1 /* compress.c - compress filter
2 * Copyright (C) 1998, 1999, 2000, 2001, 2002,
3 * 2003, 2006, 2010 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 */
36 # if defined(__riscos__) && defined(USE_ZLIBRISCOS)
37 # include "zlib-riscos.h"
50 #define BYTEF_CAST(a) ((Bytef *)(a))
52 #define BYTEF_CAST(a) (a)
57 int compress_filter_bz2( void *opaque, int control,
58 IOBUF a, byte *buf, size_t *ret_len);
62 init_compress( compress_filter_context_t *zfx, z_stream *zs )
67 #if defined(__riscos__) && defined(USE_ZLIBRISCOS)
68 static int zlib_initialized = 0;
70 if (!zlib_initialized)
71 zlib_initialized = riscos_load_module("ZLib", zlib_path, 1);
74 if( opt.compress_level >= 1 && opt.compress_level <= 9 )
75 level = opt.compress_level;
76 else if( opt.compress_level == -1 )
77 level = Z_DEFAULT_COMPRESSION;
79 log_error("invalid compression level; using default level\n");
80 level = Z_DEFAULT_COMPRESSION;
83 if( (rc = zfx->algo == 1? deflateInit2( zs, level, Z_DEFLATED,
84 -13, 8, Z_DEFAULT_STRATEGY)
85 : deflateInit( zs, level )
87 log_fatal("zlib problem: %s\n", zs->msg? zs->msg :
88 rc == Z_MEM_ERROR ? "out of core" :
89 rc == Z_VERSION_ERROR ? "invalid lib version" :
93 zfx->outbufsize = 8192;
94 zfx->outbuf = xmalloc( zfx->outbufsize );
98 do_compress( compress_filter_context_t *zfx, z_stream *zs, int flush, IOBUF a )
105 zs->next_out = BYTEF_CAST (zfx->outbuf);
106 zs->avail_out = zfx->outbufsize;
108 log_debug("enter deflate: avail_in=%u, avail_out=%u, flush=%d\n",
109 (unsigned)zs->avail_in, (unsigned)zs->avail_out, flush );
110 zrc = deflate( zs, flush );
111 if( zrc == Z_STREAM_END && flush == Z_FINISH )
113 else if( zrc != Z_OK ) {
115 log_fatal("zlib deflate problem: %s\n", zs->msg );
117 log_fatal("zlib deflate problem: rc=%d\n", zrc );
119 n = zfx->outbufsize - zs->avail_out;
121 log_debug("leave deflate: "
122 "avail_in=%u, avail_out=%u, n=%u, zrc=%d\n",
123 (unsigned)zs->avail_in, (unsigned)zs->avail_out,
126 if( (rc=iobuf_write( a, zfx->outbuf, n )) ) {
127 log_debug("deflate: iobuf_write failed\n");
130 } while( zs->avail_in || (flush == Z_FINISH && zrc != Z_STREAM_END) );
135 init_uncompress( compress_filter_context_t *zfx, z_stream *zs )
140 * PGP uses a windowsize of 13 bits. Using a negative value for
141 * it forces zlib not to expect a zlib header. This is a
142 * undocumented feature Peter Gutmann told me about.
144 * We must use 15 bits for the inflator because CryptoEx uses 15
145 * bits thus the output would get scrambled w/o error indication
146 * if we would use 13 bits. For the uncompressing this does not
149 if( (rc = zfx->algo == 1? inflateInit2( zs, -15)
150 : inflateInit( zs )) != Z_OK ) {
151 log_fatal("zlib problem: %s\n", zs->msg? zs->msg :
152 rc == Z_MEM_ERROR ? "out of core" :
153 rc == Z_VERSION_ERROR ? "invalid lib version" :
157 zfx->inbufsize = 2048;
158 zfx->inbuf = xmalloc( zfx->inbufsize );
163 do_uncompress( compress_filter_context_t *zfx, z_stream *zs,
164 IOBUF a, size_t *ret_len )
171 int refill = !zs->avail_in;
174 log_debug("begin inflate: avail_in=%u, avail_out=%u, inbuf=%u\n",
175 (unsigned)zs->avail_in, (unsigned)zs->avail_out,
176 (unsigned)zfx->inbufsize );
178 if( zs->avail_in < zfx->inbufsize && refill ) {
181 zs->next_in = BYTEF_CAST (zfx->inbuf);
182 count = zfx->inbufsize - n;
183 nread = iobuf_read( a, zfx->inbuf + n, count );
184 if( nread == -1 ) nread = 0;
186 /* Algo 1 has no zlib header which requires us to to give
187 * inflate an extra dummy byte to read. To be on the safe
188 * side we allow for up to 4 ff bytes. */
189 if( nread < count && zfx->algo == 1 && zfx->algo1hack < 4) {
190 *(zfx->inbuf + n) = 0xFF;
199 log_debug("enter inflate: avail_in=%u, avail_out=%u\n",
200 (unsigned)zs->avail_in, (unsigned)zs->avail_out);
201 zrc = inflate ( zs, Z_SYNC_FLUSH );
203 log_debug("leave inflate: avail_in=%u, avail_out=%u, zrc=%d\n",
204 (unsigned)zs->avail_in, (unsigned)zs->avail_out, zrc);
205 if( zrc == Z_STREAM_END )
207 else if( zrc != Z_OK && zrc != Z_BUF_ERROR ) {
209 log_fatal("zlib inflate problem: %s\n", zs->msg );
211 log_fatal("zlib inflate problem: rc=%d\n", zrc );
213 } while (zs->avail_out && zrc != Z_STREAM_END && zrc != Z_BUF_ERROR
216 *ret_len = zfx->outbufsize - zs->avail_out;
218 log_debug("do_uncompress: returning %u bytes (%u ignored)\n",
219 (unsigned int)*ret_len, (unsigned int)zs->avail_in );
224 compress_filter( void *opaque, int control,
225 IOBUF a, byte *buf, size_t *ret_len)
227 size_t size = *ret_len;
228 compress_filter_context_t *zfx = opaque;
229 z_stream *zs = zfx->opaque;
232 if( control == IOBUFCTRL_UNDERFLOW ) {
234 zs = zfx->opaque = xmalloc_clear( sizeof *zs );
235 init_uncompress( zfx, zs );
239 zs->next_out = BYTEF_CAST (buf);
240 zs->avail_out = size;
241 zfx->outbufsize = size; /* needed only for calculation */
242 rc = do_uncompress( zfx, zs, a, ret_len );
244 else if( control == IOBUFCTRL_FLUSH ) {
248 if(zfx->algo != COMPRESS_ALGO_ZIP
249 && zfx->algo != COMPRESS_ALGO_ZLIB)
251 memset( &cd, 0, sizeof cd );
253 cd.algorithm = zfx->algo;
254 /* Fixme: We should force a new CTB here:
255 cd.new_ctb = zfx->new_ctb;
258 pkt.pkttype = PKT_COMPRESSED;
259 pkt.pkt.compressed = &cd;
260 if( build_packet( a, &pkt ))
261 log_bug("build_packet(PKT_COMPRESSED) failed\n");
262 zs = zfx->opaque = xmalloc_clear( sizeof *zs );
263 init_compress( zfx, zs );
267 zs->next_in = BYTEF_CAST (buf);
269 rc = do_compress( zfx, zs, Z_NO_FLUSH, a );
271 else if( control == IOBUFCTRL_FREE ) {
272 if( zfx->status == 1 ) {
276 xfree(zfx->outbuf); zfx->outbuf = NULL;
278 else if( zfx->status == 2 ) {
279 zs->next_in = BYTEF_CAST (buf);
281 do_compress( zfx, zs, Z_FINISH, a );
285 xfree(zfx->outbuf); zfx->outbuf = NULL;
290 else if( control == IOBUFCTRL_DESC )
291 mem2str (buf, "compress_filter", *ret_len);
297 release_context (compress_filter_context_t *ctx)
303 * Handle a compressed packet
306 handle_compressed (ctrl_t ctrl, void *procctx, PKT_compressed *cd,
307 int (*callback)(IOBUF, void *), void *passthru )
309 compress_filter_context_t *cfx;
312 if(check_compress_algo(cd->algorithm))
313 return GPG_ERR_COMPR_ALGO;
314 cfx = xmalloc_clear (sizeof *cfx);
315 cfx->release = release_context;
316 cfx->algo = cd->algorithm;
317 push_compress_filter(cd->buf,cfx,cd->algorithm);
319 rc = callback(cd->buf, passthru );
321 rc = proc_packets (ctrl,procctx, cd->buf);
327 push_compress_filter(IOBUF out,compress_filter_context_t *zfx,int algo)
329 push_compress_filter2(out,zfx,algo,0);
333 push_compress_filter2(IOBUF out,compress_filter_context_t *zfx,
339 zfx->algo=DEFAULT_COMPRESS_ALGO;
343 case COMPRESS_ALGO_NONE:
347 case COMPRESS_ALGO_ZIP:
348 case COMPRESS_ALGO_ZLIB:
349 iobuf_push_filter2(out,compress_filter,zfx,rel);
354 case COMPRESS_ALGO_BZIP2:
355 iobuf_push_filter2(out,compress_filter_bz2,zfx,rel);