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/* -*- Mode: C; c-file-style: "bsd" -*-
* compress.c - Compression filters
* Copyright (C) 2002, 2003 Timo Schulz
* Copyright (C) 1998-2002 Free Software Foundation
*
* This file is part of OpenCDK.
*
* OpenCDK 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.
*
* OpenCDK 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 OpenCDK; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <time.h>
#ifdef HAVE_LIBZ
# include <zlib.h>
#endif
#include "opencdk.h"
#include "main.h"
#include "filters.h"
#ifdef HAVE_LIBZ
static int
compress_data( z_stream * zs, int flush,
byte * inbuf, size_t insize, FILE * out )
{
int nbytes, zrc;
byte buf[4096];
zs->next_in = inbuf;
zs->avail_in = insize;
do {
zs->next_out = buf;
zs->avail_out = sizeof buf;
zrc = deflate( zs, flush );
if( zrc == Z_STREAM_END && flush == Z_FINISH )
;
else if( zrc != Z_OK )
break;
nbytes = sizeof( buf ) - zs->avail_out;
fwrite( buf, 1, nbytes, out );
}
while( zs->avail_out == 0 || (flush == Z_FINISH && zrc != Z_STREAM_END) );
return zrc;
}
static int
decompress_data( compress_filter_t * zfx, z_stream * zs,
FILE * in, size_t * ret_len )
{
int nread = 0, nold;
int rc = 0, zrc = 0;
while( zs->avail_out != 0 ) {
if( !zs->avail_in ) {
nread = fread( zfx->inbuf, 1, zfx->inbufsize, in );
zs->next_in = zfx->inbuf;
zs->avail_in = nread;
}
nold = zs->avail_out;
zrc = inflate( zs, Z_SYNC_FLUSH );
if( zrc != Z_OK && zrc != Z_STREAM_END ) {
rc = CDK_Zlib_Error;
break;
}
*ret_len = zfx->outbufsize - zs->avail_out;
if( nold == zs->avail_out )
break;
if( zrc == Z_STREAM_END ) {
rc = EOF; /* eof */
break;
}
}
if( !nread && feof( in ) )
rc = -1;
return rc;
}
/* in some cases it might be possible that the packet header was not
readed, so we do it here. but we assume the the algo was already set. */
static void
skip_pktheader( FILE * in )
{
int ctb, pkttype, pos;
pos = ftell (in);
ctb = fgetc (in);
if (ctb & 0x80) {
pkttype = ctb & 0x40 ? (ctb & 0x3f) : ((ctb >> 2) & 0xf);
if (pkttype == CDK_PKT_COMPRESSED) {
fgetc (in);
return;
}
}
fseek (in, pos, SEEK_SET);
}
static int
compress_decode( void * opaque, FILE * in, FILE * out )
{
compress_filter_t * zfx = opaque;
z_stream * zs;
int zrc, rc = 0;
size_t nbytes;
_cdk_log_debug ("compress filter: decode (algo=%d)\n", zfx->algo);
if (!zfx || !in || !out)
return CDK_Inv_Value;
zs = cdk_calloc (1, sizeof *zs);
if (!zs)
return CDK_Out_Of_Core;
if (zfx->algo == CDK_COMPRESS_ZIP)
zrc = inflateInit2 (zs, -13);
else
zrc = inflateInit (zs);
if (zrc != Z_OK)
return CDK_Zlib_Error;
zfx->outbufsize = 8192;
zfx->inbufsize = 2048;
memset (zfx->inbuf, 0, sizeof zfx->inbuf);
zs->avail_in = 0;
skip_pktheader (in);
while (rc != -1) {
zs->next_out = zfx->outbuf;
zs->avail_out = 8192;
rc = decompress_data (zfx, zs, in, &nbytes);
fwrite (zfx->outbuf, 1, nbytes, out);
}
inflateEnd (zs);
cdk_free (zs);
if (rc == CDK_EOF)
rc = 0;
return rc;
}
static int
compress_encode( void * opaque, FILE * in, FILE * out )
{
compress_filter_t * zfx = opaque;
z_stream * zs;
struct cdk_pkt_compressed_s cd;
CDK_PACKET pkt;
clock_t start, end;
int rc, zrc, nread;
_cdk_log_debug ("compress filter: encode\n");
if( !zfx || !in || !out )
return CDK_Inv_Value;
if( !zfx->algo )
zfx->algo = CDK_COMPRESS_ZIP;
memset( &cd, 0, sizeof cd );
cd.len = 0;
cd.algorithm = zfx->algo;
pkt.pkttype = CDK_PKT_COMPRESSED;
pkt.pkt.compressed = &cd;
rc = _cdk_pkt_write_fp( out, &pkt );
if( rc )
return rc;
zs = cdk_calloc( 1, sizeof *zs );
if( !zs )
return CDK_Out_Of_Core;
if( zfx->algo == CDK_COMPRESS_ZIP )
rc = deflateInit2( zs, zfx->level, Z_DEFLATED, -13, 8,
Z_DEFAULT_STRATEGY );
else
rc = deflateInit( zs, zfx->level );
if( rc != Z_OK ) {
cdk_free( zs );
return CDK_Zlib_Error;
}
zfx->outbufsize = 8192;
memset( zfx->outbuf, 0, sizeof zfx->outbuf );
start = clock ();
while (!feof (in)) {
nread = fread (zfx->outbuf, 1, zfx->outbufsize, in);
if (!nread)
break;
zrc = compress_data (zs, Z_NO_FLUSH, zfx->outbuf, nread, out);
if (zrc) {
rc = CDK_Zlib_Error;
break;
}
}
if (!rc) {
nread = 0;
zrc = compress_data (zs, Z_FINISH, zfx->outbuf, nread, out);
if (zrc != Z_STREAM_END)
rc = CDK_Zlib_Error;
}
end = clock ();
/*printf ("compress encode: elapsed time %d\n", end - start);*/
deflateEnd (zs);
cdk_free (zs);
return rc;
}
int
_cdk_filter_compress( void * opaque, int ctl, FILE * in, FILE * out )
{
if( ctl == STREAMCTL_READ )
return compress_decode( opaque, in, out );
else if( ctl == STREAMCTL_WRITE )
return compress_encode( opaque, in, out );
else if( ctl == STREAMCTL_FREE ) {
compress_filter_t * zfx = opaque;
if( zfx ) {
_cdk_log_debug( "free compress filter\n" );
zfx->level = 0;
zfx->algo = 0;
}
}
return CDK_Inv_Mode;
}
#else
int
_cdk_filter_compress( void * opaque, int ctl, FILE * in, FILE * out )
{
return CDK_Not_Implemented;
}
#endif /* HAVE_LIBZ */
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