lowlevellibsandfws/apputils/src/BADICTIONARYCOMPRESSION.CPP
author William Roberts <williamr@symbian.org>
Fri, 23 Jul 2010 16:09:54 +0100
branchGCC_SURGE
changeset 47 d7383dba13ba
parent 0 e4d67989cc36
permissions -rw-r--r--
Reapply fix for EXPORT_C problem in backend.dll, which got lost in the merge - bug 2971
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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// Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include <e32std.h>
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#include <baflpan.h>
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#include "BADICTIONARYCOMPRESSION.H"
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RDictionaryCompressionBitStream::RDictionaryCompressionBitStream() :
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	iNumberOfBitsUsedForDictionaryTokens(0),
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	iOffsetToFirstBit(-1),
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	iOffsetToCurrentBit(-1),
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	iOffsetOnePastLastBit(-1),
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	iOwnsBitBuffer(EFalse),
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	iBuffer(NULL),
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	iAssertObj()
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	{
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	}
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void RDictionaryCompressionBitStream::OpenL(
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				TInt aNumberOfBitsUsedForDictionaryTokens,
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				TInt aOffsetToFirstBit,
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				TInt aOffsetOnePastLastBit,
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				TBool aTransferringOwnershipOfBuffer,
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				TUint8* aBuffer,
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				const TBaAssert& aAssertObj)
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	{
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	iNumberOfBitsUsedForDictionaryTokens = aNumberOfBitsUsedForDictionaryTokens;
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	iOffsetToFirstBit = aOffsetToFirstBit;
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	iOffsetToCurrentBit = aOffsetToFirstBit;
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	iOffsetOnePastLastBit = aOffsetOnePastLastBit;
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	iOwnsBitBuffer = aTransferringOwnershipOfBuffer;
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	iBuffer = aBuffer;
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	iAssertObj = aAssertObj;
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	iAssertObj.AssertDebL(aBuffer!=NULL,EBafPanicNullPointer);
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	iAssertObj.AssertDebL(aOffsetToFirstBit>=0,EBafPanicNegativeOffsetToFirstBit1);
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	iAssertObj.AssertDebL(aOffsetToFirstBit<=aOffsetOnePastLastBit,EBafPanicNegativeLengthOfBitBuffer);
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	}
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void RDictionaryCompressionBitStream::Close()
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	{
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	if (iOwnsBitBuffer)
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		{
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		iOwnsBitBuffer=EFalse;
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		delete [] iBuffer;
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		}
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	iBuffer=NULL;
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	}
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TBool RDictionaryCompressionBitStream::EndOfStreamL() const
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	{
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	__ASSERT_DEBUG(iBuffer!=NULL,Panic(EBafPanicNotConstructed1));
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	iAssertObj.AssertDebL(iOffsetToFirstBit>=0,EBafPanicNegativeOffsetToFirstBit2);
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	iAssertObj.AssertDebL(iOffsetToCurrentBit>=iOffsetToFirstBit,EBafPanicBadCurrentBitPosition1);
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	iAssertObj.AssertDebL(iOffsetToCurrentBit<=iOffsetOnePastLastBit,EBafPanicBadCurrentBitPosition2);
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	return iOffsetToCurrentBit>=iOffsetOnePastLastBit;
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	}
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TInt RDictionaryCompressionBitStream::IndexOfDictionaryEntryL()
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	{
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	// increments the current bit-position if it returns a value >=0; returns KErrNotFound if the next thing in the stream is plain data rather than the index of a dictionary entry
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	__ASSERT_DEBUG(iBuffer!=NULL,Panic(EBafPanicNotConstructed2));
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	iAssertObj.AssertDebL(!EndOfStreamL(),EBafPanicEndOfStream1);
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	if (!CurrentBitIsOn())
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		{
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		++iOffsetToCurrentBit;
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		return ReadIntegerL(iNumberOfBitsUsedForDictionaryTokens);
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		}
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	return KErrNotFound;
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	}
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void RDictionaryCompressionBitStream::ReadL(TDes8& aBufferToAppendTo,TBool aCalypsoFileFormat)
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	{
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	// can only be called if IndexOfDictionaryEntry returned a negative value
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	__ASSERT_DEBUG(iBuffer!=NULL,Panic(EBafPanicNotConstructed3));
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	iAssertObj.AssertDebL(!EndOfStreamL(),EBafPanicEndOfStream2);
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	TInt numberOfConsecutivePrefixBits=0;
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	TInt i;
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	for (i=0; i<4; ++i)
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		{
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		const TBool currentBitIsOn=CurrentBitIsOn();
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		++iOffsetToCurrentBit; // increment this regardless whether the current bit is on
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		if (!currentBitIsOn)
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			{
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			break;
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			}
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		++numberOfConsecutivePrefixBits;
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		}
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	iAssertObj.AssertDebL(numberOfConsecutivePrefixBits>0,EBafPanicBadNumberOfConsecutivePrefixBits1);
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	iAssertObj.AssertDebL(numberOfConsecutivePrefixBits<=4,EBafPanicBadNumberOfConsecutivePrefixBits2);
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	TInt numberOfBytesToRead;
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	if (numberOfConsecutivePrefixBits==3)
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		{
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		numberOfBytesToRead=3+ReadIntegerL(3);
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		}
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	else if (numberOfConsecutivePrefixBits==4)
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		{
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   110
		numberOfBytesToRead=ReadIntegerL(8);
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   111
		if (!aCalypsoFileFormat)
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   112
			{
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   113
			numberOfBytesToRead+=3+(1<<3);
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   114
			}
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		}
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	else
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   117
		{
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		numberOfBytesToRead=numberOfConsecutivePrefixBits;
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		}
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	const TInt numberOfBitsOffByteBoundary=iOffsetToCurrentBit%8;
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	const TUint8* currentByte=iBuffer+(iOffsetToCurrentBit/8);
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	iAssertObj.AssertDebL(
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		(numberOfBytesToRead + aBufferToAppendTo.Length()) <= aBufferToAppendTo.MaxLength(),
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		EBafPanicBufLength);
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	for (i=0; i<numberOfBytesToRead; ++i, ++currentByte)
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   126
		{
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		TUint byte=*currentByte;
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		iAssertObj.AssertDebL(numberOfBitsOffByteBoundary>=0,EBafPanicBadNumberOfBitsOffByteBoundary1);
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   129
		if (numberOfBitsOffByteBoundary>0)
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   130
			{
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   131
			byte>>=numberOfBitsOffByteBoundary;
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			byte|=(*(currentByte+1)<<(8-numberOfBitsOffByteBoundary));
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   133
			byte&=0xff;
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   134
			}
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   135
		aBufferToAppendTo.Append(byte);
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   136
		}
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   137
	iOffsetToCurrentBit+=numberOfBytesToRead*8;
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	iAssertObj.AssertDebL(numberOfBitsOffByteBoundary==iOffsetToCurrentBit%8,EBafPanicBadNumberOfBitsOffByteBoundary2);
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   139
	}
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   140
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   141
TBool RDictionaryCompressionBitStream::CurrentBitIsOn() const
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   142
	{
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   143
	// does not increment the current bit-position
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   144
	__ASSERT_DEBUG(iBuffer!=NULL,Panic(EBafPanicNotConstructed4));
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   145
	return iBuffer[iOffsetToCurrentBit/8]&(1<<(iOffsetToCurrentBit%8));
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   146
	}
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   147
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   148
TUint RDictionaryCompressionBitStream::ReadIntegerL(TInt aNumberOfBits)
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   149
	{
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	// increments the current bit-position
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   151
	__ASSERT_DEBUG(iBuffer!=NULL,Panic(EBafPanicNotConstructed5));
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   152
	TInt integer=0;
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   153
	TInt numberOfBitsLeftToRead=aNumberOfBits;
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   154
	FOREVER
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   155
		{
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   156
		const TInt offsetToFirstBitToReadInCurrentByte=iOffsetToCurrentBit%8;
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   157
		const TInt offsetOnePastLastBitToReadInCurrentByte=Min(8,offsetToFirstBitToReadInCurrentByte+numberOfBitsLeftToRead);
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   158
		const TInt numberOfBitsReadFromCurrentByte=offsetOnePastLastBitToReadInCurrentByte-offsetToFirstBitToReadInCurrentByte;
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   159
		iAssertObj.AssertDebL(numberOfBitsReadFromCurrentByte>0,EBafPanicBadNumberOfBitsReadFromCurrentByte);
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   160
		const TUint bitsReadFromCurrentByte=((iBuffer[iOffsetToCurrentBit/8]>>offsetToFirstBitToReadInCurrentByte)&((1<<numberOfBitsReadFromCurrentByte)-1));
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   161
		integer|=(bitsReadFromCurrentByte<<(aNumberOfBits-numberOfBitsLeftToRead));
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   162
		iOffsetToCurrentBit+=numberOfBitsReadFromCurrentByte;
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   163
		numberOfBitsLeftToRead-=numberOfBitsReadFromCurrentByte;
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   164
		iAssertObj.AssertDebL(numberOfBitsLeftToRead>=0,EBafPanicBadNumberOfBitsLeftToRead);
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   165
		if (numberOfBitsLeftToRead<=0)
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   166
			{
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   167
			break;
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   168
			}
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   169
		}
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   170
	return integer;
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   171
	}
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diff changeset
   172