bintools/rcomp/inc/UNICODE_COMPRESSOR.H
author Alex Gilkes <alex.gilkes@nokia.com>
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/*
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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 the License "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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* the API to the Unicode compressor
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*
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*/
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#include "wide.h"
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extern void CompressUnicode(unsigned char* aOutputBuffer, int& aOutputLength, int aMaximumOutputLength, const UTF16* aInputBuffer, int aInputLength);
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// the Symbian things that the Symbian Unicode-compression classes use
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#define IMPORT_C
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#define EXPORT_C
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#ifdef __TOOLS2__ // If TOOLS2 defined, use the definition of NULL as supplied in stddef.h
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#include <stddef.h> 
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#else
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#define NULL 0
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#endif // !__TOOLS2__
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#define TRUE true
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#define FALSE false
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typedef unsigned char TUint8;
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typedef unsigned short TUint16;
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typedef unsigned long TUint32;
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typedef unsigned int TUint;
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typedef int TInt;
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typedef bool TBool;
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const TInt KMaxTInt = 0x7fffffff;
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const TInt KErrNotFound = -1;
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class RWriteStream;
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extern void Panic(int aCode);
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// the rest of the contents of this file is a selective copy of base\store\inc\S32UCMP.H
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class TUnicodeCompressionState
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	{
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	public:
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	TUnicodeCompressionState();
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	void Reset();
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	static TInt StaticWindowIndex(TUint16 aCode);
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	static TInt DynamicWindowOffsetIndex(TUint16 aCode);
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	static TUint32 DynamicWindowBase(TInt aOffsetIndex);
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	static TBool EncodeAsIs(TUint16 aCode);
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	enum TPanic
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		{
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		EUnhandledByte,			// expander code fails to handle all possible byte codes
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		ENotUnicode,			// expander can't handle Unicode values outside range 0x0..0x10FFFF;
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								// that is, 16-bit codes plus 32-bit codes that can be expressed using
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								// 16-bit surrogates
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		EOutputBufferOverflow	// output buffer is not big enough
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		,ECannotUseStreams // not in the file from which this file is derived (i.e. not in base\store\inc\S32UCMP.H)
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		};
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	static void Panic(TPanic aPanic);
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	protected:
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	enum
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		{
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		EStaticWindows = 8,
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		EDynamicWindows = 8,
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		ESpecialBases = 7
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		};
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	TBool iUnicodeMode;									// TRUE if in Unicode mode as opposed to single-byte mode
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	TUint32 iActiveWindowBase;							// base of the active window - bases are 32-bit because they
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														// can be set to the surrogate area, which represents codes
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														// from 0x00010000 to 0x0010FFFF - planes 1-16 of ISO-10646.
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	static const TUint32 iStaticWindow[EStaticWindows];	// bases of the static windows
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	static const TUint32 iDynamicWindowDefault[EDynamicWindows];	// default bases of the dynamic windows
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	static const TUint16 iSpecialBase[ESpecialBases];	// bases for window offsets F9..FF
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	TUint32 iDynamicWindow[EDynamicWindows];			// bases of the dynamic windows
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	TInt iUnicodeWords;									// Unicode words processed; read by compressor, written by expander
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	TInt iMaxUnicodeWords;								// maximum number of Unicode words to read or write
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	TInt iCompressedBytes;								// compressed bytes processed: read by expander, written by compressor
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	TInt iMaxCompressedBytes;							// maximum number of compressed bytes to read or write
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	};
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class MUnicodeSource
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	{
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	public:
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	virtual TUint16 ReadUnicodeValueL() = 0;
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	};
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// A class to read Unicode values directly from memory.
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class TMemoryUnicodeSource: public MUnicodeSource
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	{
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	public:
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	inline TMemoryUnicodeSource(const UTF16* aPtr);
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	inline TUint16 ReadUnicodeValueL();
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	private:
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	const UTF16* iPtr;
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	};
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/**
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A class to hold functions to compress text using the Standard Compression Scheme for Unicode.
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A note on error handling and leaving.
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Although all the public functions except the constructor can leave, it is possible to guarantee success: that is,
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guarantee that a call will not leave, and that compression will be completed. To do this, (i) supply a MUnicodeSource
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object with a non-leaving ReadUnicodeValueL function, such as a TMemoryUnicodeSource; (ii) write output to a
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RWriteStream with a non-leaving WriteL function, or to a buffer that you already know to be big enough, which can be
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found out using CompressedSizeL.
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This guarantee of success is particularly useful when compressing from one memory buffer to another.
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*/
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class TUnicodeCompressor: public TUnicodeCompressionState
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	{
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	public:
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	IMPORT_C TUnicodeCompressor();
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	IMPORT_C void CompressL(TUint8* aOutput,MUnicodeSource& aInput,
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							TInt aMaxOutputBytes = KMaxTInt,TInt aMaxInputWords = KMaxTInt,
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							TInt* aOutputBytes = NULL,TInt* aInputWords = NULL);
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	IMPORT_C TInt FlushL(TUint8* aOutput,TInt aMaxOutputBytes,TInt& aOutputBytes);
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	IMPORT_C static TInt CompressedSizeL(MUnicodeSource& aInput,TInt aInputWords);
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	private:
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	// A structure to store a character and its treatment code
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	struct TAction
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		{
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		// Treatment codes: static and dynamic window numbers, plain ASCII or plain Unicode
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		enum
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			{
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			EPlainUnicode = -2,	// character cannot be expressed as ASCII or using static or dynamic windows
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			EPlainASCII = -1,	// character can be emitted as an ASCII code
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			EFirstDynamic = 0,	// values 0..255 are for dynamic windows with offsets at these places in the offset table
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			ELastDynamic = 255,
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			EFirstStatic = 256,	// values 256..263 are for static windows 0..7
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			ELastStatic = 263
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			};
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		inline TAction();
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		TAction(TUint16 aCode);
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		TUint16 iCode;		// Unicode value of the character
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		TInt iTreatment;	// treatment code: see above
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		};
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	void DoCompressL(RWriteStream* aOutputStream,TUint8* aOutputPointer,MUnicodeSource* aInput,
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					 TInt aMaxCompressedBytes,TInt aMaxUnicodeWords,
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					 TInt* aCompressedBytes,TInt* aUnicodeWords);
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	void FlushInputBufferL();
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	void FlushOutputBufferL();
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	void WriteRunL();
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	void WriteCharacter(const TAction& aAction);
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	void WriteSCharacter(const TAction& aAction);
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	void WriteUCharacter(TUint16 aCode);
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	void WriteByte(TUint aByte);
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	void WriteCharacterFromBuffer();
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	void SelectTreatment(TInt aTreatment);
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	enum
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		{
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		EMaxInputBufferSize = 4,
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		EMaxOutputBufferSize = EMaxInputBufferSize * 3	// no Unicode character can be encoded as more than three bytes
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		};
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	TAction iInputBuffer[EMaxInputBufferSize];			// circular buffer; queue of Unicode characters to be processed
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	TInt iInputBufferStart;								// position of first Unicode character to be processed
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	TInt iInputBufferSize;								// characters in the input buffer
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	TUint8 iOutputBuffer[EMaxOutputBufferSize];			// circular buffer; queue of compressed bytes to be output
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	TInt iOutputBufferStart;							// position of first compressed byte to be output
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	TInt iOutputBufferSize;								// characters in the output buffer
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	TInt iDynamicWindowIndex;							// index of the current dynamic window
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	RWriteStream* iOutputStream;						// if non-null, output is to this stream
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	TUint8* iOutputPointer;								// if non-null, output is to memory
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	MUnicodeSource* iInput;								// input object
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	};
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// inline functions start here
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inline TMemoryUnicodeSource::TMemoryUnicodeSource(const UTF16* aPtr):
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	iPtr(aPtr)
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	{
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	}
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inline TUint16 TMemoryUnicodeSource::ReadUnicodeValueL()
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	{
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	return *iPtr++;
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	}
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inline TUnicodeCompressor::TAction::TAction():
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	iCode(0),
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	iTreatment(EPlainUnicode)
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	{
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	}
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