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/*
* Copyright © 1999-2001 NCSA
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Friday, August 27, 1999
*/
#include "H5private.h"
#include "H5Eprivate.h"
#include "H5MMprivate.h"
#include "H5Zprivate.h"
#ifdef H5_HAVE_FILTER_DEFLATE
#ifdef H5_HAVE_ZLIB_H
# include "zlib.h"
#endif
/* Interface initialization */
#define PABLO_MASK H5Z_deflate_mask
#define INTERFACE_INIT NULL
static int interface_initialize_g = 0;
#define H5Z_DEFLATE_SIZE_ADJUST(s) (HDceil((double)((s)*1.001))+12)
/*-------------------------------------------------------------------------
* Function: H5Z_filter_deflate
*
* Purpose: Implement an I/O filter around the 'deflate' algorithm in
* libz
*
* Return: Success:
*
* Failure:
*
* Programmer: Robb Matzke
* Thursday, April 16, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
size_t
H5Z_filter_deflate (unsigned flags, size_t cd_nelmts,
const unsigned cd_values[], size_t nbytes,
size_t *buf_size, void **buf)
{
size_t ret_value = 0;
void *outbuf = NULL;
int aggression = 6;
int status;
FUNC_ENTER_NOAPI(H5Z_filter_deflate, 0);
/* Check arguments */
if (cd_nelmts!=1 || cd_values[0]>9)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid deflate aggression level");
aggression = cd_values[0];
if (flags & H5Z_FLAG_REVERSE) {
/* Input; uncompress */
z_stream z_strm;
size_t nalloc = *buf_size;
if (NULL==(outbuf = H5MM_malloc(nalloc)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed for deflate uncompression");
HDmemset(&z_strm, 0, sizeof(z_strm));
z_strm.next_in = *buf;
H5_ASSIGN_OVERFLOW(z_strm.avail_in,nbytes,size_t,uInt);
z_strm.next_out = outbuf;
H5_ASSIGN_OVERFLOW(z_strm.avail_out,nalloc,size_t,uInt);
if (Z_OK!=inflateInit(&z_strm))
HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, 0, "inflateInit() failed");
while (1) {
status = inflate(&z_strm, Z_SYNC_FLUSH);
if (Z_STREAM_END==status)
break; /*done*/
if (Z_OK!=status) {
inflateEnd(&z_strm);
HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, 0, "inflate() failed");
}
if (Z_OK==status && 0==z_strm.avail_out) {
nalloc *= 2;
if (NULL==(outbuf = H5MM_realloc(outbuf, nalloc))) {
inflateEnd(&z_strm);
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed for deflate uncompression");
}
z_strm.next_out = (unsigned char*)outbuf + z_strm.total_out;
z_strm.avail_out = (uInt)(nalloc - z_strm.total_out);
}
}
H5MM_xfree(*buf);
*buf = outbuf;
outbuf = NULL;
*buf_size = nalloc;
ret_value = z_strm.total_out;
inflateEnd(&z_strm);
} else {
/*
* Output; compress but fail if the result would be larger than the
* input. The library doesn't provide in-place compression, so we
* must allocate a separate buffer for the result.
*/
const Bytef *z_src = (const Bytef*)(*buf);
Bytef *z_dst; /*destination buffer */
uLongf z_dst_nbytes = (uLongf)H5Z_DEFLATE_SIZE_ADJUST(nbytes);
uLong z_src_nbytes = (uLong)nbytes;
if (NULL==(z_dst=outbuf=H5MM_malloc(z_dst_nbytes)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "unable to allocate deflate destination buffer");
status = compress2 (z_dst, &z_dst_nbytes, z_src, z_src_nbytes, aggression);
if (Z_BUF_ERROR==status) {
HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, 0, "overflow");
} else if (Z_MEM_ERROR==status) {
HGOTO_ERROR (H5E_PLINE, H5E_CANTINIT, 0, "deflate memory error");
} else if (Z_OK!=status) {
HGOTO_ERROR (H5E_PLINE, H5E_CANTINIT, 0, "other deflate error");
} else {
H5MM_xfree(*buf);
*buf = outbuf;
outbuf = NULL;
*buf_size = nbytes;
ret_value = z_dst_nbytes;
}
}
done:
if(outbuf)
H5MM_xfree(outbuf);
FUNC_LEAVE_NOAPI(ret_value);
}
#endif /* H5_HAVE_FILTER_DEFLATE */
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