crc.h

16位CRC的c语言实现。并编写了测试程序

/*
 |
 | Copyright disclaimer:
 |   This software was developed at the National Institute of Standards
 |   and Technology by employees of the Federal Government in the course
 |   of their official duties. Pursuant to title 17 Section 105 of the
 |   United States Code this software is not subject to copyright
 |   protection and is in the public domain.
 |
 |   We would appreciate acknowledgement if the software is used.
 |
*/

/*
 | Project:     WCDMA simulation environment
 | Module:      Cyclic rendundance Check routines for different
 |              generator polynomials.
 | Author:      Tommi Makelainen
 | Date:        January 28, 1999
 |
 | History:
 |              January 28, 1999 Tommi Makelainen
 |                      Initial version.
 |
 */
#ifndef crc_h
#define crc_h
/* ----------------------------------------------------------- */

#define CRC16 0x1021	/* Generator polynomial (X^16 + X^12 + X^5 + 1) */

/*
 * Init the fast CRC-16 calculation table.
 */
void wcdma_crctable_init (int crc_gen_poly);  /* gen. polynomial as bit mask */

/*
 * Calculate CRC for 'input_data' having 'input_len' bytes.
 */
unsigned short wcdma_calc_crc(
	int *input_data,	        /* input data byte vector */
	int input_len);			/* length of input (in bytes) */

/*
 * Calculate CRC for 'input_data' having 'input_len' bits.
 */
unsigned short wcdma_get_crc_value(
        int input_data[],       /* IN: input data bit vector */
        int input_len,          /* IN: length of input (in bits) */
        int crc_bits[]);        /* OUT: output crc bit vector (16 bits) */

#endif