annotate src/core/ngx_crc.h @ 290:f745bf973510 NGINX_0_5_15

nginx 0.5.15 *) Feature: the mail proxy supports authenticated SMTP proxying and the "smtp_auth", "smtp_capablities", and "xclient" directives. Thanks to Anton Yuzhaninov and Maxim Dounin. *) Feature: now the keep-alive connections are closed just after receiving the reconfiguration signal. *) Change: the "imap" and "auth" directives were renamed to the "mail" and "pop3_auth" directives. *) Bugfix: a segmentation fault occurred in worker process if the CRAM-MD5 authentication method was used and the APOP method was disabled. *) Bugfix: if the "starttls only" directive was used in POP3 protocol, then nginx allowed authentication without switching to the SSL mode. *) Bugfix: worker processes did not exit after reconfiguration and did not rotate logs if the eventport method was used. *) Bugfix: a worker process may got caught in an endless loop, if the "ip_hash" directive was used. *) Bugfix: now nginx does not log some alerts if eventport or /dev/poll methods are used.
author Igor Sysoev <http://sysoev.ru>
date Mon, 19 Mar 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_ */