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| author | Denis Vlasenko | 2007-10-14 00:43:01 +0000 |
|---|---|---|
| committer | Denis Vlasenko | 2007-10-14 00:43:01 +0000 |
| commit | ef3aabe906a351f0bdf97199b4f38a2c6b54eaa5 (patch) | |
| tree | 7ce8c73be864396eb656c2ef59ef797824a07942 /archival/bzip2.c | |
| parent | 77f1ec1b9bf100e6c10aa0856c7156e321511785 (diff) | |
| download | busybox-ef3aabe906a351f0bdf97199b4f38a2c6b54eaa5.zip busybox-ef3aabe906a351f0bdf97199b4f38a2c6b54eaa5.tar.gz | |
bzip2: size reduction, to just below 9k.
Diffstat (limited to 'archival/bzip2.c')
| -rw-r--r-- | archival/bzip2.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/archival/bzip2.c b/archival/bzip2.c index 04478ee..bb1610e 100644 --- a/archival/bzip2.c +++ b/archival/bzip2.c @@ -9,8 +9,28 @@ #include "libbb.h" -/* This buys 6% speed for nearly 4k code */ -/*#define FAST_GROUP6 1*/ +#define CONFIG_BZIP2_FEATURE_SPEED 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_FEATURE_SPEED 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 "bz/bzlib.h" @@ -19,9 +39,7 @@ #include "bz/blocksort.c" #include "bz/bzlib.c" #include "bz/compress.c" -#include "bz/crctable.c" #include "bz/huffman.c" -#include "bz/randtable.c" /* No point in being shy and having very small buffer here. * bzip2 internal buffers are much bigger anyway, hundreds of kbytes. @@ -36,7 +54,7 @@ enum { /* Returns: * <0 on write errors (examine errno), * >0 on short writes (errno == 0) - * 0 no error (entire input consume, gimme more) + * 0 no error (entire input consumed, gimme more) * on "impossible" errors (internal bzip2 compressor bug) dies */ static @@ -44,8 +62,6 @@ ssize_t bz_write(bz_stream *strm, void* rbuf, ssize_t rlen, void *wbuf) { int n, n2, ret; - /* if (len == 0) return 0; */ - strm->avail_in = rlen; strm->next_in = rbuf; while (1) { |