/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

*

*/

#include <e32base.h>

#include <e32panic.h>

#include <s32file.h>

#include <s32ucmp.h>

void Mem::FillZ(TAny *aTrg, TInt aLength)

	{

	memset(aTrg, 0, aLength);

	}

TUint8* Mem::Move(TAny *aTrg, const TAny *aSrc, TInt aLength)

{

	TUint8 *s1 = (TUint8 *)aTrg;

	TUint8 *s2 = (TUint8 *)aSrc;

	memmove(s1, s2, aLength);

	return s2 + aLength;

}

const TUint 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

    };

static const TUint32 CrcTab32[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

	};

EXPORT_C void Mem::Crc(TUint16& aCrc,const TAny* aPtr,TInt aLength)

/**

Performs a CCITT CRC checksum on the specified data.

On return from this function, the referenced 16 bit integer contains the checksummed 

value.

@param aCrc    A reference to a 16 bit integer to contain the checksummed value. 

@param aPtr    A pointer to the start of the data to be checksummed. 

@param aLength The length of the data to be checksummed.

*/

	{

	const TUint8* pB=(const TUint8*)aPtr;

	const TUint8* pE=pB+aLength;

	TUint crc=aCrc;

    while (pB<pE)

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

	aCrc=(TUint16)crc;

	}

/**

Performs a CCITT CRC-32 checksum on the specified data.

On return from this function, the referenced 32 bit integer contains the CRC

value.

@param aCrc		A reference to a 32 bit integer to contain the CRC value. 

@param aPtr		A pointer to the start of the data to be checksummed. 

@param aLength	The length of the data to be checksummed.

*/

EXPORT_C void Mem::Crc32(TUint32& aCrc, const TAny* aPtr, TInt aLength)

	{

	const TUint8* p = (const TUint8*)aPtr;

	const TUint8* q = p + aLength;

	TUint32 crc = aCrc;

	while (p < q)

		crc = (crc >> 8) ^ CrcTab32[(crc ^ *p++) & 0xff];

	aCrc = crc;

	}

LOCAL_C TUint checkSum(const TAny *aPtr)

//

// Checksum every other byte

//

	{

	const TUint8* pB=(const TUint8*)aPtr;

	const TUint8* pE=pB+(KMaxCheckedUid*sizeof(TUid));

	TUint8 buf[(KMaxCheckedUid*sizeof(TUid))>>1];

	TUint8* pT=(&buf[0]);

	while (pB<pE)

		{

		*pT++=(*pB);

		pB+=2;

		}

	TUint16 crc=0;

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

	return(crc);

	}

EXPORT_C TCheckedUid::TCheckedUid()

/**

Default constructor.

Initialises the object to binary zeroes.

*/

	{

	//	Mem::FillZ(this,sizeof(TCheckedUid));

	iCheck = 0;

	}

EXPORT_C TCheckedUid::TCheckedUid(const TUidType& aUidType)

/**

Constructor taking an existing Uid type.

The constructor calculates a checksum.

@param aUidType The Uid type to be packaged.

*/

	{

    Set(aUidType);

    }

EXPORT_C TCheckedUid::TCheckedUid(const TDesC8& aPtr)

/**

Constructor taking an existing TCheckedUid object encapsulated within

a descriptor.

The checksum is recalculated and must match the checksum value passed in the 

encapsulated TCheckedUid object, otherwise the content of this object is reset 

to binary zeroes.

@param aPtr A pointer to a descriptor containing an existing TCheckedUid object. 

@panic USER 38 If the length of the descriptor is not the same as the size 

       of a TCheckedUid object.

*/

	{

	Set(aPtr);

	}

EXPORT_C void TCheckedUid::Set(const TUidType& aUidType)

/**

Sets the specified Uid type to be packaged, and recalculates the checksum.

@param aUidType The Uid type to be packaged.

*/

	{

    iType=aUidType;

    iCheck=Check();

    }

EXPORT_C void TCheckedUid::Set(const TDesC8& aPtr)

/**

Sets an existing TCheckedUid object encapsulated within a descriptor.

The checksum is recalculated and must match the checksum value passed in the 

encapsulated TCheckedUid object, otherwise the content of this object is reset 

to binary zeroes.

@param aPtr A pointer to a descriptor containing an existing

            TCheckedUid object.

@panic USER 38 If the length of the descriptor is not the same as the size 

       of a TCheckedUid object.

*/

	{

	__ASSERT_ALWAYS(aPtr.Length()==sizeof(TCheckedUid),Panic(ETFuncCheckedUidBadSet));

	Mem::Move(this,aPtr.Ptr(),sizeof(TCheckedUid));

	if (iCheck!=Check())

		Mem::FillZ(this,sizeof(TCheckedUid));

	}

EXPORT_C TPtrC8 TCheckedUid::Des() const

/**

Gets a pointer descriptor to represent this object's data.

@return The pointer descriptor for this object's data. The descriptor's length

        is the same as the length of a TCheckedUid object.

*/

	{

	return(TPtrC8((const TUint8*)this,sizeof(TCheckedUid)));

	}

EXPORT_C TUint TCheckedUid::Check() const

/**

Calculates the checksum of the UIDs.

@return The checksum.

*/

	{

	return((checkSum(((TUint8*)this)+1)<<16)|checkSum(this));

	}

EXPORT_C TUidType::TUidType()

/**

Default constructor.

Creates a UID type, and sets all three component UIDs to KNullUid.

*/

    {

	Mem::FillZ(this,sizeof(TUidType));

    }

EXPORT_C TUidType::TUidType(TUid aUid1)

/**

Constructor that creates a UID type and sets the UID1 component

to the specified value.

The UID2 and UID3 components are set to KNullUid.

@param aUid1 Value for UID1.

*/

    {

	Mem::FillZ(this,sizeof(TUidType));

    iUid[0]=aUid1;

    }

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

/**

Constructor that creates a UID type and sets the UID1 and UID2 components

to the specified values. 

The UID3 component is set to KNullUid.

@param aUid1 Value for UID1. 

@param aUid2 Value for UID2.

*/

    {

    iUid[0]=aUid1;

    iUid[1]=aUid2;

    iUid[2]=KNullUid;

    }

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

/**

Constructor that creates a UID type and sets all three UID components

to the specified values.

@param aUid1 Value for UID1.

@param aUid2 Value for UID2.

@param aUid3 Value for UID3.

*/

    {

    iUid[0]=aUid1;

    iUid[1]=aUid2;

    iUid[2]=aUid3;

    }

EXPORT_C TBool TUidType::operator==(const TUidType& aUidType) const

/**

Compares this UID type for equality with the specified UID type.

@param aUidType The UID type to be compared. 

@return True, if each component UID is equal to the corresponding component 

        UID in the specified UID type; false, otherwise.

*/

    {

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

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

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

    }

EXPORT_C TBool TUidType::operator!=(const TUidType& aUidType) const

/** 

Compares this UID type for inequality with the specified UID type.

@param aUidType The UID type to be compared.

@return True, if any component UID is not equal to the corresponding component 

UID in the specified UID type; false otherwise.

*/

    {

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

    }

EXPORT_C const TUid& TUidType::operator[](TInt aIndex) const

/**

Gets the UID component as identified by the specified index.

@param aIndex Index value indicating which UID component to return.

               0 specifies UID1,

               1 specifies UID2,

               2 specifies UID3.

@return A reference to the required UID component.

@panic USER 37 if aIndex is not in the range 0 to 2, inclusive.

*/

    {

	__ASSERT_ALWAYS(aIndex>=0 && aIndex<KMaxCheckedUid,Panic(ETFuncUidTypeBadIndex));

	return(iUid[aIndex]);

    }

EXPORT_C TUid TUidType::MostDerived() const

/**

Gets the most derived UID.

Taking the three UID components as a hierarchy with UID1 being the most general, 

UID2 being more specific than UID1 and UID3 being more specific than UID2, 

then the function returns:

UID3, if UID3 is not KNullUid.

UID2, if UID2 is not KNullUid.

UID1, otherwise

@return The most derived UID.

@see KNullUid

*/

    {

    if (iUid[2]!=KNullUid)

        return(iUid[2]);

    if (iUid[1]!=KNullUid)

        return(iUid[1]);

    return(iUid[0]);

    }

EXPORT_C TBool TUidType::IsPresent(TUid aUid) const

/**

Tests if any of the component UIDs are equal to the specified UID.

@param aUid The UID to be tested.

@return True, if any one of the component UIDs are the same as the specified 

        UID; false, if none of the component UIDs are the same.

*/

    {

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

    }

EXPORT_C TBool TUidType::IsValid() const

/**

Tests the object for a valid (non-KNullUid) UID type.

@return True, if at least one of the component UIDs is not KNullUid; false, 

        if all component UIDs are KNullUid.

@see KNullUid

*/

    {

    return(MostDerived()!=KNullUid);

    }

EXPORT_C void ExternalizeL(TInt64 anInt64,RWriteStream& aStream)

//

// Write a 64-bit integer out to aStream.

//

	{

	aStream.WriteUint32L(I64LOW(anInt64));

	aStream.WriteUint32L(I64HIGH(anInt64));

	}

EXPORT_C void InternalizeL(TInt64& anInt64,RReadStream& aStream)

//

// Read a 64-bit integer in from aStream.

//

	{

	TUint low=aStream.ReadUint32L();

	TUint high=aStream.ReadUint32L();

	anInt64 = MAKE_TINT64(high,low);

	}

EXPORT_C void ExternalizeL(const TCheckedUid& aUid,RWriteStream& aStream)

//

// Write a checked uid type out to aStream.

//

	{

	aStream.WriteL(aUid.Des());

	}

EXPORT_C void InternalizeL(TCheckedUid& aUid,RReadStream& aStream)

//

// Read a checked uid type in from aStream.

//

{

	TUint32 buf[4];

	TPtr8 des((TUint8 *)buf, sizeof(buf));

	aStream.ReadL(des);

	aUid.Set(des);

}

#if 0

EXPORT_C void ExternalizeL(TPoint aPoint,RWriteStream& aStream)

//

// Write a point out to aStream.

//

	{

	aStream.WriteInt32L(aPoint.iX);

	aStream.WriteInt32L(aPoint.iY);

	}

EXPORT_C void ExternalizeL(TSize aSize,RWriteStream& aStream)

//

// Write a size out to aStream.

//

	{

	aStream.WriteInt32L(aSize.iWidth);

	aStream.WriteInt32L(aSize.iHeight);

	}

EXPORT_C void ExternalizeL(const TRect& aRect,RWriteStream& aStream)

//

// Write a rectangle out to aStream.

//

	{

	aStream<<aRect.iTl;

	aStream<<aRect.iBr;

	}

EXPORT_C void InternalizeL(TPoint& aPoint,RReadStream& aStream)

//

// Read a point in from aStream.

//

	{

	aPoint.iX=aStream.ReadInt32L();

	aPoint.iY=aStream.ReadInt32L();

	}

EXPORT_C void InternalizeL(TSize& aSize,RReadStream& aStream)

//

// Read a size in from aStream.

//

	{

	aSize.iWidth=aStream.ReadInt32L();

	aSize.iHeight=aStream.ReadInt32L();

	}

EXPORT_C void InternalizeL(TRect& aRect,RReadStream& aStream)

//

// Read a rectangle in from aStream.

//

	{

	aStream>>aRect.iTl;

	aStream>>aRect.iBr;

	}

#endif

RWriteStream& operator<<(RWriteStream&aStream, const TDesHeader &aDesHeader)

{

	aDesHeader.ExternalizeL(aStream);

	return aStream;

}

RReadStream& operator>>(RReadStream&aStream,  TDesHeader &aDesHeader)

{

	aDesHeader.InternalizeL(aStream);

	return aStream;

}

EXPORT_C void ExternalizeL(const TDesC8& aDes8,RWriteStream& aStream)

//

// Write an 8-bit descriptor out to aStream.

//

	{

	TDesHeader header(aDes8);

	aStream<<header;

	aStream.WriteL(aDes8.Ptr(),aDes8.Length());

	}

RWriteStream& operator<<(RWriteStream&aStream, const TCardinality &aCardinality)

{

	aCardinality.ExternalizeL(aStream);

	return aStream;

}

RReadStream& operator>>(RReadStream&aStream,  TCardinality &aCardinality)

{

	aCardinality.InternalizeL(aStream);

	return aStream;

}

EXPORT_C void ExternalizeL(const TDesC16& aDes16,RWriteStream& aStream)

//

// Write a 16-bit descriptor out to aStream.

//

	{

	TDesHeader header(aDes16);

	aStream << header;

#ifdef _UNICODE

	// In the Unicode build, compress the data using the Standard Unicode Compression Scheme.

	TMemoryUnicodeSource source(aDes16.Ptr());

	TUnicodeCompressor compressor;

	compressor.CompressL(aStream,source,KMaxTInt,aDes16.Length());

#else

	aStream.WriteL(aDes16.Ptr(),aDes16.Length());

#endif

	}

EXPORT_C void InternalizeL(TDes8& aDes8,RReadStream& aStream)

//

// Read an 8-bit descriptor in from aStream.

//

	{

	TDesInternalizer interL;

	aStream>>interL.Header();

	interL(aDes8,aStream);

	}

EXPORT_C void InternalizeL(TDes16& aDes16,RReadStream& aStream)

//

// Read a 16-bit descriptor in from aStream.

//

	{

	TDesInternalizer interL;

	aStream>>interL.Header();

	interL(aDes16,aStream);

	}

inline TDesHeader::TDesHeader(const TDesC8& aDes8)

	: iVal((aDes8.Length()<<1)+1)

	{}

inline TDesHeader::TDesHeader(const TDesC16& aDes16)

	: iVal((aDes16.Length()<<1))

	{}

inline TDesHeader& TDesHeader::operator=(const TDesC8& aDes8)

	{return *this=TDesHeader(aDes8);}

inline TDesHeader& TDesHeader::operator=(const TDesC16& aDes16)

	{return *this=TDesHeader(aDes16);}

inline TBool TDesHeader::IsWidth8() const

	{return TInt(iVal)&0x1;}

inline TBool TDesHeader::IsWidth16() const

	{return !IsWidth8();}

inline TInt TDesHeader::Length() const

	{return TInt(iVal)>>1;}

inline void TDesHeader::ExternalizeL(RWriteStream& aStream) const

	{aStream<<iVal;}

inline void TDesHeader::InternalizeL(RReadStream& aStream)

	{aStream>>iVal;}

// An MUnicodeSink implementation to write Unicode values into 8-bit bytes; anything outside 0..255 becomes 1

#ifdef _UNICODE

class TNarrowUnicodeSink: public MUnicodeSink

	{

	public:

	TNarrowUnicodeSink(TUint8* aPtr): iPtr(aPtr) { }

	void WriteUnicodeValueL(TUint16 aValue) { *iPtr++ = (TUint8)(aValue > 255 ? 1 : aValue); }

	private:

	TUint8* iPtr;

	};

#endif

void TDesInternalizer::operator()(TDes8& aDes8,RReadStream& aStream) const

//

// Read an 8-bit descriptor in from aStream.

//

	{

	TInt len=iHeader.Length();

	if (len>aDes8.MaxLength())

		__LEAVE(KErrOverflow);

//

	TUint8* ptr=(TUint8*)aDes8.Ptr();

	if (iHeader.IsWidth8())

		aStream.ReadL(ptr,len);

	else

		{

		__ASSERT_DEBUG(iHeader.IsWidth16(),User::Invariant());

#ifdef _UNICODE

		// In the Unicode build 16-bit descriptors need to be expanded from the Standard Unicode Compression Scheme.

		TNarrowUnicodeSink sink(ptr);

		TUnicodeExpander expander;

		expander.ExpandL(sink,aStream,len);

#else

		TUint8* end=ptr+len;

		while (ptr!=end)

			{

			TUint c=aStream.ReadUint16L();

			if (c>=0x100)

				c=1;

			*ptr++=TUint8(c);

			}

#endif

		}

	aDes8.SetLength(len);

	}

void TDesInternalizer::operator()(TDes16& aDes16,RReadStream& aStream) const

//

// Read a 16-bit descriptor in from aStream.

//

	{

	TInt len=iHeader.Length();

	if (len>aDes16.MaxLength())

		__LEAVE(KErrOverflow);

//

	TUint16* ptr=(TUint16*)aDes16.Ptr();

	if (iHeader.IsWidth16())

		{

#ifdef _UNICODE

		// In the Unicode build 16-bit descriptors need to be expanded from the Standard Unicode Compression Scheme.

		TMemoryUnicodeSink sink(ptr);

		TUnicodeExpander expander;

		expander.ExpandL(sink,aStream,len);

#else

		aStream.ReadL(ptr,len);

#endif

		}

	else

		{

		__ASSERT_DEBUG(iHeader.IsWidth8(),User::Invariant());

		TUint16* end=ptr+len;

		while (ptr!=end)

			*ptr++=aStream.ReadUint8L();

		}

	aDes16.SetLength(len);

	}

// End of file