diff options
Diffstat (limited to 'helpers.c')
-rw-r--r-- | helpers.c | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -66,6 +66,23 @@ void tolower_string(char *str) *str = (char)tolower((unsigned char)*str); } +uint8_t reverse_byte(uint8_t x) +{ + x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa); + x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc); + x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0); + + return x; +} + +void reverse_bytes(uint8_t *dst, const uint8_t *src, size_t length) +{ + size_t i; + + for (i = 0; i < length; i++) + dst[i] = reverse_byte(src[i]); +} + /* FIXME: Find a better solution for MinGW. Maybe wrap strtok_s (C11) if it becomes available */ #ifdef __MINGW32__ char* strtok_r(char *str, const char *delim, char **nextp) |