diff options
Diffstat (limited to 'debian/vendor-h2o/deps/mruby/src/crc.c')
-rw-r--r-- | debian/vendor-h2o/deps/mruby/src/crc.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/debian/vendor-h2o/deps/mruby/src/crc.c b/debian/vendor-h2o/deps/mruby/src/crc.c new file mode 100644 index 0000000..290b2ca --- /dev/null +++ b/debian/vendor-h2o/deps/mruby/src/crc.c @@ -0,0 +1,39 @@ +/* +** crc.c - calculate CRC +** +** See Copyright Notice in mruby.h +*/ + +#include <limits.h> +#include <stdint.h> +#include <stddef.h> + +/* Calculate CRC (CRC-16-CCITT) +** +** 0000_0000_0000_0000_0000_0000_0000_0000 +** ^|------- CRC -------|- work --| +** carry +*/ +#define CRC_16_CCITT 0x11021ul /* x^16+x^12+x^5+1 */ +#define CRC_XOR_PATTERN (CRC_16_CCITT << 8) +#define CRC_CARRY_BIT (0x01000000) + +uint16_t +calc_crc_16_ccitt(const uint8_t *src, size_t nbytes, uint16_t crc) +{ + size_t ibyte; + uint32_t ibit; + uint32_t crcwk = crc << 8; + + for (ibyte = 0; ibyte < nbytes; ibyte++) { + crcwk |= *src++; + for (ibit = 0; ibit < CHAR_BIT; ibit++) { + crcwk <<= 1; + if (crcwk & CRC_CARRY_BIT) { + crcwk ^= CRC_XOR_PATTERN; + } + } + } + return (uint16_t)(crcwk >> 8); +} + |