author | Jon Chatten |
Wed, 24 Feb 2010 09:18:04 +0000 | |
branch | fix |
changeset 264 | a888df7554c4 |
parent 0 | 044383f39525 |
permissions | -rw-r--r-- |
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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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134 |
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135 |
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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141 |
{ |
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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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149 |
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inline TAction(); |
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TAction(TUint16 aCode); |
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152 |
|
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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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156 |
|
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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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169 |
|
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170 |
enum |
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171 |
{ |
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172 |
EMaxInputBufferSize = 4, |
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EMaxOutputBufferSize = EMaxInputBufferSize * 3 // no Unicode character can be encoded as more than three bytes |
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174 |
}; |
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175 |
TAction iInputBuffer[EMaxInputBufferSize]; // circular buffer; queue of Unicode characters to be processed |
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176 |
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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178 |
TUint8 iOutputBuffer[EMaxOutputBufferSize]; // circular buffer; queue of compressed bytes to be output |
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179 |
TInt iOutputBufferStart; // position of first compressed byte to be output |
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180 |
TInt iOutputBufferSize; // characters in the output buffer |
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181 |
TInt iDynamicWindowIndex; // index of the current dynamic window |
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182 |
RWriteStream* iOutputStream; // if non-null, output is to this stream |
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183 |
TUint8* iOutputPointer; // if non-null, output is to memory |
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184 |
MUnicodeSource* iInput; // input object |
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185 |
}; |
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186 |
|
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187 |
// inline functions start here |
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188 |
inline TMemoryUnicodeSource::TMemoryUnicodeSource(const UTF16* aPtr): |
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189 |
iPtr(aPtr) |
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190 |
{ |
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191 |
} |
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192 |
|
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193 |
inline TUint16 TMemoryUnicodeSource::ReadUnicodeValueL() |
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194 |
{ |
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195 |
return *iPtr++; |
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196 |
} |
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197 |
|
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198 |
inline TUnicodeCompressor::TAction::TAction(): |
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199 |
iCode(0), |
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200 |
iTreatment(EPlainUnicode) |
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201 |
{ |
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202 |
} |
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203 |