diff options
Diffstat (limited to 'libbb/crc32.c')
| -rw-r--r-- | libbb/crc32.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/libbb/crc32.c b/libbb/crc32.c index 520b1ffb9..2cc6ea779 100644 --- a/libbb/crc32.c +++ b/libbb/crc32.c @@ -18,6 +18,8 @@ #include "libbb.h" +uint32_t *global_crc32_table; + uint32_t* FAST_FUNC crc32_filltable(uint32_t *crc_table, int endian) { uint32_t polynomial = endian ? 0x04c11db7 : 0xedb88320; @@ -40,3 +42,25 @@ uint32_t* FAST_FUNC crc32_filltable(uint32_t *crc_table, int endian) return crc_table - 256; } + +uint32_t FAST_FUNC crc32_block_endian1(uint32_t val, const void *buf, unsigned len, uint32_t *crc_table) +{ + const void *end = (uint8_t*)buf + len; + + while (buf != end) { + val = (val << 8) ^ crc_table[(val >> 24) ^ *(uint8_t*)buf]; + buf = (uint8_t*)buf + 1; + } + return val; +} + +uint32_t FAST_FUNC crc32_block_endian0(uint32_t val, const void *buf, unsigned len, uint32_t *crc_table) +{ + const void *end = (uint8_t*)buf + len; + + while (buf != end) { + val = crc_table [(uint8_t)val ^ *(uint8_t*)buf] ^ (val >> 8); + buf = (uint8_t*)buf + 1; + } + return val; +} |