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| author | Hans Kristian Rosbach <hk-git@circlestorm.org> | 2019-11-01 11:47:50 +0100 |
|---|---|---|
| committer | Hans Kristian Rosbach <hk-github@circlestorm.org> | 2020-03-18 11:04:05 +0100 |
| commit | 3f21e5071f33bc0ff6e94d5fa0ecf398d6e3fcc3 (patch) | |
| tree | 9e14eb562162c336ac5afce8067314015e5bc0b1 /deflate_medium.c | |
| parent | 4c1cf4f10456316ed8d03d990a05721af20b1783 (diff) | |
Add comment regarding long match distance bit costs.
Diffstat (limited to 'deflate_medium.c')
| -rw-r--r-- | deflate_medium.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/deflate_medium.c b/deflate_medium.c index 8283a08..07ce71f 100644 --- a/deflate_medium.c +++ b/deflate_medium.c @@ -292,6 +292,7 @@ ZLIB_INTERNAL block_state deflate_medium(deflate_state *s, int flush) { } /* short matches with a very long distance are rarely a good idea encoding wise */ + /* distances 8193–16384 take 12 extra bits, distances 16385–32768 take 13 extra bits */ if (next_match.match_length == 3 && (next_match.strstart - next_match.match_start) > 12000) next_match.match_length = 1; s->strstart = current_match.strstart; |