1 gzip: fix compression level bug. Closes 9131
2 fix broken logic to get the gzip_level_config value from options -1 to
5 This fixes an off-by-one bug that caused gzip -9 output bigger files
6 than the other compression levels.
8 It fixes so that compression level 1 to 3 are actually mapped to level 4
11 It also fixes that levels -4 to -9 is mapped to correct level and avoids
14 Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
15 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
19 @@ -2220,10 +2220,7 @@ int gzip_main(int argc UNUSED_PARAM, cha
20 opt >>= ENABLE_GUNZIP ? 7 : 5; /* drop cfv[dt]qn bits */
22 opt = 1 << 6; /* default: 6 */
26 - opt = ffs(opt >> 3);
27 + opt = ffs(opt >> 4); /* Maps -1..-4 to [0], -5 to [1] ... -9 to [5] */
28 max_chain_length = 1 << gzip_level_config[opt].chain_shift;
29 good_match = gzip_level_config[opt].good;
30 max_lazy_match = gzip_level_config[opt].lazy2 * 2;