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/***************************************************************************
* *
* copyright (C) 2003, 2004 by Michael Buesch *
* email: mbuesch@freenet.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License version 2 *
* as published by the Free Software Foundation. *
* *
***************************************************************************/
/***************************************************************************
* copyright (C) 2004 by Ulf Schenk
* This file is originaly based on version 1.0.1 of pwmanager
* and was modified to run on embedded devices that run microkde
*
* $Id$
**************************************************************************/
#include "compressbzip2.h"
#include <stdlib.h>
#define BZ_NO_STDIO
#include <bzlib.h>
#define BZ_BLOCK_SIZE 9
#define BZ_WORK_FACTOR 30
#define EXPAND_COMPRESS_DESTBUF_BYTES 1024
#define EXPAND_DECOMPRESS_DESTBUF_BYTES (1024 * 10)
bool CompressBzip2::compress(string *d)
{
int ret;
char *dest, *source;
unsigned int sourceLen, destLen;
sourceLen = d->length();
destLen = calcCompressDestLen(sourceLen);
source = static_cast<char *>(malloc(sourceLen));
if (!source)
return false;
memcpy(source, d->c_str(), sourceLen);
dest = static_cast<char *>(malloc(destLen));
if (!dest) {
free(source);
return false;
}
while (1) {
ret = BZ2_bzBuffToBuffCompress(dest,
&destLen,
source,
sourceLen,
BZ_BLOCK_SIZE,
0,
BZ_WORK_FACTOR);
switch (ret) {
case BZ_OK:
goto out;
case BZ_OUTBUFF_FULL:
/* we don't use realloc(), because it may
* (in this case) unneccessarily copy the old block
* to the new allocated block.
*/
free(dest);
destLen += EXPAND_COMPRESS_DESTBUF_BYTES;
dest = static_cast<char *>(malloc(destLen));
if (!dest) {
free(source);
return false;
}
break;
default:
free(source),
free(dest);
return false;
}
}
out:
free(source);
d->assign(dest, destLen);
free(dest);
return true;
}
bool CompressBzip2::decompress(string *d)
{
int ret;
char *dest, *source;
unsigned int sourceLen, destLen;
sourceLen = d->length();
destLen = calcDecompressDestLen(sourceLen);
source = static_cast<char *>(malloc(sourceLen));
if (!source)
return false;
memcpy(source, d->c_str(), sourceLen);
dest = static_cast<char *>(malloc(destLen));
if (!dest) {
free(source);
return false;
}
while (1) {
ret = BZ2_bzBuffToBuffDecompress(dest,
&destLen,
source,
sourceLen,
0,
0);
switch (ret) {
case BZ_OK:
goto out;
case BZ_OUTBUFF_FULL:
/* we don't use realloc(), because it may
* (in this case) unneccessarily copy the old block
* to the new allocated block.
*/
free(dest);
destLen += EXPAND_DECOMPRESS_DESTBUF_BYTES;
dest = static_cast<char *>(malloc(destLen));
if (!dest) {
free(source);
return false;
}
break;
default:
free(source),
free(dest);
return false;
}
}
out:
free(source);
d->assign(dest, destLen);
free(dest);
return true;
}
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