sl@0: // Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // f32\sfile\sf_pgcompr.cpp
sl@0: // 
sl@0: //
sl@0: 
sl@0: #include <f32file.h>
sl@0: #include "sf_std.h"
sl@0: #include "sf_ldr.h"
sl@0: #include <f32image.h>
sl@0: #include "sf_image.h"
sl@0: #include <e32uid.h>
sl@0: #include <e32rom.h>
sl@0: #include "sf_cache.h"
sl@0: 
sl@0: #include "sf_pgcompr.h"
sl@0: 
sl@0: extern TInt BytePairDecompress(TUint8* /*dst*/, TInt /*dstSize*/, TUint8* /*src*/, TInt /*srcSize*/, TUint8*& /*srcNext*/);
sl@0: 
sl@0: 
sl@0: // CBytePairReader - reading from in-memory buffer
sl@0: 
sl@0: 
sl@0: CBytePairReader* CBytePairReader::NewLC(TUint8* aBuffer, TUint32 aLength)
sl@0: 	{
sl@0: 	CBytePairReader* reader = new (ELeave) CBytePairReader(aBuffer, aLength);
sl@0: 	CleanupStack::PushL(reader);
sl@0: 	return reader;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: CBytePairReader::CBytePairReader(TUint8* aBuffer, TUint32 aLength)
sl@0: 	: iNextPage(aBuffer), iBytesLeft(aLength)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CBytePairReader::SeekForwardL(TUint aBytes)
sl@0: 	{
sl@0: 	if (iBytesLeft < aBytes)
sl@0: 		LEAVE_FAILURE(KErrCorrupt);
sl@0: 	iNextPage += aBytes;
sl@0: 	iBytesLeft -= aBytes;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CBytePairReader::ReadInTableL()
sl@0: 	{
sl@0: 	if (KIndexTableHeaderSize > iBytesLeft)
sl@0: 		LEAVE_FAILURE(KErrCorrupt);
sl@0: 	Mem::Copy(&iHeader, iNextPage, KIndexTableHeaderSize);
sl@0: 	iNextPage += KIndexTableHeaderSize;
sl@0: 	iBytesLeft -= KIndexTableHeaderSize;
sl@0: 	
sl@0: 	__IF_DEBUG(Printf("numberOfPages:%d", iHeader.iNumberOfPages));
sl@0: 	
sl@0: 	TUint size = iHeader.iNumberOfPages * sizeof(TUint16);
sl@0: 	if (size > iBytesLeft)
sl@0: 		LEAVE_FAILURE(KErrCorrupt);
sl@0: 	// coverity[buffer_alloc]
sl@0: 	iIndexTable = new (ELeave) TUint16[size/sizeof(TUint16)];
sl@0: 	Mem::Copy(iIndexTable, iNextPage, size);
sl@0: 	iNextPage += size;
sl@0: 	iBytesLeft -= size;
sl@0: 	} 
sl@0: 
sl@0: 
sl@0: void CBytePairReader::ReleaseTable()
sl@0: 	{
sl@0: 	delete[] iIndexTable;
sl@0: 	iIndexTable = NULL;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TUint CBytePairReader::GetPageL(TUint aPageNum, TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMoveFn)
sl@0: 	{
sl@0: 	if (iIndexTable[aPageNum] > iBytesLeft)
sl@0: 		LEAVE_FAILURE(KErrCorrupt);
sl@0: 	iBytesLeft -= iIndexTable[aPageNum];
sl@0: 	aLength = Min(aLength, KBytePairPageSize);
sl@0: 
sl@0: 	TInt size;
sl@0: 	TUint8* nextPage;
sl@0: 
sl@0: 	if (aMemMoveFn)
sl@0: 		size = BytePairDecompress(iPageBuf, aLength, iNextPage, iIndexTable[aPageNum], nextPage);
sl@0: 	else
sl@0: 		size = BytePairDecompress(aTarget, aLength, iNextPage, iIndexTable[aPageNum], nextPage);
sl@0: 		
sl@0: 	User::LeaveIfError(size);
sl@0: 	if (size != aLength)
sl@0: 		LEAVE_FAILURE(KErrCorrupt);
sl@0: 	if (iNextPage + iIndexTable[aPageNum] != nextPage)
sl@0: 		LEAVE_FAILURE(KErrCorrupt);
sl@0: 
sl@0: 	// If a memmove() was provided, use that to copy the data to its final target
sl@0: 	if (aMemMoveFn)
sl@0: 		aMemMoveFn(aTarget, iPageBuf, size);
sl@0: 
sl@0: 	iNextPage = nextPage;
sl@0: 	return size;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TUint CBytePairReader::DecompressPagesL(TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMoveFn)
sl@0: 	{
sl@0: 	TUint decompressedSize = 0;
sl@0: 
sl@0: 	ReadInTableL();
sl@0: 	
sl@0: 	for (TUint curPage = 0; curPage < iHeader.iNumberOfPages; ++curPage)
sl@0: 		{
sl@0: 		TUint size = GetPageL(curPage, aTarget, aLength, aMemMoveFn);
sl@0: 		
sl@0: 		decompressedSize += size;
sl@0: 		aTarget += size;
sl@0: 		aLength -= size;
sl@0: 		
sl@0: 		__IF_DEBUG(Printf("decomp page size:%d\n", size ));
sl@0: 		} 
sl@0: 	
sl@0: 	__IF_DEBUG(Printf("decompressedSize:%d", decompressedSize));
sl@0: 
sl@0: 	ReleaseTable();
sl@0: 
sl@0: 	return decompressedSize;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CBytePairReader::GetPageOffsetsL(TInt32 aInitialOffset, TInt& aPageCount, TInt32*& aPageOffsets)
sl@0: 	{
sl@0: 	ReadInTableL();
sl@0: 	aPageCount = iHeader.iNumberOfPages;
sl@0: 	aPageOffsets = new (ELeave) TInt32[aPageCount+1];
sl@0: 
sl@0: 	TInt bytes = aInitialOffset + KIndexTableHeaderSize + aPageCount * sizeof(TUint16);
sl@0: 	for (TInt i = 0; i < aPageCount; ++i)
sl@0: 		{
sl@0: 		aPageOffsets[i] = bytes;
sl@0: 		bytes += iIndexTable[i];
sl@0: 		}
sl@0: 	aPageOffsets[aPageCount] = bytes;
sl@0: 
sl@0: 	ReleaseTable();
sl@0: 	}
sl@0: 
sl@0: 
sl@0: // CBytePairFileReader - reading from file
sl@0: 
sl@0: 
sl@0: CBytePairFileReader* CBytePairFileReader::NewLC(RFile& aFile)
sl@0: 	{
sl@0: 	CBytePairFileReader* reader = new (ELeave) CBytePairFileReader(aFile);
sl@0: 	CleanupStack::PushL(reader);
sl@0: 	return reader;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: CBytePairFileReader::CBytePairFileReader(RFile& aFile)
sl@0: 	: CBytePairReader(NULL, 0), iFile(aFile)
sl@0: 	{
sl@0: 	}	
sl@0: 
sl@0: 
sl@0: CBytePairFileReader::~CBytePairFileReader()
sl@0: 	{
sl@0: 	ReleaseTable();
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CBytePairFileReader::SeekForwardL(TUint aBytes)
sl@0: 	{
sl@0: 	TInt bytes = aBytes;
sl@0: 	User::LeaveIfError(iFile.Seek(ESeekCurrent, bytes));
sl@0: 	}
sl@0: 	
sl@0: 
sl@0: void CBytePairFileReader::ReadInTableL()
sl@0: 	{
sl@0: 	TPtr8 header((TUint8*)&iHeader, KIndexTableHeaderSize);
sl@0: 	User::LeaveIfError(iFile.Read(header, KIndexTableHeaderSize));
sl@0: 	if (header.Length() != (TInt)KIndexTableHeaderSize)
sl@0: 		LEAVE_FAILURE(KErrCorrupt);
sl@0: 	
sl@0: 	__IF_DEBUG(Printf("numberOfPages:%d", iHeader.iNumberOfPages));
sl@0: 	
sl@0: 	TInt size = iHeader.iNumberOfPages * sizeof(TUint16);
sl@0: 	iIndexTable = new (ELeave) TUint16[size/sizeof(TUint16)];
sl@0: 	TPtr8 indexTable((TUint8*)iIndexTable, size);
sl@0: 	User::LeaveIfError(iFile.Read(indexTable, size));
sl@0: 	if (indexTable.Length() != size)
sl@0: 		LEAVE_FAILURE(KErrCorrupt);
sl@0: 	} 
sl@0: 
sl@0: 
sl@0: TUint CBytePairFileReader::DecompressPagesL(TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMoveFn)
sl@0: 	{
sl@0: 	TUint decompressedSize = 0;
sl@0: 
sl@0: 	ReadInTableL();
sl@0: 	
sl@0: 	TUint curPage = 0;
sl@0: 	while (curPage < iHeader.iNumberOfPages)
sl@0: 		{
sl@0: 		TUint bytes = 0;
sl@0: 		TUint pages = 0;
sl@0: 		while (curPage + pages < iHeader.iNumberOfPages &&
sl@0: 			   bytes + iIndexTable[curPage+pages] < sizeof(iBuffer))
sl@0: 			{
sl@0: 			bytes += iIndexTable[curPage+pages];
sl@0: 			++pages;
sl@0: 			}
sl@0: 		if(!bytes)
sl@0: 			LEAVE_FAILURE(KErrCorrupt);
sl@0: 		TPtr8 data(iBuffer, bytes);
sl@0: 		User::LeaveIfError(iFile.Read(data, bytes));
sl@0: 		if (data.Length() != (TInt)bytes)
sl@0: 			LEAVE_FAILURE(KErrCorrupt);
sl@0: 		iNextPage = iBuffer;
sl@0: 		iBytesLeft = bytes;
sl@0: 
sl@0: 		for (; pages; ++curPage, --pages)
sl@0: 			{
sl@0: 			TUint size = GetPageL(curPage, aTarget, aLength, aMemMoveFn);
sl@0: 		
sl@0: 			decompressedSize += size;
sl@0: 			aTarget += size;
sl@0: 			aLength -= size;
sl@0: 		
sl@0: 			__IF_DEBUG(Printf("decomp page size:%d\n", size ));
sl@0: 			}
sl@0: 		} 
sl@0: 	
sl@0: 	__IF_DEBUG(Printf("decompressedSize:%d", decompressedSize));
sl@0: 
sl@0: 	ReleaseTable();
sl@0: 
sl@0: 	return decompressedSize;
sl@0: 	}