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| author | Yuichiro MASUI <[email protected]> | 2013-03-02 23:40:34 +0900 |
|---|---|---|
| committer | Yuichiro MASUI <[email protected]> | 2013-03-08 03:14:21 +0900 |
| commit | 284258367881d74f784485c2e5d282f4f5d490a5 (patch) | |
| tree | a160d3c745f14e600edaed724f67d3107b362049 /src/crc.c | |
| parent | 7d47096434994d9eb9712546879e3b52b04d3443 (diff) | |
| download | mruby-284258367881d74f784485c2e5d282f4f5d490a5.tar.gz mruby-284258367881d74f784485c2e5d282f4f5d490a5.zip | |
New mrb format. The detail is in https://github.com/mruby/mruby/issues/944
Diffstat (limited to 'src/crc.c')
| -rw-r--r-- | src/crc.c | 9 |
1 files changed, 6 insertions, 3 deletions
@@ -6,6 +6,8 @@ #include <limits.h> #include <stdint.h> +#include <sys/types.h> + // Calculate CRC (CRC-16-CCITT) // // 0000_0000_0000_0000_0000_0000_0000_0000 @@ -16,10 +18,10 @@ #define CRC_CARRY_BIT (1 << 24) uint16_t -calc_crc_16_ccitt(unsigned char *src, int nbytes) +calc_crc_16_ccitt(const unsigned char *src, uint32_t nbytes, uint16_t crc) { - uint32_t crcwk = 0ul; - int ibyte, ibit; + uint32_t ibyte, ibit; + uint32_t crcwk = crc << 8; for (ibyte = 0; ibyte < nbytes; ibyte++) { crcwk |= *src++; @@ -32,3 +34,4 @@ calc_crc_16_ccitt(unsigned char *src, int nbytes) } return (uint16_t)(crcwk >> 8); } + |