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archive/iso9660: check "skip==0" before doing optimized large read 

After a Seek() to an odd offset, some data needs to be skipped from
the start of the block, and reading right into the given buffer
doesn't work.
This commit is contained in:
Max Kellermann 2021-02-07 21:24:47 +01:00
parent c58c53293c
commit 4be76f3c8f
1 changed files with 1 additions and 1 deletions
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2
src/archive/plugins/Iso9660ArchivePlugin.cxx
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@ -266,7 +266,7 @@ Iso9660InputStream::Read(std::unique_lock<Mutex> &,
const lsn_t read_lsn = lsn + offset / ISO_BLOCKSIZE;
if (read_size >= ISO_BLOCKSIZE) {
if (read_size >= ISO_BLOCKSIZE && skip == 0) {
/* big read - read right into the caller's buffer */
auto nbytes = iso->SeekRead(ptr, read_lsn,