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authorLasse Collin <lasse.collin@tukaani.org>2019-06-24 00:40:45 +0300
committerLasse Collin <lasse.collin@tukaani.org>2019-06-24 00:40:45 +0300
commit1d4a904d8fb634bd5a04f7fbdd17d3739f3d8866 (patch)
tree31c82e33184d7bf0e4febf2f191abac8460d6797 /src
parentxz: list.c: Fix some warnings from -Wsign-conversion. (diff)
downloadxz-1d4a904d8fb634bd5a04f7fbdd17d3739f3d8866.tar.xz
xz: Change io_seek_src and io_pread arguments from off_t to uint64_t.
This helps fixing warnings from -Wsign-conversion and makes the code look better too.
Diffstat (limited to 'src')
-rw-r--r--src/xz/file_io.c16
-rw-r--r--src/xz/file_io.h4
-rw-r--r--src/xz/list.c9
3 files changed, 18 insertions, 11 deletions
diff --git a/src/xz/file_io.c b/src/xz/file_io.c
index 43db7c7f..2d1f8a91 100644
--- a/src/xz/file_io.c
+++ b/src/xz/file_io.c
@@ -1170,11 +1170,19 @@ io_read(file_pair *pair, io_buf *buf_union, size_t size)
extern bool
-io_seek_src(file_pair *pair, off_t pos)
+io_seek_src(file_pair *pair, uint64_t pos)
{
- assert(pos >= 0);
+ // Caller must not attempt to seek past the end of the input file
+ // (seeking to 100 in a 100-byte file is seeking to the end of
+ // the file, not past the end of the file, and thus that is allowed).
+ //
+ // This also validates that pos can be safely cast to off_t.
+ if (pos > (uint64_t)(pair->src_st.st_size))
+ message_bug();
+
+ const off_t offset = (off_t)pos;
- if (lseek(pair->src_fd, pos, SEEK_SET) != pos) {
+ if (lseek(pair->src_fd, offset, SEEK_SET) != offset) {
message_error(_("%s: Error seeking the file: %s"),
pair->src_name, strerror(errno));
return true;
@@ -1187,7 +1195,7 @@ io_seek_src(file_pair *pair, off_t pos)
extern bool
-io_pread(file_pair *pair, io_buf *buf, size_t size, off_t pos)
+io_pread(file_pair *pair, io_buf *buf, size_t size, uint64_t pos)
{
// Using lseek() and read() is more portable than pread() and
// for us it is as good as real pread().
diff --git a/src/xz/file_io.h b/src/xz/file_io.h
index 84d5b44d..ff6fb80a 100644
--- a/src/xz/file_io.h
+++ b/src/xz/file_io.h
@@ -139,7 +139,7 @@ extern void io_fix_src_pos(file_pair *pair, size_t rewind_size);
///
/// \return On success, false is returned. On error, error message
/// is printed and true is returned.
-extern bool io_seek_src(file_pair *pair, off_t pos);
+extern bool io_seek_src(file_pair *pair, uint64_t pos);
/// \brief Read from source file from given offset to a buffer
@@ -155,7 +155,7 @@ extern bool io_seek_src(file_pair *pair, off_t pos);
///
/// \return On success, false is returned. On error, error message
/// is printed and true is returned.
-extern bool io_pread(file_pair *pair, io_buf *buf, size_t size, off_t pos);
+extern bool io_pread(file_pair *pair, io_buf *buf, size_t size, uint64_t pos);
/// \brief Writes a buffer to the destination file
diff --git a/src/xz/list.c b/src/xz/list.c
index 364e2c14..70b4a9bb 100644
--- a/src/xz/list.c
+++ b/src/xz/list.c
@@ -382,12 +382,11 @@ parse_indexes(xz_file_info *xfi, file_pair *pair)
break;
case LZMA_SEEK_NEEDED:
- // The cast is safe because liblzma won't ask us to
- // seek past the known size of the input file which
- // did fit into off_t.
+ // liblzma won't ask us to seek past the known size
+ // of the input file.
assert(strm.seek_pos
<= (uint64_t)(pair->src_st.st_size));
- if (io_seek_src(pair, (off_t)(strm.seek_pos)))
+ if (io_seek_src(pair, strm.seek_pos))
goto error;
// avail_in must be zero so that we will read new
@@ -589,7 +588,7 @@ parse_check_value(file_pair *pair, const lzma_index_iter *iter)
// Locate and read the Check field.
const uint32_t size = lzma_check_size(iter->stream.flags->check);
- const off_t offset = iter->block.compressed_file_offset
+ const uint64_t offset = iter->block.compressed_file_offset
+ iter->block.total_size - size;
io_buf buf;
if (io_pread(pair, &buf, size, offset))