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annotate include/llvm/Support/JamCRC.h @ 147:c2174574ed3a

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LLVM 10
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 14 Aug 2019 16:55:33 +0900
parents 1172e4bd9c6f
children
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1 //===-- llvm/Support/JamCRC.h - Cyclic Redundancy Check ---------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file contains an implementation of JamCRC.
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10 //
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11 // We will use the "Rocksoft^tm Model CRC Algorithm" to describe the properties
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12 // of this CRC:
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13 // Width : 32
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14 // Poly : 04C11DB7
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15 // Init : FFFFFFFF
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16 // RefIn : True
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17 // RefOut : True
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18 // XorOut : 00000000
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19 // Check : 340BC6D9 (result of CRC for "123456789")
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20 //
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21 // N.B. We permit flexibility of the "Init" value. Some consumers of this need
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22 // it to be zero.
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23 //
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24 //===----------------------------------------------------------------------===//
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25
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26 #ifndef LLVM_SUPPORT_JAMCRC_H
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27 #define LLVM_SUPPORT_JAMCRC_H
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28
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29 #include "llvm/Support/DataTypes.h"
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30
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31 namespace llvm {
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32 template <typename T> class ArrayRef;
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33
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34 class JamCRC {
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35 public:
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36 JamCRC(uint32_t Init = 0xFFFFFFFFU) : CRC(Init) {}
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37
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38 // Update the CRC calculation with Data.
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39 void update(ArrayRef<char> Data);
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40
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41 uint32_t getCRC() const { return CRC; }
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42
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43 private:
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44 uint32_t CRC;
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45 };
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46 } // End of namespace llvm
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47
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48 #endif