author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 08:45:53 +0200 | |
changeset 0 | d11fb78c4374 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2004-2007 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: Contains the CRsImageParser class definition. |
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* |
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*/ |
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|
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|
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// RsImageParser.cpp: implementation of the CRsImageParser class. |
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// |
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////////////////////////////////////////////////////////////////////// |
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|
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#include "crsimageparser.h" |
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#include "clog.h" |
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////////////////////////////////////////////////////////////////////// |
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// Construction/Destruction |
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////////////////////////////////////////////////////////////////////// |
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CRsImageParser* CRsImageParser::NewLC() |
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{ |
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CRsImageParser* self = new (ELeave) CRsImageParser(); |
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CleanupStack::PushL(self); |
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self->ConstructL(); |
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return self; |
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} |
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void CRsImageParser::ConstructL() |
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{ |
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User::LeaveIfError(iFs.Connect()); |
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} |
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CRsImageParser::~CRsImageParser() |
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{ |
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iFs.Close(); |
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} |
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CRsImageParser::CRsImageParser() |
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{ |
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} |
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void CRsImageParser::ValidateL( const TDesC& aFileName, TBool& aValid, TInt& aErr ) |
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{ |
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LOG1("CRsImageParser::ValidateL aFileName: %S", &aFileName); |
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aValid = EFalse; |
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TInt dataPos( 0 ); |
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TBuf8<9> imgData; |
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TBool bAllDone( EFalse ); |
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TInt height( 0 ); |
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TInt width( 0 ); |
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TInt startOfDataOffset( 0 ); |
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TInt encoding( EUnknown ); |
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TInt size( 0 ); |
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RFile file; |
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aErr = file.Open( iFs, aFileName, EFileRead | EFileShareReadersOnly ); |
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LOG1("CRsImageParser::ValidateL file.Open (shareread mode): %d", aErr); |
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if ( aErr != KErrNone ) |
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{ |
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aErr = file.Open( iFs, aFileName, EFileRead | EFileShareAny ); |
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LOG1("CRsImageParser::ValidateL file.Open (shareany mode): %d", aErr); |
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} |
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// magic numbers used here are JPEG format related |
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else // if ( aErr == KErrNone ) // 1 IF |
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{ |
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CleanupClosePushL( file ); |
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aErr = file.Size( size ); |
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if( size && aErr == KErrNone ) // 2 IF |
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{ |
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aErr = ReadData( file, dataPos, imgData ); |
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if( aErr == KErrNone && imgData.Length() == 9 ) // 3 IF |
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{ |
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// First check for the JPEG header "FF D8" |
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if( imgData[0] == 0xff && imgData[1] == 0xd8 ) // 4 IF |
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{ |
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// Start skipping headers until we find the one we're looking for |
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dataPos = (imgData[4] << 8) + imgData[5] + 4; |
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aErr = ReadData( file, dataPos, imgData ); |
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while( aErr == KErrNone && imgData.Length() == 9 && imgData[0] == 0xff ) |
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{ |
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switch( imgData[1] ) |
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{ |
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case 0xda: |
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// Start of data |
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startOfDataOffset = dataPos + ((imgData[2] << 8) + imgData[3] + 2); |
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bAllDone = ETrue; |
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break; |
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|
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case EDiffArithLossless: |
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encoding = imgData[1]; |
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height = (imgData[5] << 8) + imgData[6]; |
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width = (imgData[7] << 8) + imgData[8]; |
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break; |
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109 |
|
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110 |
default: |
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break; |
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} // SWITCH |
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113 |
|
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if( bAllDone ) |
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{ |
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break; |
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} |
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else |
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119 |
{ |
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dataPos += (imgData[2] << 8) + imgData[3] + 2; |
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aErr = ReadData( file, dataPos, imgData ); |
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} |
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} // WHILE |
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} // 4 IF |
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else |
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126 |
{ |
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// Not a JPG |
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aErr = KErrCorrupt; |
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} |
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} // 3 IF |
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} // 2 IF |
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132 |
|
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CleanupStack::PopAndDestroy( &file ); |
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} // 1 IF |
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135 |
|
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aValid = Validate( startOfDataOffset, width, height, size, encoding, aErr ); |
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137 |
|
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LOG1("CRsImageParser::ValidateL aValid: %d", aValid); |
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LOG1("CRsImageParser::ValidateL aErr: %d", aErr); |
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LOG("CRsImageParser::ValidateL end"); |
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} |
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142 |
|
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TBool CRsImageParser::Validate( TInt aStartOfDataOffset, TInt aWidth, TInt aHeight, TInt aSize, TInt aEncoding, TInt aErr ) |
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144 |
{ |
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if ( aStartOfDataOffset && aWidth && aHeight && aSize && aEncoding && !aErr ) |
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146 |
{ |
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return ETrue; |
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} |
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149 |
else |
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150 |
{ |
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return EFalse; |
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152 |
} |
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153 |
} |
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154 |
|
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TInt CRsImageParser::ReadData( RFile& aFile, TInt aStartByte, TDes8& aData ) |
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156 |
{ |
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LOG("CRsImageParser::ReadData begin"); |
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TInt err = aFile.Read( aStartByte, aData ); |
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LOG1("CRsImageParser::ReadData return: %d", err); |
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return err; |
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161 |
} |
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162 |
|
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163 |
// End of File |