diff options
Diffstat (limited to 'common/crc.c')
-rw-r--r-- | common/crc.c | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/common/crc.c b/common/crc.c index 31054ad732..79d405eb13 100644 --- a/common/crc.c +++ b/common/crc.c @@ -56,9 +56,6 @@ static const uint32_t crc32_tab[] = { 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; -/* Accumulator for the CRC */ -static uint32_t crc_; - static uint32_t crc32_hash(uint32_t crc, const void *buf, int size) { const uint8_t *p; @@ -73,22 +70,50 @@ static uint32_t crc32_hash(uint32_t crc, const void *buf, int size) return crc; } +void crc32_ctx_init(uint32_t *crc) +{ + *crc = CRC32_INITIAL; +} + +void crc32_ctx_hash32(uint32_t *crc, uint32_t val) +{ + *crc = crc32_hash(*crc, &val, sizeof(val)); +} + +void crc32_ctx_hash16(uint32_t *crc, uint16_t val) +{ + *crc = crc32_hash(*crc, &val, sizeof(val)); +} + +void crc32_ctx_hash8(uint32_t *crc, uint8_t val) +{ + *crc = crc32_hash(*crc, &val, sizeof(val)); +} + +uint32_t crc32_ctx_result(uint32_t *crc) +{ + return *crc ^ 0xFFFFFFFF; +} + +/* Accumulator for the CRC */ +static uint32_t crc_; + void crc32_init(void) { - crc_ = CRC32_INITIAL; + crc32_ctx_init(&crc_); } void crc32_hash32(uint32_t val) { - crc_ = crc32_hash(crc_, &val, sizeof(uint32_t)); + crc32_ctx_hash32(&crc_, val); } void crc32_hash16(uint16_t val) { - crc_ = crc32_hash(crc_, &val, sizeof(uint16_t)); + crc32_ctx_hash16(&crc_, val); } uint32_t crc32_result(void) { - return crc_ ^ 0xFFFFFFFF; + return crc32_ctx_result(&crc_); } |