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annotate src/core/ngx_crc.h @ 7892:2096b21fcd10

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gRPC: RST_STREAM(NO_ERROR) handling (ticket #1792). As per https://tools.ietf.org/html/rfc7540#section-8.1, : A server can send a complete response prior to the client : sending an entire request if the response does not depend on : any portion of the request that has not been sent and : received. When this is true, a server MAY request that the : client abort transmission of a request without error by : sending a RST_STREAM with an error code of NO_ERROR after : sending a complete response (i.e., a frame with the : END_STREAM flag). Clients MUST NOT discard responses as a : result of receiving such a RST_STREAM, though clients can : always discard responses at their discretion for other : reasons. Previously, RST_STREAM(NO_ERROR) received from upstream after a frame with the END_STREAM flag was incorrectly treated as an error. Now, a single RST_STREAM(NO_ERROR) is properly handled. This fixes problems observed with modern grpc-c [1], as well as with the Go gRPC module. [1] https://github.com/grpc/grpc/pull/1661
author Ruslan Ermilov <ru@nginx.com>
date Thu, 23 Apr 2020 15:10:24 +0300
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2 /*
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3 * Copyright (C) Igor Sysoev
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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_ */