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 //config: bool "bzip2"
14 //config: bzip2 is a compression utility using the Burrows-Wheeler block
15 //config: sorting text compression algorithm, and Huffman coding. Compression
16 //config: is generally considerably better than that achieved by more
17 //config: conventional LZ77/LZ78-based compressors, and approaches the
18 //config: performance of the PPM family of statistical compressors.
20 //config: Unless you have a specific application which requires bzip2, you
21 //config: should probably say N here.
23 //config:config FEATURE_BZIP2_DECOMPRESS
24 //config: bool "Enable decompression"
26 //config: depends on BZIP2 || BUNZIP2 || BZCAT
28 //config: Enable -d (--decompress) and -t (--test) options for bzip2.
29 //config: This will be automatically selected if bunzip2 or bzcat is
32 //applet:IF_BZIP2(APPLET(bzip2, BB_DIR_USR_BIN, BB_SUID_DROP))
33 //kbuild:lib-$(CONFIG_BZIP2) += bzip2.o
35 //usage:#define bzip2_trivial_usage
36 //usage: "[OPTIONS] [FILE]..."
37 //usage:#define bzip2_full_usage "\n\n"
38 //usage: "Compress FILEs (or stdin) with bzip2 algorithm\n"
39 //usage: "\n -1..9 Compression level"
40 //usage: IF_FEATURE_BZIP2_DECOMPRESS(
41 //usage: "\n -d Decompress"
42 //usage: "\n -t Test file integrity"
44 //usage: "\n -c Write to stdout"
45 //usage: "\n -f Force"
48 #include "bb_archive.h"
50 #define CONFIG_BZIP2_FAST 1
53 * Compiled with gcc 4.2.1, run on Athlon 64 1800 MHz (512K L2 cache).
54 * Stock bzip2 is 26.4% slower than bbox bzip2 at SPEED 1
55 * (time to compress gcc-4.2.1.tar is 126.4% compared to bbox).
56 * At SPEED 5 difference is 32.7%.
58 * Test run of all CONFIG_BZIP2_FAST values on a 11Mb text file:
60 * 0: 10828 4.145 4.146 4.148
61 * 1: 11097 3.845 3.860 3.861
62 * 2: 11392 3.763 3.767 3.768
63 * 3: 11892 3.722 3.724 3.727
64 * 4: 12740 3.637 3.640 3.644
65 * 5: 17273 3.497 3.509 3.509
70 /* Takes ~300 bytes, detects corruption caused by bad RAM etc */
71 #define BZ_LIGHT_DEBUG 0
73 #include "libarchive/bz/bzlib.h"
75 #include "libarchive/bz/bzlib_private.h"
77 #include "libarchive/bz/blocksort.c"
78 #include "libarchive/bz/bzlib.c"
79 #include "libarchive/bz/compress.c"
80 #include "libarchive/bz/huffman.c"
82 /* No point in being shy and having very small buffer here.
83 * bzip2 internal buffers are much bigger anyway, hundreds of kbytes.
84 * If iobuf is several pages long, malloc() may use mmap,
85 * making iobuf is page aligned and thus (maybe) have one memcpy less
86 * if kernel is clever enough.
94 /* NB: compressStream() has to return -1 on errors, not die.
95 * bbunpack() will correctly clean up in this case
96 * (delete incomplete .bz2 file)
101 * total written bytes so far otherwise
104 IF_DESKTOP(long long) int bz_write(bz_stream *strm, void* rbuf, ssize_t rlen, void *wbuf)
108 strm->avail_in = rlen;
109 strm->next_in = rbuf;
111 strm->avail_out = IOBUF_SIZE;
112 strm->next_out = wbuf;
114 ret = BZ2_bzCompress(strm, rlen ? BZ_RUN : BZ_FINISH);
115 if (ret != BZ_RUN_OK /* BZ_RUNning */
116 && ret != BZ_FINISH_OK /* BZ_FINISHing, but not done yet */
117 && ret != BZ_STREAM_END /* BZ_FINISHed */
119 bb_error_msg_and_die("internal error %d", ret);
122 n = IOBUF_SIZE - strm->avail_out;
124 n2 = full_write(STDOUT_FILENO, wbuf, n);
127 errno = 0; /* prevent bogus error message */
128 bb_perror_msg(n2 >= 0 ? "short write" : bb_msg_write_error);
133 if (ret == BZ_STREAM_END)
135 if (rlen && strm->avail_in == 0)
138 return 0 IF_DESKTOP( + strm->total_out );
142 IF_DESKTOP(long long) int FAST_FUNC compressStream(transformer_state_t *xstate UNUSED_PARAM)
144 IF_DESKTOP(long long) int total;
146 bz_stream bzs; /* it's small */
150 #define wbuf (iobuf + IOBUF_SIZE)
152 iobuf = xmalloc(2 * IOBUF_SIZE);
153 BZ2_bzCompressInit(strm, level);
156 count = full_read(STDIN_FILENO, rbuf, IOBUF_SIZE);
158 bb_perror_msg(bb_msg_read_error);
162 /* if count == 0, bz_write finalizes compression */
163 total = bz_write(strm, rbuf, count, wbuf);
164 if (count == 0 || total < 0)
168 /* Can't be conditional on ENABLE_FEATURE_CLEAN_UP -
169 * we are called repeatedly
171 BZ2_bzCompressEnd(strm);
177 int bzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
178 int bzip2_main(int argc UNUSED_PARAM, char **argv)
182 /* standard bzip2 flags
183 * -d --decompress force decompression
184 * -z --compress force compression
185 * -k --keep keep (don't delete) input files
186 * -f --force overwrite existing output files
187 * -t --test test compressed file integrity
188 * -c --stdout output to standard out
189 * -q --quiet suppress noncritical error messages
190 * -v --verbose be verbose (a 2nd -v gives more)
191 * -s --small use less memory (at most 2500k)
192 * -1 .. -9 set block size to 100k .. 900k
193 * --fast alias for -1
194 * --best alias for -9
197 opt_complementary = "s2"; /* -s means -2 (compatibility) */
198 /* Must match bbunzip's constants OPT_STDOUT, OPT_FORCE! */
199 opt = getopt32(argv, "cfv" IF_FEATURE_BZIP2_DECOMPRESS("dt") "123456789qzs");
200 #if ENABLE_FEATURE_BZIP2_DECOMPRESS /* bunzip2_main may not be visible... */
201 if (opt & 0x18) // -d and/or -t
202 return bunzip2_main(argc, argv);
207 opt = (uint8_t)opt; /* isolate bits for -1..-8 */
208 opt |= 0x100; /* if nothing else, assume -9 */
216 option_mask32 &= 0x7; /* ignore all except -cfv */
217 return bbunpack(argv, compressStream, append_ext, "bz2");