1 #ifndef __CRC32_H__ 2 #define __CRC32_H__ 3 4 #ifndef _ANSI_ARGS_ 5 #ifdef PROTOTYPES 6 #define _ANSI_ARGS_(c) c 7 #else 8 #define _ANSI_ARGS_(c) () 9 #endif 10 #endif 11 12 #ifdef __cplusplus 13 extern "C" { 14 #endif 15 16 typedef unsigned long crc32_t; 17 #define Z_NULL 0 18 19 crc32_t crc32 _ANSI_ARGS_((crc32_t crc, const unsigned char *buf, unsigned int len)); 20 /* 21 Update a running crc with the bytes buf[0..len-1] and return the updated 22 crc. If buf is NULL, this function returns the required initial value 23 for the crc. Pre- and post-conditioning (one's complement) is performed 24 within this function so it shouldn't be done by the application. 25 Usage example: 26 27 uLong crc = crc32(0L, Z_NULL, 0); 28 29 while (read_buffer(buffer, length) != EOF) { 30 crc = crc32(crc, buffer, length); 31 } 32 if (crc != original_crc) error(); 33 */ 34 35 #ifdef __cplusplus 36 } 37 #endif 38 #endif 39