annotate src/core/ngx_crc.h @ 358:9121a0a91f47 NGINX_0_6_23

nginx 0.6.23 *) Change: the "off" parameter in the "ssl_session_cache" directive; now this is default parameter. *) Change: the "open_file_cache_retest" directive was renamed to the "open_file_cache_valid". *) Feature: the "open_file_cache_min_uses" directive. *) Feature: the ngx_http_gzip_static_module. *) Feature: the "gzip_disable" directive. *) Feature: the "memcached_pass" directive may be used inside the "if" block. *) Bugfix: a segmentation fault occurred in worker process, if the "memcached_pass" and "if" directives were used in the same location. *) Bugfix: if a "satisfy_any on" directive was used and not all access and auth modules directives were set, then other given access and auth directives were not tested; *) Bugfix: regex parameters in a "valid_referers" directive were not inherited from previous level. *) Bugfix: a "post_action" directive did run if a request was completed with 499 status code. *) Bugfix: optimization of 16K buffer usage in a SSL connection. Thanks to Ben Maurer. *) Bugfix: the STARTTLS in SMTP mode did not work. Thanks to Oleg Motienko. *) Bugfix: in HTTPS mode requests might fail with the "bad write retry" error; bug appeared in 0.5.13.
author Igor Sysoev <http://sysoev.ru>
date Thu, 27 Dec 2007 00:00:00 +0300
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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_ */