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Added back big-endian support again on the new metadata structures

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The only interesting thing to note is that we now have to also support
le16 due to storing the id outside of tags in the globals structure.
This commit is contained in:
Christopher Haster
2018-08-01 18:10:24 -05:00
parent 64df0a5e20
commit 112fefc068
2 changed files with 131 additions and 83 deletions
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25
lfs_util.h
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@@ -136,7 +136,7 @@ static inline int lfs_scmp(uint32_t a, uint32_t b) {
return (int)(unsigned)(a - b);
}
// Convert from 32-bit little-endian to native order
// Convert between 32-bit little-endian and native order
static inline uint32_t lfs_fromle32(uint32_t a) {
#if !defined(LFS_NO_INTRINSICS) && ( \
(defined( BYTE_ORDER ) && BYTE_ORDER == ORDER_LITTLE_ENDIAN ) || \
@@ -156,11 +156,32 @@ static inline uint32_t lfs_fromle32(uint32_t a) {
#endif
}
// Convert to 32-bit little-endian from native order
static inline uint32_t lfs_tole32(uint32_t a) {
return lfs_fromle32(a);
}
// Convert between 16-bit little-endian and native order
static inline uint16_t lfs_fromle16(uint16_t a) {
#if !defined(LFS_NO_INTRINSICS) && ( \
(defined( BYTE_ORDER ) && BYTE_ORDER == ORDER_LITTLE_ENDIAN ) || \
(defined(__BYTE_ORDER ) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN ) || \
(defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
return a;
#elif !defined(LFS_NO_INTRINSICS) && ( \
(defined( BYTE_ORDER ) && BYTE_ORDER == ORDER_BIG_ENDIAN ) || \
(defined(__BYTE_ORDER ) && __BYTE_ORDER == __ORDER_BIG_ENDIAN ) || \
(defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
return __builtin_bswap16(a);
#else
return (((uint8_t*)&a)[0] << 0) |
(((uint8_t*)&a)[1] << 8);
#endif
}
static inline uint16_t lfs_tole16(uint16_t a) {
return lfs_fromle16(a);
}
// Align to nearest multiple of a size
static inline uint32_t lfs_alignup(uint32_t a, uint32_t alignment) {
return (a + alignment-1) - ((a + alignment-1) % alignment);