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H5LT.c
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H5LT.c
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* 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 COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* [email protected]. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "H5LTprivate.h"
/* For Lex and Yacc */
#define COL 3
#define LIMIT 512
#define INCREMENT 1024
#define TMP_LEN 256
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
size_t input_len;
char *myinput;
size_t indent = 0;
/* File Image operations
A file image is a representation of an HDF5 file in a memory
buffer. In order to perform operations on an image in a similar way
to a file, the application buffer is copied to a FAPL buffer, which
in turn is copied to a VFD buffer. Buffer copying can decrease
performance, especially when using large file images. A solution to
this issue is to simulate the copying of the application buffer,
when actually the same buffer is used for the FAPL and the VFD.
This is implemented by using callbacks that simulate the standard
functions for memory management (additional callbacks are used for
the management of associated data structures). From the application
standpoint, a file handle can be obtained from a file image by using
the API routine H5LTopen_file_image(). This function takes a flag
argument that indicates the HDF5 library how to handle the given image;
several flag values can be combined by using the bitwise OR operator.
Valid flag values include:
H5LT_FILE_IMAGE_OPEN_RW indicates the HDF5 library to open the file
image in read/write mode. Default is read-only mode.
H5LT_FILE_IMAGE_DONT_COPY indicates the HDF5 library to not copy the
supplied user buffer; the same buffer will be handled by the FAPL and
the VFD driver. Default operation copies the user buffer to the FAPL and
VFD driver.
H5LT_FILE_IMAGE_DONT_RELEASE indicates the HDF5 library to not release
the buffer handled by the FAPL and the VFD upon closing. This flag value
is only applicable when the flag value H5LT_FILE_IMAGE_DONT_COPY is set as
well. The application is responsible to release the image buffer.
*/
/* Data structure to pass application data to callbacks. */
typedef struct {
void *app_image_ptr; /* Pointer to application buffer */
size_t app_image_size; /* Size of application buffer */
void *fapl_image_ptr; /* Pointer to FAPL buffer */
size_t fapl_image_size; /* Size of FAPL buffer */
int fapl_ref_count; /* Reference counter for FAPL buffer */
void *vfd_image_ptr; /* Pointer to VFD buffer */
size_t vfd_image_size; /* Size of VFD buffer */
int vfd_ref_count; /* Reference counter for VFD buffer */
unsigned flags; /* Flags indicate how the file image will */
/* be open */
int ref_count; /* Reference counter on udata struct */
} H5LT_file_image_ud_t;
/* callbacks prototypes for file image ops */
static void *image_malloc(size_t size, H5FD_file_image_op_t file_image_op, void *udata);
static void *image_memcpy(void *dest, const void *src, size_t size, H5FD_file_image_op_t file_image_op,
void *udata);
static void *image_realloc(void *ptr, size_t size, H5FD_file_image_op_t file_image_op, void *udata);
static herr_t image_free(void *ptr, H5FD_file_image_op_t file_image_op, void *udata);
static void *udata_copy(void *udata);
static herr_t udata_free(void *udata);
/* Definition of callbacks for file image operations. */
/*-------------------------------------------------------------------------
* Function: image_malloc
*
* Purpose: Simulates malloc() function to avoid copying file images.
* The application buffer is set to the buffer on only one FAPL.
* Then the FAPL buffer can be copied to other FAPL buffers or
* to only one VFD buffer.
*
* Return: Address of "allocated" buffer, if successful. Otherwise, it returns
* NULL.
*
*-------------------------------------------------------------------------
*/
static void *
image_malloc(size_t size, H5FD_file_image_op_t file_image_op, void *_udata)
{
H5LT_file_image_ud_t *udata = (H5LT_file_image_ud_t *)_udata;
void *return_value = NULL;
/* callback is only used if the application buffer is not actually copied */
if (!(udata->flags & H5LT_FILE_IMAGE_DONT_COPY))
goto out;
switch (file_image_op) {
/* the app buffer is "copied" to only one FAPL. Afterwards, FAPLs can be "copied" */
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_SET:
if (udata->app_image_ptr == NULL)
goto out;
if (udata->app_image_size != size)
goto out;
if (udata->fapl_image_ptr != NULL)
goto out;
if (udata->fapl_image_size != 0)
goto out;
if (udata->fapl_ref_count != 0)
goto out;
udata->fapl_image_ptr = udata->app_image_ptr;
udata->fapl_image_size = udata->app_image_size;
return_value = udata->fapl_image_ptr;
udata->fapl_ref_count++;
break;
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_COPY:
if (udata->fapl_image_ptr == NULL)
goto out;
if (udata->fapl_image_size != size)
goto out;
if (udata->fapl_ref_count == 0)
goto out;
return_value = udata->fapl_image_ptr;
udata->fapl_ref_count++;
break;
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_GET:
goto out;
case H5FD_FILE_IMAGE_OP_FILE_OPEN:
/* FAPL buffer is "copied" to only one VFD buffer */
if (udata->vfd_image_ptr != NULL)
goto out;
if (udata->vfd_image_size != 0)
goto out;
if (udata->vfd_ref_count != 0)
goto out;
if (udata->fapl_image_ptr == NULL)
goto out;
if (udata->fapl_image_size != size)
goto out;
if (udata->fapl_ref_count == 0)
goto out;
udata->vfd_image_ptr = udata->fapl_image_ptr;
udata->vfd_image_size = size;
udata->vfd_ref_count++;
return_value = udata->vfd_image_ptr;
break;
/* added unused labels to shut the compiler up */
case H5FD_FILE_IMAGE_OP_NO_OP:
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_CLOSE:
case H5FD_FILE_IMAGE_OP_FILE_RESIZE:
case H5FD_FILE_IMAGE_OP_FILE_CLOSE:
default:
goto out;
} /* end switch */
return (return_value);
out:
return NULL;
} /* end image_malloc() */
/*-------------------------------------------------------------------------
* Function: image_memcpy
*
* Purpose: Simulates memcpy() function to avoid copying file images.
* The image buffer can be set to only one FAPL buffer, and
* "copied" to only one VFD buffer. The FAPL buffer can be
* "copied" to other FAPLs buffers.
*
* Return: The address of the destination buffer, if successful. Otherwise, it
* returns NULL.
*
*-------------------------------------------------------------------------
*/
static void *
image_memcpy(void *dest, const void *src, size_t size, H5FD_file_image_op_t file_image_op, void *_udata)
{
H5LT_file_image_ud_t *udata = (H5LT_file_image_ud_t *)_udata;
/* callback is only used if the application buffer is not actually copied */
if (!(udata->flags & H5LT_FILE_IMAGE_DONT_COPY))
goto out;
switch (file_image_op) {
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_SET:
if (dest != udata->fapl_image_ptr)
goto out;
if (src != udata->app_image_ptr)
goto out;
if (size != udata->fapl_image_size)
goto out;
if (size != udata->app_image_size)
goto out;
if (udata->fapl_ref_count == 0)
goto out;
break;
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_COPY:
if (dest != udata->fapl_image_ptr)
goto out;
if (src != udata->fapl_image_ptr)
goto out;
if (size != udata->fapl_image_size)
goto out;
if (udata->fapl_ref_count < 2)
goto out;
break;
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_GET:
goto out;
case H5FD_FILE_IMAGE_OP_FILE_OPEN:
if (dest != udata->vfd_image_ptr)
goto out;
if (src != udata->fapl_image_ptr)
goto out;
if (size != udata->vfd_image_size)
goto out;
if (size != udata->fapl_image_size)
goto out;
if (udata->fapl_ref_count == 0)
goto out;
if (udata->vfd_ref_count != 1)
goto out;
break;
/* added unused labels to shut the compiler up */
case H5FD_FILE_IMAGE_OP_NO_OP:
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_CLOSE:
case H5FD_FILE_IMAGE_OP_FILE_RESIZE:
case H5FD_FILE_IMAGE_OP_FILE_CLOSE:
default:
goto out;
} /* end switch */
return (dest);
out:
return NULL;
} /* end image_memcpy() */
/*-------------------------------------------------------------------------
* Function: image_realloc
*
* Purpose: Reallocates the shared application image buffer and updates data
* structures that manage buffer "copying".
*
* Return: Address of reallocated buffer, if successful. Otherwise, it returns
* NULL.
*
*-------------------------------------------------------------------------
*/
static void *
image_realloc(void *ptr, size_t size, H5FD_file_image_op_t file_image_op, void *_udata)
{
H5LT_file_image_ud_t *udata = (H5LT_file_image_ud_t *)_udata;
void *return_value = NULL;
/* callback is only used if the application buffer is not actually copied */
if (!(udata->flags & H5LT_FILE_IMAGE_DONT_COPY))
goto out;
/* realloc() is not allowed when the HDF5 library won't release the image
buffer because reallocation may change the address of the buffer. The
new address cannot be communicated to the application to release it. */
if (udata->flags & H5LT_FILE_IMAGE_DONT_RELEASE)
goto out;
/* realloc() is not allowed if the image is open in read-only mode */
if (!(udata->flags & H5LT_FILE_IMAGE_OPEN_RW))
goto out;
if (file_image_op == H5FD_FILE_IMAGE_OP_FILE_RESIZE) {
void *tmp_realloc;
if (udata->vfd_image_ptr != ptr)
goto out;
if (udata->vfd_ref_count != 1)
goto out;
/* Make sure all the udata structure image pointers
* match each other before we update them
*/
assert(udata->vfd_image_ptr == udata->app_image_ptr);
assert(udata->vfd_image_ptr == udata->fapl_image_ptr);
tmp_realloc = realloc(ptr, size);
if (tmp_realloc) {
udata->vfd_image_ptr = tmp_realloc;
udata->app_image_ptr = udata->vfd_image_ptr;
udata->fapl_image_ptr = udata->vfd_image_ptr;
}
else {
free(ptr);
udata->vfd_image_ptr = NULL;
udata->app_image_ptr = NULL;
udata->fapl_image_ptr = NULL;
goto out;
}
udata->vfd_image_size = size;
return_value = udata->vfd_image_ptr;
} /* end if */
else
goto out;
return (return_value);
out:
return NULL;
} /* end image_realloc() */
/*-------------------------------------------------------------------------
* Function: image_free
*
* Purpose: Simulates deallocation of FAPL and VFD buffers by decreasing
* reference counters. Shared application buffer is actually
* deallocated if there are no outstanding references.
*
* Return: SUCCEED or FAIL
*
*-------------------------------------------------------------------------
*/
static herr_t
image_free(void *ptr, H5FD_file_image_op_t file_image_op, void *_udata)
{
H5LT_file_image_ud_t *udata = (H5LT_file_image_ud_t *)_udata;
/* callback is only used if the application buffer is not actually copied */
if (!(udata->flags & H5LT_FILE_IMAGE_DONT_COPY))
goto out;
switch (file_image_op) {
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_CLOSE:
if (udata->fapl_image_ptr != ptr)
goto out;
if (udata->fapl_ref_count == 0)
goto out;
udata->fapl_ref_count--;
/* release the shared buffer only if indicated by the respective flag and there are no outstanding
* references */
if (udata->fapl_ref_count == 0 && udata->vfd_ref_count == 0 &&
!(udata->flags & H5LT_FILE_IMAGE_DONT_RELEASE)) {
free(udata->fapl_image_ptr);
udata->app_image_ptr = NULL;
udata->fapl_image_ptr = NULL;
udata->vfd_image_ptr = NULL;
} /* end if */
break;
case H5FD_FILE_IMAGE_OP_FILE_CLOSE:
if (udata->vfd_image_ptr != ptr)
goto out;
if (udata->vfd_ref_count != 1)
goto out;
udata->vfd_ref_count--;
/* release the shared buffer only if indicated by the respective flag and there are no outstanding
* references */
if (udata->fapl_ref_count == 0 && udata->vfd_ref_count == 0 &&
!(udata->flags & H5LT_FILE_IMAGE_DONT_RELEASE)) {
/* Make sure we aren't going to leak memory elsewhere */
assert(udata->app_image_ptr == udata->vfd_image_ptr || udata->app_image_ptr == NULL);
assert(udata->fapl_image_ptr == udata->vfd_image_ptr || udata->fapl_image_ptr == NULL);
free(udata->vfd_image_ptr);
udata->app_image_ptr = NULL;
udata->fapl_image_ptr = NULL;
udata->vfd_image_ptr = NULL;
}
/* release reference to udata structure */
if (udata_free(udata) < 0)
goto out;
break;
/* added unused labels to keep the compiler quite */
case H5FD_FILE_IMAGE_OP_NO_OP:
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_SET:
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_COPY:
case H5FD_FILE_IMAGE_OP_PROPERTY_LIST_GET:
case H5FD_FILE_IMAGE_OP_FILE_OPEN:
case H5FD_FILE_IMAGE_OP_FILE_RESIZE:
default:
goto out;
} /* end switch */
return (SUCCEED);
out:
return (FAIL);
} /* end image_free() */
/*-------------------------------------------------------------------------
* Function: udata_copy
*
* Purpose: Simulates the copying of the user data structure utilized in the
* management of the "copying" of file images.
*
* Return: Address of "newly allocated" structure, if successful. Otherwise, it
* returns NULL.
*
*-------------------------------------------------------------------------
*/
static void *
udata_copy(void *_udata)
{
H5LT_file_image_ud_t *udata = (H5LT_file_image_ud_t *)_udata;
/* callback is only used if the application buffer is not actually copied */
if (!(udata->flags & H5LT_FILE_IMAGE_DONT_COPY))
goto out;
if (udata->ref_count == 0)
goto out;
udata->ref_count++;
return (udata);
out:
return NULL;
} /* end udata_copy */
/*-------------------------------------------------------------------------
* Function: udata_free
*
* Purpose: Simulates deallocation of the user data structure utilized in the
* management of the "copying" of file images. The data structure is
* actually deallocated when there are no outstanding references.
*
* Return: SUCCEED or FAIL
*
*-------------------------------------------------------------------------
*/
static herr_t
udata_free(void *_udata)
{
H5LT_file_image_ud_t *udata = (H5LT_file_image_ud_t *)_udata;
/* callback is only used if the application buffer is not actually copied */
if (!(udata->flags & H5LT_FILE_IMAGE_DONT_COPY))
goto out;
if (udata->ref_count == 0)
goto out;
udata->ref_count--;
if (udata->ref_count == 0) {
/* There should not be any outstanding references
* to the udata structure at this point.
*/
assert(udata->fapl_ref_count == 0);
assert(udata->vfd_ref_count == 0);
free(udata);
}
return (SUCCEED);
out:
return (FAIL);
} /* end udata_free */
/* End of callbacks definitions for file image operations */
/*-------------------------------------------------------------------------
*
* internal functions
*
*-------------------------------------------------------------------------
*/
static herr_t H5LT_get_attribute_mem(hid_t loc_id, const char *obj_name, const char *attr_name,
hid_t mem_type_id, void *data);
/*-------------------------------------------------------------------------
* Function: H5LT_make_dataset
*
* Purpose: Creates and writes a dataset of a type tid
*
* Return: Success: 0, Failure: -1
*
*-------------------------------------------------------------------------
*/
static herr_t
H5LT_make_dataset_numerical(hid_t loc_id, const char *dset_name, int rank, const hsize_t *dims, hid_t tid,
const void *data)
{
hid_t did = -1, sid = -1;
/* check the arguments */
if (dset_name == NULL)
return -1;
/* Create the data space for the dataset. */
if ((sid = H5Screate_simple(rank, dims, NULL)) < 0)
return -1;
/* Create the dataset. */
if ((did = H5Dcreate2(loc_id, dset_name, tid, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
goto out;
/* Write the dataset only if there is data to write */
if (data)
if (H5Dwrite(did, tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, data) < 0)
goto out;
/* End access to the dataset and release resources used by it. */
if (H5Dclose(did) < 0)
return -1;
/* Terminate access to the data space. */
if (H5Sclose(sid) < 0)
return -1;
return 0;
out:
H5E_BEGIN_TRY
{
H5Dclose(did);
H5Sclose(sid);
}
H5E_END_TRY
return -1;
}
/*-------------------------------------------------------------------------
*
* Public functions
*
*-------------------------------------------------------------------------
*/
/*-------------------------------------------------------------------------
* Function: H5LTmake_dataset
*
* Purpose: Creates and writes a dataset of a type tid
*
* Return: Success: 0, Failure: -1
*
* Comments:
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTmake_dataset(hid_t loc_id, const char *dset_name, int rank, const hsize_t *dims, hid_t tid,
const void *data)
{
return (H5LT_make_dataset_numerical(loc_id, dset_name, rank, dims, tid, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTmake_dataset_char
*
* Purpose: Creates and writes a dataset of H5T_NATIVE_CHAR type
*
* Return: Success: 0, Failure: -1
*
* Comments:
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTmake_dataset_char(hid_t loc_id, const char *dset_name, int rank, const hsize_t *dims, const char *data)
{
return (H5LT_make_dataset_numerical(loc_id, dset_name, rank, dims, H5T_NATIVE_CHAR, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTmake_dataset_short
*
* Purpose: Creates and writes a dataset of H5T_NATIVE_SHORT type
*
* Return: Success: 0, Failure: -1
*
* Comments:
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTmake_dataset_short(hid_t loc_id, const char *dset_name, int rank, const hsize_t *dims, const short *data)
{
return (H5LT_make_dataset_numerical(loc_id, dset_name, rank, dims, H5T_NATIVE_SHORT, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTmake_dataset_int
*
* Purpose: Creates and writes a dataset of H5T_NATIVE_INT type
*
* Return: Success: 0, Failure: -1
*
* Comments:
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTmake_dataset_int(hid_t loc_id, const char *dset_name, int rank, const hsize_t *dims, const int *data)
{
return (H5LT_make_dataset_numerical(loc_id, dset_name, rank, dims, H5T_NATIVE_INT, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTmake_dataset_long
*
* Purpose: Creates and writes a dataset of H5T_NATIVE_LONG type
*
* Return: Success: 0, Failure: -1
*
* Comments:
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTmake_dataset_long(hid_t loc_id, const char *dset_name, int rank, const hsize_t *dims, const long *data)
{
return (H5LT_make_dataset_numerical(loc_id, dset_name, rank, dims, H5T_NATIVE_LONG, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTmake_dataset_float
*
* Purpose: Creates and writes a dataset of H5T_NATIVE_FLOAT type
*
* Return: Success: 0, Failure: -1
*
* Comments:
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTmake_dataset_float(hid_t loc_id, const char *dset_name, int rank, const hsize_t *dims, const float *data)
{
return (H5LT_make_dataset_numerical(loc_id, dset_name, rank, dims, H5T_NATIVE_FLOAT, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTmake_dataset_double
*
* Purpose: Creates and writes a dataset of H5T_NATIVE_DOUBLE type
*
* Return: Success: 0, Failure: -1
*
* Comments:
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTmake_dataset_double(hid_t loc_id, const char *dset_name, int rank, const hsize_t *dims,
const double *data)
{
return (H5LT_make_dataset_numerical(loc_id, dset_name, rank, dims, H5T_NATIVE_DOUBLE, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTmake_dataset_string
*
* Purpose: Creates and writes a dataset of H5T_C_S1 type
*
* Return: Success: 0, Failure: -1
*
* Comments:
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTmake_dataset_string(hid_t loc_id, const char *dset_name, const char *buf)
{
hid_t did = -1;
hid_t sid = -1;
hid_t tid = -1;
size_t size;
/* check the arguments */
if (dset_name == NULL)
return -1;
/* create a string data type */
if ((tid = H5Tcopy(H5T_C_S1)) < 0)
goto out;
size = strlen(buf) + 1; /* extra null term */
if (H5Tset_size(tid, size) < 0)
goto out;
if (H5Tset_strpad(tid, H5T_STR_NULLTERM) < 0)
goto out;
/* Create the data space for the dataset. */
if ((sid = H5Screate(H5S_SCALAR)) < 0)
goto out;
/* Create the dataset. */
if ((did = H5Dcreate2(loc_id, dset_name, tid, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
goto out;
/* Write the dataset only if there is data to write */
if (buf)
if (H5Dwrite(did, tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf) < 0)
goto out;
/* close*/
if (H5Dclose(did) < 0)
return -1;
if (H5Sclose(sid) < 0)
return -1;
if (H5Tclose(tid) < 0)
goto out;
return 0;
out:
H5E_BEGIN_TRY
{
H5Dclose(did);
H5Tclose(tid);
H5Sclose(sid);
}
H5E_END_TRY
return -1;
}
/*-------------------------------------------------------------------------
* Function: H5LTopen_file_image
*
* Purpose: Open a user supplied file image using the core file driver.
*
* Return: File identifier, Failure: -1
*
*-------------------------------------------------------------------------
*/
hid_t
H5LTopen_file_image(void *buf_ptr, size_t buf_size, unsigned flags)
{
H5LT_file_image_ud_t *udata = NULL; /* Pointer to udata structure */
hid_t fapl = -1, file_id = -1; /* HDF5 identifiers */
unsigned file_open_flags; /* Flags for image open */
char file_name[64]; /* Filename buffer */
size_t alloc_incr; /* Buffer allocation increment */
size_t min_incr = 65536; /* Minimum buffer increment */
double buf_prcnt = 0.1; /* Percentage of buffer size to set as increment */
static long file_name_counter;
H5FD_file_image_callbacks_t callbacks = {&image_malloc, &image_memcpy, &image_realloc, &image_free,
&udata_copy, &udata_free, (void *)NULL};
/* check arguments */
if (buf_ptr == NULL)
goto out;
if (buf_size == 0)
goto out;
if (flags & (unsigned)~(H5LT_FILE_IMAGE_ALL))
goto out;
/* Create FAPL to transmit file image */
if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
goto out;
/* set allocation increment to a percentage of the supplied buffer size, or
* a pre-defined minimum increment value, whichever is larger
*/
if ((size_t)(buf_prcnt * (double)buf_size) > min_incr)
alloc_incr = (size_t)(buf_prcnt * (double)buf_size);
else
alloc_incr = min_incr;
/* Configure FAPL to use the core file driver */
if (H5Pset_fapl_core(fapl, alloc_incr, false) < 0)
goto out;
/* Set callbacks for file image ops ONLY if the file image is NOT copied */
if (flags & H5LT_FILE_IMAGE_DONT_COPY) {
/* Allocate buffer to communicate user data to callbacks */
if (NULL == (udata = (H5LT_file_image_ud_t *)malloc(sizeof(H5LT_file_image_ud_t))))
goto out;
/* Initialize udata with info about app buffer containing file image and flags */
udata->app_image_ptr = buf_ptr;
udata->app_image_size = buf_size;
udata->fapl_image_ptr = NULL;
udata->fapl_image_size = 0;
udata->fapl_ref_count = 0;
udata->vfd_image_ptr = NULL;
udata->vfd_image_size = 0;
udata->vfd_ref_count = 0;
udata->flags = flags;
/*
* Initialize the udata structure with a reference count of 1. At
* first, nothing holds this reference to the udata structure. The
* call to H5Pset_file_image_callbacks below will associate the
* udata structure with the FAPL, incrementing the structure's
* reference count and causing the FAPL to hold one of the two
* references to the structure in preparation for transfer of
* ownership to the file driver. Once the file has been opened with
* this FAPL and the FAPL is closed, the reference held by the FAPL
* is released and ownership is transferred to the file driver, which
* will then hold the remaining reference to the udata structure.
* The udata structure will then be freed when the file driver calls
* the image_free callback and releases its reference to the structure.
*/
udata->ref_count = 1;
/* copy address of udata into callbacks */
callbacks.udata = (void *)udata;
/* Set file image callbacks */
if (H5Pset_file_image_callbacks(fapl, &callbacks) < 0) {
udata_free(udata);
goto out;
}
} /* end if */
/* Assign file image in user buffer to FAPL */
if (H5Pset_file_image(fapl, buf_ptr, buf_size) < 0)
goto out;
/* set file open flags */
if (flags & H5LT_FILE_IMAGE_OPEN_RW)
file_open_flags = H5F_ACC_RDWR;
else
file_open_flags = H5F_ACC_RDONLY;
/* define a unique file name */
snprintf(file_name, (sizeof(file_name) - 1), "file_image_%ld", file_name_counter++);
/* Assign file image in FAPL to the core file driver */
if ((file_id = H5Fopen(file_name, file_open_flags, fapl)) < 0)
goto out;
/* Close FAPL */
if (H5Pclose(fapl) < 0)
goto out;
/* Return file identifier */
return file_id;
out:
H5E_BEGIN_TRY
{
H5Pclose(fapl);
H5Fclose(file_id);
}
H5E_END_TRY
return -1;
} /* end H5LTopen_file_image() */
/*-------------------------------------------------------------------------
* Function: H5LT_read_dataset
*
* Purpose: Reads a dataset from disk.
*
* Return: Success: 0, Failure: -1
*
*-------------------------------------------------------------------------
*/
static herr_t
H5LT_read_dataset_numerical(hid_t loc_id, const char *dset_name, hid_t tid, void *data)
{
hid_t did;
/* check the arguments */
if (dset_name == NULL)
return -1;
/* Open the dataset. */
if ((did = H5Dopen2(loc_id, dset_name, H5P_DEFAULT)) < 0)
return -1;
/* Read */
if (H5Dread(did, tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, data) < 0)
goto out;
/* End access to the dataset and release resources used by it. */
if (H5Dclose(did))
return -1;
return 0;
out:
H5Dclose(did);
return -1;
}
/*-------------------------------------------------------------------------
* Function: H5LTread_dataset
*
* Purpose: Reads a dataset from disk.
*
* Return: Success: 0, Failure: -1
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTread_dataset(hid_t loc_id, const char *dset_name, hid_t tid, void *data)
{
return (H5LT_read_dataset_numerical(loc_id, dset_name, tid, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTread_dataset_char
*
* Purpose: Reads a dataset from disk.
*
* Return: Success: 0, Failure: -1
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTread_dataset_char(hid_t loc_id, const char *dset_name, char *data)
{
return (H5LT_read_dataset_numerical(loc_id, dset_name, H5T_NATIVE_CHAR, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTread_dataset_short
*
* Purpose: Reads a dataset from disk.
*
* Return: Success: 0, Failure: -1
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTread_dataset_short(hid_t loc_id, const char *dset_name, short *data)
{
return (H5LT_read_dataset_numerical(loc_id, dset_name, H5T_NATIVE_SHORT, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTread_dataset_int
*
* Purpose: Reads a dataset from disk.
*
* Return: Success: 0, Failure: -1
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTread_dataset_int(hid_t loc_id, const char *dset_name, int *data)
{
return (H5LT_read_dataset_numerical(loc_id, dset_name, H5T_NATIVE_INT, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTread_dataset_long
*
* Purpose: Reads a dataset from disk.
*
* Return: Success: 0, Failure: -1
*
*-------------------------------------------------------------------------
*/
herr_t
H5LTread_dataset_long(hid_t loc_id, const char *dset_name, long *data)
{
return (H5LT_read_dataset_numerical(loc_id, dset_name, H5T_NATIVE_LONG, data));
}
/*-------------------------------------------------------------------------
* Function: H5LTread_dataset_float
*
* Purpose: Reads a dataset from disk.
*