2 * Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
4 * This file uses bzip2 library code which is written
5 * by Julian Seward <jseward@bzip.org>.
6 * See README and LICENSE files in bz/ directory for more information
7 * about bzip2 library code.
11 #include "unarchive.h"
13 #define CONFIG_BZIP2_FEATURE_SPEED 1
16 * Compiled with gcc 4.2.1, run on Athlon 64 1800 MHz (512K L2 cache).
17 * Stock bzip2 is 26.4% slower than bbox bzip2 at SPEED 1
18 * (time to compress gcc-4.2.1.tar is 126.4% compared to bbox).
19 * At SPEED 5 difference is 32.7%.
21 * Test run of all CONFIG_BZIP2_FEATURE_SPEED values on a 11Mb text file:
23 * 0: 10828 4.145 4.146 4.148
24 * 1: 11097 3.845 3.860 3.861
25 * 2: 11392 3.763 3.767 3.768
26 * 3: 11892 3.722 3.724 3.727
27 * 4: 12740 3.637 3.640 3.644
28 * 5: 17273 3.497 3.509 3.509
33 /* Takes ~300 bytes, detects corruption caused by bad RAM etc */
34 #define BZ_LIGHT_DEBUG 0
38 #include "bz/bzlib_private.h"
40 #include "bz/blocksort.c"
42 #include "bz/compress.c"
43 #include "bz/huffman.c"
45 /* No point in being shy and having very small buffer here.
46 * bzip2 internal buffers are much bigger anyway, hundreds of kbytes.
47 * If iobuf is several pages long, malloc() may use mmap,
48 * making iobuf is page aligned and thus (maybe) have one memcpy less
49 * if kernel is clever enough.
57 /* NB: compressStream() has to return -1 on errors, not die.
58 * bbunpack() will correctly clean up in this case
59 * (delete incomplete .bz2 file)
64 * total written bytes so far otherwise
67 USE_DESKTOP(long long) int bz_write(bz_stream *strm, void* rbuf, ssize_t rlen, void *wbuf)
71 strm->avail_in = rlen;
74 strm->avail_out = IOBUF_SIZE;
75 strm->next_out = wbuf;
77 ret = BZ2_bzCompress(strm, rlen ? BZ_RUN : BZ_FINISH);
78 if (ret != BZ_RUN_OK /* BZ_RUNning */
79 && ret != BZ_FINISH_OK /* BZ_FINISHing, but not done yet */
80 && ret != BZ_STREAM_END /* BZ_FINISHed */
82 bb_error_msg_and_die("internal error %d", ret);
85 n = IOBUF_SIZE - strm->avail_out;
87 n2 = full_write(STDOUT_FILENO, wbuf, n);
90 errno = 0; /* prevent bogus error message */
91 bb_perror_msg(n2 >= 0 ? "short write" : "write error");
96 if (ret == BZ_STREAM_END)
98 if (rlen && strm->avail_in == 0)
101 return 0 USE_DESKTOP( + strm->total_out );
105 USE_DESKTOP(long long) int compressStream(unpack_info_t *info UNUSED_PARAM)
107 USE_DESKTOP(long long) int total;
109 bz_stream bzs; /* it's small */
113 #define wbuf (iobuf + IOBUF_SIZE)
115 iobuf = xmalloc(2 * IOBUF_SIZE);
116 BZ2_bzCompressInit(strm, level);
119 count = full_read(STDIN_FILENO, rbuf, IOBUF_SIZE);
121 bb_perror_msg("read error");
125 /* if count == 0, bz_write finalizes compression */
126 total = bz_write(strm, rbuf, count, wbuf);
127 if (count == 0 || total < 0)
131 #if ENABLE_FEATURE_CLEAN_UP
132 BZ2_bzCompressEnd(strm);
139 char* make_new_name_bzip2(char *filename)
141 return xasprintf("%s.bz2", filename);
144 int bzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
145 int bzip2_main(int argc UNUSED_PARAM, char **argv)
149 /* standard bzip2 flags
150 * -d --decompress force decompression
151 * -z --compress force compression
152 * -k --keep keep (don't delete) input files
153 * -f --force overwrite existing output files
154 * -t --test test compressed file integrity
155 * -c --stdout output to standard out
156 * -q --quiet suppress noncritical error messages
157 * -v --verbose be verbose (a 2nd -v gives more)
158 * -s --small use less memory (at most 2500k)
159 * -1 .. -9 set block size to 100k .. 900k
160 * --fast alias for -1
161 * --best alias for -9
164 opt_complementary = "s2"; /* -s means -2 (compatibility) */
165 /* Must match bbunzip's constants OPT_STDOUT, OPT_FORCE! */
166 opt = getopt32(argv, "cfv" USE_BUNZIP2("dt") "123456789qzs");
167 #if ENABLE_BUNZIP2 /* bunzip2_main may not be visible... */
168 if (opt & 0x18) // -d and/or -t
169 return bunzip2_main(argc, argv);
174 opt = (uint8_t)opt; /* isolate bits for -1..-8 */
175 opt |= 0x100; /* if nothing else, assume -9 */
183 option_mask32 &= 0x7; /* ignore all except -cfv */
184 return bbunpack(argv, make_new_name_bzip2, compressStream);