| /* |
| * Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com> |
| * |
| * This file uses bzip2 library code which is written |
| * by Julian Seward <jseward@bzip.org>. |
| * See README and LICENSE files in bz/ directory for more information |
| * about bzip2 library code. |
| */ |
| |
| //config:config BZIP2 |
| //config: bool "bzip2" |
| //config: default y |
| //config: help |
| //config: bzip2 is a compression utility using the Burrows-Wheeler block |
| //config: sorting text compression algorithm, and Huffman coding. Compression |
| //config: is generally considerably better than that achieved by more |
| //config: conventional LZ77/LZ78-based compressors, and approaches the |
| //config: performance of the PPM family of statistical compressors. |
| //config: |
| //config: Unless you have a specific application which requires bzip2, you |
| //config: should probably say N here. |
| //config: |
| //config:config FEATURE_BZIP2_DECOMPRESS |
| //config: bool "Enable decompression" |
| //config: default y |
| //config: depends on BZIP2 || BUNZIP2 || BZCAT |
| //config: help |
| //config: Enable -d (--decompress) and -t (--test) options for bzip2. |
| //config: This will be automatically selected if bunzip2 or bzcat is |
| //config: enabled. |
| |
| //applet:IF_BZIP2(APPLET(bzip2, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| //kbuild:lib-$(CONFIG_BZIP2) += bzip2.o |
| |
| //usage:#define bzip2_trivial_usage |
| //usage: "[OPTIONS] [FILE]..." |
| //usage:#define bzip2_full_usage "\n\n" |
| //usage: "Compress FILEs (or stdin) with bzip2 algorithm\n" |
| //usage: "\n -1..9 Compression level" |
| //usage: IF_FEATURE_BZIP2_DECOMPRESS( |
| //usage: "\n -d Decompress" |
| //usage: "\n -t Test file integrity" |
| //usage: ) |
| //usage: "\n -c Write to stdout" |
| //usage: "\n -f Force" |
| |
| #include "libbb.h" |
| #include "bb_archive.h" |
| |
| #define CONFIG_BZIP2_FAST 1 |
| |
| /* Speed test: |
| * Compiled with gcc 4.2.1, run on Athlon 64 1800 MHz (512K L2 cache). |
| * Stock bzip2 is 26.4% slower than bbox bzip2 at SPEED 1 |
| * (time to compress gcc-4.2.1.tar is 126.4% compared to bbox). |
| * At SPEED 5 difference is 32.7%. |
| * |
| * Test run of all CONFIG_BZIP2_FAST values on a 11Mb text file: |
| * Size Time (3 runs) |
| * 0: 10828 4.145 4.146 4.148 |
| * 1: 11097 3.845 3.860 3.861 |
| * 2: 11392 3.763 3.767 3.768 |
| * 3: 11892 3.722 3.724 3.727 |
| * 4: 12740 3.637 3.640 3.644 |
| * 5: 17273 3.497 3.509 3.509 |
| */ |
| |
| |
| #define BZ_DEBUG 0 |
| /* Takes ~300 bytes, detects corruption caused by bad RAM etc */ |
| #define BZ_LIGHT_DEBUG 0 |
| |
| #include "libarchive/bz/bzlib.h" |
| |
| #include "libarchive/bz/bzlib_private.h" |
| |
| #include "libarchive/bz/blocksort.c" |
| #include "libarchive/bz/bzlib.c" |
| #include "libarchive/bz/compress.c" |
| #include "libarchive/bz/huffman.c" |
| |
| /* No point in being shy and having very small buffer here. |
| * bzip2 internal buffers are much bigger anyway, hundreds of kbytes. |
| * If iobuf is several pages long, malloc() may use mmap, |
| * making iobuf is page aligned and thus (maybe) have one memcpy less |
| * if kernel is clever enough. |
| */ |
| enum { |
| IOBUF_SIZE = 8 * 1024 |
| }; |
| |
| static uint8_t level; |
| |
| /* NB: compressStream() has to return -1 on errors, not die. |
| * bbunpack() will correctly clean up in this case |
| * (delete incomplete .bz2 file) |
| */ |
| |
| /* Returns: |
| * -1 on errors |
| * total written bytes so far otherwise |
| */ |
| static |
| IF_DESKTOP(long long) int bz_write(bz_stream *strm, void* rbuf, ssize_t rlen, void *wbuf) |
| { |
| int n, n2, ret; |
| |
| strm->avail_in = rlen; |
| strm->next_in = rbuf; |
| while (1) { |
| strm->avail_out = IOBUF_SIZE; |
| strm->next_out = wbuf; |
| |
| ret = BZ2_bzCompress(strm, rlen ? BZ_RUN : BZ_FINISH); |
| if (ret != BZ_RUN_OK /* BZ_RUNning */ |
| && ret != BZ_FINISH_OK /* BZ_FINISHing, but not done yet */ |
| && ret != BZ_STREAM_END /* BZ_FINISHed */ |
| ) { |
| bb_error_msg_and_die("internal error %d", ret); |
| } |
| |
| n = IOBUF_SIZE - strm->avail_out; |
| if (n) { |
| n2 = full_write(STDOUT_FILENO, wbuf, n); |
| if (n2 != n) { |
| if (n2 >= 0) |
| errno = 0; /* prevent bogus error message */ |
| bb_perror_msg(n2 >= 0 ? "short write" : bb_msg_write_error); |
| return -1; |
| } |
| } |
| |
| if (ret == BZ_STREAM_END) |
| break; |
| if (rlen && strm->avail_in == 0) |
| break; |
| } |
| return 0 IF_DESKTOP( + strm->total_out ); |
| } |
| |
| static |
| IF_DESKTOP(long long) int FAST_FUNC compressStream(transformer_state_t *xstate UNUSED_PARAM) |
| { |
| IF_DESKTOP(long long) int total; |
| ssize_t count; |
| bz_stream bzs; /* it's small */ |
| #define strm (&bzs) |
| char *iobuf; |
| #define rbuf iobuf |
| #define wbuf (iobuf + IOBUF_SIZE) |
| |
| iobuf = xmalloc(2 * IOBUF_SIZE); |
| BZ2_bzCompressInit(strm, level); |
| |
| while (1) { |
| count = full_read(STDIN_FILENO, rbuf, IOBUF_SIZE); |
| if (count < 0) { |
| bb_perror_msg(bb_msg_read_error); |
| total = -1; |
| break; |
| } |
| /* if count == 0, bz_write finalizes compression */ |
| total = bz_write(strm, rbuf, count, wbuf); |
| if (count == 0 || total < 0) |
| break; |
| } |
| |
| /* Can't be conditional on ENABLE_FEATURE_CLEAN_UP - |
| * we are called repeatedly |
| */ |
| BZ2_bzCompressEnd(strm); |
| free(iobuf); |
| |
| return total; |
| } |
| |
| int bzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int bzip2_main(int argc UNUSED_PARAM, char **argv) |
| { |
| unsigned opt; |
| |
| /* standard bzip2 flags |
| * -d --decompress force decompression |
| * -z --compress force compression |
| * -k --keep keep (don't delete) input files |
| * -f --force overwrite existing output files |
| * -t --test test compressed file integrity |
| * -c --stdout output to standard out |
| * -q --quiet suppress noncritical error messages |
| * -v --verbose be verbose (a 2nd -v gives more) |
| * -s --small use less memory (at most 2500k) |
| * -1 .. -9 set block size to 100k .. 900k |
| * --fast alias for -1 |
| * --best alias for -9 |
| */ |
| |
| opt_complementary = "s2"; /* -s means -2 (compatibility) */ |
| /* Must match bbunzip's constants OPT_STDOUT, OPT_FORCE! */ |
| opt = getopt32(argv, "cfv" IF_FEATURE_BZIP2_DECOMPRESS("dt") "123456789qzs"); |
| #if ENABLE_FEATURE_BZIP2_DECOMPRESS /* bunzip2_main may not be visible... */ |
| if (opt & 0x18) // -d and/or -t |
| return bunzip2_main(argc, argv); |
| opt >>= 5; |
| #else |
| opt >>= 3; |
| #endif |
| opt = (uint8_t)opt; /* isolate bits for -1..-8 */ |
| opt |= 0x100; /* if nothing else, assume -9 */ |
| level = 1; |
| while (!(opt & 1)) { |
| level++; |
| opt >>= 1; |
| } |
| |
| argv += optind; |
| option_mask32 &= 0x7; /* ignore all except -cfv */ |
| return bbunpack(argv, compressStream, append_ext, "bz2"); |
| } |