| 31,7 → 31,7 |
|---|
| */ |
| |
| /** @file |
| * General CRC computation implementation. |
| * General CRC and checksum computation implementation. |
| */ |
| |
| #include <sys/types.h> |
| 100,5 → 100,28 |
|---|
| return seed; |
| } |
| |
| uint32_t compute_checksum( uint32_t seed, uint8_t * data, int length ){ |
| int index; |
| |
| // sum all the 16 bit fields |
| for( index = 0; index < length - 1; index += 2 ){ |
| seed += ( data[ index ] << 8 ) + data[ index + 1 ]; |
| } |
| |
| // last odd byte with zero padding |
| if( index == length - 1 ){ |
| seed += data[ index ] << 8; |
| } |
| |
| return seed; |
| } |
| |
| uint16_t compact_checksum( uint32_t sum ){ |
| // shorten to the 16 bits |
| while( sum >> 16 ) sum = ( sum & 0xFFFF ) + ( sum >> 16 ); |
| |
| return ( uint16_t ) sum; |
| } |
| |
| /** @} |
| */ |