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/*
* Copyright (C) 1997 National Center for Supercomputing Applications
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Friday, September 19, 1997
*
*/
#define H5G_PACKAGE
#include <H5private.h>
#include <H5ACprivate.h>
#include <H5Eprivate.h>
#include <H5Gpkg.h>
#include <H5HLprivate.h>
#include <H5MMprivate.h>
#include <H5Oprivate.h>
#define PABLO_MASK H5G_stab_mask
static intn interface_initialize_g = 0;
#define INTERFACE_INIT NULL
/*-------------------------------------------------------------------------
* Function: H5G_stab_create
*
* Purpose: Creates a new empty symbol table (object header, name heap,
* and B-tree). The caller can specify an initial size for the
* name heap. The object header of the group is opened for
* write access.
*
* In order for the B-tree to operate correctly, the first
* item in the heap is the empty string, and must appear at
* heap offset zero.
*
* Errors:
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Aug 1 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5G_stab_create(H5F_t *f, size_t init, H5G_entry_t *self/*out*/)
{
size_t name; /*offset of "" name */
H5O_stab_t stab; /*symbol table message */
FUNC_ENTER(H5G_stab_create, FAIL);
/*
* Check arguments.
*/
assert(f);
assert(self);
init = MAX(init, H5HL_SIZEOF_FREE(f) + 2);
/* Create symbol table private heap */
if (H5HL_create(f, init, &(stab.heap_addr)/*out*/)<0) {
HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create heap");
}
name = H5HL_insert(f, &(stab.heap_addr), 1, "");
if ((size_t)(-1)==name) {
HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't initialize heap");
}
/*
* B-tree's won't work if the first name isn't at the beginning
* of the heap.
*/
assert(0 == name);
/* Create the B-tree */
if (H5B_create(f, H5B_SNODE, NULL, &(stab.btree_addr) /*out */ ) < 0) {
HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create B-tree");
}
/*
* Create symbol table object header. It has a zero link count
* since nothing refers to it yet. The link count will be
* incremented if the object is added to the group directed graph.
*/
if (H5O_create(f, 4 + 2 * H5F_SIZEOF_ADDR(f), self /*out */ ) < 0) {
HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create header");
}
/*
* Insert the symbol table message into the object header and the symbol
* table entry.
*/
if (H5O_modify(self, H5O_STAB, H5O_NEW_MESG, H5O_FLAG_CONSTANT, &stab)<0) {
H5O_close(self);
HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create message");
}
self->cache.stab.btree_addr = stab.btree_addr;
self->cache.stab.heap_addr = stab.heap_addr;
self->type = H5G_CACHED_STAB;
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5G_stab_find
*
* Purpose: Finds a symbol named NAME in the symbol table whose
* description is stored in GRP_ENT in file F and returns its
* symbol table entry through OBJ_ENT (which is optional).
*
* Errors:
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Aug 1 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5G_stab_find(H5G_entry_t *grp_ent, const char *name,
H5G_entry_t *obj_ent/*out*/)
{
H5G_bt_ud1_t udata; /*data to pass through B-tree */
H5O_stab_t stab; /*symbol table message */
FUNC_ENTER(H5G_stab_find, FAIL);
/* Check arguments */
assert(grp_ent);
assert(grp_ent->file);
assert(name && *name);
/* set up the udata */
if (NULL == H5O_read(grp_ent, H5O_STAB, 0, &stab)) {
HRETURN_ERROR(H5E_SYM, H5E_BADMESG, FAIL, "can't read message");
}
udata.operation = H5G_OPER_FIND;
udata.name = name;
udata.heap_addr = stab.heap_addr;
/* search the B-tree */
if (H5B_find(grp_ent->file, H5B_SNODE, &(stab.btree_addr), &udata) < 0) {
HRETURN_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "not found");
}
if (obj_ent) *obj_ent = udata.ent;
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5G_stab_insert
*
* Purpose: Insert a new symbol into the table described by GRP_ENT in
* file F. The name of the new symbol is NAME and its symbol
* table entry is OBJ_ENT.
*
* Errors:
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Aug 1 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5G_stab_insert(H5G_entry_t *grp_ent, const char *name, H5G_entry_t *obj_ent)
{
H5O_stab_t stab; /*symbol table message */
H5G_bt_ud1_t udata; /*data to pass through B-tree */
static double split_ratios[3] = {0.1, 0.5, 0.9};
FUNC_ENTER(H5G_stab_insert, FAIL);
/* check arguments */
assert(grp_ent && grp_ent->file);
assert(name && *name);
assert(obj_ent && obj_ent->file);
if (grp_ent->file->shared != obj_ent->file->shared) {
HRETURN_ERROR(H5E_SYM, H5E_LINK, FAIL,
"interfile hard links are not allowed");
}
/* initialize data to pass through B-tree */
if (NULL == H5O_read(grp_ent, H5O_STAB, 0, &stab)) {
HRETURN_ERROR(H5E_SYM, H5E_BADMESG, FAIL, "not a symbol table");
}
udata.operation = H5G_OPER_INSERT;
udata.name = name;
udata.heap_addr = stab.heap_addr;
udata.ent = *obj_ent;
/* insert */
if (H5B_insert(grp_ent->file, H5B_SNODE, &(stab.btree_addr), split_ratios,
&udata) < 0) {
HRETURN_ERROR(H5E_SYM, H5E_CANTINSERT, FAIL, "unable to insert entry");
}
/* update the name offset in the entry */
obj_ent->name_off = udata.ent.name_off;
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5G_stab_remove
*
* Purpose: Remove NAME from a symbol table.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Thursday, September 17, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5G_stab_remove(H5G_entry_t *grp_ent, const char *name)
{
H5O_stab_t stab; /*symbol table message */
H5G_bt_ud1_t udata; /*data to pass through B-tree */
FUNC_ENTER(H5G_stab_remove, FAIL);
assert(grp_ent && grp_ent->file);
assert(name && *name);
/* initialize data to pass through B-tree */
if (NULL==H5O_read(grp_ent, H5O_STAB, 0, &stab)) {
HRETURN_ERROR(H5E_SYM, H5E_BADMESG, FAIL, "not a symbol table");
}
udata.operation = H5G_OPER_REMOVE;
udata.name = name;
udata.heap_addr = stab.heap_addr;
HDmemset(&(udata.ent), 0, sizeof(udata.ent));
/* remove */
if (H5B_remove(grp_ent->file, H5B_SNODE, &(stab.btree_addr), &udata)<0) {
HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to remove entry");
}
FUNC_LEAVE(SUCCEED);
}
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