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lzf: prevent lzf header struct optimization

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Add packed attribute to lzf header structs to prevent the compiler
from optimizing lzf_magic array initialization into wider store
instructions (e.g. st.h), which can cause misaligned access
exceptions on architectures that do not support unaligned memory access.

Signed-off-by: zhangyuan29 <zhangyuan29@xiaomi.com>
This commit is contained in:
zhangyuan29 2025-04-30 14:39:41 +08:00 • committed by simbit18
parent d0417490d2
commit 069ceab9c5
1 changed files with 6 additions and 6 deletions
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12
include/lzf.h
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@ -64,26 +64,26 @@
/* LZF headers */
struct lzf_header_s /* Common data header */
begin_packed_struct struct lzf_header_s /* Common data header */
{
uint8_t lzf_magic[2]; /* [0]='Z', [1]='V' */
uint8_t lzf_type; /* LZF_TYPE0_HDR or LZF_TYPE1_HDR */
};
} end_packed_struct;
struct lzf_type0_header_s /* Uncompressed data header */
begin_packed_struct struct lzf_type0_header_s /* Uncompressed data header */
{
uint8_t lzf_magic[2]; /* [0]='Z', [1]='V' */
uint8_t lzf_type; /* LZF_TYPE0_HDR */
uint8_t lzf_len[2]; /* Data length (big-endian) */
};
} end_packed_struct;
struct lzf_type1_header_s /* Compressed data header */
begin_packed_struct struct lzf_type1_header_s /* Compressed data header */
{
uint8_t lzf_magic[2]; /* [0]='Z', [1]='V' */
uint8_t lzf_type; /* LZF_TYPE1_HDR */
uint8_t lzf_clen[2]; /* Compressed data length (big-endian) */
uint8_t lzf_ulen[2]; /* Uncompressed data length (big-endian) */
};
} end_packed_struct;
/* LZF hash table */