CRC.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "uLang/Common/Common.h"
 
namespace uLang
{
 
class CCRC16
{
public:
 
    ULANG_FORCEINLINE static uint16_t Generate(const uint8_t * Begin, const uint8_t * End, uint16_t PrevCRC = 0)
    {
        const uint16_t* Table = _Table;
        uint16_t CRC = PrevCRC;
        while (Begin < End)
        {
            CRC = (CRC >> 8) ^ Table[(CRC ^ *Begin++) & 0xff];
        }
        return CRC;
    }
 
private:
 
    ULANGCORE_API static const uint16_t* _Table;
};
 
class CCRC32
{
public:
 
    ULANG_FORCEINLINE static uint32_t Generate(const uint8_t * Begin, const uint8_t * End, uint32_t PrevCRC = 0)
    {
        const uint32_t* Table = _Table;
        uint32_t CRC = PrevCRC;
        while (Begin < End)
        {
            CRC = (CRC >> 8) ^ Table[(CRC ^ *Begin++) & 0xff];
        }
        return CRC;
    }
 
private:
 
    ULANGCORE_API static const uint32_t* _Table;
};
 
class CCRC64
{
public:
 
    static uint64_t GenerateSlow(const uint8_t* Begin, const uint8_t* End, uint64_t PrevCRC = 0);
};
 
} // namespace uLang