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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-09-05 13:22:24 +0200
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-09-05 13:26:58 +0200
commit750137ef7ce3d21511b4638d25a4fce0a811b60a (patch)
tree6082e157a2721af0165b4f07ffdda6b34c0a0547 /archival/gzip.c
parentc660cc1b7714fffbac95c9378ff4b73de650a6de (diff)
downloadbusybox-750137ef7ce3d21511b4638d25a4fce0a811b60a.tar.gz
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gzip: code shrink
function old new delta gzip_main 267 264 -3 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/gzip.c')
-rw-r--r--archival/gzip.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/archival/gzip.c b/archival/gzip.c
index b08e60efd..3966a06b4 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;