toolsandutils/e32tools/elf2e32/source/checksum.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 12 Mar 2010 15:49:27 +0200
branchRCL_3
changeset 2 99082257a271
parent 1 d4b442d23379
permissions -rw-r--r--
Revision: 201008 Kit: 201008
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// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Implementation of the checksum for the elf2e32 tool
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// @internalComponent
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// @released
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// 
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//
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#include "checksum.h"
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#include "e32imagedefs.h"
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typedef unsigned long uint32;
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typedef unsigned short uint16;
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typedef unsigned char uint8;
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/**
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Checksum every other byte
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@param aPtr    A pointer to the start of the data to be checksummed. 
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@internalComponent
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@released
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*/
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uint32 checkSum(const void *aPtr)
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{
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	const uint8 * pB=(const uint8 *)aPtr;
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	const uint8 * pE=pB+(KMaxCheckedUid*sizeof(TUid));
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	uint8 buf[(KMaxCheckedUid*sizeof(TUid))>>1];
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	uint8 * pT=(&buf[0]);
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	while (pB<pE)
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	{
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		*pT++=(*pB);
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		pB+=2;
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	}
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	unsigned short crc=0;
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	Crc(crc,&buf[0],(KMaxCheckedUid*sizeof(TUid))>>1);
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	return(crc);
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}
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//crc table
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static const uint32 crcTab[256] =
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    {
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	0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,0x8108,0x9129,0xa14a,
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	0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,
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	0x72f7,0x62d6,0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,0x2462,
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	0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,0xa56a,0xb54b,0x8528,0x9509,
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	0xe5ee,0xf5cf,0xc5ac,0xd58d,0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,
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	0x46b4,0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,0x48c4,0x58e5,
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	0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,
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	0x9969,0xa90a,0xb92b,0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12,
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	0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,0x6ca6,0x7c87,0x4ce4,
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	0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,
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	0x8d68,0x9d49,0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,0xff9f,
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	0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,0x9188,0x81a9,0xb1ca,0xa1eb,
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	0xd10c,0xc12d,0xf14e,0xe16f,0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,
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	0x6067,0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,0x02b1,0x1290,
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	0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,
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	0xe54f,0xd52c,0xc50d,0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405,
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	0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,0x26d3,0x36f2,0x0691,
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	0x16b0,0x6657,0x7676,0x4615,0x5634,0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,
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	0xb98a,0xa9ab,0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,0xcb7d,
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	0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,0x4a75,0x5a54,0x6a37,0x7a16,
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	0x0af1,0x1ad0,0x2ab3,0x3a92,0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,
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	0x8dc9,0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,0xef1f,0xff3e,
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	0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,
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	0x3eb2,0x0ed1,0x1ef0
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};
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/**
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Performs a CCITT CRC checksum on the specified data.
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On return from this function, the referenced 16 bit integer contains the checksummed 
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value.
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@param aCrc    A reference to a 16 bit integer to contain the checksummed value. 
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@param aPtr    A pointer to the start of the data to be checksummed. 
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@param aLength The length of the data to be checksummed.
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@internalComponent
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@released
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*/
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void Crc(unsigned short & aCrc,const void * aPtr,size_t aLength)
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{
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    96
	const uint8 * pB=(const uint8 *)aPtr;
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parents:
diff changeset
    97
	const uint8 * pE=pB+aLength;
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
    98
	uint32 crc=aCrc;
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
    99
    while (pB<pE)
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   100
		crc=(crc<<8)^crcTab[((crc>>8)^*pB++)&0xff];
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   101
	aCrc=(unsigned short)crc;
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   102
}
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   103
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   104
//crc table
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   105
static const uint32 CrcTab32[256] =
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   106
	{
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   107
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   108
	0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   109
	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   110
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   111
	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   112
	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   113
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   114
	0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   115
	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   116
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   117
	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   118
	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   119
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   120
	0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   121
	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   122
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   123
	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   124
	0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   125
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   126
	0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   127
	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   128
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   129
	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   130
	0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   131
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   132
	0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   133
	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   134
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   135
	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   136
	0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   137
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   138
	0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   139
	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   140
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   141
	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   142
	0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   143
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   144
	0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   145
	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   146
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   147
	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   148
	0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   149
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   150
	0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   151
	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   152
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   153
	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   154
	0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   155
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   156
	0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   157
	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   158
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   159
	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   160
	0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   161
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   162
	0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   163
	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   164
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   165
	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   166
	0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   167
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   168
	0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   169
	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   170
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   171
	};
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   172
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   173
/**
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   174
Performs a CCITT CRC-32 checksum on the specified data.
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   175
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   176
On return from this function, the referenced 32 bit integer contains the CRC
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   177
value.
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   178
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   179
@param aCrc		A reference to a 32 bit integer to contain the CRC value. 
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   180
@param aPtr		A pointer to the start of the data to be checksummed. 
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   181
@param aLength	The length of the data to be checksummed.
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   182
@internalComponent
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   183
@released
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   184
*/
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   185
void Crc32(unsigned long & aCrc, const void * aPtr, size_t aLength)
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   186
{
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   187
	const uint8 * p = (const uint8 *)aPtr;
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   188
	const uint8 * q = p + aLength;
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   189
	unsigned long crc = aCrc;
83f4b4db085c Revision: 201005
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   190
	while (p < q)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   191
		crc = (crc >> 8) ^ CrcTab32[(crc ^ *p++) & 0xff];
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   192
	aCrc = crc;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   193
}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   194