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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 *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5Gcache.c
*
* Purpose: Implement group metadata cache methods
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#include "H5Gmodule.h" /* This source code file is part of the H5G module */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Gpkg.h" /* Groups */
#include "H5MMprivate.h" /* Memory management */
/****************/
/* Local Macros */
/****************/
#define H5G_NODE_VERS 1 /* Symbol table node version number */
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/* Metadata cache (H5AC) callbacks */
static herr_t H5G__cache_node_get_initial_load_size(void *udata, size_t *image_len);
static void *H5G__cache_node_deserialize(const void *image, size_t len, void *udata, bool *dirty);
static herr_t H5G__cache_node_image_len(const void *thing, size_t *image_len);
static herr_t H5G__cache_node_serialize(const H5F_t *f, void *image, size_t len, void *thing);
static herr_t H5G__cache_node_free_icr(void *thing);
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/* Symbol table nodes inherit cache-like properties from H5AC */
const H5AC_class_t H5AC_SNODE[1] = {{
H5AC_SNODE_ID, /* Metadata client ID */
"Symbol table node", /* Metadata client name (for debugging) */
H5FD_MEM_BTREE, /* File space memory type for client */
H5AC__CLASS_NO_FLAGS_SET, /* Client class behavior flags */
H5G__cache_node_get_initial_load_size, /* 'get_initial_load_size' callback */
NULL, /* 'get_final_load_size' callback */
NULL, /* 'verify_chksum' callback */
H5G__cache_node_deserialize, /* 'deserialize' callback */
H5G__cache_node_image_len, /* 'image_len' callback */
NULL, /* 'pre_serialize' callback */
H5G__cache_node_serialize, /* 'serialize' callback */
NULL, /* 'notify' callback */
H5G__cache_node_free_icr, /* 'free_icr' callback */
NULL, /* 'fsf_size' callback */
}};
/* Declare extern the free list to manage the H5G_node_t struct */
H5FL_EXTERN(H5G_node_t);
/* Declare extern the free list to manage sequences of H5G_entry_t's */
H5FL_SEQ_EXTERN(H5G_entry_t);
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_get_initial_load_size()
*
* Purpose: Determine the size of the on-disk image of the node, and
* return this value in *image_len.
*
* Return: SUCCEED/FAIL
*-------------------------------------------------------------------------
*/
static herr_t
H5G__cache_node_get_initial_load_size(void *_udata, size_t *image_len)
{
H5F_t *f = (H5F_t *)_udata; /* User data for callback */
FUNC_ENTER_PACKAGE_NOERR
assert(f);
assert(image_len);
/* Set the image length size */
*image_len = (size_t)(H5G_NODE_SIZE(f));
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5G__cache_node_get_initial_load_size() */
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_deserialize
*
* Purpose: Given a buffer containing the on disk image of a symbol table
* node, allocate an instance of H5G_node_t, load the contents of the
* image into it, and return a pointer to the instance.
*
* Note that deserializing the image requires access to the file
* pointer, which is not included in the parameter list for this
* callback. Finesse this issue by passing in the file pointer
* twice to the H5AC_protect() call -- once as the file pointer
* proper, and again as the user data
*
* Return: Success: Pointer to in core representation
* Failure: NULL
*-------------------------------------------------------------------------
*/
static void *
H5G__cache_node_deserialize(const void *_image, size_t len, void *_udata, bool H5_ATTR_UNUSED *dirty)
{
H5F_t *f = (H5F_t *)_udata; /* User data for callback */
H5G_node_t *sym = NULL; /* Symbol table node created */
const uint8_t *image = (const uint8_t *)_image; /* Pointer to image to deserialize */
const uint8_t *image_end = image + len - 1; /* Pointer to end of image buffer */
void *ret_value = NULL;
FUNC_ENTER_PACKAGE
assert(image);
assert(len > 0);
assert(f);
assert(dirty);
/* Allocate symbol table data structures */
if (NULL == (sym = H5FL_CALLOC(H5G_node_t)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
sym->node_size = (size_t)(H5G_NODE_SIZE(f));
if (NULL == (sym->entry = H5FL_SEQ_CALLOC(H5G_entry_t, (size_t)(2 * H5F_SYM_LEAF_K(f)))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
/* Magic */
if (H5_IS_BUFFER_OVERFLOW(image, H5_SIZEOF_MAGIC, image_end))
HGOTO_ERROR(H5E_SYM, H5E_OVERFLOW, NULL, "ran off end of input buffer while decoding");
if (memcmp(image, H5G_NODE_MAGIC, (size_t)H5_SIZEOF_MAGIC) != 0)
HGOTO_ERROR(H5E_SYM, H5E_BADVALUE, NULL, "bad symbol table node signature");
image += H5_SIZEOF_MAGIC;
/* Version */
if (H5_IS_BUFFER_OVERFLOW(image, 1, image_end))
HGOTO_ERROR(H5E_SYM, H5E_OVERFLOW, NULL, "ran off end of input buffer while decoding");
if (H5G_NODE_VERS != *image++)
HGOTO_ERROR(H5E_SYM, H5E_VERSION, NULL, "bad symbol table node version");
/* Reserved */
if (H5_IS_BUFFER_OVERFLOW(image, 1, image_end))
HGOTO_ERROR(H5E_SYM, H5E_OVERFLOW, NULL, "ran off end of input buffer while decoding");
image++;
/* Number of symbols */
if (H5_IS_BUFFER_OVERFLOW(image, 2, image_end))
HGOTO_ERROR(H5E_SYM, H5E_OVERFLOW, NULL, "ran off end of input buffer while decoding");
UINT16DECODE(image, sym->nsyms);
/* Entries */
if (H5G__ent_decode_vec(f, &image, image_end, sym->entry, sym->nsyms) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTLOAD, NULL, "unable to decode symbol table entries");
/* Set return value */
ret_value = sym;
done:
if (!ret_value)
if (sym && H5G__node_free(sym) < 0)
HDONE_ERROR(H5E_SYM, H5E_CANTFREE, NULL, "unable to destroy symbol table node");
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__cache_node_deserialize() */
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_image_len
*
* Purpose: Compute the size of the data structure on disk and return
* it in *image_len
*
* Return: SUCCEED/FAIL
*-------------------------------------------------------------------------
*/
static herr_t
H5G__cache_node_image_len(const void *_thing, size_t *image_len)
{
const H5G_node_t *sym = (const H5G_node_t *)_thing; /* Pointer to object */
FUNC_ENTER_PACKAGE_NOERR
assert(sym);
assert(sym->cache_info.type == H5AC_SNODE);
assert(image_len);
*image_len = sym->node_size;
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5G__cache_node_image_len() */
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_serialize
*
* Purpose: Given a correctly sized buffer and an instance of H5G_node_t,
* serialize the contents of the instance of H5G_node_t, and write
* this data into the supplied buffer. This buffer will be written
* to disk.
*
* Return: SUCCEED/FAIL
*-------------------------------------------------------------------------
*/
static herr_t
H5G__cache_node_serialize(const H5F_t *f, void *_image, size_t len, void *_thing)
{
H5G_node_t *sym = (H5G_node_t *)_thing; /* Pointer to object */
uint8_t *image = (uint8_t *)_image; /* Pointer into raw data buffer */
herr_t ret_value = SUCCEED;
FUNC_ENTER_PACKAGE
assert(f);
assert(image);
assert(sym);
assert(sym->cache_info.type == H5AC_SNODE);
assert(len == sym->node_size);
/* Magic number */
H5MM_memcpy(image, H5G_NODE_MAGIC, (size_t)H5_SIZEOF_MAGIC);
image += H5_SIZEOF_MAGIC;
/* Version number */
*image++ = H5G_NODE_VERS;
/* Reserved */
*image++ = 0;
/* Number of symbols */
UINT16ENCODE(image, sym->nsyms);
/* Entries */
if (H5G__ent_encode_vec(f, &image, sym->entry, sym->nsyms) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTENCODE, FAIL, "can't serialize");
/* Clear rest of symbol table node */
memset(image, 0, len - (size_t)(image - (uint8_t *)_image));
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__cache_node_serialize() */
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_free_icr
*
* Purpose: Destroy a symbol table node in memory
*
* Return: SUCCEED/FAIL
*-------------------------------------------------------------------------
*/
static herr_t
H5G__cache_node_free_icr(void *_thing)
{
H5G_node_t *sym = (H5G_node_t *)_thing; /* Pointer to the object */
herr_t ret_value = SUCCEED;
FUNC_ENTER_PACKAGE
assert(sym);
assert(sym->cache_info.type == H5AC_SNODE);
/* Destroy symbol table node */
if (H5G__node_free(sym) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTFREE, FAIL, "unable to destroy symbol table node");
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__cache_node_free_icr() */
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