diff options
Diffstat (limited to 'src/xz/file_io.c')
| -rw-r--r-- | src/xz/file_io.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/xz/file_io.c b/src/xz/file_io.c index d86b36e7..c48df6e4 100644 --- a/src/xz/file_io.c +++ b/src/xz/file_io.c @@ -1293,8 +1293,15 @@ io_write(file_pair *pair, const io_buf *buf, size_t size) // if the file ends with sparse block, we must also return // if size == 0 to avoid doing the lseek(). if (size == IO_BUFFER_SIZE) { - if (is_sparse(buf)) { - pair->dest_pending_sparse += size; + // Even if the block was sparse, treat it as non-sparse + // if the pending sparse amount is large compared to + // the size of off_t. In practice this only matters + // on 32-bit systems where off_t isn't always 64 bits. + const off_t pending_max + = (off_t)(1) << (sizeof(off_t) * CHAR_BIT - 2); + if (is_sparse(buf) && pair->dest_pending_sparse + < pending_max) { + pair->dest_pending_sparse += (off_t)(size); return false; } } else if (size == 0) { |