diff options
| -rw-r--r-- | src/xz/file_io.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/xz/file_io.h b/src/xz/file_io.h index 6722aef8..32dcad0c 100644 --- a/src/xz/file_io.h +++ b/src/xz/file_io.h @@ -20,7 +20,10 @@ /// is_sparse() accesses the buffer as uint64_t for maximum speed. -/// Use an union to make sure that the buffer is properly aligned. +/// The u32 and u64 members must only be access through this union +/// to avoid strict aliasing violations. Taking a pointer of u8 +/// should be fine as long as uint8_t maps to unsigned char which +/// can alias anything. typedef union { uint8_t u8[IO_BUFFER_SIZE]; uint32_t u32[IO_BUFFER_SIZE / sizeof(uint32_t)]; |