annotate src/core/ngx_crc.h @ 579:be4f34123024 NGINX_0_8_35

nginx 0.8.35 *) Change: now the charset filter runs before the SSI filter. *) Feature: the "chunked_transfer_encoding" directive. *) Bugfix: an "&" character was not escaped when it was copied in arguments part in a rewrite rule. *) Bugfix: nginx might be terminated abnormally while a signal processing or if the directive "timer_resolution" was used on platforms which do not support kqueue or eventport notification methods. Thanks to George Xie and Maxim Dounin. *) Bugfix: if temporary files and permanent storage area resided at different file systems, then permanent file modification times were incorrect. Thanks to Maxim Dounin. *) Bugfix: ngx_http_memcached_module might issue the error message "memcached sent invalid trailer". Thanks to Maxim Dounin. *) Bugfix: nginx could not built zlib-1.2.4 library using the library sources. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault occurred in a worker process, if there was large stderr output before FastCGI response; the bug had appeared in 0.8.34. Thanks to Maxim Dounin.
author Igor Sysoev <http://sysoev.ru>
date Mon, 29 Mar 2010 00:00:00 +0400
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #ifndef _NGX_CRC_H_INCLUDED_
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8 #define _NGX_CRC_H_INCLUDED_
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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15 /* 32-bit crc16 */
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17 static ngx_inline uint32_t
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18 ngx_crc(u_char *data, size_t len)
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19 {
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20 uint32_t sum;
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22 for (sum = 0; len; len--) {
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24 /*
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25 * gcc 2.95.2 x86 and icc 7.1.006 compile
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26 * that operator into the single "rol" opcode,
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27 * msvc 6.0sp2 compiles it into four opcodes.
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28 */
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29 sum = sum >> 1 | sum << 31;
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31 sum += *data++;
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32 }
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34 return sum;
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35 }
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38 #endif /* _NGX_CRC_H_INCLUDED_ */