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1 // Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // C++ storage support |
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15 // |
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16 // |
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17 |
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18 #include <nifmbuf.h> |
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19 |
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20 // |
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21 // MBuf Packet Information Base |
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22 // |
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23 |
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24 EXPORT_C RMBufCell* RMBufCell::CopyL() |
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25 /** |
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26 Pseudo Copy Constructor |
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27 - refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant |
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28 */ |
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29 { |
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30 RMBuf* mbuf = RMBuf::AllocL(iThisMBuf->Size()); |
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31 |
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32 Mem::FillZ(mbuf->Buffer() + iThisMBuf->Length(), mbuf->Size() - iThisMBuf->Length()); // trs; wasteful to fill memory, but removing this constitutes a functional break, hence it has been kept as is |
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33 mbuf->SetType(EMBufHeader); // trs; internally only used for UDEB so could in theory be compiled out for UREL, but left as is to avoid a functional break |
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34 |
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35 // memory is copied to the length specified by the destination (instead of the source) because; |
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36 // a. avoid overrun if source is larger than the destination |
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37 // b. avoid FC break whereby legacy code derives from an RMBufCell object, but does not request the correct size during allocation |
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38 // eg. tcpip6 wrongly typecasts RMBufPktInfo object to RMBufRecvInfo & assumes the mbuf is large enough for any additional members |
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39 // - this works (but is still a very poor assumption) if mbufs are of K_MBufSmallSize, but fails when copying between |
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40 // RMBufCell's unless the entire mbuf is copied (ie. not just the length specified iLength) |
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41 Mem::Copy(mbuf->Buffer(), iThisMBuf->Buffer(), mbuf->Size()); // trs; ideally length should length min(iThisMBuf->Length(), mbuf->Size()) |
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42 |
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43 RMBufCell* hdr = (RMBufCell*)mbuf->Ptr(); |
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44 hdr->iThisMBuf = mbuf; |
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45 return hdr; |
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46 } |
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47 |
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48 |
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49 EXPORT_C TAny* RMBufCell::operator new(TUint aSize, TLeave /*aLeave*/, TUint aExtra) |
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50 /** |
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51 new operator. |
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52 - refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant |
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53 @param aSize A size of the cell |
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54 @param aExtra Extra size |
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55 */ |
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56 { |
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57 aSize += aExtra; |
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58 |
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59 // for backward compatibility (refer es_mbuf.h notes) cells are assumed to always be allocated within an K_MBufSmallSize sized mbuf |
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60 // - removing this assumption requires a SC break on consumers that (wrongly) assume that cells are always of this size |
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61 // - this assumption is unforunate as it restricts cells to no larger (or smaller) than this size |
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62 __ASSERT_ALWAYS(aSize <= (TUint)KMBufSmallSize, MBufExtPanic(EMbExtPanic_MBufAllocTooBig)); |
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63 |
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64 RMBuf* mbuf = RMBuf::AllocL(aSize); |
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65 mbuf->SetType(EMBufHeader); // trs; internally only used for UDEB so could in theory be compiled out for UREL, but left as is to avoid a functional break |
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66 mbuf->FillZ(); // trs; wasteful to fill memory, but removing this constitutes a functional break, hence it has been kept as is |
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67 |
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68 RMBufCell* hdr = (RMBufCell*)mbuf->Ptr(); |
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69 hdr->iThisMBuf = mbuf; |
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70 return hdr; |
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71 } |
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72 |
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73 |
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74 EXPORT_C TAny* RMBufCell::operator new(TUint aSize, TUint aExtra) __NO_THROW |
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75 /** |
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76 new operator. |
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77 - refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant |
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78 @param aSize A size of the cell |
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79 @param aExtra Extra size |
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80 */ |
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81 { |
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82 aSize += aExtra; |
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83 |
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84 // cells are assumed to always be allocated within an K_MBufSmallSize sized mbuf, refer ::new() throw notes |
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85 __ASSERT_ALWAYS(aSize <= (TUint)KMBufSmallSize, MBufExtPanic(EMbExtPanic_MBufAllocTooBig)); |
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86 |
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87 RMBuf* mbuf = RMBuf::Alloc(aSize); |
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88 if(!mbuf) |
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89 { |
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90 return mbuf; |
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91 } |
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92 mbuf->SetType(EMBufHeader); // trs; internally only used for UDEB so could in theory be compiled out for UREL, but left as is to avoid a functional break |
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93 mbuf->FillZ(); // trs; wasteful to fill memory, but removing this constitutes a functional break, hence it has been kept as is |
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94 |
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95 RMBufCell* hdr = (RMBufCell*)mbuf->Ptr(); |
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96 hdr->iThisMBuf = mbuf; |
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97 return hdr; |
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98 } |
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99 |
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100 |
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101 EXPORT_C void RMBufCell::operator delete(TAny* aPtr) |
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102 /** |
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103 delete operator |
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104 deletes the cell |
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105 */ |
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106 { |
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107 ((RMBufCell*)aPtr)->iThisMBuf->Free(); |
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108 } |
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109 |
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110 |
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111 void RMBufCell::operator delete(TAny* aPtr, TLeave, TUint) |
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112 /** |
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113 extra delete operator for exception unwinding in Code Warrior |
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114 */ |
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115 { |
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116 RMBufCell::operator delete(aPtr); |
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117 } |
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118 |
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119 void RMBufCell::operator delete(TAny* aPtr, TUint) |
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120 /** |
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121 extra delete operator for exception unwinding in Code Warrior |
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122 */ |
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123 { |
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124 RMBufCell::operator delete(aPtr); |
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125 } |
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126 |
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127 |
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128 |
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129 |