c660cc1b7
Daniel Edgecumbe
2019-09-05
Subject
gzip: set default compression level to 6 when CONFIG_FEATURE_GZIP_LEVELS=n
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Commit Diff GitHub →
archival/gzip.c+6 -6
| @@ -52,7 +52,7 @@ aa: 85.1% -- replaced with aa.gz | |
| //config: help | |
| //config: Enable support for compression levels 4-9. The default level | |
| //config: is 6. If levels 1-3 are specified, 4 is used. | |
| - | //config: If this option is not selected, -N options are ignored and -9 |
| + | //config: If this option is not selected, -N options are ignored and -6 |
| //config: is used. | |
| //config: | |
| //config:config FEATURE_GZIP_DECOMPRESS | |
| @@ -259,13 +259,13 @@ enum { | |
| #if !ENABLE_FEATURE_GZIP_LEVELS | |
| - | comp_level = 9, |
| - | max_chain_length = 4096, |
| + | comp_level = 6, |
| + | 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. | |
| */ | |
| - | max_lazy_match = 258, |
| + | max_lazy_match = 16, |
| /* Attempt to find a better match only when the current match is strictly | |
| * smaller than this value. This mechanism is used only for compression | |
| * levels >= 4. | |
| @@ -277,7 +277,7 @@ enum { | |
| * max_insert_length is used only for compression levels <= 3. | |
| */ | |
| - | good_match = 32, |
| + | good_match = 8, |
| /* Use a faster search when the previous match is longer than this */ | |
| /* Values for max_lazy_match, good_match and max_chain_length, depending on | |
| @@ -286,7 +286,7 @@ enum { | |
| * found for specific files. | |
| */ | |
| - | nice_match = 258, /* Stop searching when current match exceeds this */ |
| + | nice_match = 128, /* Stop searching when current match exceeds this */ |
| /* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4 | |
| * For deflate_fast() (levels <= 3) good is ignored and lazy has a different | |
| * meaning. | |