1 /* compress.c - compress filter
2 * Copyright (C) 1998, 1999, 2000, 2001, 2002,
3 * 2003, 2006 Free Software Foundation, Inc.
5 * This file is part of GnuPG.
7 * GnuPG is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3 of the License, or
10 * (at your option) any later version.
12 * GnuPG is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
21 /* Note that the code in compress-bz2.c is nearly identical to the
22 code here, so if you fix a bug here, look there to see if a
23 matching bug needs to be fixed. I tried to have one set of
24 functions that could do ZIP, ZLIB, and BZIP2, but it became
25 dangerously unreadable with #ifdefs and if(algo) -dshaw */
35 #if defined(__riscos__) && defined(USE_ZLIBRISCOS)
36 # include "zlib-riscos.h"
48 #define BYTEF_CAST(a) ((Bytef *)(a))
50 #define BYTEF_CAST(a) (a)
55 int compress_filter_bz2( void *opaque, int control,
56 IOBUF a, byte *buf, size_t *ret_len);
59 init_compress( compress_filter_context_t *zfx, z_stream *zs )
64 #if defined(__riscos__) && defined(USE_ZLIBRISCOS)
65 static int zlib_initialized = 0;
67 if (!zlib_initialized)
68 zlib_initialized = riscos_load_module("ZLib", zlib_path, 1);
71 if( opt.compress_level >= 1 && opt.compress_level <= 9 )
72 level = opt.compress_level;
73 else if( opt.compress_level == -1 )
74 level = Z_DEFAULT_COMPRESSION;
76 log_error("invalid compression level; using default level\n");
77 level = Z_DEFAULT_COMPRESSION;
80 if( (rc = zfx->algo == 1? deflateInit2( zs, level, Z_DEFLATED,
81 -13, 8, Z_DEFAULT_STRATEGY)
82 : deflateInit( zs, level )
84 log_fatal("zlib problem: %s\n", zs->msg? zs->msg :
85 rc == Z_MEM_ERROR ? "out of core" :
86 rc == Z_VERSION_ERROR ? "invalid lib version" :
90 zfx->outbufsize = 8192;
91 zfx->outbuf = xmalloc( zfx->outbufsize );
95 do_compress( compress_filter_context_t *zfx, z_stream *zs, int flush, IOBUF a )
102 zs->next_out = BYTEF_CAST (zfx->outbuf);
103 zs->avail_out = zfx->outbufsize;
105 log_debug("enter deflate: avail_in=%u, avail_out=%u, flush=%d\n",
106 (unsigned)zs->avail_in, (unsigned)zs->avail_out, flush );
107 zrc = deflate( zs, flush );
108 if( zrc == Z_STREAM_END && flush == Z_FINISH )
110 else if( zrc != Z_OK ) {
112 log_fatal("zlib deflate problem: %s\n", zs->msg );
114 log_fatal("zlib deflate problem: rc=%d\n", zrc );
116 n = zfx->outbufsize - zs->avail_out;
118 log_debug("leave deflate: "
119 "avail_in=%u, avail_out=%u, n=%u, zrc=%d\n",
120 (unsigned)zs->avail_in, (unsigned)zs->avail_out,
123 if( (rc=iobuf_write( a, zfx->outbuf, n )) ) {
124 log_debug("deflate: iobuf_write failed\n");
127 } while( zs->avail_in || (flush == Z_FINISH && zrc != Z_STREAM_END) );
132 init_uncompress( compress_filter_context_t *zfx, z_stream *zs )
137 * PGP uses a windowsize of 13 bits. Using a negative value for
138 * it forces zlib not to expect a zlib header. This is a
139 * undocumented feature Peter Gutmann told me about.
141 * We must use 15 bits for the inflator because CryptoEx uses 15
142 * bits thus the output would get scrambled w/o error indication
143 * if we would use 13 bits. For the uncompressing this does not
146 if( (rc = zfx->algo == 1? inflateInit2( zs, -15)
147 : inflateInit( zs )) != Z_OK ) {
148 log_fatal("zlib problem: %s\n", zs->msg? zs->msg :
149 rc == Z_MEM_ERROR ? "out of core" :
150 rc == Z_VERSION_ERROR ? "invalid lib version" :
154 zfx->inbufsize = 2048;
155 zfx->inbuf = xmalloc( zfx->inbufsize );
160 do_uncompress( compress_filter_context_t *zfx, z_stream *zs,
161 IOBUF a, size_t *ret_len )
168 int refill = !zs->avail_in;
171 log_debug("begin inflate: avail_in=%u, avail_out=%u, inbuf=%u\n",
172 (unsigned)zs->avail_in, (unsigned)zs->avail_out,
173 (unsigned)zfx->inbufsize );
175 if( zs->avail_in < zfx->inbufsize && refill ) {
178 zs->next_in = BYTEF_CAST (zfx->inbuf);
179 count = zfx->inbufsize - n;
180 nread = iobuf_read( a, zfx->inbuf + n, count );
181 if( nread == -1 ) nread = 0;
183 /* Algo 1 has no zlib header which requires us to to give
184 * inflate an extra dummy byte to read. To be on the safe
185 * side we allow for up to 4 ff bytes. */
186 if( nread < count && zfx->algo == 1 && zfx->algo1hack < 4) {
187 *(zfx->inbuf + n) = 0xFF;
196 log_debug("enter inflate: avail_in=%u, avail_out=%u\n",
197 (unsigned)zs->avail_in, (unsigned)zs->avail_out);
198 zrc = inflate ( zs, Z_SYNC_FLUSH );
200 log_debug("leave inflate: avail_in=%u, avail_out=%u, zrc=%d\n",
201 (unsigned)zs->avail_in, (unsigned)zs->avail_out, zrc);
202 if( zrc == Z_STREAM_END )
204 else if( zrc != Z_OK && zrc != Z_BUF_ERROR ) {
206 log_fatal("zlib inflate problem: %s\n", zs->msg );
208 log_fatal("zlib inflate problem: rc=%d\n", zrc );
210 } while (zs->avail_out && zrc != Z_STREAM_END && zrc != Z_BUF_ERROR
213 *ret_len = zfx->outbufsize - zs->avail_out;
215 log_debug("do_uncompress: returning %u bytes (%u ignored)\n",
216 (unsigned int)*ret_len, (unsigned int)zs->avail_in );
221 compress_filter( void *opaque, int control,
222 IOBUF a, byte *buf, size_t *ret_len)
224 size_t size = *ret_len;
225 compress_filter_context_t *zfx = opaque;
226 z_stream *zs = zfx->opaque;
229 if( control == IOBUFCTRL_UNDERFLOW ) {
231 zs = zfx->opaque = xmalloc_clear( sizeof *zs );
232 init_uncompress( zfx, zs );
236 zs->next_out = BYTEF_CAST (buf);
237 zs->avail_out = size;
238 zfx->outbufsize = size; /* needed only for calculation */
239 rc = do_uncompress( zfx, zs, a, ret_len );
241 else if( control == IOBUFCTRL_FLUSH ) {
245 if(zfx->algo != COMPRESS_ALGO_ZIP
246 && zfx->algo != COMPRESS_ALGO_ZLIB)
248 memset( &cd, 0, sizeof cd );
250 cd.algorithm = zfx->algo;
252 pkt.pkttype = PKT_COMPRESSED;
253 pkt.pkt.compressed = &cd;
254 if( build_packet( a, &pkt ))
255 log_bug("build_packet(PKT_COMPRESSED) failed\n");
256 zs = zfx->opaque = xmalloc_clear( sizeof *zs );
257 init_compress( zfx, zs );
261 zs->next_in = BYTEF_CAST (buf);
263 rc = do_compress( zfx, zs, Z_NO_FLUSH, a );
265 else if( control == IOBUFCTRL_FREE ) {
266 if( zfx->status == 1 ) {
270 xfree(zfx->outbuf); zfx->outbuf = NULL;
272 else if( zfx->status == 2 ) {
273 zs->next_in = BYTEF_CAST (buf);
275 do_compress( zfx, zs, Z_FINISH, a );
279 xfree(zfx->outbuf); zfx->outbuf = NULL;
284 else if( control == IOBUFCTRL_DESC )
285 *(char**)buf = "compress_filter";
291 release_context (compress_filter_context_t *ctx)
297 * Handle a compressed packet
300 handle_compressed( void *procctx, PKT_compressed *cd,
301 int (*callback)(IOBUF, void *), void *passthru )
303 compress_filter_context_t *cfx;
306 if(check_compress_algo(cd->algorithm))
307 return G10ERR_COMPR_ALGO;
308 cfx = xmalloc_clear (sizeof *cfx);
309 cfx->release = release_context;
310 cfx->algo = cd->algorithm;
311 push_compress_filter(cd->buf,cfx,cd->algorithm);
313 rc = callback(cd->buf, passthru );
315 rc = proc_packets(procctx, cd->buf);
321 push_compress_filter(IOBUF out,compress_filter_context_t *zfx,int algo)
323 push_compress_filter2(out,zfx,algo,0);
327 push_compress_filter2(IOBUF out,compress_filter_context_t *zfx,
333 zfx->algo=DEFAULT_COMPRESS_ALGO;
337 case COMPRESS_ALGO_NONE:
340 case COMPRESS_ALGO_ZIP:
341 case COMPRESS_ALGO_ZLIB:
342 iobuf_push_filter2(out,compress_filter,zfx,rel);
346 case COMPRESS_ALGO_BZIP2:
347 iobuf_push_filter2(out,compress_filter_bz2,zfx,rel);