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view src/core/ngx_crc.h @ 444:42d11f017717
nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 29 Sep 2004 16:00:49 +0000 |
parents | da8c5707af39 |
children | bbd6b0b4a2b1 |
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/* * Copyright (C) Igor Sysoev */ #ifndef _NGX_CRC_H_INCLUDED_ #define _NGX_CRC_H_INCLUDED_ /* 32-bit crc16 */ ngx_inline static uint32_t ngx_crc(char *data, size_t len) { uint32_t sum; for (sum = 0; len; len--) { /* * gcc 2.95.2 x86 and icc 7.1.006 compile that operator * into the single "rol" opcode. * msvc 6.0sp2 compiles it into four opcodes. */ sum = sum >> 1 | sum << 31; sum += *data++; } return sum; } #endif /* _NGX_CRC_H_INCLUDED_ */