diff options
| author | Toni Uhlig <matzeton@googlemail.com> | 2023-07-16 02:03:33 +0200 |
|---|---|---|
| committer | Toni Uhlig <matzeton@googlemail.com> | 2023-07-16 02:03:33 +0200 |
| commit | 5a40295c4cf0af5ea8da9ced04a4ce7d3621a080 (patch) | |
| tree | cb21506e7b04d10b45d6066a0ee1655563d5d52b /external/hash/unaligned.h | |
Squashed 'flatcc/' content from commit 473da2a
git-subtree-dir: flatcc
git-subtree-split: 473da2afa5ca435363f8c5e6569167aee6bc31c5
Diffstat (limited to 'external/hash/unaligned.h')
| -rw-r--r-- | external/hash/unaligned.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/external/hash/unaligned.h b/external/hash/unaligned.h new file mode 100644 index 0000000..0431f96 --- /dev/null +++ b/external/hash/unaligned.h @@ -0,0 +1,42 @@ +#ifndef UNALIGNED_H +#define UNALIGNED_H + +/* + * This is a simplified version of portable/punaligned.h that does not depend on + * endian detection, but which assumes x86 is always little endian. + * Include the portable version for better precision. + */ + +#ifndef unaligned_read_le16toh + +#if defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64) + +#define unaligned_read_le16toh(p) (*(uint16_t*)(p)) +#define unaligned_read_le32toh(p) (*(uint32_t*)(p)) +#define unaligned_read_le64toh(p) (*(uint64_t*)(p)) + +#else + +#define unaligned_read_le16toh(p) ( \ + (((uint16_t)(((uint8_t *)(p))[0])) << 0) | \ + (((uint16_t)(((uint8_t *)(p))[1])) << 8)) + +#define unaligned_read_le32toh(p) ( \ + (((uint32_t)(((uint8_t *)(p))[0])) << 0) | \ + (((uint32_t)(((uint8_t *)(p))[1])) << 8) | \ + (((uint32_t)(((uint8_t *)(p))[2])) << 16) | \ + (((uint32_t)(((uint8_t *)(p))[3])) << 24)) + +#define unaligned_read_le64toh(p) ( \ + (((uint64_t)(((uint8_t *)(p))[0])) << 0) | \ + (((uint64_t)(((uint8_t *)(p))[1])) << 8) | \ + (((uint64_t)(((uint8_t *)(p))[2])) << 16) | \ + (((uint64_t)(((uint8_t *)(p))[3])) << 24) | \ + (((uint64_t)(((uint8_t *)(p))[4])) << 32) | \ + (((uint64_t)(((uint8_t *)(p))[5])) << 40) | \ + (((uint64_t)(((uint8_t *)(p))[6])) << 48) | \ + (((uint64_t)(((uint8_t *)(p))[7])) << 56)) +#endif +#endif + +#endif /* UNALIGNED_H */ |