cryptoservices/certificateandkeymgmt/asn1/gentimedec.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 10 Sep 2009 14:01:51 +0300
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parent 0 2c201484c85f
permissions -rw-r--r--
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/*
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* Copyright (c) 1998-2009 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 the License "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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* This file contains the implementation of the General Time ASN1 class.
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* Fully support three forms of ASN.1 generalizedTime
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* Fraction of second accepts 1,2 or 3 digits input. This is to maximize the tolerance of client input 
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*
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*/
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#include <asn1dec.h>
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EXPORT_C TASN1DecGeneralizedTime::TASN1DecGeneralizedTime()
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	{
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	}
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TTime TASN1DecGeneralizedTime::GetTimeL(const TDesC8& aSource)
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	{
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	// __OFFSET__ Extract corrected time to include offset too.
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	// Did this checking ought to be done on creation rather than when we attempt to get the result?
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	// I guess we ought to check that the contents we've got are long enough to contain a time!
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	if (aSource.Length()<13)
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		{
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		User::Leave(KErrArgument);
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		}
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	// Check all digits the main bit of time are valid, YYYY:MM:DD HH:MM
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	TInt i;
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	for (i=0;i<12;i++)
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		{
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		TUint8 j;
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		j=(TUint8)(aSource[i]-'0');
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		if (j>=10)
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			{
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			User::Leave(KErrArgument);
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			}
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		}
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	//check seconds are valid if present
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	i = 12;
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	if(aSource.Length() > 13)
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		{
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			if ((aSource[i] < '0') || (aSource[i] > '9')
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					|| (aSource[i+1] < '0') || (aSource[i+1] > '9'))
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				User::Leave(KErrArgument);
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		}
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	i = 14;
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	//if the time string is longer 
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	if(aSource.Length() > 14)
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		{
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		TInt countDot = 0;
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		TInt countOperator = 0;
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		TInt countZ = 0;
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		//check if the extra bytes are valid
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		while(i < aSource.Length())
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			{
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				switch(aSource[i])
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				{
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				case '.': //'.' can't appear more than once and at least one digit should follow
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					countDot++;
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					if(countDot > 1)
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						User::Leave(KErrArgument);
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					if(aSource.Length()-1 ==  i) //error, '.' is last char in time string
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						User::Leave(KErrArgument);
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					else
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						{
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							if(aSource[i+1] - '0' < 0 || aSource[i+1] - '0' > 9)
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								User::Leave(KErrArgument);
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						}
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					break;
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				case '+':
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				case '-': // '+' and '-' can't appear more than once and at least four digits should follow
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						  // After that, we reach either EOF or 'Z', no more char could follow
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					countOperator++;
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					if(countOperator > 1)
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						User::Leave(KErrArgument);
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					if(aSource.Length()-1 < i + 4) //error, not enough digits following operator
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						User::Leave(KErrArgument);
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					else
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						{
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						for(TInt j = i+1; j <= i+4; j++)
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							if(aSource[j] - '0' < 0 || aSource[j] -'0' > 9)
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								User::Leave(KErrArgument);
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						if(aSource.Length() > i + 6)//error, unexpected rubbish
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							User::Leave(KErrArgument);
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						if(aSource.Length() == i + 6 && aSource[i+5] != 'Z')
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							User::Leave(KErrArgument);
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						}
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   111
					
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parents: 0
diff changeset
   112
					
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parents: 0
diff changeset
   113
					break;
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parents: 0
diff changeset
   114
				case 'Z': //'Z' can't appear more than once and must be the last char in time string
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   115
					countZ++;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   116
					if(countZ > 1)
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parents: 0
diff changeset
   117
						User::Leave(KErrArgument);
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parents: 0
diff changeset
   118
					
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parents: 0
diff changeset
   119
					if(aSource.Length()-1 > i) //error, something following 'Z'
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   120
						User::Leave(KErrArgument);
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parents: 0
diff changeset
   121
					
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parents: 0
diff changeset
   122
					
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parents: 0
diff changeset
   123
					break;
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parents: 0
diff changeset
   124
				default: //so is this a digit?
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   125
					if(aSource[i] -'0' < 0 || aSource[i] -'0' > 9)
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   126
						User::Leave(KErrArgument);
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parents: 0
diff changeset
   127
				}
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parents: 0
diff changeset
   128
				i++;
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diff changeset
   129
			}
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parents: 0
diff changeset
   130
			
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parents: 0
diff changeset
   131
		
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   132
		}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   133
	// Uh-oh, looks like we're going to have to pull each bit manually and pop it in a TDateTime thing
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parents: 0
diff changeset
   134
	TInt Year,Month,Day,Hour,Minute,Second=0;		// Only set seconds to zero 'cos they are optional, everything else is going to be set
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parents: 0
diff changeset
   135
	TInt MicroSecond = 0;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   136
	TInt offsetIntHours = 0, offsetIntMinutes = 0;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   137
	TTimeIntervalHours offsetHours = 0;
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parents: 0
diff changeset
   138
	TTimeIntervalMinutes offsetMinutes = 0;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   139
	Year=(aSource[0]-'0')*1000+(aSource[1]-'0')*100+(aSource[2]-'0')*10+(aSource[3]-'0');
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   140
	Month=(aSource[4]-'0')*10+aSource[5]-'0';
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   141
	Month--;										// Because the enum for months starts at 0 not 1
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   142
	Day=(aSource[6]-'0')*10+aSource[7]-'0';
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   143
	Day--;										// Because the enum for days starts at 0 not 1
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   144
	Hour=(aSource[8]-'0')*10+aSource[9]-'0';
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   145
	Minute=(aSource[10]-'0')*10+aSource[11]-'0';
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   146
	TInt Pos=12;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   147
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   148
	
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   149
	if (aSource.Length()>13)
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   150
		{
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   151
			// seconds
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   152
			Second = (aSource[Pos++]-'0')*10;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   153
			Second += aSource[Pos++]-'0';
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   154
			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   155
		}
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   156
	
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   157
	// check range for various components
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   158
	if (Month<EJanuary || Month>EDecember)
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   159
		{
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   160
		User::Leave(KErrArgument);
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   161
		}
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   162
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   163
	TMonth month = (TMonth)Month;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   164
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   165
	if (	(Day<0 || Day>=Time::DaysInMonth(Year,month))	||
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   166
			(Hour<0 || Hour>=24)	||
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   167
			(Minute<0 || Minute>=60)	||
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   168
			(Second<0 || Second>=60)	)
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   169
		{
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   170
		User::Leave(KErrArgument);
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   171
		}
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   172
	
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   173
	//optional 3 bytes fraction of seconds
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   174
	//Converts the fraction of seconds to microsecond
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   175
	if(aSource.Length() > Pos && aSource[Pos] == '.')
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   176
		{
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   177
		Pos++;			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   178
		
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   179
		TInt multiplier = 100000;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   180
			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   181
		// parse fraction of second
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   182
		while(Pos <= 17 && Pos < aSource.Length())
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   183
			{
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   184
			if(!((aSource[Pos] >= '0') && (aSource[Pos] <= '9')))
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   185
				break; //fraction ended
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   186
					
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   187
			MicroSecond += (aSource[Pos++]-'0') * multiplier;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   188
			multiplier /= 10;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   189
			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   190
			}			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   191
		
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   192
		}
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   193
	
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   194
	if (aSource.Length()>Pos)
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   195
		{
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   196
		TBool aheadUTC = EFalse;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   197
		switch (aSource[Pos])
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   198
			{
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   199
		case 'Z':
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   200
			// Zulu - nothing more to do
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   201
			break;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   202
		case '+':
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   203
			//'+' indicates local time is ahead of UTC, need to substract the offset later
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   204
			aheadUTC = ETrue;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   205
			// The case fall-through is intentional, both cases have the same functionality, with a different
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   206
			// aheadUTC value
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   207
		case '-':
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   208
			{//brackets are required to prevent armv5 warning and gccxml errors
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   209
			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   210
			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   211
			//'-' indicates local time is behind of UTC, need to add the offset later
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   212
			//if we are in here with '-', aheadUTC has already been set to the correct value
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   213
			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   214
			Pos++;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   215
			
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   216
						
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   217
			//parse
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   218
			TInt multiplier = 10;
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   219
			for(TInt i = 0; i <= 3; i++)
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   220
				{
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   221
					if(i < 2)
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   222
						offsetIntHours += (aSource[Pos + i]-'0') * multiplier; 
35751d3474b7 Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   223
					else
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						offsetIntMinutes += (aSource[Pos + i]-'0') * (TInt)multiplier; 
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					multiplier = (multiplier == 10)? 1 : 10;
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   227
							
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   228
									
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   229
						
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				}
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			//expected range,
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			//offset hour range: 0-23
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			//offset minute range: 0-59
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			if(offsetIntHours < 0 || offsetIntHours > 23 || 
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					offsetIntMinutes < 0 || offsetIntMinutes > 59)
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				User::Leave(KErrArgument);
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			offsetHours = aheadUTC ? -offsetIntHours : offsetIntHours ;
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			offsetMinutes =  aheadUTC ? -offsetIntMinutes :  offsetIntMinutes;
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			break;
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			}
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		default:
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			// Error!
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			User::Leave(KErrArgument);
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			break;
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			}
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		}
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   250
	
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   251
	
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	TDateTime D(Year, month,Day,Hour,Minute,Second,MicroSecond);
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   254
	
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	TTime T(D);
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	T = T + offsetHours;
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	T = T + offsetMinutes;
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	return T;
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	}
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EXPORT_C TTime TASN1DecGeneralizedTime::DecodeDERL(const TDesC8& aSource,TInt& aPos)
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	{
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	TPtrC8 Source=aSource.Mid(aPos);
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	TASN1DecGeneric gen(Source);
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	gen.InitL();
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	TTime t = GetTimeL(gen.GetContentDER());
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	aPos+=gen.LengthDER();
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	return t;
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	}
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EXPORT_C TTime TASN1DecGeneralizedTime::DecodeDERL(const TASN1DecGeneric& aGen)
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	{
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	return GetTimeL(aGen.GetContentDER());
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	}