Humble Framework for SkyOS

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HCRC.h

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/****************************************************************************
**
**  $Header: /SkyOS.root/pig/Humble/HCRC.h 4     2/04/05 10:45a Neusel $
**
****************************************************************************/
#ifndef HCRC_H
    #define HCRC_H

class HCRC : public HObj
    {
    typedef HObj        base_class;
    static StringPtr    ClassName(void) { return "HCRC"; }

private:
    enum { kAllOnes = 0xFFFFFFFFUL };
/*  -----------------------------------------------------------------------
    VARIABLES
    ----------------------------------------------------------------------- */
protected:
    uint32              m_uCRC;         
/*  -----------------------------------------------------------------------
    CTOR / DTOR
    ----------------------------------------------------------------------- */
public:
    HCRC(void)
        { Start(); }
    ~HCRC(void)
        { /* EMPTY DTOR */ }
/*  -----------------------------------------------------------------------
    METHODS
    ----------------------------------------------------------------------- */
public:
    static ErrCode
    Compute(const HMemory & buffer, uint32 & uCRC)
        { return Compute( buffer.GetPtr(), buffer.GetSize(), uCRC); }
    static ErrCode
    Compute(PtrConst pData, uint32 uBytes, uint32 & uCRC)
        { 
        ErrCode     ec = HError::NoError();

        uCRC = kAllOnes;
        ec = compute(reinterpret_cast<PtrDataConst>(pData), uBytes, uCRC);
        uCRC ^= kAllOnes;

        return ec;
        }
    ErrCode
    Start(void)
        { 
        m_uCRC = kAllOnes; 
        return HError::NoError();
        }
    ErrCode
    Stop(uint32 & uCRC) const
        { 
        uCRC = Get(); 
        return HError::NoError();
        }
    ErrCode
    Update(PtrConst pData, uint32 uBytes)
        { return compute(reinterpret_cast<PtrDataConst>(pData), uBytes, m_uCRC); }

protected:
    static ErrCode
    compute(PtrDataConst pData, uint32 uBytes, uint32 & uCRC)
        {
        const uint32    crcTable[256] = 
            {
            0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
            0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
            0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
            0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
            0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
            0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
            0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
            0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
            0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
            0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
            0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
            0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
            0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
            0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
            0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
            0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,

            0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
            0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
            0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
            0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
            0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
            0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
            0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
            0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
            0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
            0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
            0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
            0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
            0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
            0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
            0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
            0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,

            0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
            0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
            0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
            0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
            0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
            0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
            0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
            0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
            0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
            0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
            0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
            0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
            0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
            0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
            0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
            0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,

            0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
            0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
            0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
            0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
            0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
            0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
            0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
            0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
            0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
            0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
            0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
            0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
            0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
            0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
            0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
            0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
            };

        ErrCode     ec = HError::NoError();
        
        if (GOOD_PTR(pData) && uBytes > 0)
            {
            while (uBytes-- > 0) 
                uCRC = (uCRC >> 8) ^ crcTable[(uCRC & 0xFF) ^ *pData++]; 
            }
        else if (uBytes > 0 && NULL_PTR(pData))
            ec = HError::Set(ERR_BAD_PARAMETER, __FILE__, __LINE__);

        return ec;
        }
/*  -----------------------------------------------------------------------
    INLINES
    ----------------------------------------------------------------------- */
public:
    inline uint32       Get(void) const
                            { return m_uCRC ^ kAllOnes; }
    };

#endif  // HCRC_H
/****************************************************************************
**
**  $History: HCRC.h $
 * 
 * *****************  Version 4  *****************
 * User: Neusel       Date: 2/04/05    Time: 10:45a
 * Updated in $/SkyOS.root/pig/Humble
 * 
 * *****************  Version 3  *****************
 * User: Neusel       Date: 12/08/04   Time: 5:06p
 * Updated in $/SkyOS.root/pig/Humble
 * 20041208
 * 
 * *****************  Version 2  *****************
 * User: Neusel       Date: 11/30/04   Time: 1:01p
 * Updated in $/SkyOS.root/pig/Humble
 * Released as HUMBLE_VER 20041130.
 * 
 * *****************  Version 1  *****************
 * User: Neusel       Date: 11/23/04   Time: 8:24a
 * Created in $/SkyOS.root/pig/Humble
**
**  -------------------------------------------------------------------------
**
**  End of HCRC.h
**
****************************************************************************/

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