// Copyright (c) 1998-2009 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:

//

#include "US_STD.H"

TInt TPtrInput::PushL(const TAny* aPtr,TInt aMaxLength)

//

// Accept the data, copying it to the buffer pointed to.

//

	{

	__ASSERT_DEBUG(aMaxLength>=0,Panic(EStreamPushLengthNegative));

	__ASSERT_DEBUG(aMaxLength>0,Panic(EStreamPushNoTransfer));

	iPtr=Mem::Copy(iPtr,aPtr,aMaxLength);

	return aMaxLength;

	}

TStreamTransfer TPtrInput::ReadFromL(MStreamBuf&,TStreamTransfer aTransfer)

//

// This input is passive.

//

	{

	__ASSERT_DEBUG(aTransfer>0,Panic(EStreamReadNoTransfer));

	return aTransfer;

	}

TInt TPtrOutput::PullL(TAny* aPtr,TInt aMaxLength)

//

// Produce data from the buffer pointed to.

//

	{

	__ASSERT_DEBUG(aMaxLength>=0,Panic(EStreamPullLengthNegative));

	__ASSERT_DEBUG(aMaxLength>0,Panic(EStreamPullNoTransfer));

	Mem::Copy(aPtr,iPtr,aMaxLength);

	iPtr+=aMaxLength;

	return aMaxLength;

	}

TStreamTransfer TPtrOutput::WriteToL(MStreamBuf&,TStreamTransfer aTransfer)

//

// This output is passive.

//

	{

	__ASSERT_DEBUG(aTransfer>0,Panic(EStreamWriteNoTransfer));

	return aTransfer;

	}

TInt TNullInput::PushL(const TAny*,TInt aMaxLength)

//

// Accept and discard the data.

//

	{

	__ASSERT_DEBUG(aMaxLength>=0,Panic(EStreamPushLengthNegative));

	__ASSERT_DEBUG(aMaxLength>0,Panic(EStreamPushNoTransfer));

	return aMaxLength;

	}

TStreamTransfer TNullInput::ReadFromL(MStreamBuf& aSource,TStreamTransfer aTransfer)

//

// Read and discard data from aSource using a temporary buffer.

//

	{

	__ASSERT_DEBUG(aTransfer>0,Panic(EStreamReadNoTransfer));

	do

		{

		TUint8 buf[KDefaultIoBufSize];

		TInt len=aSource.ReadL(buf,aTransfer[sizeof(buf)]);

		__ASSERT_DEBUG(len>=0&&len<=aTransfer[sizeof(buf)],Panic(EStreamReadInBreach));

		if (len==0)

			break;

//

		aTransfer-=len;

		} while (aTransfer>0);

	return aTransfer;

	}

TInt TSourceOutput::PullL(TAny* aPtr,TInt aMaxLength)

//

// Pull up to aMaxLength bytes of data from this output's source.

//

	{

	__ASSERT_DEBUG(aMaxLength>=0,Panic(EStreamPullLengthNegative));

	__ASSERT_DEBUG(aMaxLength>0,Panic(EStreamPullNoTransfer));

	__ASSERT_DEBUG(iSrc!=NULL,User::Invariant());

//

	TPtrInput input(aPtr);

	TInt len=iSrc->ReadL(input,aMaxLength);

	__ASSERT_DEBUG(len>=0&&len<=aMaxLength,Panic(EStreamReadInBreach));

	return len;

	}

TStreamTransfer TSourceOutput::WriteToL(MStreamBuf& aSink,TStreamTransfer aTransfer)

//

// Write data from this output's source to aSink using a temporary buffer.

//

	{

	__ASSERT_DEBUG(aTransfer>0,Panic(EStreamWriteNoTransfer));

	__ASSERT_DEBUG(iSrc!=NULL,User::Invariant());

	do

		{

		TUint8 buf[KDefaultIoBufSize];

		TInt len=iSrc->ReadL(buf,aTransfer[sizeof(buf)]);

		__ASSERT_DEBUG(len>=0&&len<=aTransfer[sizeof(buf)],Panic(EStreamReadInBreach));

		if (len==0)

			break;

//

		aSink.WriteL(buf,len);

		aTransfer-=len;

		} while (aTransfer>0);

	return aTransfer;

	}

TInt TFilterInput::PushL(const TAny* aPtr,TInt aMaxLength)

//

// Put up to aMaxLength bytes of data through the filter.

//

	{

	__ASSERT_DEBUG(aMaxLength>=0,Panic(EStreamPushLengthNegative));

	__ASSERT_DEBUG(aMaxLength>0,Panic(EStreamPushNoTransfer));

	__ASSERT_DEBUG(!Eof(),Panic(EStreamReadInBreach));

	__ASSERT_DEBUG(iFltr!=NULL&&iLeft>=0,User::Invariant());

	if (Done())

		return 0;

//

	const TUint8* from=(TUint8*)aPtr;

	TInt len=iFltr->FilterL(iPtr,iLeft,from,from+aMaxLength);

	__ASSERT_DEBUG(len>=0&&len<=iLeft,Panic(EStreamFilterInBreach));

	__ASSERT_DEBUG(from>=(TUint8*)aPtr&&from<=(TUint8*)aPtr+aMaxLength,Panic(EStreamFilterInBreach));

	__ASSERT_DEBUG(len==iLeft||from==(TUint8*)aPtr+aMaxLength,Panic(EStreamFilterInBreach));

	iPtr+=len;

	iLeft-=len;

	return from-(TUint8*)aPtr;

	}

TStreamTransfer TFilterInput::ReadFromL(MStreamBuf& aSource,TStreamTransfer aTransfer)

//

// Put data read from aSource through the filter using a temporary buffer.

//

	{

	__ASSERT_DEBUG(aTransfer>0,Panic(EStreamReadNoTransfer));

	__ASSERT_DEBUG(iFltr!=NULL&&iLeft>=0,User::Invariant());

	if (Done())

		return aTransfer;

//

	TUint8 buf[KFilterIoBufSize];

	TInt cap=aTransfer[Min(iFltr->Capacity(iLeft),sizeof(buf))];

	const TUint8* end=buf+(cap==0?0:aSource.ReadL(buf,cap));

	__ASSERT_DEBUG(end>=buf&&end<=buf+cap&&(!Eof()||end==buf),Panic(EStreamReadInBreach));

	const TUint8* from=buf;

	TInt len=iFltr->FilterL(iPtr,iLeft,from,end);

	__ASSERT_DEBUG(len>=0&&len<=iLeft,Panic(EStreamFilterInBreach));

	__ASSERT_DEBUG(from==end,Panic(EStreamFilterInBreach));

	if (end==buf && len==0)	// no input && no output, => end of stream

		iPtr=NULL;

	else

		iPtr+=len;

	iLeft-=len;

	return aTransfer-(from-buf);

	}

TInt TFilterOutput::PullL(TAny* aPtr,TInt aMaxLength)

//

// Pull up to aMaxLength bytes of data through the filter.

//

	{

	__ASSERT_DEBUG(aMaxLength>=0,Panic(EStreamPullLengthNegative));

	__ASSERT_DEBUG(aMaxLength>0,Panic(EStreamPullNoTransfer));

	__ASSERT_DEBUG(iFltr!=NULL&&iFrom!=NULL&&iFrom<=iEnd,User::Invariant());

	if (Done())

		return 0;

//

	__DEBUG(const TUint8* from=iFrom);

	TInt len=iFltr->FilterL(aPtr,aMaxLength,iFrom,iEnd);

	__ASSERT_DEBUG(len>=0&&len<=aMaxLength,Panic(EStreamFilterInBreach));

	__ASSERT_DEBUG(iFrom>=from&&iFrom<=iEnd,Panic(EStreamFilterInBreach));

	__ASSERT_DEBUG(len==aMaxLength||iFrom==iEnd,Panic(EStreamFilterInBreach));

	return len;

	}

TStreamTransfer TFilterOutput::WriteToL(MStreamBuf& aSink,TStreamTransfer aTransfer)

//

// Write data put through the filter to aSink using a temporary buffer.

//

	{

	__ASSERT_DEBUG(aTransfer>0,Panic(EStreamWriteNoTransfer));

	__ASSERT_DEBUG(iFltr!=NULL&&iFrom!=NULL&&iFrom<=iEnd,User::Invariant());

	if (Done())

		return aTransfer;

//

	TUint8 buf[KFilterIoBufSize];

	__DEBUG(const TUint8* from=iFrom);

	TInt len=iFltr->FilterL(buf,aTransfer[sizeof(buf)],iFrom,iEnd);

	__ASSERT_DEBUG(len>=0&&len<=aTransfer[sizeof(buf)],Panic(EStreamFilterInBreach));

	__ASSERT_DEBUG(iFrom>=from&&iFrom<=iEnd,Panic(EStreamFilterInBreach));

	__ASSERT_DEBUG(len==aTransfer[sizeof(buf)]||iFrom==iEnd,Panic(EStreamFilterInBreach));

	if (len>0)

		aSink.WriteL(buf,len);

	return aTransfer-len;

	}

TDelimitedInput8::TDelimitedInput8(TUint8* aPtr,TInt aLength,TChar aDelim)

	: iPtr(aPtr),iLeft(aLength),iDelim(aDelim)

	{}

TInt TDelimitedInput8::PushL(const TAny* aPtr,TInt aMaxLength)

//

// Push 8-bit text into this input buffer up to the first occurrence of the delimiter.

//

	{

	TInt len=Min(aMaxLength,iLeft);

	TInt d=TPtrC8((TUint8*)aPtr,len).Locate(iDelim)+1;

	if (d<=0)

		{

		d=len;

		iLeft-=len;

		}

	else

		iLeft=0;

	iPtr=(TUint8*)Mem::Copy(iPtr,aPtr,d);

	return d;

	}

TStreamTransfer TDelimitedInput8::ReadFromL(MStreamBuf& aSource,TStreamTransfer aTransfer)

//

// Read a single 8-bit text character from aSource, testing it against the delimiter.

//

	{

	if (Done())

		return aTransfer;

//

	RReadStream stream(&aSource);

	TUint8 c=stream.ReadUint8L();

	*iPtr++=c;

	if (c==(TUint8)iDelim)

		iLeft=0;

	else

		--iLeft;

	return aTransfer-sizeof(c);

	}

TDelimitedInput16::TDelimitedInput16(TUint16* aPtr,TInt aLength,TChar aDelim)

	: iPtr(aPtr),iLeft(aLength),iDelim(aDelim)

	{}

TInt TDelimitedInput16::PushL(const TAny* aPtr,TInt aMaxLength)

//

// Push 16-bit text into this input buffer up to the first occurrence of the delimiter.

// We cannot use TPtrC16 here as the data may not be half-word aligned

//

	{

	TInt len=Min(aMaxLength>>1,iLeft);

	iLeft-=len;

	TInt lbyte=iDelim&0xffu;

	TInt hbyte=iDelim>>8;

	const TUint8* p=static_cast<const TUint8*>(aPtr);

	TInt d=0;

	while (d<len)

		{

		if (p[d<<1]==lbyte && p[(d<<1)+1]==hbyte) // platform dependency

			{

			++d;		// include the delimiter

			iLeft=0;	// found a match

			break;

			}

		++d;

		}

	iPtr=(TUint16*)Mem::Copy(iPtr,aPtr,d<<1); // platform dependency

	return d<<1;

	}

TStreamTransfer TDelimitedInput16::ReadFromL(MStreamBuf& aSource,TStreamTransfer aTransfer)

//

// Read a single 16-bit text character from aSource, testing it against the delimiter.

//

	{

	if (Done())

		return aTransfer;

//

	RReadStream stream(&aSource);

	TUint16 c=stream.ReadUint16L();

//

	*iPtr++=c;

	if (c==(TUint16)iDelim)

		iLeft=0;

	else

		--iLeft;

	return aTransfer-sizeof(c);

	}