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Exact variant of CRC16 specified into crc16.c

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antirez 2011-10-02 14:05:29 +02:00
parent 66c146592a
commit 13c7e5ef29
1 changed files with 14 additions and 1 deletions
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src/crc16.c
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@ -28,7 +28,20 @@
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
/* CRC16 implementation acording to CCITT standards */ /* CRC16 implementation acording to CCITT standards.
*
* Note by @antirez: this is actually the XMODEM CRC 16 algorithm, using the
* following parameters:
*
* Name : "XMODEM", also known as "ZMODEM", "CRC-16/ACORN"
* Width : 16 bit
* Poly : 1021 (That is actually x^16 + x^12 + x^5 + 1)
* Initialization : 0000
* Reflect Input byte : False
* Reflect Output CRC : False
* Xor constant to output CRC : 0000
* Output for "123456789" : 31C3
*/
static const uint16_t crc16tab[256]= { static const uint16_t crc16tab[256]= {
0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7, 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,