1 // Copyright (c) 2006-2009 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.symbianfoundation.org/legal/licencesv10.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 // e32\include\memmodel\epoc\mmubase\kblockmap.h |
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15 // Kernel-side functionality for processing block maps |
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16 // |
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17 // |
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18 |
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19 #ifndef __KBLOCKMAP_H__ |
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20 #define __KBLOCKMAP_H__ |
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21 |
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22 #include <e32ldr.h> |
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23 |
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24 /** |
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25 The kernel-side representation of a block map. |
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26 */ |
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27 class TBlockMap |
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28 { |
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29 public: |
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30 TBlockMap(); |
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31 ~TBlockMap(); |
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32 |
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33 /** |
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34 Initialise and populate kernel-side representation from a user-side block map |
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35 |
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36 @param aBlockMapInfo The user-side block map info structure. |
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37 |
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38 @param aBlockMapEntries Pointer to a buffer containg the user-side block map entries. |
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39 This object takes ownership of the buffer. |
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40 |
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41 @param aBlockMapEntriesSize The size of the user-side block map entries in bytes. |
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42 |
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43 @param aReadUnitShift Log2 of the paging device's read unit size. |
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44 |
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45 @param aDataLengthInFile The length of the (possibly compressed) code in the file. |
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46 */ |
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47 TInt Initialise(const SBlockMapInfoBase& aBlockMapInfo, |
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48 TBlockMapEntryBase* aBlockMapEntries, |
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49 TInt aBlockMapEntriesSize, |
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50 TInt aReadUnitShift, |
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51 TInt aDataLengthInFile); |
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52 |
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53 /** |
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54 A function supplied to Read that is called to read the actual data. |
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55 |
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56 @param aArg1 An argument parameter passed to read. |
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57 @param aArg2 Another argument parameter passed to read. |
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58 @param aBuffer The address of the buffer to read the data into. |
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59 @param aBlockNumber The block number to read. |
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60 @param aBlockCount The number of blocks to read. |
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61 */ |
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62 typedef TInt (*TReadFunc)(TAny* aArg1, TAny* aArg2, TLinAddr aBuffer, TInt aBlockNumber, TInt aBlockCount); |
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63 |
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64 /** |
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65 Read data from the file described by the block map into a buffer. |
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66 |
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67 @param aBuffer The buffer into which to read the data. |
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68 @param aPos The offset from the start of the data at which to read. |
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69 @param aLength The length of data to read in bytes. |
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70 @param aReadUnitShift Log2 of the paging device's read unit size. |
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71 @param aReadFunc The function to call to read the blocks of data. |
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72 @param aArg1 An argument parameter passed to read. |
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73 @param aArg2 Another argument parameter passed to read. |
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74 |
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75 @return The offset into the buffer at which the data starts, or one of the system-wide error |
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76 codes. |
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77 */ |
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78 TInt Read(TLinAddr aBuffer, TInt aPos, TInt aLength, TInt aReadUnitShift, TReadFunc aReadFunc, TAny* aArg1, TAny* aArg2) const; |
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79 |
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80 /** |
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81 A contiguous area of media containing (possibly compressed) code. |
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82 */ |
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83 struct SExtent |
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84 { |
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85 TInt iDataOffset; // position in file from, counting from start of code data |
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86 TUint iBlockNumber; // block number containg this position |
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87 }; |
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88 |
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89 inline TInt Count() const; |
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90 inline const SExtent& Extent(TInt aIndex) const; |
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91 inline TInt DataLength() const; |
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92 |
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93 /** |
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94 Print out the contents of this object for debugging purposes. |
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95 This method is only implemented in debug builds. |
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96 */ |
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97 void Dump() const; |
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98 |
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99 private: |
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100 |
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101 TInt FindFirstExtent(TInt aPos) const; |
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102 |
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103 private: |
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104 |
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105 TInt iDataLength; |
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106 TInt iExtentCount; |
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107 SExtent* iExtents; |
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108 }; |
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109 |
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110 inline TInt TBlockMap::Count() const |
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111 { |
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112 return iExtentCount; |
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113 } |
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114 |
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115 inline const TBlockMap::SExtent& TBlockMap::Extent(TInt aIndex) const |
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116 { |
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117 return iExtents[aIndex]; |
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118 } |
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119 |
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120 inline TInt TBlockMap::DataLength() const |
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121 { |
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122 return iDataLength; |
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123 } |
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124 |
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125 #endif |
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