Line data Source code
1 : /* compress.c - bzip2 compress filter
2 : * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
3 : *
4 : * This file is part of GnuPG.
5 : *
6 : * GnuPG is free software; you can redistribute it and/or modify
7 : * it under the terms of the GNU General Public License as published by
8 : * the Free Software Foundation; either version 3 of the License, or
9 : * (at your option) any later version.
10 : *
11 : * GnuPG is distributed in the hope that it will be useful,
12 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : * GNU General Public License for more details.
15 : *
16 : * You should have received a copy of the GNU General Public License
17 : * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 : */
19 :
20 : #include <config.h>
21 : #include <string.h>
22 : #include <stdio.h> /* Early versions of bzlib (1.0) require stdio.h */
23 : #include <bzlib.h>
24 :
25 : #include "gpg.h"
26 : #include "util.h"
27 : #include "packet.h"
28 : #include "filter.h"
29 : #include "main.h"
30 : #include "options.h"
31 :
32 : /* Note that the code in compress.c is nearly identical to the code
33 : here, so if you fix a bug here, look there to see if a matching bug
34 : needs to be fixed. I tried to have one set of functions that could
35 : do ZIP, ZLIB, and BZIP2, but it became dangerously unreadable with
36 : #ifdefs and if(algo) -dshaw */
37 :
38 : static void
39 0 : init_compress( compress_filter_context_t *zfx, bz_stream *bzs )
40 : {
41 : int rc;
42 : int level;
43 :
44 0 : if( opt.bz2_compress_level >= 1 && opt.bz2_compress_level <= 9 )
45 0 : level = opt.bz2_compress_level;
46 0 : else if( opt.bz2_compress_level == -1 )
47 0 : level = 6; /* no particular reason, but it seems reasonable */
48 : else
49 : {
50 0 : log_error("invalid compression level; using default level\n");
51 0 : level = 6;
52 : }
53 :
54 0 : if((rc=BZ2_bzCompressInit(bzs,level,0,0))!=BZ_OK)
55 0 : log_fatal("bz2lib problem: %d\n",rc);
56 :
57 0 : zfx->outbufsize = 8192;
58 0 : zfx->outbuf = xmalloc( zfx->outbufsize );
59 0 : }
60 :
61 : static int
62 0 : do_compress(compress_filter_context_t *zfx, bz_stream *bzs, int flush, IOBUF a)
63 : {
64 : int rc;
65 : int zrc;
66 : unsigned n;
67 :
68 : do
69 : {
70 0 : bzs->next_out = zfx->outbuf;
71 0 : bzs->avail_out = zfx->outbufsize;
72 0 : if( DBG_FILTER )
73 0 : log_debug("enter bzCompress: avail_in=%u, avail_out=%u, flush=%d\n",
74 : (unsigned)bzs->avail_in, (unsigned)bzs->avail_out, flush );
75 0 : zrc = BZ2_bzCompress( bzs, flush );
76 0 : if( zrc == BZ_STREAM_END && flush == BZ_FINISH )
77 : ;
78 0 : else if( zrc != BZ_RUN_OK && zrc != BZ_FINISH_OK )
79 0 : log_fatal("bz2lib deflate problem: rc=%d\n", zrc );
80 :
81 0 : n = zfx->outbufsize - bzs->avail_out;
82 0 : if( DBG_FILTER )
83 0 : log_debug("leave bzCompress:"
84 : " avail_in=%u, avail_out=%u, n=%u, zrc=%d\n",
85 : (unsigned)bzs->avail_in, (unsigned)bzs->avail_out,
86 : (unsigned)n, zrc );
87 :
88 0 : if( (rc=iobuf_write( a, zfx->outbuf, n )) )
89 : {
90 0 : log_debug("bzCompress: iobuf_write failed\n");
91 0 : return rc;
92 : }
93 : }
94 0 : while( bzs->avail_in || (flush == BZ_FINISH && zrc != BZ_STREAM_END) );
95 :
96 0 : return 0;
97 : }
98 :
99 : static void
100 1 : init_uncompress( compress_filter_context_t *zfx, bz_stream *bzs )
101 : {
102 : int rc;
103 :
104 1 : if((rc=BZ2_bzDecompressInit(bzs,0,opt.bz2_decompress_lowmem))!=BZ_OK)
105 0 : log_fatal("bz2lib problem: %d\n",rc);
106 :
107 1 : zfx->inbufsize = 2048;
108 1 : zfx->inbuf = xmalloc( zfx->inbufsize );
109 1 : bzs->avail_in = 0;
110 1 : }
111 :
112 : static int
113 524289 : do_uncompress( compress_filter_context_t *zfx, bz_stream *bzs,
114 : IOBUF a, size_t *ret_len )
115 : {
116 : int zrc;
117 524289 : int rc=0;
118 : size_t n;
119 : int nread, count;
120 524289 : int refill = !bzs->avail_in;
121 524289 : int eofseen = 0;
122 :
123 524289 : if( DBG_FILTER )
124 0 : log_debug("begin bzDecompress: avail_in=%u, avail_out=%u, inbuf=%u\n",
125 : (unsigned)bzs->avail_in, (unsigned)bzs->avail_out,
126 : (unsigned)zfx->inbufsize );
127 : do
128 : {
129 524291 : if( bzs->avail_in < zfx->inbufsize && refill )
130 : {
131 3 : n = bzs->avail_in;
132 3 : if( !n )
133 3 : bzs->next_in = zfx->inbuf;
134 3 : count = zfx->inbufsize - n;
135 3 : nread = iobuf_read( a, zfx->inbuf + n, count );
136 3 : if( nread == -1 )
137 : {
138 0 : eofseen = 1;
139 0 : nread = 0;
140 : }
141 3 : n += nread;
142 3 : bzs->avail_in = n;
143 : }
144 524291 : if (!eofseen)
145 524291 : refill = 1;
146 :
147 524291 : if( DBG_FILTER )
148 0 : log_debug("enter bzDecompress: avail_in=%u, avail_out=%u\n",
149 : (unsigned)bzs->avail_in, (unsigned)bzs->avail_out);
150 :
151 524291 : zrc=BZ2_bzDecompress(bzs);
152 524291 : if( DBG_FILTER )
153 0 : log_debug("leave bzDecompress: avail_in=%u, avail_out=%u, zrc=%d\n",
154 : (unsigned)bzs->avail_in, (unsigned)bzs->avail_out, zrc);
155 524291 : if( zrc == BZ_STREAM_END )
156 1 : rc = -1; /* eof */
157 524290 : else if( zrc != BZ_OK && zrc != BZ_PARAM_ERROR )
158 0 : log_fatal("bz2lib inflate problem: rc=%d\n", zrc );
159 524290 : else if (zrc == BZ_OK && eofseen
160 0 : && !bzs->avail_in && bzs->avail_out > 0)
161 : {
162 0 : log_error ("unexpected EOF in bz2lib\n");
163 0 : rc = GPG_ERR_BAD_DATA;
164 0 : break;
165 : }
166 : }
167 524291 : while( bzs->avail_out && zrc != BZ_STREAM_END && zrc != BZ_PARAM_ERROR );
168 :
169 : /* I'm not completely happy with the two uses of BZ_PARAM_ERROR
170 : here. The corresponding zlib function is Z_BUF_ERROR, which
171 : covers a narrower scope than BZ_PARAM_ERROR. -dshaw */
172 :
173 524289 : *ret_len = zfx->outbufsize - bzs->avail_out;
174 524289 : if( DBG_FILTER )
175 0 : log_debug("do_uncompress: returning %u bytes\n", (unsigned)*ret_len );
176 524289 : return rc;
177 : }
178 :
179 : int
180 524291 : compress_filter_bz2( void *opaque, int control,
181 : IOBUF a, byte *buf, size_t *ret_len)
182 : {
183 524291 : size_t size = *ret_len;
184 524291 : compress_filter_context_t *zfx = opaque;
185 524291 : bz_stream *bzs = zfx->opaque;
186 524291 : int rc=0;
187 :
188 524291 : if( control == IOBUFCTRL_UNDERFLOW )
189 : {
190 524289 : if( !zfx->status )
191 : {
192 1 : bzs = zfx->opaque = xmalloc_clear( sizeof *bzs );
193 1 : init_uncompress( zfx, bzs );
194 1 : zfx->status = 1;
195 : }
196 :
197 524289 : bzs->next_out = buf;
198 524289 : bzs->avail_out = size;
199 524289 : zfx->outbufsize = size; /* needed only for calculation */
200 524289 : rc = do_uncompress( zfx, bzs, a, ret_len );
201 : }
202 2 : else if( control == IOBUFCTRL_FLUSH )
203 : {
204 0 : if( !zfx->status )
205 : {
206 : PACKET pkt;
207 : PKT_compressed cd;
208 :
209 0 : if( zfx->algo != COMPRESS_ALGO_BZIP2 )
210 0 : BUG();
211 0 : memset( &cd, 0, sizeof cd );
212 0 : cd.len = 0;
213 0 : cd.algorithm = zfx->algo;
214 0 : init_packet( &pkt );
215 0 : pkt.pkttype = PKT_COMPRESSED;
216 0 : pkt.pkt.compressed = &cd;
217 0 : if( build_packet( a, &pkt ))
218 0 : log_bug("build_packet(PKT_COMPRESSED) failed\n");
219 0 : bzs = zfx->opaque = xmalloc_clear( sizeof *bzs );
220 0 : init_compress( zfx, bzs );
221 0 : zfx->status = 2;
222 : }
223 :
224 0 : bzs->next_in = buf;
225 0 : bzs->avail_in = size;
226 0 : rc = do_compress( zfx, bzs, BZ_RUN, a );
227 : }
228 2 : else if( control == IOBUFCTRL_FREE )
229 : {
230 1 : if( zfx->status == 1 )
231 : {
232 1 : BZ2_bzDecompressEnd(bzs);
233 1 : xfree(bzs);
234 1 : zfx->opaque = NULL;
235 1 : xfree(zfx->outbuf); zfx->outbuf = NULL;
236 : }
237 0 : else if( zfx->status == 2 )
238 : {
239 0 : bzs->next_in = buf;
240 0 : bzs->avail_in = 0;
241 0 : do_compress( zfx, bzs, BZ_FINISH, a );
242 0 : BZ2_bzCompressEnd(bzs);
243 0 : xfree(bzs);
244 0 : zfx->opaque = NULL;
245 0 : xfree(zfx->outbuf); zfx->outbuf = NULL;
246 : }
247 1 : if (zfx->release)
248 1 : zfx->release (zfx);
249 : }
250 1 : else if( control == IOBUFCTRL_DESC )
251 0 : *(char**)buf = "compress_filter";
252 524291 : return rc;
253 : }
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