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324
g10/compress.c
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324
g10/compress.c
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/* compress.c - compress filter
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* Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <zlib.h>
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#ifdef __riscos__
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# include "zlib-riscos.h"
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#endif
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#include "util.h"
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#include "memory.h"
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#include "packet.h"
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#include "filter.h"
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#include "main.h"
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#include "options.h"
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static void
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init_compress( compress_filter_context_t *zfx, z_stream *zs )
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{
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int rc;
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int level;
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#ifdef __riscos__
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static int zlib_initialized = 0;
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if (!zlib_initialized)
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zlib_initialized = riscos_load_module("ZLib", zlib_path, 1);
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#endif
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if( opt.compress >= 0 && opt.compress <= 9 )
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level = opt.compress;
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else if( opt.compress == -1 )
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level = Z_DEFAULT_COMPRESSION;
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else if( opt.compress == 10 ) /* remove this ! */
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level = 0;
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else {
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log_error("invalid compression level; using default level\n");
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level = Z_DEFAULT_COMPRESSION;
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}
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if( (rc = zfx->algo == 1? deflateInit2( zs, level, Z_DEFLATED,
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-13, 8, Z_DEFAULT_STRATEGY)
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: deflateInit( zs, level )
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) != Z_OK ) {
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log_fatal("zlib problem: %s\n", zs->msg? zs->msg :
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rc == Z_MEM_ERROR ? "out of core" :
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rc == Z_VERSION_ERROR ? "invalid lib version" :
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"unknown error" );
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}
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zfx->outbufsize = 8192;
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zfx->outbuf = m_alloc( zfx->outbufsize );
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}
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static int
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do_compress( compress_filter_context_t *zfx, z_stream *zs, int flush, IOBUF a )
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{
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int zrc;
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unsigned n;
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do {
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#ifndef __riscos__
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zs->next_out = zfx->outbuf;
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#else /* __riscos__ */
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zs->next_out = (Bytef *) zfx->outbuf;
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#endif /* __riscos__ */
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zs->avail_out = zfx->outbufsize;
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if( DBG_FILTER )
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log_debug("enter deflate: avail_in=%u, avail_out=%u, flush=%d\n",
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(unsigned)zs->avail_in, (unsigned)zs->avail_out, flush );
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zrc = deflate( zs, flush );
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if( zrc == Z_STREAM_END && flush == Z_FINISH )
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;
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else if( zrc != Z_OK ) {
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if( zs->msg )
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log_fatal("zlib deflate problem: %s\n", zs->msg );
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else
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log_fatal("zlib deflate problem: rc=%d\n", zrc );
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}
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n = zfx->outbufsize - zs->avail_out;
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if( DBG_FILTER )
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log_debug("leave deflate: "
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"avail_in=%u, avail_out=%u, n=%u, zrc=%d\n",
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(unsigned)zs->avail_in, (unsigned)zs->avail_out,
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(unsigned)n, zrc );
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if( iobuf_write( a, zfx->outbuf, n ) ) {
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log_debug("deflate: iobuf_write failed\n");
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return G10ERR_WRITE_FILE;
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}
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} while( zs->avail_in || (flush == Z_FINISH && zrc != Z_STREAM_END) );
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return 0;
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}
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static void
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init_uncompress( compress_filter_context_t *zfx, z_stream *zs )
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{
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int rc;
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/****************
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* PGP uses a windowsize of 13 bits. Using a negative value for
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* it forces zlib not to expect a zlib header. This is a
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* undocumented feature Peter Gutmann told me about.
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*
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* We must use 15 bits for the inflator because CryptoEx uses 15
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* bits thus the output would get scrambled w/o error indication
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* if we would use 13 bits. For the uncompressing this does not
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* matter at all.
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*/
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if( (rc = zfx->algo == 1? inflateInit2( zs, -15)
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: inflateInit( zs )) != Z_OK ) {
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log_fatal("zlib problem: %s\n", zs->msg? zs->msg :
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rc == Z_MEM_ERROR ? "out of core" :
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rc == Z_VERSION_ERROR ? "invalid lib version" :
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"unknown error" );
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}
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zfx->inbufsize = 2048;
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zfx->inbuf = m_alloc( zfx->inbufsize );
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zs->avail_in = 0;
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}
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static int
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do_uncompress( compress_filter_context_t *zfx, z_stream *zs,
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IOBUF a, size_t *ret_len )
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{
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int zrc;
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int rc=0;
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size_t n;
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int nread, count;
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int refill = !zs->avail_in;
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if( DBG_FILTER )
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log_debug("begin inflate: avail_in=%u, avail_out=%u, inbuf=%u\n",
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(unsigned)zs->avail_in, (unsigned)zs->avail_out,
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(unsigned)zfx->inbufsize );
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do {
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if( zs->avail_in < zfx->inbufsize && refill ) {
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n = zs->avail_in;
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if( !n )
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#ifndef __riscos__
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zs->next_in = zfx->inbuf;
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#else /* __riscos__ */
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zs->next_in = (Bytef *) zfx->inbuf;
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#endif /* __riscos__ */
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count = zfx->inbufsize - n;
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nread = iobuf_read( a, zfx->inbuf + n, count );
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if( nread == -1 ) nread = 0;
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n += nread;
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/* If we use the undocumented feature to suppress
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* the zlib header, we have to give inflate an
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* extra dummy byte to read */
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if( nread < count && zfx->algo == 1 ) {
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*(zfx->inbuf + n) = 0xFF; /* is it really needed ? */
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zfx->algo1hack = 1;
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n++;
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}
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zs->avail_in = n;
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}
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refill = 1;
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if( DBG_FILTER )
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log_debug("enter inflate: avail_in=%u, avail_out=%u\n",
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(unsigned)zs->avail_in, (unsigned)zs->avail_out);
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#ifdef Z_SYNC_FLUSH
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zrc = inflate( zs, Z_SYNC_FLUSH );
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#else
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zrc = inflate( zs, Z_PARTIAL_FLUSH );
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#endif
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if( DBG_FILTER )
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log_debug("leave inflate: avail_in=%u, avail_out=%u, zrc=%d\n",
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(unsigned)zs->avail_in, (unsigned)zs->avail_out, zrc);
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if( zrc == Z_STREAM_END )
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rc = -1; /* eof */
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else if( zrc != Z_OK && zrc != Z_BUF_ERROR ) {
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if( zs->msg )
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log_fatal("zlib inflate problem: %s\n", zs->msg );
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else
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log_fatal("zlib inflate problem: rc=%d\n", zrc );
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}
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} while( zs->avail_out && zrc != Z_STREAM_END && zrc != Z_BUF_ERROR );
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*ret_len = zfx->outbufsize - zs->avail_out;
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if( DBG_FILTER )
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log_debug("do_uncompress: returning %u bytes\n", (unsigned)*ret_len );
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return rc;
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}
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int
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compress_filter( void *opaque, int control,
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IOBUF a, byte *buf, size_t *ret_len)
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{
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size_t size = *ret_len;
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compress_filter_context_t *zfx = opaque;
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z_stream *zs = zfx->opaque;
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int rc=0;
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if( control == IOBUFCTRL_UNDERFLOW ) {
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if( !zfx->status ) {
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zs = zfx->opaque = m_alloc_clear( sizeof *zs );
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init_uncompress( zfx, zs );
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zfx->status = 1;
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}
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#ifndef __riscos__
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zs->next_out = buf;
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#else /* __riscos__ */
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zs->next_out = (Bytef *) buf;
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#endif /* __riscos__ */
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zs->avail_out = size;
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zfx->outbufsize = size; /* needed only for calculation */
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rc = do_uncompress( zfx, zs, a, ret_len );
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}
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else if( control == IOBUFCTRL_FLUSH ) {
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if( !zfx->status ) {
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PACKET pkt;
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PKT_compressed cd;
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if( !zfx->algo )
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zfx->algo = DEFAULT_COMPRESS_ALGO;
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if( zfx->algo != 1 && zfx->algo != 2 )
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BUG();
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memset( &cd, 0, sizeof cd );
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cd.len = 0;
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cd.algorithm = zfx->algo;
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init_packet( &pkt );
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pkt.pkttype = PKT_COMPRESSED;
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pkt.pkt.compressed = &cd;
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if( build_packet( a, &pkt ))
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log_bug("build_packet(PKT_COMPRESSED) failed\n");
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zs = zfx->opaque = m_alloc_clear( sizeof *zs );
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init_compress( zfx, zs );
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zfx->status = 2;
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}
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#ifndef __riscos__
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zs->next_in = buf;
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#else /* __riscos__ */
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zs->next_in = (Bytef *) buf;
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#endif /* __riscos__ */
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zs->avail_in = size;
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rc = do_compress( zfx, zs, Z_NO_FLUSH, a );
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}
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else if( control == IOBUFCTRL_FREE ) {
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if( zfx->status == 1 ) {
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inflateEnd(zs);
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m_free(zs);
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zfx->opaque = NULL;
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m_free(zfx->outbuf); zfx->outbuf = NULL;
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}
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else if( zfx->status == 2 ) {
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#ifndef __riscos__
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zs->next_in = buf;
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#else /* __riscos__ */
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zs->next_in = (Bytef *) buf;
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#endif /* __riscos__ */
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zs->avail_in = 0;
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do_compress( zfx, zs, Z_FINISH, a );
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deflateEnd(zs);
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m_free(zs);
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zfx->opaque = NULL;
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m_free(zfx->outbuf); zfx->outbuf = NULL;
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}
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if (zfx->release)
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zfx->release (zfx);
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}
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else if( control == IOBUFCTRL_DESC )
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*(char**)buf = "compress_filter";
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return rc;
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}
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static void
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release_context (compress_filter_context_t *ctx)
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{
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m_free (ctx);
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}
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/****************
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* Handle a compressed packet
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*/
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int
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handle_compressed( void *procctx, PKT_compressed *cd,
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int (*callback)(IOBUF, void *), void *passthru )
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{
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compress_filter_context_t *cfx;
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int rc;
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if( cd->algorithm < 1 || cd->algorithm > 2 )
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return G10ERR_COMPR_ALGO;
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cfx = m_alloc_clear (sizeof *cfx);
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cfx->algo = cd->algorithm;
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cfx->release = release_context;
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iobuf_push_filter( cd->buf, compress_filter, cfx );
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if( callback )
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rc = callback(cd->buf, passthru );
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else
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rc = proc_packets(procctx, cd->buf);
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cd->buf = NULL;
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return rc;
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}
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