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-rw-r--r--src/xz/file_io.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/xz/file_io.h b/src/xz/file_io.h
index ff6fb80a..4b4418d6 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)];