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/*
* Copyright (C) 1997 NCSA
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Wednesday, October 22, 1997
*
* Purpose: This file implements an in-core temporary file. It's intended
* for storing small temporary files such as wrappers generated
* on the fly.
*
* Note: This is mostly an exercise to help clean up parts of the H5F
* package since this driver is quite different than the other
* low level drivers we have so far.
*
*/
#include <H5private.h>
#include <H5Eprivate.h>
#include <H5Fprivate.h>
#include <H5MMprivate.h>
#define H5F_CORE_INC 10240 /*amount by which to grow file */
#define H5F_CORE_DEV 0xffff /*pseudo dev for core until we fix things*/
#define PABLO_MASK H5F_core
static hbool_t interface_initialize_g = FALSE;
static hbool_t H5F_core_access (const char *name, int mode, H5F_search_t *key);
static H5F_low_t *H5F_core_open (const char *name, uintn flags, H5F_search_t*);
static herr_t H5F_core_close (H5F_low_t *lf);
static herr_t H5F_core_read (H5F_low_t *lf, const haddr_t *addr, size_t size,
uint8 *buf);
static herr_t H5F_core_write (H5F_low_t *lf, const haddr_t *addr, size_t size,
const uint8 *buf);
const H5F_low_class_t H5F_LOW_CORE[1] = {{
H5F_core_access, /* access method */
H5F_core_open, /* open method */
H5F_core_close, /* close method */
H5F_core_read, /* read method */
H5F_core_write, /* write method */
NULL, /* flush method */
NULL, /* extend method */
}};
/*-------------------------------------------------------------------------
* Function: H5F_core_access
*
* Purpose: Determines if the specified file already exists. This driver
* doesn't use names, so every call to H5F_core_open() would
* create a new file. Therefore, this function always returns
* false and KEY is never initialized.
*
* Return: Success: FALSE
*
* Failure: FAIL
*
* Programmer: Robb Matzke
* Friday, October 24, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static hbool_t
H5F_core_access (const char *name, int mode, H5F_search_t *key/*out*/)
{
FUNC_ENTER (H5F_core_access, NULL, FAIL);
FUNC_LEAVE (FALSE);
}
/*-------------------------------------------------------------------------
* Function: H5F_core_open
*
* Purpose: Opens a temporary file which will exist only in memory. The
* NAME argument is unused. The FLAGS are a bit field with
* the possible values defined in H5F_low_open().
*
* Errors:
* IO CANTOPENFILE Must creat file with write access.
*
* Return: Success: Low-level file pointer
*
* Failure: NULL
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static H5F_low_t *
H5F_core_open (const char *name, uintn flags, H5F_search_t *key)
{
H5F_low_t *lf = NULL;
static ino_t ino=0;
FUNC_ENTER (H5F_core_open, NULL, NULL);
if (0==(flags & H5F_ACC_WRITE) || 0==(flags & H5F_ACC_CREAT)) {
/* must creat file with write access */
HRETURN_ERROR (H5E_IO, H5E_CANTOPENFILE, NULL);
}
lf = H5MM_xcalloc (1, sizeof(H5F_low_t));
lf->u.core.mem = H5MM_xmalloc (H5F_CORE_INC);
lf->u.core.alloc = H5F_CORE_INC;
lf->u.core.size = 0;
H5F_addr_reset (&(lf->eof));
if (key) {
key->dev = H5F_CORE_DEV;
key->ino = ino++;
}
FUNC_LEAVE (lf);
}
/*-------------------------------------------------------------------------
* Function: H5F_core_close
*
* Purpose: Closes a file.
*
* Errors:
*
* Return: Success: SUCCEED
*
* Failure: FAIL
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5F_core_close (H5F_low_t *lf)
{
FUNC_ENTER (H5F_core_close, NULL, FAIL);
lf->u.core.mem = H5MM_xfree (lf->u.core.mem);
lf->u.core.size = 0;
lf->u.core.alloc = 0;
FUNC_LEAVE (SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5F_core_read
*
* Purpose: Reads SIZE bytes beginning at address ADDR in file LF and
* places them in buffer BUF. Reading past the logical or
* physical end of the file returns zeros instead of failing.
*
* Errors:
*
* Return: Success: SUCCEED
*
* Failure: FAIL
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5F_core_read (H5F_low_t *lf, const haddr_t *addr, size_t size, uint8 *buf)
{
size_t n;
size_t eof;
FUNC_ENTER (H5F_core_read, NULL, FAIL);
assert (lf);
assert (addr && H5F_addr_defined (addr));
assert (buf);
eof = MIN (lf->eof.offset, lf->u.core.size);
if (addr->offset>=eof) {
HDmemset (buf, 0, size);
} else {
n = MIN (size, eof - addr->offset);
HDmemcpy (buf, lf->u.core.mem + addr->offset, n);
HDmemset (buf+n, 0, size-n);
}
FUNC_LEAVE (SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5F_core_write
*
* Purpose: Writes SIZE bytes from the beginning of BUF into file LF at
* file address ADDR. The file is extended as necessary to
* accommodate the new data.
*
* Errors:
*
* Return: Success: SUCCEED
*
* Failure: FAIL
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5F_core_write (H5F_low_t *lf, const haddr_t *addr, size_t size,
const uint8 *buf)
{
size_t inc_amount;
FUNC_ENTER (H5F_core_write, NULL, FAIL);
assert (lf);
assert (addr && H5F_addr_defined (addr));
assert (buf);
/* Allocate more space */
if (addr->offset+size>lf->u.core.alloc) {
inc_amount = MAX (addr->offset+size-lf->u.core.alloc, H5F_CORE_INC);
lf->u.core.alloc = lf->u.core.alloc + inc_amount;
lf->u.core.mem = H5MM_xrealloc (lf->u.core.mem, lf->u.core.alloc);
}
/* Move the physical EOF marker */
if (addr->offset+size>lf->u.core.size) {
lf->u.core.size = addr->offset + size;
}
/* Copy data */
HDmemcpy (lf->u.core.mem+addr->offset, buf, size);
FUNC_LEAVE (SUCCEED);
}
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