f69251d87e
git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@7245 212acab6-be3b-0410-9dea-997c60f758d6
53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
/*
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* CRC.h
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*
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* This file is a part of LZMA compression module for NSIS.
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*
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* Original LZMA SDK Copyright (C) 1999-2006 Igor Pavlov
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* Modifications Copyright (C) 2003-2021 Amir Szekely <kichik@netvision.net.il>
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*
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* Licensed under the Common Public License version 1.0 (the "License");
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* you may not use this file except in compliance with the License.
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*
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* Licence details can be found in the file COPYING.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty.
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*
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* Reviewed for Unicode support by Jim Park -- 08/28/2007
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*/
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#ifndef __COMMON_CRC_H
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#define __COMMON_CRC_H
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#include <stddef.h>
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#include "Types.h"
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class CCRC
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{
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UInt32 _value;
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public:
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static UInt32 Table[256];
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static void InitTable();
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CCRC(): _value(0xFFFFFFFF){};
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void Init() { _value = 0xFFFFFFFF; }
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void UpdateByte(Byte v);
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void UpdateUInt16(UInt16 v);
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void UpdateUInt32(UInt32 v);
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void UpdateUInt64(UInt64 v);
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void Update(const void *data, size_t size);
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UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; }
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static UInt32 CalculateDigest(const void *data, size_t size)
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{
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CCRC crc;
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crc.Update(data, size);
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return crc.GetDigest();
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}
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static bool VerifyDigest(UInt32 digest, const void *data, size_t size)
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{
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return (CalculateDigest(data, size) == digest);
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}
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};
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#endif
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