1 /*

     2 * Copyright (c) 2005 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:  CPosReadBufStorage class implementation

    15 *

    16 */

    17 

    18 

    19 #include "epos_cposreadbufstorage.h"

    20 

    21 // ======== MEMBER FUNCTIONS ========

    22 

    23 // ---------------------------------------------------------------------------

    24 // C++ constructor

    25 // ---------------------------------------------------------------------------

    26 //

    27 CPosReadBufStorage::CPosReadBufStorage( const TDesC8& aBuffer ) 

    28     : iBuffer( aBuffer ) 

    29     {

    30     iPointer = iBuffer.Ptr();

    31     iBoundary = iPointer + iBuffer.Size();

    32     }

    33 

    34 // ---------------------------------------------------------------------------

    35 // Static constructor

    36 // ---------------------------------------------------------------------------

    37 //

    38 CPosReadBufStorage* CPosReadBufStorage::NewLC( const TDesC8& aBuffer ) 

    39     {

    40     CPosReadBufStorage* self = new ( ELeave ) CPosReadBufStorage( aBuffer );

    41     CleanupStack::PushL( self );

    42     return self;

    43     }

    44 

    45 // ---------------------------------------------------------------------------

    46 // Copies aSize bytes from internal buffer to aTrg address

    47 // Leaves if buffer is shorter than requested amount of data.

    48 // ---------------------------------------------------------------------------

    49 //

    50 void CPosReadBufStorage::GetL( TUint8* aTrg, TUint aSize ) 

    51     {

    52     if ( iPointer + aSize <= iBoundary ) 

    53         {

    54         memcpy( aTrg, iPointer, aSize );

    55         iPointer += aSize;

    56         }

    57     else

    58         {

    59         User::Leave( KErrCorrupt );

    60         }

    61     }

    62 

    63 // ---------------------------------------------------------------------------

    64 // Copies TInt from internal buffer

    65 // ---------------------------------------------------------------------------

    66 //

    67 void CPosReadBufStorage::GetL( TInt& aData ) 

    68     {

    69     GetL( (TUint8*) &aData, sizeof( TInt ) );

    70     }

    71 

    72 // ---------------------------------------------------------------------------

    73 // Copies TUint32 from internal buffer

    74 // ---------------------------------------------------------------------------

    75 //

    76 void CPosReadBufStorage::GetL( TUint32& aData ) 

    77   {

    78   GetL( (TUint8*) &aData, sizeof( TUint32 ) );

    79   }

    80 

    81 // ---------------------------------------------------------------------------

    82 // Copies TUint16 from internal buffer

    83 // ---------------------------------------------------------------------------

    84 //

    85 void CPosReadBufStorage::GetL( TUint16& aData ) 

    86   {

    87   GetL( (TUint8*) &aData, sizeof( TUint16 ) );

    88   }

    89 

    90 // ---------------------------------------------------------------------------

    91 // Copies descriptor from internal buffer to aData buffer.

    92 // Size of the data to be copied is read from the buffer.

    93 // Leaves if target descriptor cannot accept descriptor in buffer.

    94 // ---------------------------------------------------------------------------

    95 //

    96 void CPosReadBufStorage::GetL( TDes8& aData ) 

    97   {

    98   TInt size;

    99   GetL( size );

   100   if ( size >= 0 && 

   101      aData.MaxSize() >= size &&

   102      iPointer + size <= iBoundary ) 

   103     {

   104     aData = TPtrC8( (TUint8*) iPointer, size );

   105     iPointer += size;

   106     }

   107   else

   108     {

   109     User::Leave( KErrCorrupt );

   110     }

   111   }

   112 

   113 // ---------------------------------------------------------------------------

   114 // Sets passed descriptor to data from internal buffer.

   115 // Size and length of the data are read from the buffer.

   116 // ---------------------------------------------------------------------------

   117 //

   118 void CPosReadBufStorage::GetL( TPtrC& aData ) 

   119   {

   120   TInt size, length;

   121   GetL( length );

   122   GetL( size );

   123   if ( size >= 0 && length >= 0 && size >= length && iPointer + size <= iBoundary ) 

   124     {

   125     aData.Set( (TUint16*) iPointer, length );

   126     iPointer += size;  

   127     }

   128   else

   129     {

   130     User::Leave( KErrCorrupt );

   131     }

   132   }