--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/imagingmodules/exiflib/src/ExifCommon.cpp	Thu Dec 17 09:22:31 2009 +0200
@@ -0,0 +1,243 @@
+/*
+* Copyright (c) 2003, 2004 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  An internal service class including some utility functions.
+*
+*/
+
+
+// INCLUDE FILES
+#include "ExifCommon.h"
+
+// ============================ MEMBER FUNCTIONS ===============================
+
+// -----------------------------------------------------------------------------
+// TExifCommon::SetUint32
+// Puts the given 32-bit unsigned integer to the 4-byte location, whose start 
+// point is specified with the given 8-bit unsigned integer pointer. 
+// -----------------------------------------------------------------------------
+//
+TInt TExifCommon::SetUint32( TUint8* aPtr, TUint32 aUint32 )
+    {
+    if ( !aPtr )
+        {
+        return KErrGeneral;
+        }
+    *( aPtr + 3 ) = STATIC_CAST( TUint8, ( aUint32 >> 24 ) & KOneByteMask );
+    *( aPtr + 2 ) = STATIC_CAST( TUint8, ( aUint32 >> 16 ) & KOneByteMask );
+    *( aPtr + 1 ) = STATIC_CAST( TUint8, ( aUint32 >> 8 ) & KOneByteMask );
+    *aPtr = STATIC_CAST( TUint8, aUint32 & KOneByteMask );
+    return KErrNone;
+    }
+
+// -----------------------------------------------------------------------------
+// TExifCommon::SetUint16
+// Puts the given 16-bit unsigned integer to the 2-byte location, whose start 
+// point is specified with the given 8-bit unsigned integer pointer. 
+// -----------------------------------------------------------------------------
+//
+TInt TExifCommon::SetUint16( TUint8* aPtr, TUint16 aUint16 )
+    {
+    if ( !aPtr )
+        {
+        return KErrGeneral;
+        }
+    *( aPtr + 1 ) = STATIC_CAST( TUint8, ( aUint16 >> 8 ) & KOneByteMask );
+    *aPtr = STATIC_CAST( TUint8, aUint16 & KOneByteMask );
+    return KErrNone;
+    }
+
+// -----------------------------------------------------------------------------
+// TExifCommon::Uint32
+// Returns a 32-bit unsigned integer from the location, whose start point is 
+// specified with the given 8-bit unsigned integer pointer. 
+// -----------------------------------------------------------------------------
+//
+TUint32 TExifCommon::Uint32L( TUint8* aPtr )
+    {
+    if ( !aPtr )
+        {
+        User::Leave( KErrGeneral );
+        }
+    TUint32 ret = 0;
+    ret = *( aPtr + 3 );
+    ret = ( ret << 8 ) + *( aPtr + 2 );
+    ret = ( ret << 8 ) + *( aPtr + 1 );
+    ret = ( ret << 8 ) + *aPtr;
+    return ret;
+    }
+
+// -----------------------------------------------------------------------------
+// TExifCommon::Int32
+// Returns a 32-bit integer from the location, whose start point is specified  
+// with the given 8-bit integer pointer. 
+// -----------------------------------------------------------------------------
+//
+TInt32 TExifCommon::Int32L( TUint8* aPtr )
+    {
+    if ( !aPtr )
+        {
+        User::Leave( KErrGeneral );
+        }
+    TUint32 ret = 0;
+    ret = *( aPtr + 3 );
+    ret = ( ret << 8 ) + *( aPtr + 2 );
+    ret = ( ret << 8 ) + *( aPtr + 1 );
+    ret = ( ret << 8 ) + *aPtr;
+    return STATIC_CAST( TInt32, ret );
+    }
+
+// -----------------------------------------------------------------------------
+// TExifCommon::Uint16
+// Returns a 16-bit unsigned integer from the location, whose start point is 
+// specified with the given 8-bit unsigned integer pointer. 
+// -----------------------------------------------------------------------------
+//
+TUint16 TExifCommon::Uint16L( TUint8* aPtr )
+    {
+    if ( !aPtr )
+        {
+        User::Leave( KErrGeneral );
+        }
+    TUint16 ret = 0;
+    ret = *( aPtr + 1 );
+    ret = STATIC_CAST( TUint16, ( ret << 8 ) + *aPtr );
+    return ret;
+    }
+
+// -----------------------------------------------------------------------------
+// TExifCommon::IsValidTagId
+// Checks if the given 16-bit unsigned integer is one of the defined tag IDs.
+// -----------------------------------------------------------------------------
+//
+TBool TExifCommon::IsValidTagId( TUint16 aTagId )
+    {
+    TInt i = 0;
+    for ( i = 0; i < KNoIfd0Tags; ++i )
+        {
+        if ( aTagId == ifd0Tags[i].iId )
+            {
+            return ETrue;
+            }
+        }
+    for ( i = 0; i < KNoIfdExifTags; ++i )
+        {
+        if ( aTagId == ifdExifTags[i].iId )
+            {
+            return ETrue;
+            }
+        }
+    for ( i = 0; i < KNoIfd1Tags; ++i )
+        {
+        if ( aTagId == ifd1Tags[i].iId )
+            {
+            return ETrue;
+            }
+        }
+    for ( i = 0; i < KNoIfdGpsTags; ++i )
+        {
+        if ( aTagId == ifdGpsTags[i].iId )
+            {
+            return ETrue;
+            }
+        }
+    for ( i = 0; i < KNoIfdIntOpTags; ++i )
+        {
+        if ( aTagId == ifdIntOpTags[i].iId )
+            {
+            return ETrue;
+            }
+        }
+    LOGTEXT2( _L( "ExifLib: TExifCommon::IsValidTagId() returning EFalse: aTagId=0x%x" ), aTagId );
+    return EFalse;
+    }
+
+// -----------------------------------------------------------------------------
+// TExifCommon::LocateJpegMarkerPtr
+// Locates the pointer to the first specified Jpeg Marker from the begining
+// inside the given interval.
+// -----------------------------------------------------------------------------
+//
+TUint8* TExifCommon::LocateJpegMarkerPtr( 
+    TUint16 aMarker, 
+    TUint8* aStartPtr,
+    TUint8* aEndPtr)
+    {
+    if ( ( !aStartPtr ) || ( !aEndPtr ) || ( !aMarker ) )
+        {
+        return NULL;
+        }
+
+    TUint16 revMarker = 
+        STATIC_CAST( TUint16, ( aMarker << 8 ) + ( aMarker >> 8 ) );
+    --aStartPtr;
+    TUint16 atHand = 0;
+    TInt error = KErrNone;
+    do
+        {
+        if ( aStartPtr >= aEndPtr )
+            {
+            return NULL;
+            }
+        if ( *( ++aStartPtr ) == KMarkerStart )
+            {
+            TRAP( error, atHand = TExifCommon::Uint16L( aStartPtr ) );
+            }
+        } 
+    while ( (atHand != revMarker ) && ( error == KErrNone) );
+    if ( error )
+        {
+        return NULL;
+        }
+    return aStartPtr;
+    }
+
+// -----------------------------------------------------------------------------
+// TExifCommon::LocateJpegMarkerPtrFromEnd
+// Locates the pointer to the first specified Jpeg Marker from the end
+// inside the given interval.
+// -----------------------------------------------------------------------------
+//
+TUint8* TExifCommon::LocateJpegMarkerPtrFromEnd( 
+    TUint16 aMarker, 
+    TUint8* aStartPtr,
+    TUint8* aEndPtr)
+    {
+    if ( ( !aStartPtr ) || ( !aEndPtr ) || ( !aMarker ) )
+        {
+        return NULL;
+        }
+
+    TUint16 revMarker = 
+        STATIC_CAST( TUint16, ( aMarker << 8 ) + ( aMarker >> 8 ) );
+    --aEndPtr;
+    TUint16 atHand = 0;
+    TInt error = KErrNone;
+    do
+        {
+        if ( aEndPtr <= aStartPtr )
+            {
+            return NULL;
+            }
+        if ( *( --aEndPtr ) == KMarkerStart )
+            {
+            TRAP( error, atHand = TExifCommon::Uint16L( aEndPtr ) );
+            }
+        } 
+    while ( (atHand != revMarker ) && ( error == KErrNone) );
+    if ( error )
+        {
+        return NULL;
+        }
+    return aEndPtr;
+    }