1 /*

     2 * Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  Parses Skype id from UUI message.

    15 *

    16 */

    17 

    18 

    19 #include "tcspskypeidparser.h"

    20 

    21 const TInt KMinSkypeIdUUILength = 3;

    22 const TInt KMaxSkypeIdUUILength = 33;

    23 const TInt KMaxSkypeIdLength = 32;

    24 const TInt KStartOf31To32EncodingByte = 26;

    25 const TInt KUUIMTDicriminator = 0x44;

    26 

    27 // ======== MEMBER FUNCTIONS ========

    28 

    29 // ---------------------------------------------------------------------------

    30 // Constructor

    31 // ---------------------------------------------------------------------------

    32 //

    33 TCSPSkypeIdParser::TCSPSkypeIdParser() 

    34     {

    35     }

    36 

    37 // ---------------------------------------------------------------------------

    38 // Creates buffer to be used by client with parse method.

    39 // ---------------------------------------------------------------------------

    40 //  

    41 HBufC* TCSPSkypeIdParser::CreateSkypeIdBufferL()

    42     {

    43     return HBufC::NewL( KMaxSkypeIdLength );

    44     }

    45     

    46 // ---------------------------------------------------------------------------

    47 // Parses skype id.

    48 // SkypeID format:

    49 // byte 0: Protocol discriminator: Always 0x00

    50 // byte 1: User-User Information Discriminator.

    51 //         For MT call this has to be 0x44

    52 // Byte 2: First skype id character a.k.a payload. MSB bit is zero.

    53 // Byte 26-33 May have MSB bit set, which are bits of the last character.

    54 // The 26 byte's MSB is the last characters MSB bit.

    55 // ---------------------------------------------------------------------------

    56 //

    57 TInt TCSPSkypeIdParser::Parse( 

    58     const TDesC& aUUIMessage, 

    59     TDes& aSkypeId )

    60     {

    61     const TInt messageLength( aUUIMessage.Length() );

    62     TInt error = KErrNone;

    63     

    64     const TBool messageSizeOk = (messageLength >= KMinSkypeIdUUILength &&

    65     							 messageLength <= KMaxSkypeIdUUILength);

    66     							 

    67     if( messageSizeOk &&

    68        ( aUUIMessage[1] ) == KUUIMTDicriminator ) // address type

    69         {

    70         

    71         TUint lastChar = 0;

    72         

    73         // skypeId payload starts from the second byte.

    74         TInt i = 2;

    75         for( ; i < messageLength; i++ )

    76             {

    77             TUint byte = aUUIMessage[i];

    78             if( i >= KStartOf31To32EncodingByte )

    79                 {

    80                 // 31 to 32 encoding: last character is build from

    81                 // 7 last bytes.

    82                 lastChar = lastChar << 1;

    83                 lastChar |= (byte>>7)&0x01;

    84                 }

    85             // MSB bit is not part of the character.

    86             aSkypeId.Append( byte & 0x7F ); 

    87                 

    88             

    89             }

    90             

    91         // Append the last char only if the aUUIMessage size was the maximum and there

    92         // is content in the last char.

    93         if( messageLength == KMaxSkypeIdUUILength && lastChar != 0 )

    94             {

    95             aSkypeId.Append(lastChar);

    96             }

    97 

    98         }

    99     else

   100         {

   101         error = KErrNotSupported;

   102         }

   103         

   104     return error;

   105     }