diff options
author | Igor Sysoev <igor@sysoev.ru> | 2003-11-30 23:03:18 +0300 |
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committer | Igor Sysoev <igor@sysoev.ru> | 2003-11-30 23:03:18 +0300 |
commit | 865c150cb473fca8ff91d60ddd539ac6dbbe02ee (patch) | |
tree | 1ae51b35fbfaa069adf98db8a4c98887bdd3f9a8 /src/core/ngx_crc.h | |
parent | c2bba092eb07ea5fcd2e2ee987e3a304f755a3c7 (diff) |
nginx-0.0.1-2003-11-30-23:03:18 import
Diffstat (limited to 'src/core/ngx_crc.h')
-rw-r--r-- | src/core/ngx_crc.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/core/ngx_crc.h b/src/core/ngx_crc.h new file mode 100644 index 000000000..df6488967 --- /dev/null +++ b/src/core/ngx_crc.h @@ -0,0 +1,26 @@ +#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_ */ |