github-mirrors/thirdparty-littlefs
1
0
Fork 0
mirror of https://github.com/eledio-devices/thirdparty-littlefs.git synced 2025-10-31 00:32:38 +01:00
Code Issues Packages Projects Releases Wiki Activity

Added conversion to/from little-endian on disk

Browse Source 
Required to support big-endian processors, with the most notable being
the PowerPC architecture.

On little-endian architectures, these conversions can be optimized out
and have no code impact.

Initial patch provided by gmouchard
This commit is contained in:
Christopher Haster
2018-02-02 05:58:43 -06:00
parent 4f08424b51
commit a0a55fb9e5
2 changed files with 99 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
lfs_util.h
View File

@@ -70,6 +70,29 @@ static inline int lfs_scmp(uint32_t a, uint32_t b) {
return (int)(unsigned)(a - b);
}
static inline uint32_t lfs_fromle32(uint32_t a) {
#if ( \
(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( 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_bswap32(a);
#else
return (((uint8_t*)&a)[0] << 0) |
(((uint8_t*)&a)[1] << 8) |
(((uint8_t*)&a)[2] << 16) |
(((uint8_t*)&a)[3] << 24);
#endif
}
static inline uint32_t lfs_tole32(uint32_t a) {
return lfs_fromle32(a);
}
// CRC-32 with polynomial = 0x04c11db7
void lfs_crc(uint32_t *crc, const void *buffer, size_t size);