1 /* compress.c - bzip2 compress filter
2 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
4 * This file is part of GnuPG.
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.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <https://www.gnu.org/licenses/>.
22 #include <stdio.h> /* Early versions of bzlib (1.0) require stdio.h */
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 */
39 init_compress( compress_filter_context_t *zfx, bz_stream *bzs )
44 if( opt.bz2_compress_level >= 1 && opt.bz2_compress_level <= 9 )
45 level = opt.bz2_compress_level;
46 else if( opt.bz2_compress_level == -1 )
47 level = 6; /* no particular reason, but it seems reasonable */
50 log_error("invalid compression level; using default level\n");
54 if((rc=BZ2_bzCompressInit(bzs,level,0,0))!=BZ_OK)
55 log_fatal("bz2lib problem: %d\n",rc);
57 zfx->outbufsize = 8192;
58 zfx->outbuf = xmalloc( zfx->outbufsize );
62 do_compress(compress_filter_context_t *zfx, bz_stream *bzs, int flush, IOBUF a)
70 bzs->next_out = zfx->outbuf;
71 bzs->avail_out = zfx->outbufsize;
73 log_debug("enter bzCompress: avail_in=%u, avail_out=%u, flush=%d\n",
74 (unsigned)bzs->avail_in, (unsigned)bzs->avail_out, flush );
75 zrc = BZ2_bzCompress( bzs, flush );
76 if( zrc == BZ_STREAM_END && flush == BZ_FINISH )
78 else if( zrc != BZ_RUN_OK && zrc != BZ_FINISH_OK )
79 log_fatal("bz2lib deflate problem: rc=%d\n", zrc );
81 n = zfx->outbufsize - bzs->avail_out;
83 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,
88 if( (rc=iobuf_write( a, zfx->outbuf, n )) )
90 log_debug("bzCompress: iobuf_write failed\n");
94 while( bzs->avail_in || (flush == BZ_FINISH && zrc != BZ_STREAM_END) );
100 init_uncompress( compress_filter_context_t *zfx, bz_stream *bzs )
104 if((rc=BZ2_bzDecompressInit(bzs,0,opt.bz2_decompress_lowmem))!=BZ_OK)
105 log_fatal("bz2lib problem: %d\n",rc);
107 zfx->inbufsize = 2048;
108 zfx->inbuf = xmalloc( zfx->inbufsize );
113 do_uncompress( compress_filter_context_t *zfx, bz_stream *bzs,
114 IOBUF a, size_t *ret_len )
120 int refill = !bzs->avail_in;
124 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 );
129 if( bzs->avail_in < zfx->inbufsize && refill )
133 bzs->next_in = zfx->inbuf;
134 count = zfx->inbufsize - n;
135 nread = iobuf_read( a, zfx->inbuf + n, count );
148 log_debug("enter bzDecompress: avail_in=%u, avail_out=%u\n",
149 (unsigned)bzs->avail_in, (unsigned)bzs->avail_out);
151 zrc=BZ2_bzDecompress(bzs);
153 log_debug("leave bzDecompress: avail_in=%u, avail_out=%u, zrc=%d\n",
154 (unsigned)bzs->avail_in, (unsigned)bzs->avail_out, zrc);
155 if( zrc == BZ_STREAM_END )
157 else if( zrc != BZ_OK && zrc != BZ_PARAM_ERROR )
158 log_fatal("bz2lib inflate problem: rc=%d\n", zrc );
159 else if (zrc == BZ_OK && eofseen
160 && !bzs->avail_in && bzs->avail_out > 0)
162 log_error ("unexpected EOF in bz2lib\n");
163 rc = GPG_ERR_BAD_DATA;
167 while( bzs->avail_out && zrc != BZ_STREAM_END && zrc != BZ_PARAM_ERROR );
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 */
173 *ret_len = zfx->outbufsize - bzs->avail_out;
175 log_debug("do_uncompress: returning %u bytes\n", (unsigned)*ret_len );
180 compress_filter_bz2( void *opaque, int control,
181 IOBUF a, byte *buf, size_t *ret_len)
183 size_t size = *ret_len;
184 compress_filter_context_t *zfx = opaque;
185 bz_stream *bzs = zfx->opaque;
188 if( control == IOBUFCTRL_UNDERFLOW )
192 bzs = zfx->opaque = xmalloc_clear( sizeof *bzs );
193 init_uncompress( zfx, bzs );
198 bzs->avail_out = size;
199 zfx->outbufsize = size; /* needed only for calculation */
200 rc = do_uncompress( zfx, bzs, a, ret_len );
202 else if( control == IOBUFCTRL_FLUSH )
209 if( zfx->algo != COMPRESS_ALGO_BZIP2 )
211 memset( &cd, 0, sizeof cd );
213 cd.algorithm = zfx->algo;
215 pkt.pkttype = PKT_COMPRESSED;
216 pkt.pkt.compressed = &cd;
217 if( build_packet( a, &pkt ))
218 log_bug("build_packet(PKT_COMPRESSED) failed\n");
219 bzs = zfx->opaque = xmalloc_clear( sizeof *bzs );
220 init_compress( zfx, bzs );
225 bzs->avail_in = size;
226 rc = do_compress( zfx, bzs, BZ_RUN, a );
228 else if( control == IOBUFCTRL_FREE )
230 if( zfx->status == 1 )
232 BZ2_bzDecompressEnd(bzs);
235 xfree(zfx->outbuf); zfx->outbuf = NULL;
237 else if( zfx->status == 2 )
241 do_compress( zfx, bzs, BZ_FINISH, a );
242 BZ2_bzCompressEnd(bzs);
245 xfree(zfx->outbuf); zfx->outbuf = NULL;
250 else if( control == IOBUFCTRL_DESC )
251 mem2str (buf, "compress_filter", *ret_len);