sysperfana/heapanalyser/Libraries/Engine/HeapLib/Cells/Descriptors/Implementations/Ascii/DesAsciiAlgorithmBase.cs
/*
* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Nokia Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description:
*
*/
using System;
using System.Collections.Generic;
using System.Text;
using SymbianUtils.RawItems;
using HeapLib.Statistics;
namespace HeapLib.Cells.Descriptors.Implementations.Ascii
{
internal class DesAsciiAlgorithmBase : DescriptorAlgorithmBase
{
#region Constructors & destructor
public DesAsciiAlgorithmBase( HeapStatistics aStats )
: base( aStats )
{
}
#endregion
#region Internal constants
protected const int KDescriptorRawItemOffsetEBufC = KDescriptorRawItemOffsetAfterLengthAndType + 1; // Allows for [Type+Length] + MaxLength
#endregion
#region Internal methods
protected string ConvertToText( int aLengthInUnicodeChars )
{
return ConvertToText( aLengthInUnicodeChars, KDescriptorRawItemOffsetAfterLengthAndType );
}
protected string ConvertToText( int aLengthInAsciiChars, int aStartRawItemIndex )
{
StringBuilder text = new StringBuilder();
for ( int i = aStartRawItemIndex; i < RawItems.Count && i < Math.Min( aLengthInAsciiChars, DescriptorAlgorithmBase.KDescriptorTextMaxLength ); i++ )
{
RawItem item = RawItems[ i ];
//
text.Append( item.OriginalCharacterisedData );
}
//
string ret = text.ToString();
if ( ret.Length > aLengthInAsciiChars )
{
ret = ret.Substring( 0, aLengthInAsciiChars );
}
return ret;
}
protected int PrintableCharacterCount( int aMaxNumberOfAsciiBytesToProcess, out bool aAllBytesWereAsciiCharacters )
{
return PrintableCharacterCount( aMaxNumberOfAsciiBytesToProcess, KDescriptorRawItemOffsetAfterLengthAndType, out aAllBytesWereAsciiCharacters );
}
protected int PrintableCharacterCount( int aMaxNumberOfAsciiBytesToProcess, int aStartRawItemIndex, out bool aAllBytesWereAsciiCharacters )
{
int printableCharCount = 0;
int bytesRemaining = aMaxNumberOfAsciiBytesToProcess;
for ( int i = aStartRawItemIndex; i < RawItems.Count && bytesRemaining > 0; i++ )
{
RawItem item = RawItems[ i ];
byte[] data = item.DataArray;
//
for ( int j = 0; j < data.Length && bytesRemaining > 0; j++ )
{
byte b = data[ j ];
bool byteIsPrint = IsPrintableAsciiCharacter( b );
if ( byteIsPrint )
{
++printableCharCount;
}
--bytesRemaining;
}
}
//
aAllBytesWereAsciiCharacters = ( aMaxNumberOfAsciiBytesToProcess == printableCharCount );
return printableCharCount;
}
protected static bool IsPrintableAsciiCharacter( byte aByte )
{
bool ret = false;
//
if ( aByte >= 32 /*SPACE*/ && aByte < 127 /*DEL*/ || aByte == 0x0D /*CR*/ || aByte == 0x0A /*LF*/ || aByte == 0x09 /*TAB*/ )
{
ret = true;
}
//
return ret;
}
#endregion
}
}