diff -r 6a20128ce557 -r ebfee66fde93 mmsengine/mmscodec/inc/mmscodecdatasupplier.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmsengine/mmscodec/inc/mmscodecdatasupplier.h	Fri Jun 04 10:25:39 2010 +0100
@@ -0,0 +1,83 @@
+/*
+* Copyright (c) 2005-2007 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:   Data supplier API for chunked sending of large messages
+*
+*/
+
+
+
+#ifndef MMMSCODECDATASUPPLIER_H
+#define MMMSCODECDATASUPPLIER_H
+
+#include <e32base.h>
+
+/**
+ *  Defines the interface for chunked data supply.
+ *
+ *  When MMS messages are sent in chunks this provides the interface
+ *  that can be called to get next encoded data chunk
+ *
+ *  @since v3.1
+ */
+class MMmsCodecDataSupplier
+    {
+
+public:
+
+    /**
+     * Give poiner to next encoded data chunk.
+     *
+     * @since v3.1
+     * @param aDataPart pointer to the next encoded data part
+     * @param aLastDataChunk 
+     *     ETrue if this is the last data chunk
+     *     EFalse if this is not the last data chunk
+     * @return error code, KErrNone if all is well.
+     *     If returns some other error, transaction must be cancelled.
+     */
+    virtual TInt GetNextDataPart(
+        TPtrC8& aDataPart, TBool& aLastDataChunk ) = 0;
+    
+    /**
+     * Empty buffer and prepare next data part (synchronous encoding).
+     * When needed, caller will tell HTTP stack that the next data part is
+     * ready by calling RHTTPTransaction::NotifyNewRequestBodyPartL()
+     *
+     * @since v3.1
+     * @return error code, KErrNone if all is well.
+     *     If returns some other error, transaction must be cancelled.
+     */
+    virtual TInt ReleaseData() = 0;
+    
+    /**
+     * Return the overall data size.
+     *
+     * @since v3.1
+     * @return The overall data size if it is known, otherwise KErrNotFound
+     */
+    virtual TInt OverallDataSize() = 0;
+    
+    /**
+     * Reset the data supplier.
+     * Data supplier must start the data generation from the beginning again.
+     *
+     * @since v3.1
+     * @return KErrNone if reset is successful, other error code if data
+     *     supplier cannot be reset
+     */
+    virtual TInt ResetSupplier() = 0;
+
+    };
+
+#endif // MMMSCODECDATASUPPLIER_H