author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 25 May 2010 13:54:55 +0300 | |
branch | RCL_3 |
changeset 17 | 32ba20339036 |
parent 0 | 29b1cd4cb562 |
permissions | -rw-r--r-- |
0
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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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// |
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/** |
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@file |
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@internalComponent |
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*/ |
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#include <bluetooth/logger.h> |
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#include <e32std.h> |
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#include "CMultiAddrFilterTable.h" |
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#ifdef __FLOG_ACTIVE |
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_LIT8(KLogComponent, LOG_COMPONENT_PAN_BNEP); |
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#endif |
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|
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/** |
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Always guarantee the state of the table. |
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@internalComponent |
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*/ |
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CMultiAddrFilterTable::CMultiAddrFilterTable() |
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{ |
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Reset(); |
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} |
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|
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/** |
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Insert a filter specification into the table. This method uses an insertion |
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sort algorithm that guarantees that the filter specs are in ascending order. |
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This is inefficient on insertion but ultimately speeds up the lookup test for |
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each packet passing through the filter. |
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@note aEnd must be greater than or equal to (>=) aStart or this method will leave. |
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If an attempt is made to add a filter range beyond the capacity of the table |
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(KMaxMultiAddrFilters) the method will also leave. |
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@param aStart BNEP representation of a BT Address of the start of the multicast address range that may be passed through this filter (inclusive). |
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@param aEnd BNEP representation of a BT Address of the end of the multicast address range that may be passed through this filter (inclusive). |
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@internalComponent |
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*/ |
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TInt CMultiAddrFilterTable::Insert (const TBnepBTDevAddr& aStart, const TBnepBTDevAddr& aEnd) |
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{ |
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LOG_FUNC |
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LOG2(_L8("Start %016Lx End %016Lx"),aStart.Address(), aEnd.Address()); |
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if(KMaxMultiAddrFilters == iCtr) // Attempting to add too many filters. We don't allow that. |
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{ |
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LOG(_L8("Attempting to exceed KMaxMultiAddrFilters - leaving")); |
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return KErrTooBig; |
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} |
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if(aEnd < aStart)// This should never happen, in that it should be caught by higher-level logic, but just in case ... |
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{ |
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LOG(_L8("End of range less than start - leaving")); |
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return KErrArgument; |
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} |
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if(!iCtr) |
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{ |
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iTable[0] = aStart; // First insertion so we always insert at the "top" |
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iTable[1] = aEnd; |
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LOG2(_L8("First entry - Start %016Lx End %016Lx"),iTable[0].Address(),iTable[1].Address()); |
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++iCtr; |
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} |
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else |
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{ |
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// Okay, we already have entries so we need to do an insertion sort. |
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// It may not be efficient but we don't have to do it often and |
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//it leaves the table in a suitable state for efficient searching. |
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TUint aCtr; |
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for(aCtr = 0; aCtr < iCtr-1; ++aCtr) |
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{ |
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if(aStart < iTable[2*aCtr]) |
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{ |
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// We've found a place in the middle of the table in which we should |
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// insert, so we have to shuffle the lower end down a bit to |
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// free up a slot. |
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TUint bCtr; |
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for(bCtr = KMaxMultiAddrFilters - 1; bCtr > aCtr; --bCtr) |
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{ |
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iTable[2*bCtr] = iTable[2*(bCtr-1)]; |
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iTable[2*bCtr+1] = iTable[2*(bCtr-1)+1]; |
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} |
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// Now our insertion slot is free for our new values. |
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iTable[2*aCtr] = aStart; |
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iTable[2*aCtr+1] = aEnd; |
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LOG3(_L8("Entry %d - Start %016Lx End %016Lx"),aCtr,iTable[2*aCtr].Address(),iTable[2*aCtr+1].Address()); |
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++iCtr; |
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return KErrNone; |
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} |
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} |
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// If we get here then we didn't find an address range that started |
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99 |
// later than this one, so we can insert at the "bottom". |
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iTable[2*iCtr] = aStart; |
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101 |
iTable[2*iCtr+1] = aEnd; |
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LOG3(_L8("Entry %d - Start %04x End %04x"),iCtr,iTable[2*iCtr].Address(),iTable[2*iCtr+1].Address()); |
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103 |
++iCtr; |
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104 |
} |
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return KErrNone; |
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106 |
} |
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107 |
|
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108 |
/** |
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109 |
Resets the filter table counter to zero. Since all subsequent insertions and |
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110 |
searches are bounded by the counter, it is not necessary to remove stale data |
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111 |
from the table itself.. |
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112 |
@internalComponent |
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113 |
*/ |
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114 |
void CMultiAddrFilterTable::Reset () |
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115 |
{ |
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116 |
LOG_FUNC |
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iCtr = 0; |
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118 |
} |
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119 |
|
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120 |
/** |
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121 |
General method for testing the validity of the supplied address |
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@param aAddr The BNEP representation of the BT address to be tested |
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123 |
@return ETrue if the address is filtered out, EFalse if the address is not filtered out. |
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124 |
@internalComponent |
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125 |
*/ |
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TBool CMultiAddrFilterTable::FilteredOut (const TBnepBTDevAddr& aAddr) |
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127 |
{ |
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128 |
LOG_FUNC |
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LOG1(_L8("Checking %016Lx"),aAddr.Address()); |
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TBool retval = ETrue; // Assume the address is automatically blocked |
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131 |
TUint aCtr; |
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if(!iCtr) // No filters set, so we let everything through. |
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133 |
{ |
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retval = EFalse; |
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135 |
} |
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136 |
else |
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137 |
{ |
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138 |
for(aCtr = 0; aCtr < iCtr; ++aCtr) |
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139 |
{ |
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140 |
if(aAddr < iTable[2*aCtr]) |
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141 |
{ |
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142 |
// The table is sorted, so that if the start value exceeds |
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143 |
// the candidate address then the search can be terminated. |
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144 |
break; |
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145 |
} |
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146 |
else |
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147 |
{ |
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148 |
if((aAddr >= iTable[2*aCtr]) && |
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149 |
(aAddr <= iTable[2*aCtr+1])) |
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150 |
{ |
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151 |
// This is within the specified range so we can |
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152 |
// set the return to false and stop searching. |
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153 |
retval = EFalse; |
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154 |
break; |
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155 |
} |
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156 |
} |
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157 |
} |
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158 |
} |
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159 |
return retval; |
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160 |
} |