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| author | Sen Jiang <senj@google.com> | 2018-04-06 15:33:06 -0700 |
|---|---|---|
| committer | Sen Jiang <senj@google.com> | 2018-04-09 17:32:51 -0700 |
| commit | 3a4725a87796a3dec4c81501daef1eebf4d5ed88 (patch) | |
| tree | 11da834207f4550a175063219e58c52ac89829e9 /bsdiff.cc | |
| parent | a65e5485c955499ec98cb052f7b1b00693dadae8 (diff) | |
| download | bsdiff-3a4725a87796a3dec4c81501daef1eebf4d5ed88.tar.gz | |
Exit loop ealier when matching lastoffset.
|lastoffset| and |oldsize| doesn't change in this loop, no point keep
incrementing |scsc| and comparing.
bsdiff is about 2% faster with no change on the patch content.
Bug: 77817425
Test: bsdiff_unittest
Change-Id: Ie6a5ddc4b8805ed76c9c626fa75010617b7975ef
Diffstat (limited to 'bsdiff.cc')
| -rw-r--r-- | bsdiff.cc | 7 |
1 files changed, 3 insertions, 4 deletions
@@ -114,10 +114,9 @@ int bsdiff(const uint8_t* old_buf, size_t oldsize, const uint8_t* new_buf, sai->SearchPrefix(new_buf + scan, newsize - scan, &len, &pos); - for(;scsc<scan+len;scsc++) - if((scsc+lastoffset<oldsize) && - (old_buf[scsc+lastoffset] == new_buf[scsc])) - oldscore++; + for(;scsc<scan+len && scsc+lastoffset<oldsize;scsc++) + if(old_buf[scsc+lastoffset] == new_buf[scsc]) + oldscore++; if(((len==oldscore) && (len!=0)) || (len>oldscore+8 && len>=min_length)) break; |