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Merge pull request #632 from robekras/patch-1

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Fix lfs_file_rawseek performance issue
This commit is contained in:
Christopher Haster
2022-04-10 21:52:27 -05:00
committed by GitHub
parent cc025653ed 425dc810a5
commit a94fbda1cd
1 changed files with 21 additions and 0 deletions
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21
lfs.c
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@@ -3100,6 +3100,27 @@ static lfs_soff_t lfs_file_rawseek(lfs_t *lfs, lfs_file_t *file,
return npos; return npos;
} }
// if we're only reading and our new offset is still in the file's cache
// we can avoid flushing and needing to reread the data
if (
#ifndef LFS_READONLY
!(file->flags & LFS_F_WRITING)
#else
true
#endif
) {
int oindex = lfs_ctz_index(lfs, &(lfs_off_t){file->pos});
lfs_off_t noff = npos;
int nindex = lfs_ctz_index(lfs, &noff);
if (oindex == nindex
&& noff >= file->cache.off
&& noff < file->cache.off + file->cache.size) {
file->pos = npos;
file->off = noff;
return npos;
}
}
// write out everything beforehand, may be noop if rdonly // write out everything beforehand, may be noop if rdonly
int err = lfs_file_flush(lfs, file); int err = lfs_file_flush(lfs, file);
if (err) { if (err) {