author | William Roberts <williamr@symbian.org> |
Wed, 31 Mar 2010 12:33:34 +0100 | |
branch | Symbian3 |
changeset 4 | 837f303aceeb |
parent 2 | 2fe1408b6811 |
permissions | -rw-r--r-- |
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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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// in_pkt.h - packet handling routines |
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// Generic packet handling utility for mapping packet handling to the RMBufChain. |
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// |
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/** |
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@file in_pkt.h |
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@publishedAll |
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@released |
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*/ |
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#ifndef __IN_PKT_H__ |
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#define __IN_PKT_H__ |
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#include "ip6_hdr.h" // ..should eventually be <inet/ip6_hdr.h>? -- msa |
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#include "ip4_hdr.h" |
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class RMBufChain; |
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#define TPACKETHEAD_FRAGMENT 1 //< Enable iFragment in TPacketHead |
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/** |
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TScopeType is only provided so that "magic" constants can be |
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avoided in the source code. However, the max value cannot be changed |
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to anything from 0xF. The scope type is assumed to be 4 bits long |
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in many occasions. |
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The value of the scope type is directly bound the the IPv6 Scope |
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level - 1. This can be done, as IPv6 Scope level 0 is not legal |
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(or usable) in any context within the stack. |
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This allows our non-standard network scope (= 0x10) to |
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be coded internally in 4 bits (as 0xF). |
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@publishedAll |
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@released |
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@since v7.0s |
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enum TScopeType |
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{ |
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EScopeType_IF = 0x0, //< (= #KIp6AddrScopeNodeLocal - 1), id is interface index |
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EScopeType_IAP = 0x1, //< (= #KIp6AddrScopeLinkLocal - 1). id is IAP number |
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EScopeType_GLOBAL = 0xD,//< (= #KIp6AddrScopeGlobal - 1). id is global scope id |
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// |
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// no symbols defined for types 2..14 (they are also valid) |
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// |
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EScopeType_NET = 0xF //< (= #KIp6AddrScopeNetwork - 1), id is network number (must be the last entry) |
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}; |
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// |
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// TIpHeader |
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// ********* |
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class TIpHeader |
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/** |
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A simple help class that uses a union to merge handling of either an IPv4 or |
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an IPv6 header. |
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@since v7.0 |
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@publishedAll |
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@released |
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*/ |
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{ |
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public: |
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/** |
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Gets the minimum header length. |
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IPv6 header is longer than minimum IPv4 header, thus |
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returned value is for IPv4. This function only defined |
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because it is required when this class is used as template |
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parameter in TInet6Packet. |
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@return Minimum IPv4 header length |
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*/ |
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inline static TInt MinHeaderLength() {return TInet6HeaderIP4::MinHeaderLength(); } |
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/** |
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Gets the maximum header length. |
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IPv6 header always shorter than maximum IPv4 header, thus |
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returned value is for IPv4. This function is only defined |
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because "header mapping" classes are expected to have it. |
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@return Maximum IPv4 header length |
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*/ |
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inline static TInt MaxHeaderLength() {return TInet6HeaderIP4::MaxHeaderLength(); } |
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union |
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{ |
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TInet6HeaderIP4 ip4; |
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TInet6HeaderIP ip6; |
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}; |
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}; |
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class TInet6PacketBase |
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/** |
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* Thin base class for the TInet6Packet. |
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*/ |
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{ |
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public: |
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enum TAlign |
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{ |
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EAlign1 = 0, //< Align to byte (no align requirement) |
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EAlign2 = 1, //< Align to 2 byte unit (even address) |
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EAlign4 = 3, //< Align to 4 byte unit |
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EAlign8 = 7 //< Align to 8 byte unit |
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}; |
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/** |
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Constructor. |
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@param aAlign The align requirement. |
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*/ |
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TInet6PacketBase(TAlign aAlign) : iLength(0), iAlign(aAlign) {} |
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/** |
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Length of the mapped region. |
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The real mapped length as computed by the Access function. |
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If access returned non-NULL, the following is always TRUE: |
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@li aMin <= iLength |
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*/ |
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TInt iLength; |
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IMPORT_C TUint8 *Access(RMBufChain &aPacket, TInt aOffset, TInt aSize, TInt aMin); |
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inline void SetAlign(TAlign aAlign) |
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/** |
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* Changes the align requirement. |
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* |
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* @param aAlign The new align requirement. |
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*/ |
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{ |
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iAlign = aAlign; |
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} |
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protected: |
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/** |
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The align requirement. |
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*/ |
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TAlign iAlign; |
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}; |
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// TInet6Packet template |
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// ********************* |
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template <class T> |
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class TInet6Packet : public TInet6PacketBase |
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/** |
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Encapsulates an IPv6 packet header as a section of an RMBufChain. |
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The T template parameter should represent a packet header type. It should |
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support static functions MaxHeaderLength() and MinHeaderLength() that return |
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TInt values for maximum and minimum header lengths respectively. |
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@publishedAll |
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@released |
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@since v7.0 |
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*/ |
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{ |
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public: |
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TInet6Packet(TAlign aAlign = EAlign4) : TInet6PacketBase(aAlign), iHdr(NULL) |
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/** |
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Default constructor. |
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Construct an empty mapping. To be usable, the Set() function |
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must be used. |
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*/ |
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{} |
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TInet6Packet(RMBufChain &aPacket) : TInet6PacketBase(EAlign4) |
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/** |
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Constructor specifying a RMBufChain object. |
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Verify and arrange it so that a class T can be mapped |
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to a contiguous octets from the beginning of the RMBufChain |
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content, and set iHdr to point this area. |
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If this is not possible, iHdr is initialized to NULL. |
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@param aPacket |
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Packet containing the header T at offset = 0 |
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*/ |
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{ |
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iHdr = (T *)Access(aPacket, 0, T::MaxHeaderLength(), T::MinHeaderLength()); |
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} |
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TInet6Packet(RMBufChain &aPacket, TInt aOffset, TAlign aAlign = EAlign4) : TInet6PacketBase(aAlign) |
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/** |
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Constructor specifying a RMBufChain object and an offset. |
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|
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Verify and arrange it so that a class T can be mapped |
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to a contiguous octets starting at specified offset of |
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the RMBufChain content, and set iHdr to point this area. |
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If this is not possible, iHdr is initialized to NULL. |
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@param aPacket |
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Packet containing the header T at aOffset |
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@param aOffset |
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Offset of the header to be mapped. |
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@param aAlign |
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The alignement requirement. |
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*/ |
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{ |
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iHdr = (T *)Access(aPacket, aOffset, T::MaxHeaderLength(), T::MinHeaderLength()); |
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} |
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void Set(RMBufChain &aPacket, TInt aOffset, TInt aSize) |
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/** |
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Sets the packet header from a specified RMBufChain object. |
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222 |
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Verify and arrange it so that a aSize octets can be mapped |
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to a contiguous octets starting at specified offset of |
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the RMBufChain content, and set iHdr to point this area. |
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If this is not possible, iHdr is initialized to NULL. |
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Note that this differs from the contructors: the required |
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size is a parameter, and not determined by the T::MinHeaderLength(). |
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However, the "T* iHdr" is set to point the start of the requested |
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area. It's a responsibility of the user of this method to know |
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whether using this pointer is safe with the specified size parameter. |
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@param aPacket |
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Packet containing the header T at aOffset |
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@param aOffset |
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Offset (position) of the header to be mapped |
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@param aSize |
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Length of required contiguous memory |
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*/ |
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{ |
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iHdr = (T *)Access(aPacket, aOffset, aSize, aSize); |
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} |
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inline T& operator()() |
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{ |
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return *iHdr; |
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} |
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/** |
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The pointer to the mapped region (if non-NULL). If NULL, |
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then there is no mapping, and iLength == 0. |
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*/ |
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T *iHdr; |
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}; |
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#endif |