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Update lfs.c

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This should fix the performance issue if a new seek position belongs to currently cached data.
This avoids unnecessary rereads of file data.
This commit is contained in:
robekras
2022-01-16 20:50:01 +01:00
committed by Christopher Haster
parent 9c7e232086
commit a6f01b7d6e
1 changed files with 15 additions and 0 deletions
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lfs.c
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@@ -3091,6 +3091,21 @@ static lfs_soff_t lfs_file_rawseek(lfs_t *lfs, lfs_file_t *file,
return npos; return npos;
} }
// Get the difference between new and current file position
// If new position is after the current file position
// If new position belongs to the currently cached data
// Set new file position,
// and update also the block related position
int offset = npos - file->pos;
if (offset > 0) {
if ((file->off + offset) < lfs->cfg->block_size) {
file->pos = npos;
file->off += offset;
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) {