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/*
* CRC.h
*
* This file is a part of LZMA compression module for NSIS.
*
* Original LZMA SDK Copyright (C) 1999-2006 Igor Pavlov
* Modifications Copyright (C) 2003-2006 Amir Szekely <kichik@netvision.net.il>
*
* Licensed under the Common Public License version 1.0 (the "License");
* you may not use this file except in compliance with the License.
*
* Licence details can be found in the file COPYING.
*
* This software is provided 'as-is', without any express or implied
* warranty.
*/
#ifndef __COMMON_CRC_H
#define __COMMON_CRC_H
#include <stddef.h>
#include "Types.h"
class CCRC
{
UInt32 _value;
public:
static UInt32 Table[256];
static void InitTable();
CCRC(): _value(0xFFFFFFFF){};
void Init() { _value = 0xFFFFFFFF; }
void UpdateByte(Byte v);
void UpdateUInt16(UInt16 v);
void UpdateUInt32(UInt32 v);
void UpdateUInt64(UInt64 v);
void Update(const void *data, size_t size);
UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; }
static UInt32 CalculateDigest(const void *data, size_t size)
{
CCRC crc;
crc.Update(data, size);
return crc.GetDigest();
}
static bool VerifyDigest(UInt32 digest, const void *data, size_t size)
{
return (CalculateDigest(data, size) == digest);
}
};
#endif
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