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| author | Denys Vlasenko | 2019-09-05 13:22:24 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2019-09-05 13:26:58 +0200 |
| commit | 750137ef7ce3d21511b4638d25a4fce0a811b60a (patch) | |
| tree | 6082e157a2721af0165b4f07ffdda6b34c0a0547 | |
| parent | c660cc1b7714fffbac95c9378ff4b73de650a6de (diff) | |
| download | busybox-750137ef7ce3d21511b4638d25a4fce0a811b60a.zip busybox-750137ef7ce3d21511b4638d25a4fce0a811b60a.tar.gz | |
gzip: code shrink
function old new delta
gzip_main 267 264 -3
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | archival/gzip.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/archival/gzip.c b/archival/gzip.c index b08e60e..3966a06 100644 --- a/archival/gzip.c +++ b/archival/gzip.c @@ -259,7 +259,7 @@ enum { #if !ENABLE_FEATURE_GZIP_LEVELS - comp_level = 6, + comp_level_minus4 = 6 - 4, max_chain_length = 128, /* To speed up deflation, hash chains are never searched beyond this length. * A higher limit improves compression ratio but degrades the speed. @@ -335,16 +335,16 @@ struct globals { #define head (G1.prev + WSIZE) /* hash head (see deflate.c) */ #if ENABLE_FEATURE_GZIP_LEVELS - unsigned comp_level; + unsigned comp_level_minus4; /* can be a byte */ unsigned max_chain_length; unsigned max_lazy_match; unsigned good_match; unsigned nice_match; -#define comp_level (G1.comp_level) -#define max_chain_length (G1.max_chain_length) -#define max_lazy_match (G1.max_lazy_match) -#define good_match (G1.good_match) -#define nice_match (G1.nice_match) +#define comp_level_minus4 (G1.comp_level_minus4) +#define max_chain_length (G1.max_chain_length) +#define max_lazy_match (G1.max_lazy_match) +#define good_match (G1.good_match) +#define nice_match (G1.nice_match) #endif /* =========================================================================== */ @@ -2082,7 +2082,7 @@ static void zip(void) deflate_flags = 0x300; /* extra flags. OS id = 3 (Unix) */ #if ENABLE_FEATURE_GZIP_LEVELS /* Note that comp_level < 4 do not exist in this version of gzip */ - if (comp_level == 9) { + if (comp_level_minus4 == 9 - 4) { deflate_flags |= 0x02; /* SLOW flag */ } #endif @@ -2232,7 +2232,7 @@ int gzip_main(int argc UNUSED_PARAM, char **argv) opt = 1 << 5; /* default: 6 */ opt = ffs(opt >> 4); /* Maps -1..-4 to [0], -5 to [1] ... -9 to [5] */ - comp_level = opt + 4; + comp_level_minus4 = opt; max_chain_length = 1 << gzip_level_config[opt].chain_shift; good_match = gzip_level_config[opt].good; |