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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* 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 files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Friday, August 27, 1999
*/
#define H5Z_PACKAGE /*suppress error about including H5Zpkg */
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5MMprivate.h" /* Memory management */
#include "H5Zpkg.h" /* Data filters */
#ifdef H5_HAVE_FILTER_DEFLATE
#ifdef H5_HAVE_ZLIB_H
# include "zlib.h"
#endif
/* Local function prototypes */
static size_t H5Z_filter_deflate (unsigned flags, size_t cd_nelmts,
const unsigned cd_values[], size_t nbytes, size_t *buf_size, void **buf);
/* This message derives from H5Z */
const H5Z_class_t H5Z_DEFLATE[1] = {{
H5Z_CLASS_T_VERS, /* H5Z_class_t version */
H5Z_FILTER_DEFLATE, /* Filter id number */
1, /* encoder_present flag (set to true) */
1, /* decoder_present flag (set to true) */
"deflate", /* Filter name for debugging */
NULL, /* The "can apply" callback */
NULL, /* The "set local" callback */
H5Z_filter_deflate, /* The actual filter function */
}};
#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: Size of buffer filtered
* Failure: 0
*
* Programmer: Robb Matzke
* Thursday, April 16, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static size_t
H5Z_filter_deflate (unsigned flags, size_t cd_nelmts,
const unsigned cd_values[], size_t nbytes,
size_t *buf_size, void **buf)
{
void *outbuf = NULL; /* Pointer to new buffer */
int status; /* Status from zlib operation */
size_t ret_value; /* Return value */
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")
if (flags & H5Z_FLAG_REVERSE) {
/* Input; uncompress */
z_stream z_strm; /* zlib parameters */
size_t nalloc = *buf_size; /* Number of bytes for output (compressed) buffer */
/* Allocate space for the compressed buffer */
if (NULL==(outbuf = H5MM_malloc(nalloc)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed for deflate uncompression")
/* Set the uncompression parameters */
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);
/* Initialize the uncompression routines */
if (Z_OK!=inflateInit(&z_strm))
HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, 0, "inflateInit() failed")
/* Loop to uncompress the buffer */
do {
/* Uncompress some data */
status = inflate(&z_strm, Z_SYNC_FLUSH);
/* Check if we are done uncompressing data */
if (Z_STREAM_END==status)
break; /*done*/
/* Check for error */
if (Z_OK!=status) {
(void)inflateEnd(&z_strm);
HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, 0, "inflate() failed")
}
else {
/* If we're not done and just ran out of buffer space, get more */
if (0==z_strm.avail_out) {
/* Allocate a buffer twice as big */
nalloc *= 2;
if (NULL==(outbuf = H5MM_realloc(outbuf, nalloc))) {
(void)inflateEnd(&z_strm);
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed for deflate uncompression")
}
/* Update pointers to buffer for next set of uncompressed data */
z_strm.next_out = (unsigned char*)outbuf + z_strm.total_out;
z_strm.avail_out = (uInt)(nalloc - z_strm.total_out);
}
} /* end else */
} while(status==Z_OK);
/* Free the input buffer */
H5MM_xfree(*buf);
/* Set return values */
*buf = outbuf;
outbuf = NULL;
*buf_size = nalloc;
ret_value = z_strm.total_out;
/* Finish uncompressing the stream */
(void)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;
int aggression; /* Compression aggression setting */
/* Set the compression aggression level */
H5_ASSIGN_OVERFLOW(aggression,cd_values[0],unsigned,int);
/* Allocate output (compressed) buffer */
if (NULL==(z_dst=outbuf=H5MM_malloc(z_dst_nbytes)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "unable to allocate deflate destination buffer")
/* Perform compression from the source to the destination buffer */
status = compress2 (z_dst, &z_dst_nbytes, z_src, z_src_nbytes, aggression);
/* Check for various zlib errors */
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")
/* Successfully uncompressed the buffer */
else {
/* Free the input buffer */
H5MM_xfree(*buf);
/* Set return values */
*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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