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/* $Id: compress.c 1116 2011-09-15 18:24:08Z stsci_embray $
*/
/*****************************************************************************/
/* */
/* This file, compress.c, contains the code required to compress and */
/* uncompress data using the GZIP_1 compression format. */
/* */
/* Copyright (C) 2004 Association of Universities for Research in Astronomy */
/* (AURA) */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following conditions are */
/* met: */
/* */
/* 1. Redistributions of source code must retain the above copyright */
/* notice, this list of conditions and the following disclaimer. */
/* */
/* 2. Redistributions in binary form must reproduce the above */
/* copyright notice, this list of conditions and the following */
/* disclaimer in the documentation and/or other materials provided */
/* with the distribution. */
/* */
/* 3. The name of AURA and its representatives may not be used to */
/* endorse or promote products derived from this software without */
/* specific prior written permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY AURA ``AS IS'' AND ANY EXPRESS OR IMPLIED */
/* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
/* DISCLAIMED. IN NO EVENT SHALL AURA BE LIABLE FOR ANY DIRECT, INDIRECT, */
/* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, */
/* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS */
/* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND */
/* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR */
/* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE */
/* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH */
/* DAMAGE. */
/* */
/* This file was copied and heavily modified from the FITSIO software that */
/* was written by William Pence at the High Energy Astrophysic Science */
/* Archive Research Center (HEASARC) at the NASA Goddard Space Flight Center.*/
/* That software contained the following copyright and warranty notices: */
/* */
/* Copyright (Unpublished--all rights reserved under the copyright laws of */
/* the United States), U.S. Government as represented by the Administrator */
/* of the National Aeronautics and Space Administration. No copyright is */
/* claimed in the United States under Title 17, U.S. Code. */
/* */
/* Permission to freely use, copy, modify, and distribute this software */
/* and its documentation without fee is hereby granted, provided that this */
/* copyright notice and disclaimer of warranty appears in all copies. */
/* */
/* DISCLAIMER: */
/* */
/* THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, */
/* EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, */
/* ANY WARRANTY THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY */
/* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR */
/* PURPOSE, AND FREEDOM FROM INFRINGEMENT, AND ANY WARRANTY THAT THE */
/* DOCUMENTATION WILL CONFORM TO THE SOFTWARE, OR ANY WARRANTY THAT THE */
/* SOFTWARE WILL BE ERROR FREE. IN NO EVENT SHALL NASA BE LIABLE FOR ANY */
/* DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT, INDIRECT, SPECIAL OR */
/* CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, OR IN ANY WAY */
/* CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY, */
/* CONTRACT, TORT , OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY */
/* PERSONS OR PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED */
/* FROM, OR AROSE OUT OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR */
/* SERVICES PROVIDED HEREUNDER." */
/* */
/* This code calls routines from and links to the ZLIB compression library */
/* that was written by Jean-loup Gailly and Mark Adler. This package is */
/* normally destributed with Python 2.5. That software containes the */
/* following copyright and warranty notices: */
/* */
/* Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler */
/* */
/* This software is provided 'as-is', without any express or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/* Jean-loup Gailly Mark Adler */
/* jloup@gzip.org madler@alumni.caltech.edu */
/* */
/* */
/* The data format used by the zlib library is described by RFCs (Request */
/* for Comments) 1950 to 1952 in the files */
/* http://www.ietf.org/rfc/rfc1950.txt (zlib format), */
/* rfc1951.txt (deflate format) and rfc1952.txt (gzip format). */
/* */
/*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "zlib.h"
int _pyfits_uncompress2mem_from_mem(
char *inmemptr,
size_t inmemsize,
char **buffptr,
size_t *buffsize,
void *(*mem_realloc)(void *p, size_t newsize),
size_t *filesize,
int *status);
int _pyfits_compress2mem_from_mem(
char *inmemptr,
size_t inmemsize,
char **buffptr,
size_t *buffsize,
void *(*mem_realloc)(void *p, size_t newsize),
size_t *filesize,
int *status);
/*--------------------------------------------------------------------------*/
int _pyfits_uncompress2mem_from_mem(
char *inmemptr, /* I - memory pointer to compressed bytes */
size_t inmemsize, /* I - size of input compressed file */
char **buffptr, /* IO - memory pointer */
size_t *buffsize, /* IO - size of buffer, in bytes */
void *(*mem_realloc)(void *p, size_t newsize), /* function */
size_t *filesize, /* O - size of file, in bytes */
int *status) /* IO - error status */
/*
Uncompress the file into memory. Fill whatever amount of memory has
already been allocated, then realloc more memory, using the supplied
input function, if necessary.
*/
{
int err;
uLong uncomprLen;
Byte *uncompr;
z_stream d_stream; /* decompression stream */
uLong bytes_out_so_far = 0; /* Keeps track of the number of bytes put in
the output buffer so far */
if (*status > 0)
return(*status);
/* Allocate memory as a temporary buffer in which to uncompress. */
uncomprLen = *buffsize;
uncompr = (Byte*)malloc(*buffsize);
d_stream.zalloc = (alloc_func)0;
d_stream.zfree = (free_func)0;
d_stream.opaque = (voidpf)0;
d_stream.next_in = (unsigned char*)inmemptr;
d_stream.avail_in = inmemsize;
/* Initialize the decompression. The argument (15+16) tells the
decompressor that we are to use the gzip algorithm */
err = inflateInit2(&d_stream, (15+16));
if (err != Z_OK)
{
/* free temporary output data buffer */
free(uncompr);
return(*status = 414);
}
for (;;)
{
/* Output to the temporary buffer. This will overwrite the
previous data each time. */
d_stream.next_out = uncompr;
d_stream.avail_out = uncomprLen;
err = _pyfits_inflate(&d_stream, Z_NO_FLUSH);
if (err != Z_OK && err != Z_STREAM_END)
{
/* free temporary output data buffer */
free(uncompr);
return(*status = 414);
}
if (d_stream.total_out > *buffsize)
{
/* OK, we need more memory for the output so reallocate it */
*buffsize = d_stream.total_out;
*buffptr = mem_realloc(*buffptr,*buffsize);
if (*buffptr == NULL)
{
/* free temporary output data buffer */
free(uncompr);
return(*status = 414);
}
}
/* copy from the temporary buffer into the output memory buffer */
memcpy((char *) *buffptr + bytes_out_so_far, (char *) uncompr,
d_stream.total_out-bytes_out_so_far);
bytes_out_so_far = d_stream.total_out;
if (err == Z_STREAM_END) break; /* We reached the end of the input */
}
/* Set the output file size to be the total output data */
*filesize = d_stream.total_out;
/* End the decompression */
err = _pyfits_inflateEnd(&d_stream);
/* free temporary output data buffer */
free(uncompr);
if (err != Z_OK)
{
return(*status = 414);
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int _pyfits_compress2mem_from_mem(
char *inmemptr, /* I - memory pointer to uncompressed bytes */
size_t inmemsize, /* I - size of input uncompressed file */
char **buffptr, /* IO - memory pointer for compressed file */
size_t *buffsize, /* IO - size of buffer, in bytes */
void *(*mem_realloc)(void *p, size_t newsize), /* function */
size_t *filesize, /* O - size of file, in bytes */
int *status) /* IO - error status */
/*
Compress the file into memory. Fill whatever amount of memory has
already been allocated, then realloc more memory, using the supplied
input function, if necessary.
*/
{
int err;
uLong comprLen;
Byte *compr;
z_stream c_stream; /* compression stream */
uLong bytes_out_so_far = 0; /* Keeps track of the number of bytes put in
the output buffer so far */
if (*status > 0)
return(*status);
/* Allocate memory as a temporary buffer in which to compress. */
comprLen = *buffsize;
compr = (Byte*)malloc(*buffsize);
c_stream.zalloc = (alloc_func)0;
c_stream.zfree = (free_func)0;
c_stream.opaque = (voidpf)0;
/* Initialize the compression. The argument (15+16) tells the
compressor that we are to use the gzip algorythm */
err = deflateInit2(&c_stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
(15+16), 8, Z_DEFAULT_STRATEGY);
if (err != Z_OK)
{
return(*status = 413);
}
c_stream.next_in = (unsigned char*)inmemptr;
c_stream.avail_in = inmemsize;
for (;;)
{
/* Output to the temporary buffer. This will overwrite the
previous data each time. */
c_stream.next_out = compr;
c_stream.avail_out = comprLen;
err = _pyfits_deflate(&c_stream, Z_FINISH);
if (err != Z_OK && err != Z_STREAM_END)
{
/* free temporary output data buffer */
free(compr);
return(*status = 413);
}
if (c_stream.total_out > *buffsize)
{
/* OK, we need more memory for the output so reallocate it */
*buffsize = c_stream.total_out;
*buffptr = mem_realloc(*buffptr,*buffsize);
if (*buffptr == NULL)
{
/* free temporary output data buffer */
free(compr);
return(*status = 413);
}
}
/* copy from the temporary buffer into the output memory buffer */
memcpy((char *) *buffptr + bytes_out_so_far, (char *) compr,
c_stream.total_out-bytes_out_so_far);
bytes_out_so_far = c_stream.total_out;
if (err == Z_STREAM_END) break; /* We reached the end of the input */
}
/* Set the output file size to be the total output data */
*filesize = c_stream.total_out;
/* End the compression */
err = _pyfits_deflateEnd(&c_stream);
/* free temporary output data buffer */
free(compr);
if (err != Z_OK)
{
return(*status = 413);
}
return(*status);
}
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