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/**
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
* zlib deflate compression wrapper library
*/
#include <stdio.h>
#include <stdlib.h>
#include "zlib.h"
#include "GEN_messaging.h"
#include "BLO_writeStreamGlue.h"
#include "BLO_deflate.h"
#include "BLO_in_de_flateHeader.h"
// TODO use other error function
static int CHECK_ERR(int err, char *msg);
static int CHECK_ERR(int err, char *msg) {
if (err != Z_OK) {
#ifndef NDEBUG
fprintf(GEN_errorstream,
"%s error: %d\n",
msg,
err);
#endif
return 1;
}
return 0;
}
int
BLO_deflate(
unsigned char *data,
unsigned int dataIn,
struct streamGlueHeaderStruct *streamGlueHeader)
{
int zlib_err; /* zlib error */
int err = 0; /* our own error */
z_stream c_stream; /* compression stream */
char dictionary[50];
Bytef *compressBuf; /* minimally sized output buffer for deflate */
uInt compressSize; /* minimally sized compressBuf size in bytes */
struct writeStreamGlueStruct *streamGlue = NULL;
struct BLO_in_de_flateHeaderStruct BLO_in_de_flateHeader;
char* errmsg1 = "deflateInit";
char* errmsg2 = "deflateSetDictionary";
char* errmsg3 = "deflateEnd";
// TODO use dictionary index, this is id = 1 :
strcpy(dictionary, "sure this is not a number");
compressSize = (dataIn * 1.1) + 12;
compressBuf = (Bytef *)malloc(compressSize);
if (!compressBuf) {
err = BWS_SETFUNCTION(BWS_DEFLATE) |
BWS_SETGENERR(BWS_MALLOC);
return err;
}
c_stream.next_out = compressBuf;
c_stream.avail_out = compressSize;
c_stream.next_in = data;
c_stream.avail_in = dataIn;
c_stream.zalloc = (alloc_func)0;
c_stream.zfree = (free_func)0;
c_stream.opaque = (voidpf)0;
zlib_err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
if (CHECK_ERR(zlib_err, errmsg1)) {
err = BWS_SETFUNCTION(BWS_DEFLATE) |
BWS_SETSPECERR(BWS_DEFLATEERROR);
free(compressBuf);
return err;
}
zlib_err = deflateSetDictionary(&c_stream,
(const Bytef*)dictionary,
strlen(dictionary));
if (CHECK_ERR(zlib_err, errmsg2)) {
err = BWS_SETFUNCTION(BWS_DEFLATE) |
BWS_SETSPECERR(BWS_DEFLATEERROR);
free(compressBuf);
return err;
}
// Compress it
zlib_err = deflate(&c_stream, Z_FINISH);
if (zlib_err != Z_STREAM_END) {
#ifndef NDEBUG
fprintf(GEN_errorstream,
"deflate should report Z_STREAM_END\n");
#endif
// (avail_out == 0) possibility ? Should not, because we
// malloc by the minimal needed amount rule
err = BWS_SETFUNCTION(BWS_DEFLATE) |
BWS_SETSPECERR(BWS_DEFLATEERROR);
free(compressBuf);
return err;
}
zlib_err = deflateEnd(&c_stream);
if (CHECK_ERR(zlib_err, errmsg3)) {
err = BWS_SETFUNCTION(BWS_DEFLATE) |
BWS_SETSPECERR(BWS_DEFLATEERROR);
free(compressBuf);
return err;
}
#ifndef NDEBUG
fprintf(GEN_errorstream,
"BLO_deflate compressed %ld bytes to %ld (%.0f%%)\n",
c_stream.total_in, c_stream.total_out,
100. * (float)c_stream.total_out / (float)c_stream.total_in);
fprintf(GEN_errorstream,
"BLO_deflate writes streamGlueHeader of %u bytes\n",
STREAMGLUEHEADERSIZE);
#endif
// Update streamGlueHeader that initiated us and write it away
streamGlueHeader->totalStreamLength =
htonl(IN_DE_FLATEHEADERSTRUCTSIZE + c_stream.total_out);
streamGlueHeader->crc = htonl(crc32(0L, (const Bytef *) streamGlueHeader,
STREAMGLUEHEADERSIZE - 4));
err = writeStreamGlue(
Global_streamGlueControl,
&streamGlue,
(unsigned char *) streamGlueHeader,
STREAMGLUEHEADERSIZE,
0);
if (err) {
free(compressBuf);
return err;
}
#ifndef NDEBUG
fprintf(GEN_errorstream,
"BLO_deflate writes BLO_in_de_flateHeader of %u bytes\n",
IN_DE_FLATEHEADERSTRUCTSIZE);
#endif
// write out our header
BLO_in_de_flateHeader.magic = 'B';
BLO_in_de_flateHeader.compressedLength = htonl(c_stream.total_out);
BLO_in_de_flateHeader.uncompressedLength = htonl(c_stream.total_in);
BLO_in_de_flateHeader.dictionary_id = htonl(1);
BLO_in_de_flateHeader.dictId = htonl(c_stream.adler); // adler checksum
BLO_in_de_flateHeader.crc = htonl(crc32(0L,
(const Bytef *) &BLO_in_de_flateHeader, IN_DE_FLATEHEADERSTRUCTSIZE-4));
err = writeStreamGlue(
Global_streamGlueControl,
&streamGlue,
(unsigned char *) &BLO_in_de_flateHeader,
IN_DE_FLATEHEADERSTRUCTSIZE,
0);
if (err) {
free(compressBuf);
return err;
}
#ifndef NDEBUG
fprintf(GEN_errorstream,
"BLO_deflate writes %lu bytes raw data (total %lu)\n",
c_stream.total_out, STREAMGLUEHEADERSIZE +
IN_DE_FLATEHEADERSTRUCTSIZE + c_stream.total_out);
#endif
// finally write all compressed data
err = writeStreamGlue(
Global_streamGlueControl,
&streamGlue,
(unsigned char *) compressBuf,
c_stream.total_out,
1);
free(compressBuf);
return err;
}
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