1 /*

     2 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 *

     5 * Redistribution and use in source and binary forms, with or without

     6 * modification, are permitted provided that the following conditions are met:

     7 *

     8 * - Redistributions of source code must retain the above copyright notice,

     9 *   this list of conditions and the following disclaimer.

    10 * - Redistributions in binary form must reproduce the above copyright notice,

    11 *   this list of conditions and the following disclaimer in the documentation

    12 *   and/or other materials provided with the distribution.

    13 * - Neither the name of Nokia Corporation nor the names of its contributors

    14 *   may be used to endorse or promote products derived from this software

    15 *   without specific prior written permission.

    16 *

    17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    27 * POSSIBILITY OF SUCH DAMAGE.

    28 * 

    29 * Initial Contributors:

    30 * Nokia Corporation - initial contribution.

    31 *

    32 * Contributors:

    33 *

    34 * Description: 

    35 *

    36 */

    37 

    38 using System;

    39 using System.Collections.Generic;

    40 using System.Text;

    41 using SymbianUtils.RawItems;

    42 using HeapLib.Statistics;

    43 

    44 namespace HeapLib.Cells.Descriptors.Implementations.Ascii

    45 {

    46     internal class DesAsciiAlgorithmBase : DescriptorAlgorithmBase

    47     {

    48         #region Constructors & destructor

    49         public DesAsciiAlgorithmBase( HeapStatistics aStats )

    50             : base( aStats )

    51         {

    52         }

    53         #endregion

    54 

    55         #region Internal constants

    56         protected const int KDescriptorRawItemOffsetEBufC = KDescriptorRawItemOffsetAfterLengthAndType + 1; // Allows for [Type+Length] + MaxLength

    57         #endregion

    58 

    59         #region Internal methods

    60         protected string ConvertToText( int aLengthInUnicodeChars )

    61         {

    62             return ConvertToText( aLengthInUnicodeChars, KDescriptorRawItemOffsetAfterLengthAndType );

    63         }

    64 

    65         protected string ConvertToText( int aLengthInAsciiChars, int aStartRawItemIndex )

    66         {

    67             StringBuilder text = new StringBuilder();

    68             for ( int i = aStartRawItemIndex; i < RawItems.Count && i < Math.Min( aLengthInAsciiChars, DescriptorAlgorithmBase.KDescriptorTextMaxLength ); i++ )

    69             {

    70                 RawItem item = RawItems[ i ];

    71                 //

    72                 text.Append( item.OriginalCharacterisedData );

    73             }

    74             //

    75             string ret = text.ToString();

    76             if ( ret.Length > aLengthInAsciiChars )

    77             {

    78                 ret = ret.Substring( 0, aLengthInAsciiChars );

    79             }

    80             return ret;

    81         }

    82 

    83         protected int PrintableCharacterCount( int aMaxNumberOfAsciiBytesToProcess, out bool aAllBytesWereAsciiCharacters )

    84         {

    85             return PrintableCharacterCount( aMaxNumberOfAsciiBytesToProcess, KDescriptorRawItemOffsetAfterLengthAndType, out aAllBytesWereAsciiCharacters );

    86         }

    87 

    88         protected int PrintableCharacterCount( int aMaxNumberOfAsciiBytesToProcess, int aStartRawItemIndex, out bool aAllBytesWereAsciiCharacters )

    89         {

    90             int printableCharCount = 0;

    91             int bytesRemaining = aMaxNumberOfAsciiBytesToProcess;

    92 

    93             for ( int i = aStartRawItemIndex; i < RawItems.Count && bytesRemaining > 0; i++ )

    94             {

    95                 RawItem item = RawItems[ i ];

    96                 byte[] data = item.DataArray;

    97                 //

    98                 for ( int j = 0; j < data.Length && bytesRemaining > 0; j++ )

    99                 {

   100                     byte b = data[ j ];

   101                     bool byteIsPrint = IsPrintableAsciiCharacter( b );

   102                     if ( byteIsPrint )

   103                     {

   104                         ++printableCharCount;

   105                     }

   106                     --bytesRemaining;

   107                 }

   108             }

   109             //

   110             aAllBytesWereAsciiCharacters = ( aMaxNumberOfAsciiBytesToProcess == printableCharCount );

   111             return printableCharCount;

   112         }

   113 

   114         protected static bool IsPrintableAsciiCharacter( byte aByte )

   115         {

   116             bool ret = false;

   117             //

   118             if ( aByte >= 32 /*SPACE*/ && aByte < 127 /*DEL*/ || aByte == 0x0D /*CR*/ || aByte == 0x0A /*LF*/ || aByte == 0x09 /*TAB*/ )

   119             {

   120                 ret = true;

   121             }

   122             //

   123             return ret;

   124         }

   125         #endregion

   126     }

   127 }