author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 25 May 2010 14:39:28 +0300 | |
branch | RCL_3 |
changeset 28 | 26914f8d1faf |
parent 0 | 1fb32624e06b |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2000-2009 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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*/ |
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|
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|
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#include <e32std.h> |
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#include <convgeneratedcpp.h> |
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#include "gb2312.h" |
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|
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struct SCnvConversionData; |
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EXPORT_C const TDesC8& CnvGb2312::ReplacementForUnconvertibleUnicodeCharacters() |
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{ |
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return ReplacementForUnconvertibleUnicodeCharacters_internal(); |
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} |
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|
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EXPORT_C const SCnvConversionData& CnvGb2312::ConversionData() |
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{ |
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return conversionData; |
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} |
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|
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EXPORT_C TBool CnvGb2312::IsCharGBBased(TInt& aConfidenceLevel, const TDesC8& aSample) |
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{ |
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TInt sampleLength = aSample.Length(); |
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aConfidenceLevel = 0; |
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//WBB the following is for distiguish between big5 and GBK |
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TInt totalWeight=0; //sum of the weights of 20 most frequent chars |
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TInt sumOfGoodChar=0; //the number of chars whose first byte and second are both in the range |
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TInt sumOfWeight=0; //sum of the weights of the chars which are included in the sample |
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TInt sumOutChar=0; //the number of chars which are not common |
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TInt sumOfBadSecondByte=0;//the number of chars whose first byte is in the range but not the second |
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TInt sumOfBadSingleByte=0; //the number of bad single byte, which is not in valid range |
0
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struct referenceChar |
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{ |
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TUint charGBK; |
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TInt weight; |
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}; |
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|
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referenceChar refGbk[20]; |
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static const TInt iniWeight[20]= |
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{ |
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//occurence per 1000 chars |
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30,20,20,10,10,10,10,10,5,5, |
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5,5,5,5,5,5,5,5,5,5 |
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}; |
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static const TUint iniChar[20]= |
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{ |
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0xa3ac,0xb5c4,0xc1cb,0xb8f6,0xb2bb,0xb0d1,0xd2bb,0xcac7,0xd2aa,0xbecd, |
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0xd2b2,0xccec,0xc9cf,0xbacd,0xd6d0,0xd4da,0xd0a1,0xc8cb,0xcfc2,0xd6d0, |
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}; |
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|
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for (TInt k=0; k<20; k++) |
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{ |
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refGbk[k].charGBK=iniChar[k]; |
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refGbk[k].weight=iniWeight[k]; |
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totalWeight=totalWeight+iniWeight[k]; |
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} |
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|
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|
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//WBB |
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for (TInt i = 0; i < sampleLength; ++i) |
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{ |
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//GBK encoding first byte range 0x81-0xfe |
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// second byte range 0x40-0x7e, 0x80-0xfe |
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if((aSample[i] >= 0x81) && (aSample[i] <= 0xfe)) |
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{ |
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TInt increment1 = i+1; |
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if (increment1 >= sampleLength) |
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break; |
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if (((aSample[increment1] >=0x40) && (aSample[increment1] <= 0x7e)) || |
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((aSample[increment1] >=0x80) && (aSample[increment1] <= 0xfe))) |
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{ |
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//WBB |
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TUint charGbk=(aSample[i]<<8)|(aSample[increment1]); |
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TInt j; |
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for (j=0; j<20; j++) |
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{ |
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if (charGbk==refGbk[j].charGBK) |
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{ |
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sumOfWeight=sumOfWeight+refGbk[j].weight; |
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break; |
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} |
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} |
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if ((aSample[i]>=0xa4)&&(aSample[i]<=0xaf)) |
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sumOutChar++; |
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sumOfGoodChar++; |
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i++; |
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102 |
//WBB |
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} |
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else |
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105 |
{ |
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sumOfBadSecondByte++; |
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} |
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} |
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// if seldom used characters |
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else if (aSample[i] < 0x20 || aSample[i] > 0x7F ) |
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111 |
{ |
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if (aSample[i]!=0x09 && aSample[i]!=0x0A && aSample[i]!=0x0D) |
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sumOfBadSingleByte++; |
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} |
0
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} // for |
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116 |
|
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TInt limit; |
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limit = (10*sampleLength)/100; |
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if (sumOfGoodChar > limit) |
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{ |
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aConfidenceLevel=sumOfGoodChar*100/(sumOfBadSecondByte+sumOfGoodChar+sumOfBadSingleByte); |
0
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aConfidenceLevel=aConfidenceLevel-Max(0,((totalWeight-sumOfWeight)*sumOfGoodChar/1000));//against frequent chars |
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aConfidenceLevel=aConfidenceLevel-(sumOutChar*100/sumOfGoodChar);//against gap |
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aConfidenceLevel=(aConfidenceLevel < 0)?0:aConfidenceLevel; |
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} |
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else |
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aConfidenceLevel=0; |
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return ETrue; |
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} |