secureswitools/swianalysistoolkit/source/common/ucmp.h
author Simon Howkins <simonh@symbian.org>
Mon, 22 Nov 2010 12:04:39 +0000
branchRCL_3
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permissions -rw-r--r--
Adjusted to avoid exports, etc, from a top-level bld.inf
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/*
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* Copyright (c) 2006-2009 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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* Ported from ucmp.h
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* Header for the Standard Compression Scheme for Unicode.
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* This code is compiled only in the Unicode build.
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*
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*/
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/**
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 @file 
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 @internalComponent 
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*/
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#ifndef __UCMP_H__
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#define __UCMP_H__ 1
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#include "symbiantypes.h"
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#include <iostream>
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typedef std::istream Deserialiser;
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typedef std::ostream Serialiser;
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#define KMaxTInt 0x7FFFFFFF
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/**
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  * @internalComponent
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  */
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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 TInt32 StaticWindowIndex(TUint16 aCode);
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	static TInt32 DynamicWindowOffsetIndex(TUint16 aCode);
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	static TUint32 DynamicWindowBase(TInt32 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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		};
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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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	TInt32 iUnicodeWords;									// Unicode words processed; read by compressor, written by expander
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	TInt32 iMaxUnicodeWords;								// maximum number of Unicode words to read or write
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	TInt32 iCompressedBytes;								// compressed bytes processed: read by expander, written by compressor
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	TInt32 iMaxCompressedBytes;							// maximum number of compressed bytes to read or write
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	};
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/**
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  * @internalComponent
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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 ReadUnicodeValue() = 0;
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	};
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/**
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  * @internalComponent
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 A class to read Unicode values directly from memory.
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 */
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class TMemoryUnicodeSource: public MUnicodeSource
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	{
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	public:
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	inline TMemoryUnicodeSource(const TUint16* aPtr);
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	inline TUint16 ReadUnicodeValue();
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	private:
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	const TUint16* iPtr;
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	};
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/**Deserialiser& Deserialiser::
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  * @internalComponent
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 A class to read Unicode values from a stream built on a memory object.
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 */
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class TMemoryStreamUnicodeSource: public MUnicodeSource
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	{
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	public:
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	inline TMemoryStreamUnicodeSource(Deserialiser& aStream);
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	inline TUint16 ReadUnicodeValue();
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	private:
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	Deserialiser& iStream;
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	};
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/**
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  * @internalComponent
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 */
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class MUnicodeSink
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	{
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	public:
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	virtual void WriteUnicodeValue(TUint16 aValue) = 0;
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	};
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/**
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  * @internalComponent
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 A class to write Unicode values directly to memory.
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 */
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class TMemoryUnicodeSink: public MUnicodeSink
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	{
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	public:
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	inline TMemoryUnicodeSink(TUint16* aPtr);
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	inline void WriteUnicodeValue(TUint16 aValue);
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	private:
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	TUint16* iPtr;
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	};
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/**
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  * @internalComponent
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 A class to write Unicode values to a stream built on a memory object.
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 */
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class TMemoryStreamUnicodeSink: public MUnicodeSink
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	{
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	public:
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	inline TMemoryStreamUnicodeSink(Serialiser& aStream);
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	inline void WriteUnicodeValue(TUint16 aValue);
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	private:
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	Serialiser& iStream;
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	};
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/**
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  * @internalComponent
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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 ReadUnicodeValue function, such as a TMemoryUnicodeSource; (ii) write output to a
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Serialiser with a non-leaving Write function, or to a buffer that you already know to be big enough, which can be
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found out using CompressedSize.
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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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	TUnicodeCompressor();
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	void Compress(Serialiser& aOutput,MUnicodeSource& aInput,
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							TInt32 aMaxOutputBytes = KMaxTInt,TInt32 aMaxInputWords = KMaxTInt,
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							TInt32* aOutputBytes = 0,TInt32* aInputWords = 0);
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	void Compress(TUint8* aOutput,MUnicodeSource& aInput,
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							TInt32 aMaxOutputBytes = KMaxTInt,TInt32 aMaxInputWords = KMaxTInt,
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							TInt32* aOutputBytes = 0,TInt32* aInputWords = 0);
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	TInt32 Flush(Serialiser& aOutput,TInt32 aMaxOutputBytes,TInt32& aOutputBytes);
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	TInt32 Flush(TUint8* aOutput,TInt32 aMaxOutputBytes,TInt32& aOutputBytes);
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	static TInt32 CompressedSize(MUnicodeSource& aInput,TInt32 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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		TInt32 iTreatment;	// treatment code: see above
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		};
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	void DoCompress(Serialiser* aOutputStream,TUint8* aOutputPointer,MUnicodeSource* aInput,
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					 TInt32 aMaxCompressedBytes,TInt32 aMaxUnicodeWords,
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					 TInt32* aCompressedBytes,TInt32* aUnicodeWords);
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	void FlushInputBuffer();
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	void FlushOutputBuffer();
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	void WriteRun();
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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(TUint32 aByte);
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	void WriteCharacterFromBuffer();
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	void SelectTreatment(TInt32 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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	TInt32 iInputBufferStart;								// position of first Unicode character to be processed
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	TInt32 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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	TInt32 iOutputBufferStart;							// position of first compressed byte to be output
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	TInt32 iOutputBufferSize;								// characters in the output buffer
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	TInt32 iDynamicWindowIndex;							// index of the current dynamic window
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	Serialiser* 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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/**
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  * @internalComponent
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A class to hold functions to expand 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 puTUnicodeExpanderblic 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 expansion will be completed. To do this, (i) supply a MUnicodeSink
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object with a non-leaving WriteUnicodeValue function, such as a TMemoryUnicodeSink; (ii) read input from a Deserialiser
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with a non-leaving Read function; (iii) supply a big enough buffer to write the ouput; you can find out how big by
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calling ExpandedSize, using methods (i) and (ii) to guarantee success.
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This guarantee of success is particularly useful when expanding from one memory buffer to another.
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*/
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class TUnicodeExpander: public TUnicodeCompressionState
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	{
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	public:
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	TUnicodeExpander();
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	void Expand(MUnicodeSink& aOutput,Deserialiser& aInput,
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						  TInt32 aMaxOutputWords = KMaxTInt,TInt32 aMaxInputBytes = KMaxTInt,
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						  TInt32* aOutputWords = 0,TInt32* aInputBytes = 0);
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	void Expand(MUnicodeSink& aOutput,const TUint8* aInput,
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						  TInt32 aMaxOutputWords = KMaxTInt,TInt32 aMaxInputBytes = KMaxTInt,
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						  TInt32* aOutputWords = 0,TInt32* aInputBytes = 0);
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	TInt32 Flush(MUnicodeSink& aOutput,TInt32 aMaxOutputWords,TInt32& aOutputWords);
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	static TInt32 ExpandedSize(Deserialiser& aInput,TInt32 aInputBytes);
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	static TInt32 ExpandedSize(const TUint8* aInput,TInt32 aInputBytes);
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	private:
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	void DoExpand(MUnicodeSink* aOutput,Deserialiser* aInputStream,const TUint8* aInputPointer,
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				   TInt32 aMaxOutputWords,TInt32 aMaxInputBytes,
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				   TInt32* aOutputWords,TInt32* aInputBytes);
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	void HandleByte();
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	void FlushOutputBuffer();
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	TBool HandleSByte(TUint8 aByte);
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	TBool HandleUByte(TUint8 aByte);
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	TBool ReadByte(TUint8& aByte);
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	TBool QuoteUnicode();
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	TBool DefineWindow(TInt32 aIndex);
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	TBool DefineExpansionWindow();
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	void WriteChar(TUint16 aChar);
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	void WriteChar32(TUint32 aChar);
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	enum
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		{
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		EMaxInputBufferSize = 3,		 				// no Unicode character can be encoded as more than 3 bytes
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		EMaxOutputBufferSize = 2						// no byte can be expanded into more than 2 Unicode characters
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		};
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	TUint8 iInputBuffer[EMaxInputBufferSize];			// buffer containing a group of compressed bytes representing
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														// a single operation; when an input source ends in the
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														// middle of an operation, this buffer enables the next
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														// expansion to start in the correct state
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	TInt32 iInputBufferStart;								// next read position in the input buffer
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	TInt32 iInputBufferSize;								// bytes in the input buffer
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	TUint16 iOutputBuffer[EMaxOutputBufferSize];		// circular buffer; queue of Unicode characters to be output
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	TInt32 iOutputBufferStart;							// position of first Unicode character to be output
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	TInt32 iOutputBufferSize;								// characters in the output buffer
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	MUnicodeSink* iOutput;								// output object
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	Deserialiser* iInputStream;							// if non-null, input is from this stream
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	const TUint8* iInputPointer;						// if non-null, input is from memory
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	};
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// inline functions start here
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inline TMemoryUnicodeSource::TMemoryUnicodeSource(const TUint16* aPtr):
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	iPtr(aPtr)
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	{
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	}
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inline TUint16 TMemoryUnicodeSource::ReadUnicodeValue()
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	{
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	return *iPtr++;
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	}
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inline TMemoryStreamUnicodeSource::TMemoryStreamUnicodeSource(Deserialiser& aStream):
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	iStream(aStream)
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	{
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	}
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inline TMemoryUnicodeSink::TMemoryUnicodeSink(TUint16* aPtr):
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	iPtr(aPtr)
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	{
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	}
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inline void TMemoryUnicodeSink::WriteUnicodeValue(TUint16 aValue)
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	{
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	*iPtr++ = aValue;
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	}
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inline TMemoryStreamUnicodeSink::TMemoryStreamUnicodeSink(Serialiser& aStream):
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	iStream(aStream)
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	{
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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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#endif // __UCMP_H__
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