annotate src/core/ngx_crc.h @ 356:b743d290eb3b NGINX_0_6_22

nginx 0.6.22 *) Change: now all ngx_http_perl_module methods return values copied to perl's allocated memory. *) Bugfix: if nginx was built with ngx_http_perl_module, the perl before 5.8.6 was used, and perl supported threads, then during reconfiguration the master process aborted; bug appeared in 0.5.9. Thanks to Boris Zhmurov. *) Bugfix: the ngx_http_perl_module methods may get invalid values of the regex captures. *) Bugfix: a segmentation fault occurred in worker process, if the $r->has_request_body() method was called for a request whose small request body was already received. *) Bugfix: large_client_header_buffers did not freed before going to keep-alive state. Thanks to Olexander Shtepa. *) Bugfix: the last address was missed in the $upstream_addr variable; bug appeared in 0.6.18. *) Bugfix: the "fastcgi_catch_stderr" directive did return error code; now it returns 502 code, that can be rerouted to a next server using the "fastcgi_next_upstream invalid_header" directive. *) Bugfix: a segmentation fault occurred in master process if the "fastcgi_catch_stderr" directive was used; bug appeared in 0.6.10. Thanks to Manlio Perillo.
author Igor Sysoev <http://sysoev.ru>
date Wed, 19 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_ */