(path->src=H5T_copy(src, H5T_COPY_ALL))) ||
                (dst && NULL==(path->dst=H5T_copy(dst, H5T_COPY_ALL))))
          HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to copy data type for conversion path");
    } else {
      path = table;
    }

    /*
     * If a hard conversion function is specified and none is defined for the
     * path then add it to the path and initialize its conversion data.
     */
    if (func) {
      assert(path!=table);
      assert(NULL==path->func);
      if (path->src && (src_id=H5I_register(H5I_DATATYPE,
                  H5T_copy(path->src, H5T_COPY_ALL)))<0)
          HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, NULL, "unable to register source conversion type for query");
      if (path->dst && (dst_id=H5I_register(H5I_DATATYPE,
                  H5T_copy(path->dst, H5T_COPY_ALL)))<0)
          HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, NULL, "unable to register destination conversion type for query");
      path->cdata.command = H5T_CONV_INIT;
      if ((func)(src_id, dst_id, &(path->cdata), (hsize_t)0, 0, 0, NULL, NULL,
                   dxpl_id)<0)
          HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to initialize conversion function");
      if (src_id>=0) H5I_dec_ref(src_id);
      if (dst_id>=0) H5I_dec_ref(dst_id);
      src_id = dst_id = -1;
      path->func = func;
      path->is_hard = TRUE;
    }
    
    /*
     * If the path doesn't have a function by now (because it's a new path
     * and the caller didn't supply a hard function) then scan the soft list
     * for an applicable function and add it to the path.  This can't happen
     * for the no-op conversion path.
     */
    assert(path->func || (src && dst));
    for (i=H5T_g.nsoft-1; i>=0 && !path->func; --i) {
      if (src->type!=H5T_g.soft[i].src ||
          dst->type!=H5T_g.soft[i].dst) {
          continue;
      }
      if ((src_id=H5I_register(H5I_DATATYPE,
                         H5T_copy(path->src, H5T_COPY_ALL)))<0 ||
                (dst_id=H5I_register(H5I_DATATYPE,
                         H5T_copy(path->dst, H5T_COPY_ALL)))<0)
          HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, NULL, "unable to register conversion types for query");
      path->cdata.command = H5T_CONV_INIT;
      if ((H5T_g.soft[i].func) (src_id, dst_id, &(path->cdata),
                                  (hsize_t)0, 0, 0, NULL, NULL, dxpl_id)<0) {
          HDmemset (&(path->cdata), 0, sizeof(H5T_cdata_t));
          H5E_clear(); /*ignore the error*/
      } else {
          HDstrcpy (path->name, H5T_g.soft[i].name);
          path->func = H5T_g.soft[i].func;
          path->is_hard = FALSE;
      }
      H5I_dec_ref(src_id);
      H5I_dec_ref(dst_id);
      src_id = dst_id = -1;
    }
    if (!path->func)
      HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "no appropriate function for conversion path");

    /* Check if paths were inserted into the table through a recursive call
     * and re-compute the correct location for this path if so. - QAK, 1/26/02
     */
    if(old_npaths!=H5T_g.npaths) {
        lt = md = 1;
        rt = H5T_g.npaths;
        cmp = -1;
        
        while (cmp && lt<rt) {
            md = (lt+rt) / 2;
            assert(H5T_g.path[md]);
            cmp = H5T_cmp(src, H5T_g.path[md]->src);
            if (0==cmp) cmp = H5T_cmp(dst, H5T_g.path[md]->dst);
            if (cmp<0) {
                rt = md;
            } else if (cmp>0) {
                lt = md+1;
            } else {
                table = H5T_g.path[md];
            }
        }
    } /* end if */

    /* Replace an existing table entry or add a new entry */
    if (table && path!=table) {
      assert(table==H5T_g.path[md]);
      H5T_print_stats(table, &nprint/*in,out*/);
      table->cdata.command = H5T_CONV_FREE;
      if ((table->func)(FAIL, FAIL, &(table->cdata), (hsize_t)0, 0, 0, NULL, NULL,
                          dxpl_id)<0) {
#ifdef H5T_DEBUG
          if (H5DEBUG(T)) {
            fprintf(H5DEBUG(T), "H5T: conversion function 0x%08lx free "
                  "failed for %s (ignored)\n",
                  (unsigned long)(path->func), path->name);
          }
#endif
          H5E_clear(); /*ignore the failure*/
      }
      if (table->src) H5T_close(table->src);
      if (table->dst) H5T_close(table->dst);
        H5FL_FREE(H5T_path_t,table);
      table = path;
      H5T_g.path[md] = path;
    } else if (path!=table) {
      assert(cmp);
        if (H5T_g.npaths >= H5T_g.apaths) {
            size_t na = MAX(128, 2 * H5T_g.apaths);
            H5T_path_t **x = H5MM_realloc (H5T_g.path,
                                 na*sizeof(H5T_path_t*));
            if (!x)
            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
            H5T_g.apaths = (int)na;
            H5T_g.path = x;
        }
        if (cmp>0) md++;
        HDmemmove(H5T_g.path+md+1, H5T_g.path+md,
              (H5T_g.npaths-md) * sizeof(H5T_path_t*));
        H5T_g.npaths++;
      H5T_g.path[md] = path;
      table = path;
    }

    /* Set return value */
    ret_value = path;

done:
    if (!ret_value && path && path!=table) {
      if (path->src) H5T_close(path->src);
      if (path->dst) H5T_close(path->dst);
        H5FL_FREE(H5T_path_t,path);
    }
    if (src_id>=0) H5I_dec_ref(src_id);
    if (dst_id>=0) H5I_dec_ref(dst_id);
    
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_path_noop
 *
 * Purpose: Is the path the special no-op path? The no-op function can be
 *              set by the application and there might be more than one no-op
 *              path in a multi-threaded application if one thread is using
 *              the no-op path when some other thread changes its definition.
 *
 * Return:  TRUE/FALSE (can't fail)
 *
 * Programmer:    Quincey Koziol
 *          Thursday, May  8, 2003
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5T_path_noop(const H5T_path_t *p)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_path_noop);

    assert(p);

    FUNC_LEAVE_NOAPI(p->is_hard && 0==H5T_cmp(p->src, p->dst));
} /* end H5T_path_noop() */


/*-------------------------------------------------------------------------
 * Function:      H5T_path_bkg
 *
 * Purpose: Get the "background" flag for the conversion path.
 *
 * Return:  Background flag (can't fail)
 *
 * Programmer:    Quincey Koziol
 *          Thursday, May  8, 2003
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_bkg_t
H5T_path_bkg(const H5T_path_t *p)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_path_bkg);

    assert(p);

    FUNC_LEAVE_NOAPI(p->cdata.need_bkg);
} /* end H5T_path_bkg() */


/*-------------------------------------------------------------------------
 * Function:      H5T_convert
 *
 * Purpose: Call a conversion function to convert from source to
 *          destination data type and accumulate timing statistics.
 *
 * Return:  Success:    non-negative
 *
 *          Failure:    negative
 *
 * Programmer:    Robb Matzke
 *              Tuesday, December 15, 1998
 *
 * Modifications:
 *          Robb Matzke, 1999-06-16
 *          The timers are updated only if H5T debugging is enabled at
 *          runtime in addition to compile time.
 *
 *          Robb Matzke, 1999-06-16
 *          Added support for non-zero strides. If BUF_STRIDE is non-zero
 *          then convert one value at each memory location advancing
 *          BUF_STRIDE bytes each time; otherwise assume both source and
 *          destination values are packed.
 *
 *              Quincey Koziol, 1999-07-01
 *              Added dataset transfer properties, to allow custom VL
 *              datatype allocation function to be passed down to VL
 *              conversion routine.
 *
 *              Robb Matzke, 2000-05-17
 *              Added the BKG_STRIDE argument which gets passed to all the
 *              conversion functions. If BUF_STRIDE is non-zero then each
 *              data element is at a multiple of BUF_STRIDE bytes in BUF
 *              (on both input and output). If BKG_STRIDE is also set then
 *              the BKG buffer is used in such a way that temporary space
 *              for each element is aligned on a BKG_STRIDE byte boundary.
 *              If either BUF_STRIDE or BKG_STRIDE are zero then the BKG
 *              buffer will be accessed as though it were a packed array
 *              of destination datatype.
 *-------------------------------------------------------------------------
 */
herr_t
H5T_convert(H5T_path_t *tpath, hid_t src_id, hid_t dst_id, hsize_t nelmts,
          size_t buf_stride, size_t bkg_stride, void *buf, void *bkg,
            hid_t dset_xfer_plist)
{
#ifdef H5T_DEBUG
    H5_timer_t          timer;
#endif
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5T_convert, FAIL);

#ifdef H5T_DEBUG
    if (H5DEBUG(T)) H5_timer_begin(&timer);
#endif
    tpath->cdata.command = H5T_CONV_CONV;
    if ((tpath->func)(src_id, dst_id, &(tpath->cdata), nelmts, buf_stride,
                      bkg_stride, buf, bkg, dset_xfer_plist)<0)
      HGOTO_ERROR(H5E_ATTR, H5E_CANTENCODE, FAIL, "data type conversion failed");
#ifdef H5T_DEBUG
    if (H5DEBUG(T)) {
      H5_timer_end(&(tpath->stats.timer), &timer);
      tpath->stats.ncalls++;
      tpath->stats.nelmts += nelmts;
    }
#endif

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_entof
 *
 * Purpose: Returns a pointer to the entry for a named data type.
 *
 * Return:  Success:    Ptr directly into named data type
 *
 *          Failure:    NULL
 *
 * Programmer:    Robb Matzke
 *              Friday, June  5, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5G_entry_t *
H5T_entof (H5T_t *dt)
{
    H5G_entry_t         *ret_value = NULL;
    
    FUNC_ENTER_NOAPI(H5T_entof, NULL);

    assert (dt);

    switch (dt->state) {
        case H5T_STATE_TRANSIENT:
        case H5T_STATE_RDONLY:
        case H5T_STATE_IMMUTABLE:
            HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, NULL, "not a named data type");
        case H5T_STATE_NAMED:
        case H5T_STATE_OPEN:
            ret_value = &(dt->ent);
            break;
    }

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:    H5T_is_immutable
 *
 * Purpose:     Check if a datatype is immutable. 
 *
 * Return:      TRUE 
 *
 *              FALSE 
 *
 * Programmer:  Raymond Lu 
 *              Friday, Dec 7, 2001 
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5T_is_immutable(H5T_t *dt)
{
    htri_t ret_value = FALSE;

    FUNC_ENTER_NOAPI(H5T_is_immutable, FAIL);

    assert(dt);

    if(dt->state == H5T_STATE_IMMUTABLE)
        ret_value = TRUE;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:    H5T_is_named
 *
 * Purpose:     Check if a datatype is named. 
 *
 * Return:      TRUE 
 *
 *              FALSE 
 *
 * Programmer:  Pedro Vicente 
 *              Tuesday, Sep 3, 2002
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5T_is_named(H5T_t *dt)
{
    htri_t ret_value = FALSE;

    FUNC_ENTER_NOAPI(H5T_is_named, FAIL);

    assert(dt);

    if(dt->state == H5T_STATE_OPEN || dt->state == H5T_STATE_NAMED)
        ret_value = TRUE;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*--------------------------------------------------------------------------
 NAME
    H5T_get_ref_type
 PURPOSE
    Retrieves the type of reference for a datatype
 USAGE
    H5R_type_t H5Tget_ref_type(dt)
        H5T_t *dt;  IN: datatype pointer for the reference datatype
        
 RETURNS
    Success:      A reference type defined in H5Rpublic.h
    Failure:      H5R_BADTYPE
 DESCRIPTION
    Given a reference datatype object, this function returns the reference type
        of the datatype.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
H5R_type_t
H5T_get_ref_type(const H5T_t *dt)
{
    H5R_type_t ret_value = H5R_BADTYPE;

    FUNC_ENTER_NOAPI(H5T_get_ref_type, H5R_BADTYPE);

    assert(dt);

    if(dt->type==H5T_REFERENCE)
        ret_value=dt->u.atomic.u.r.rtype;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}   /* end H5T_get_ref_type() */


/*-------------------------------------------------------------------------
 * Function:      H5T_is_sensible
 *
 * Purpose: Determines if a data type is sensible to store on disk
 *              (i.e. not partially initialized)
 *
 * Return:  Success:    TRUE, FALSE
 *
 *          Failure:    Negative
 *
 * Programmer:    Quincey Koziol
 *          Tuesday, June 11, 2002
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5T_is_sensible(const H5T_t *dt)
{
    htri_t  ret_value;
    
    FUNC_ENTER_NOAPI(H5T_is_sensible, FAIL);

    assert(dt);

    switch(dt->type) {
        case H5T_COMPOUND:
            /* Only allow compound datatypes with at least one member to be stored on disk */
            if(dt->u.compnd.nmembs > 0)
                ret_value=TRUE;
            else
                ret_value=FALSE;
            break;

        case H5T_ENUM:
            /* Only allow enum datatypes with at least one member to be stored on disk */
            if(dt->u.enumer.nmembs > 0)
                ret_value=TRUE;
            else
                ret_value=FALSE;
            break;

        default:
            /* Assume all other datatype are sensible to store on disk */
            ret_value=TRUE;
            break;
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5T_print_stats
 *
 * Purpose: Print statistics about a conversion path.  Statistics are
 *          printed only if all the following conditions are true:
 *
 *          1. The library was compiled with H5T_DEBUG defined.
 *          2. Data type debugging is turned on at run time.
 *          3. The path was called at least one time.
 *
 *          The optional NPRINT argument keeps track of the number of
 *          conversions paths for which statistics have been shown. If
 *          its value is zero then table headers are printed before the
 *          first line of output.
 *
 * Return:  Success:    non-negative
 *
 *          Failure:    negative
 *
 * Programmer:    Robb Matzke
 *              Monday, December 14, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_print_stats(H5T_path_t UNUSED * path, int UNUSED * nprint/*in,out*/)
{
#ifdef H5T_DEBUG
    hsize_t nbytes;
    char    bandwidth[32];
#endif

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_print_stats);
    
#ifdef H5T_DEBUG
    if (H5DEBUG(T) && path->stats.ncalls>0) {
      if (nprint && 0==(*nprint)++) {
          HDfprintf (H5DEBUG(T), "H5T: type conversion statistics:\n");
          HDfprintf (H5DEBUG(T), "   %-16s %10s %10s %8s %8s %8s %10s\n",
                   "Conversion", "Elmts", "Calls", "User",
                   "System", "Elapsed", "Bandwidth");
          HDfprintf (H5DEBUG(T), "   %-16s %10s %10s %8s %8s %8s %10s\n",
                   "----------", "-----", "-----", "----",
                   "------", "-------", "---------");
      }
      nbytes = MAX (H5T_get_size (path->src),
                  H5T_get_size (path->dst));
      nbytes *= path->stats.nelmts;
      H5_bandwidth(bandwidth, (double)nbytes,
                 path->stats.timer.etime);
      HDfprintf (H5DEBUG(T), "   %-16s %10Hd %10d %8.2f %8.2f %8.2f %10s\n",
               path->name,
               path->stats.nelmts,
               path->stats.ncalls,
               path->stats.timer.utime, 
               path->stats.timer.stime, 
               path->stats.timer.etime,
               bandwidth);
    }
#endif
    FUNC_LEAVE_NOAPI(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:      H5T_debug
 *
 * Purpose: Prints information about a data type.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_debug(const H5T_t *dt, FILE *stream)
{
    const char    *s1="", *s2="";
    int           i;
    size_t  k, base_size;
    uint64_t      tmp;
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5T_debug, FAIL);

    /* Check args */
    assert(dt);
    assert(stream);

    switch (dt->type) {
        case H5T_INTEGER:
            s1 = "int";
            break;
        case H5T_FLOAT:
            s1 = "float";
            break;
        case H5T_TIME:
            s1 = "time";
            break;
        case H5T_STRING:
            s1 = "str";
            break;
        case H5T_BITFIELD:
            s1 = "bits";
            break;
        case H5T_OPAQUE:
            s1 = "opaque";
            break;
        case H5T_COMPOUND:
            s1 = "struct";
            break;
        case H5T_ENUM:
            s1 = "enum";
            break;
        default:
            s1 = "";
            break;
    }

    switch (dt->state) {
        case H5T_STATE_TRANSIENT:
            s2 = "[transient]";
            break;
        case H5T_STATE_RDONLY:
            s2 = "[constant]";
            break;
        case H5T_STATE_IMMUTABLE:
            s2 = "[predefined]";
            break;
        case H5T_STATE_NAMED:
            s2 = "[named,closed]";
            break;
        case H5T_STATE_OPEN:
            s2 = "[named,open]";
            break;
    }

    fprintf(stream, "%s%s {nbytes=%lu", s1, s2, (unsigned long)(dt->size));

    if (H5T_is_atomic(dt)) {
      switch (dt->u.atomic.order) {
            case H5T_ORDER_BE:
                s1 = "BE";
                break;
            case H5T_ORDER_LE:
                s1 = "LE";
                break;
            case H5T_ORDER_VAX:
                s1 = "VAX";
                break;
            case H5T_ORDER_NONE:
                s1 = "NONE";
                break;
            default:
                s1 = "order?";
                break;
      }
      fprintf(stream, ", %s", s1);

      if (dt->u.atomic.offset) {
          fprintf(stream, ", offset=%lu",
                (unsigned long) (dt->u.atomic.offset));
      }
      if (dt->u.atomic.prec != 8 * dt->size) {
          fprintf(stream, ", prec=%lu",
                (unsigned long) (dt->u.atomic.prec));
      }
      switch (dt->type) {
            case H5T_INTEGER:
                switch (dt->u.atomic.u.i.sign) {
                    case H5T_SGN_NONE:
                        s1 = "unsigned";
                        break;
                    case H5T_SGN_2:
                        s1 = NULL;
                        break;
                    default:
                        s1 = "sign?";
                        break;
                }
                if (s1) fprintf(stream, ", %s", s1);
                break;

            case H5T_FLOAT:
                switch (dt->u.atomic.u.f.norm) {
                    case H5T_NORM_IMPLIED:
                        s1 = "implied";
                        break;
                    case H5T_NORM_MSBSET:
                        s1 = "msbset";
                        break;
                    case H5T_NORM_NONE:
                        s1 = "no-norm";
                        break;
                    default:
                        s1 = "norm?";
                        break;
                }
                fprintf(stream, ", sign=%lu+1",
                        (unsigned long) (dt->u.atomic.u.f.sign));
                fprintf(stream, ", mant=%lu+%lu (%s)",
                        (unsigned long) (dt->u.atomic.u.f.mpos),
                        (unsigned long) (dt->u.atomic.u.f.msize), s1);
                fprintf(stream, ", exp=%lu+%lu",
                        (unsigned long) (dt->u.atomic.u.f.epos),
                        (unsigned long) (dt->u.atomic.u.f.esize));
                tmp = dt->u.atomic.u.f.ebias >> 32;
                if (tmp) {
                    size_t hi=(size_t)tmp;
                    size_t lo =(size_t)(dt->u.atomic.u.f.ebias & 0xffffffff);
                    fprintf(stream, " bias=0x%08lx%08lx",
                            (unsigned long)hi, (unsigned long)lo);
                } else {
                    size_t lo = (size_t)(dt->u.atomic.u.f.ebias & 0xffffffff);
                    fprintf(stream, " bias=0x%08lx", (unsigned long)lo);
                }
                break;

            default:
                /* No additional info */
                break;
      }
      
    } else if (H5T_COMPOUND==dt->type) {
      /* Compound data type */
      for (i=0; i<dt->u.compnd.nmembs; i++) {
          fprintf(stream, "\n\"%s\" @%lu",
                dt->u.compnd.memb[i].name,
                (unsigned long) (dt->u.compnd.memb[i].offset));
#ifdef OLD_WAY
          if (dt->u.compnd.memb[i].ndims) {
            fprintf(stream, "[");
            for (j = 0; j < dt->u.compnd.memb[i].ndims; j++) {
                fprintf(stream, "%s%lu", j ? ", " : "",
                      (unsigned long)(dt->u.compnd.memb[i].dim[j]));
            }
            fprintf(stream, "]");
          }
#endif /* OLD_WAY */
          fprintf(stream, " ");
          H5T_debug(dt->u.compnd.memb[i].type, stream);
      }
      fprintf(stream, "\n");
      
    } else if (H5T_ENUM==dt->type) {
      /* Enumeration data type */
      fprintf(stream, " ");
      H5T_debug(dt->parent, stream);
      base_size = dt->parent->size;
      for (i=0; i<dt->u.enumer.nmembs; i++) {
          fprintf(stream, "\n\"%s\" = 0x", dt->u.enumer.name[i]);
          for (k=0; k<base_size; k++) {
            fprintf(stream, "%02lx",
                  (unsigned long)(dt->u.enumer.value+i*base_size+k));
          }
      }
      fprintf(stream, "\n");
      
    } else if (H5T_OPAQUE==dt->type) {
      fprintf(stream, ", tag=\"%s\"", dt->u.opaque.tag);

    } else {
      /* Unknown */
      fprintf(stream, "unknown class %d\n", (int)(dt->type));
    }
    fprintf(stream, "}");

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


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