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1 // Copyright (c) 1996-2009 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 "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 // f32\sfat\inc\sl_bpb.h |
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15 // @file |
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16 // @internalTechnology |
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17 // |
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18 // |
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19 |
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20 |
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21 #ifndef SL_BPB_H |
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22 #define SL_BPB_H |
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23 |
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24 |
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25 #include "filesystem_fat.h" |
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26 using FileSystem_FAT::TFatSubType; |
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27 typedef TFatSubType TFatType; |
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28 |
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29 |
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30 const TInt KVolumeLabelSize =11; ///< Volume lable size |
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31 const TInt KFileSysTypeSize =8; ///< File system type parameter size |
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32 const TInt KVendorIdSize =8; ///< Vendor ID parameter size |
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33 const TInt KBootSectorSignature =0xAA55;///< File system Boot sector signiture |
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34 |
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35 const TInt KSizeOfFatBootSector =62; ///< Size in bytes of Boot sector parameter block (BPB), 62 for fat16|12 |
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36 const TInt KFat16VolumeLabelPos =43; ///< Position of volume lable in BPB for Fat12/16 |
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37 |
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38 const TUint32 KBootSectorNum =0; ///< Main Boot Sector number (always 0) |
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39 |
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40 //------------------------------------------------------------------------------------------------------------------- |
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41 |
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42 /** |
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43 Boot sector parameter block, enables access to all file system parameters. |
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44 Data is populated at mount time from the BPB sector |
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45 */ |
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46 class TFatBootSector |
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47 { |
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48 public: |
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49 //-- simple getters / setters |
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50 inline const TPtrC8 VendorId() const; |
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51 inline TInt BytesPerSector() const; |
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52 inline TInt SectorsPerCluster() const; |
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53 inline TInt ReservedSectors() const; |
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54 inline TInt NumberOfFats() const; |
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55 inline TInt RootDirEntries() const; |
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56 inline TInt TotalSectors() const; |
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57 inline TUint8 MediaDescriptor() const; |
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58 inline TInt FatSectors() const; |
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59 inline TInt SectorsPerTrack() const; |
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60 inline TInt NumberOfHeads() const; |
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61 inline TInt HiddenSectors() const; |
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62 inline TInt HugeSectors() const; |
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63 inline TInt PhysicalDriveNumber() const; |
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64 inline TInt ExtendedBootSignature() const; |
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65 inline TUint32 UniqueID() const; |
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66 inline const TPtrC8 VolumeLabel() const; |
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67 inline const TPtrC8 FileSysType() const; |
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68 inline TInt BootSectorSignature() const; |
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69 |
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70 inline TUint32 RootClusterNum() const {return 0;} //-- dummy |
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71 inline TUint16 FSInfoSectorNum() const {return 0;} //-- dummy |
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72 inline TUint16 BkBootRecSector() const {return 0;} //-- dummy |
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73 |
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74 |
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75 inline void SetJumpInstruction(); |
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76 inline void SetVendorID(const TDesC8& aDes); |
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77 inline void SetBytesPerSector(TInt aBytesPerSector); |
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78 inline void SetSectorsPerCluster(TInt aSectorsPerCluster); |
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79 inline void SetReservedSectors(TInt aReservedSectors); |
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80 inline void SetNumberOfFats(TInt aNumberOfFats); |
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81 inline void SetRootDirEntries(TInt aRootDirEntries); |
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82 inline void SetTotalSectors(TInt aTotalSectors); |
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83 inline void SetMediaDescriptor(TUint8 aMediaDescriptor); |
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84 inline void SetFatSectors(TInt aFatSectors); |
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85 inline void SetSectorsPerTrack(TInt aSectorsPerTrack); |
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86 inline void SetNumberOfHeads(TInt aNumberOfHeads); |
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87 inline void SetHiddenSectors(TUint32 aHiddenSectors); |
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88 inline void SetHugeSectors(TUint32 aTotalSectors); |
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89 inline void SetPhysicalDriveNumber(TInt aPhysicalDriveNumber); |
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90 inline void SetReservedByte(TUint8 aReservedByte); |
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91 inline void SetExtendedBootSignature(TInt anExtendedBootSignature); |
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92 inline void SetUniqueID(TUint32 anUniqueID); |
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93 inline void SetVolumeLabel(const TDesC8& aDes); |
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94 inline void SetFileSysType(const TDesC8& aDes); |
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95 |
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96 public: |
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97 |
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98 TFatBootSector(); |
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99 |
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100 void Initialise(); |
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101 TBool IsValid() const; |
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102 TFatType FatType(void) const; |
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103 |
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104 void Internalize(const TDesC8& aBuf); |
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105 void Externalize(TDes8& aBuf) const; |
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106 void PrintDebugInfo() const; |
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107 |
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108 //-- more advanced API, works for all FAT types |
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109 TInt FirstFatSector() const; |
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110 TInt RootDirStartSector() const; |
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111 TInt FirstDataSector() const; |
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112 |
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113 TUint32 VolumeTotalSectorNumber() const; |
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114 TUint32 TotalFatSectors() const; |
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115 TUint32 RootDirSectors() const; |
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116 |
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117 |
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118 protected: |
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119 |
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120 TUint8 iJumpInstruction[3]; ///< +0 Jump instruction used for bootable volumes |
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121 TUint8 iVendorId[KVendorIdSize]; ///< +3 Vendor ID of the file system that formatted the volume |
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122 TUint16 iBytesPerSector; ///< +11/0x0b Bytes per sector |
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123 TUint8 iSectorsPerCluster; ///< +13/0x0d Sectors per cluster ratio |
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124 TUint16 iReservedSectors; ///< +14/0x0e Number of reserved sectors on the volume |
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125 TUint8 iNumberOfFats; ///< +16/0x10 Number of Fats on the volume |
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126 TUint16 iRootDirEntries; ///< +17/0x11 Number of entries allowed in the root directory, specific to Fat12/16, zero for FAT32 |
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127 TUint16 iTotalSectors; ///< +19/0x13 Total sectors on the volume, zero for FAT32 |
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128 TUint8 iMediaDescriptor; ///< +12/0x15 Media descriptor |
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129 TUint16 iFatSectors; ///< +22/0x16 Sectors used for the Fat table, zero for FAT32 |
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130 TUint16 iSectorsPerTrack; ///< +24/0x18 Sectors per track |
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131 TUint16 iNumberOfHeads; ///< +26/0x1a Number of heads |
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132 TUint32 iHiddenSectors; ///< +28/0x1c Number of hidden sectors in the volume |
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133 TUint32 iHugeSectors; ///< +32/0x20 Total sectors in the volume, Used if totalSectors > 65535 |
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134 //this is (boot sector) offset 36 for FAT12 and 16 but comes after additional FAT36 elements |
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135 TUint8 iPhysicalDriveNumber; ///< +36/0x24 Physical drive number, not used in Symbian OS |
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136 TUint8 iReserved; ///< +37/0x25 Reserved byte |
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137 TUint8 iExtendedBootSignature; ///< +38/0x26 Extended boot signiture |
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138 TUint32 iUniqueID; ///< +39/0x27 Unique volume ID |
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139 TUint8 iVolumeLabel[KVolumeLabelSize]; ///< +43/0x2b The volume's label |
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140 TUint8 iFileSysType[KFileSysTypeSize]; ///< +54/0x36 File system type |
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141 }; |
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142 |
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143 |
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144 |
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145 |
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146 |
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147 #endif //SL_BPB_H |
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148 |