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compress-bz2.c
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compress-bz2.c
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/* compress.c - bzip2 compress filter
* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <string.h>
#include <stdio.h> /* Early versions of bzlib (1.0) require stdio.h */
#include <bzlib.h>
#include "gpg.h"
#include "util.h"
#include "packet.h"
#include "filter.h"
#include "main.h"
#include "options.h"
/* Note that the code in compress.c is nearly identical to the code
here, so if you fix a bug here, look there to see if a matching bug
needs to be fixed. I tried to have one set of functions that could
do ZIP, ZLIB, and BZIP2, but it became dangerously unreadable with
#ifdefs and if(algo) -dshaw */
static void
init_compress( compress_filter_context_t *zfx, bz_stream *bzs )
{
int rc;
int level;
if( opt.bz2_compress_level >= 1 && opt.bz2_compress_level <= 9 )
level = opt.bz2_compress_level;
else if( opt.bz2_compress_level == -1 )
level = 6; /* no particular reason, but it seems reasonable */
else
{
log_error("invalid compression level; using default level\n");
level = 6;
}
if((rc=BZ2_bzCompressInit(bzs,level,0,0))!=BZ_OK)
log_fatal("bz2lib problem: %d\n",rc);
zfx->outbufsize = 8192;
zfx->outbuf = xmalloc( zfx->outbufsize );
}
static int
do_compress(compress_filter_context_t *zfx, bz_stream *bzs, int flush, IOBUF a)
{
int rc;
int zrc;
unsigned n;
do
{
bzs->next_out = zfx->outbuf;
bzs->avail_out = zfx->outbufsize;
if( DBG_FILTER )
log_debug("enter bzCompress: avail_in=%u, avail_out=%u, flush=%d\n",
(unsigned)bzs->avail_in, (unsigned)bzs->avail_out, flush );
zrc = BZ2_bzCompress( bzs, flush );
if( zrc == BZ_STREAM_END && flush == BZ_FINISH )
;
else if( zrc != BZ_RUN_OK && zrc != BZ_FINISH_OK )
log_fatal("bz2lib deflate problem: rc=%d\n", zrc );
n = zfx->outbufsize - bzs->avail_out;
if( DBG_FILTER )
log_debug("leave bzCompress:"
" avail_in=%u, avail_out=%u, n=%u, zrc=%d\n",
(unsigned)bzs->avail_in, (unsigned)bzs->avail_out,
(unsigned)n, zrc );
if( (rc=iobuf_write( a, zfx->outbuf, n )) )
{
log_debug("bzCompress: iobuf_write failed\n");
return rc;
}
}
while( bzs->avail_in || (flush == BZ_FINISH && zrc != BZ_STREAM_END) );
return 0;
}
static void
init_uncompress( compress_filter_context_t *zfx, bz_stream *bzs )
{
int rc;
if((rc=BZ2_bzDecompressInit(bzs,0,opt.bz2_decompress_lowmem))!=BZ_OK)
log_fatal("bz2lib problem: %d\n",rc);
zfx->inbufsize = 2048;
zfx->inbuf = xmalloc( zfx->inbufsize );
bzs->avail_in = 0;
}
static int
do_uncompress( compress_filter_context_t *zfx, bz_stream *bzs,
IOBUF a, size_t *ret_len )
{
int zrc;
int rc=0;
size_t n;
int nread, count;
int refill = !bzs->avail_in;
int eofseen = 0;
if( DBG_FILTER )
log_debug("begin bzDecompress: avail_in=%u, avail_out=%u, inbuf=%u\n",
(unsigned)bzs->avail_in, (unsigned)bzs->avail_out,
(unsigned)zfx->inbufsize );
do
{
if( bzs->avail_in < zfx->inbufsize && refill )
{
n = bzs->avail_in;
if( !n )
bzs->next_in = zfx->inbuf;
count = zfx->inbufsize - n;
nread = iobuf_read( a, zfx->inbuf + n, count );
if( nread == -1 )
{
eofseen = 1;
nread = 0;
}
n += nread;
bzs->avail_in = n;
}
if (!eofseen)
refill = 1;
if( DBG_FILTER )
log_debug("enter bzDecompress: avail_in=%u, avail_out=%u\n",
(unsigned)bzs->avail_in, (unsigned)bzs->avail_out);
zrc=BZ2_bzDecompress(bzs);
if( DBG_FILTER )
log_debug("leave bzDecompress: avail_in=%u, avail_out=%u, zrc=%d\n",
(unsigned)bzs->avail_in, (unsigned)bzs->avail_out, zrc);
if( zrc == BZ_STREAM_END )
rc = -1; /* eof */
else if( zrc != BZ_OK && zrc != BZ_PARAM_ERROR )
log_fatal("bz2lib inflate problem: rc=%d\n", zrc );
else if (zrc == BZ_OK && eofseen
&& !bzs->avail_in && bzs->avail_out > 0)
{
log_error ("unexpected EOF in bz2lib\n");
rc = GPG_ERR_BAD_DATA;
break;
}
}
while( bzs->avail_out && zrc != BZ_STREAM_END && zrc != BZ_PARAM_ERROR );
/* I'm not completely happy with the two uses of BZ_PARAM_ERROR
here. The corresponding zlib function is Z_BUF_ERROR, which
covers a narrower scope than BZ_PARAM_ERROR. -dshaw */
*ret_len = zfx->outbufsize - bzs->avail_out;
if( DBG_FILTER )
log_debug("do_uncompress: returning %u bytes\n", (unsigned)*ret_len );
return rc;
}
int
compress_filter_bz2( void *opaque, int control,
IOBUF a, byte *buf, size_t *ret_len)
{
size_t size = *ret_len;
compress_filter_context_t *zfx = opaque;
bz_stream *bzs = zfx->opaque;
int rc=0;
if( control == IOBUFCTRL_UNDERFLOW )
{
if( !zfx->status )
{
bzs = zfx->opaque = xmalloc_clear( sizeof *bzs );
init_uncompress( zfx, bzs );
zfx->status = 1;
}
bzs->next_out = buf;
bzs->avail_out = size;
zfx->outbufsize = size; /* needed only for calculation */
rc = do_uncompress( zfx, bzs, a, ret_len );
}
else if( control == IOBUFCTRL_FLUSH )
{
if( !zfx->status )
{
PACKET pkt;
PKT_compressed cd;
if( zfx->algo != COMPRESS_ALGO_BZIP2 )
BUG();
memset( &cd, 0, sizeof cd );
cd.len = 0;
cd.algorithm = zfx->algo;
init_packet( &pkt );
pkt.pkttype = PKT_COMPRESSED;
pkt.pkt.compressed = &cd;
if( build_packet( a, &pkt ))
log_bug("build_packet(PKT_COMPRESSED) failed\n");
bzs = zfx->opaque = xmalloc_clear( sizeof *bzs );
init_compress( zfx, bzs );
zfx->status = 2;
}
bzs->next_in = buf;
bzs->avail_in = size;
rc = do_compress( zfx, bzs, BZ_RUN, a );
}
else if( control == IOBUFCTRL_FREE )
{
if( zfx->status == 1 )
{
BZ2_bzDecompressEnd(bzs);
xfree(bzs);
zfx->opaque = NULL;
xfree(zfx->outbuf); zfx->outbuf = NULL;
}
else if( zfx->status == 2 )
{
bzs->next_in = buf;
bzs->avail_in = 0;
do_compress( zfx, bzs, BZ_FINISH, a );
BZ2_bzCompressEnd(bzs);
xfree(bzs);
zfx->opaque = NULL;
xfree(zfx->outbuf); zfx->outbuf = NULL;
}
if (zfx->release)
zfx->release (zfx);
}
else if( control == IOBUFCTRL_DESC )
*(char**)buf = "compress_filter";
return rc;
}

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