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seekable_format: Prevent rereading frame when seeking forward

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When decompressing a seekable file, if seeking forward within
a frame (by issuing multiple ZSTD_seekable_decompress calls
with a small gap between them), the frame will be unnecessarily
reread from the beginning. This patch makes it continue using
the current frame data and simply skip over the unneeded bytes.
This commit is contained in:
Yoni Gilad
2022-02-17 19:46:29 +02:00
committed by Yann Collet
parent 871f3a4026
commit 618bf84e0d
1 changed files with 1 additions and 1 deletions
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2
contrib/seekable_format/zstdseek_decompress.c
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@ -493,7 +493,7 @@ size_t ZSTD_seekable_decompress(ZSTD_seekable* zs, void* dst, size_t len, unsign
size_t srcBytesRead = 0;
do {
/* check if we can continue from a previous decompress job */
if (targetFrame != zs->curFrame || offset != zs->decompressedOffset) {
if (targetFrame != zs->curFrame || offset < zs->decompressedOffset) {
zs->decompressedOffset = zs->seekTable.entries[targetFrame].dOffset;
zs->curFrame = targetFrame;