// Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

typedef unsigned char  BYTE;	// TUint8

typedef unsigned short WORD;	// TUint16

typedef unsigned int   UINT;	// TUint

#include <string.h>

#include <e32std.h>

#include <e32std_private.h>

#include "e32uid.h"

const UINT crcTab[256] =

    {

	0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,0x8108,0x9129,0xa14a,

	0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,

	0x72f7,0x62d6,0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,0x2462,

	0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,0xa56a,0xb54b,0x8528,0x9509,

	0xe5ee,0xf5cf,0xc5ac,0xd58d,0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,

	0x46b4,0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,0x48c4,0x58e5,

	0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,

	0x9969,0xa90a,0xb92b,0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12,

	0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,0x6ca6,0x7c87,0x4ce4,

	0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,

	0x8d68,0x9d49,0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,0xff9f,

	0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,0x9188,0x81a9,0xb1ca,0xa1eb,

	0xd10c,0xc12d,0xf14e,0xe16f,0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,

	0x6067,0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,0x02b1,0x1290,

	0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,

	0xe54f,0xd52c,0xc50d,0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405,

	0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,0x26d3,0x36f2,0x0691,

	0x16b0,0x6657,0x7676,0x4615,0x5634,0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,

	0xb98a,0xa9ab,0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,0xcb7d,

	0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,0x4a75,0x5a54,0x6a37,0x7a16,

	0x0af1,0x1ad0,0x2ab3,0x3a92,0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,

	0x8dc9,0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,0xef1f,0xff3e,

	0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,

	0x3eb2,0x0ed1,0x1ef0

    };

void Crc(WORD& aCrc,const void* aPtr,int aLength)

//

// Perform a CCITT CRC checksum.

//

	{

	const BYTE* pB=(const BYTE*)aPtr;

	const BYTE* pE=pB+aLength;

	UINT crc=aCrc;

    while (pB<pE)

		crc=(crc<<8)^crcTab[((crc>>8)^*pB++)&0xff];

	aCrc=(WORD)crc;

	}

UINT checkSum(const void* aPtr)

//

// Checksum every other byte

//

	{

	const BYTE* pB=(const BYTE*)aPtr;

	const BYTE* pE=pB+(KMaxCheckedUid*sizeof(TUid));

	BYTE buf[(KMaxCheckedUid*sizeof(TUid))>>1];

	BYTE* pT=(&buf[0]);

	while (pB<pE)

		{

		*pT++=(*pB);

		pB+=2;

		}

	WORD crc=0;

	Crc(crc,&buf[0],(KMaxCheckedUid*sizeof(TUid))>>1);

	return(crc);

	}

int TUid::operator==(const TUid& aUid) const

//

// Compare UID's for equality

//

	{

	return(iUid==aUid.iUid);

	}

int TUid::operator!=(const TUid& aUid) const

//

// Compare UID's for equality

//

	{

	return(iUid!=aUid.iUid);

	}

TUidType::TUidType()

//

// Constructor

//

    {

	memset(this,0,sizeof(TUidType));

    }

TUidType::TUidType(TUid aUid1)

//

// Constructor

//

    {

	memset(this,0,sizeof(TUidType));

    iUid[0]=aUid1;

    }

TUidType::TUidType(TUid aUid1,TUid aUid2)

//

// Constructor

//

    {

    iUid[0]=aUid1;

    iUid[1]=aUid2;

    iUid[2]=KNullUid;

    }

TUidType::TUidType(TUid aUid1,TUid aUid2,TUid aUid3)

//

// Constructor

//

    {

    iUid[0]=aUid1;

    iUid[1]=aUid2;

    iUid[2]=aUid3;

    }

int TUidType::operator==(const TUidType& aUidType) const

//

// TRUE if equal.

//

    {

    return(iUid[0]==aUidType.iUid[0] &&

           iUid[1]==aUidType.iUid[1] &&

           iUid[2]==aUidType.iUid[2]);

    }

int TUidType::operator!=(const TUidType& aUidType) const

//

// TRUE if not equal.

//

    {

    return(!(*this==aUidType));

    }

const TUid& TUidType::operator[](int anIndex) const

//

// Array operator.

//

    {

	return(iUid[anIndex]);

    }

TUid TUidType::MostDerived() const

//

// Return the most derived type

//

    {

    if (iUid[2]!=KNullUid)

        return(iUid[2]);

    if (iUid[1]!=KNullUid)

        return(iUid[1]);

    return(iUid[0]);

    }

int TUidType::IsPresent(TUid aUid) const

//

// TRUE if aUid is present as any type.

//

    {

	return(iUid[0]==aUid || iUid[1]==aUid || iUid[2]==aUid);

    }

int TUidType::IsValid() const

//

// TRUE if one of the type is not NULL.

//

    {

    return(MostDerived()!=KNullUid);

    }

TCheckedUid::TCheckedUid()

//

// Constructor

//

	{

	memset(this,0,sizeof(TCheckedUid));

	}

TCheckedUid::TCheckedUid(const TUidType& aUidType)

//

// Constructor

//

	{

    Set(aUidType);

    }

void TCheckedUid::Set(const TUidType& aUidType)

//

// Set from a aUidType

//

	{

    iType=aUidType;

    iCheck=Check();

    }

UINT TCheckedUid::Check() const

//

// Return the checksum of the UIDs

//

	{

	return((checkSum(((BYTE*)this)+1)<<16)|checkSum((BYTE*)this));

	}