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annotate src/core/ngx_crc.h @ 6469:7cdf612fd58c

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Win32: replaced NGX_EXDEV with more appropriate error code. Correct error code for NGX_EXDEV on Windows is ERROR_NOT_SAME_DEVICE, "The system cannot move the file to a different disk drive". Previously used ERROR_WRONG_DISK is about wrong diskette in the drive and is not appropriate. There is no real difference though, as MoveFile() is able to copy files between disk drives, and will fail with ERROR_ACCESS_DENIED when asked to copy directories. The ERROR_NOT_SAME_DEVICE error is only used by MoveFileEx() when called without the MOVEFILE_COPY_ALLOWED flag.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 29 Mar 2016 09:52:15 +0300
parents d620f497c50f
children
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2 /*
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3 * Copyright (C) Igor Sysoev
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d620f497c50f Copyright updated.
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #ifndef _NGX_CRC_H_INCLUDED_
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9 #define _NGX_CRC_H_INCLUDED_
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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16 /* 32-bit crc16 */
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18 static ngx_inline uint32_t
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19 ngx_crc(u_char *data, size_t len)
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20 {
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21 uint32_t sum;
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23 for (sum = 0; len; len--) {
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25 /*
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26 * gcc 2.95.2 x86 and icc 7.1.006 compile
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27 * that operator into the single "rol" opcode,
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28 * msvc 6.0sp2 compiles it into four opcodes.
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29 */
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30 sum = sum >> 1 | sum << 31;
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32 sum += *data++;
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33 }
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35 return sum;
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36 }
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39 #endif /* _NGX_CRC_H_INCLUDED_ */