3 * Copyright (C) Igor Sysoev
7 #ifndef _NGX_CRC_H_INCLUDED_
8 #define _NGX_CRC_H_INCLUDED_
11 #include <ngx_config.h>
17 static ngx_inline uint32_t
18 ngx_crc(u_char *data, size_t len)
22 for (sum = 0; len; len--) {
25 * gcc 2.95.2 x86 and icc 7.1.006 compile
26 * that operator into the single "rol" opcode,
27 * msvc 6.0sp2 compiles it into four opcodes.
29 sum = sum >> 1 | sum << 31;
38 #endif /* _NGX_CRC_H_INCLUDED_ */