extern void
lzma_check_finish(lzma_check_state *check, lzma_check type)
{
switch (type) {
#ifdef HAVE_CHECK_CRC32
case LZMA_CHECK_CRC32:
check->buffer.u32[0] = conv32le(check->state.crc32);
break;
#endif
#ifdef HAVE_CHECK_CRC64
case LZMA_CHECK_CRC64:
check->buffer.u64[0] = conv64le(check->state.crc64);
break;
#endif
#ifdef HAVE_CHECK_SHA256
case LZMA_CHECK_SHA256:
lzma_sha256_finish(check);
break;
#endif
default:
break;
}
return;
}
/// \brief Parse the Check field and put it into check_value[]
///
/// \return False on success, true on error.
static bool
parse_check_value(file_pair *pair, const lzma_index_iter *iter)
{
// Don't read anything from the file if there is no integrity Check.
if (iter->stream.flags->check == LZMA_CHECK_NONE) {
snprintf(check_value, sizeof(check_value), "---");
return false;
}
// 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
+ iter->block.total_size - size;
io_buf buf;
if (io_pread(pair, &buf, size, offset))
return true;
// CRC32 and CRC64 are in little endian. Guess that all the future
// 32-bit and 64-bit Check values are little endian too. It shouldn't
// be a too big problem if this guess is wrong.
if (size == 4)
snprintf(check_value, sizeof(check_value),
"%08" PRIx32, conv32le(buf.u32[0]));
else if (size == 8)
snprintf(check_value, sizeof(check_value),
"%016" PRIx64, conv64le(buf.u64[0]));
else
for (size_t i = 0; i < size; ++i)
snprintf(check_value + i * 2, 3, "%02x", buf.u8[i]);
return false;
}
