1 /* 2 ** Copyright 2003, Axel Dörfler, axeld@pinc-software.de. All rights reserved. 3 ** Distributed under the terms of the MIT License. 4 */ 5 #ifndef VOLUME_H 6 #define VOLUME_H 7 8 9 #include "fatfs.h" 10 11 #include <SupportDefs.h> 12 13 namespace boot { 14 class Partition; 15 } 16 17 18 namespace FATFS { 19 20 class CachedBlock; 21 class Directory; 22 23 class Volume { 24 public: 25 Volume(boot::Partition *partition); 26 ~Volume(); 27 28 status_t InitCheck(); 29 status_t GetName(char *name, size_t size) const; 30 31 int Device() const { return fDevice; } 32 Directory *Root() { return fRoot; } 33 int32 FatBits() const { return fFatBits; } 34 uint32 DataStart() const { return fDataStart; } 35 36 int32 BlockSize() const { return fBlockSize; } 37 int32 ClusterSize() const { return fSectorsPerCluster * fBytesPerSector; } 38 39 int32 BlockShift() const { return fBlockShift; } 40 int32 SectorShift() const { return fSectorShift; } 41 int32 ClusterShift() const { return fClusterShift; } 42 43 int32 NumBlocks() const { return (int32)((off_t)fTotalSectors * fBytesPerSector / fBlockSize); } 44 int32 NumSectors() const { return fTotalSectors; } 45 int32 NumClusters() const { return fTotalClusters; } 46 47 uint32 NextCluster(uint32 cluster, uint32 skip=0); 48 bool IsValidCluster(uint32 cluster) const; 49 bool IsLastCluster(uint32 cluster) const; 50 uint32 InvalidClusterID() const { return (1 << fFatBits) - 1; } 51 52 status_t AllocateCluster(uint32 previousCluster, 53 uint32& _newCluster); 54 55 off_t ClusterToOffset(uint32 cluster) const; 56 // uint32 ToCluster(off_t offset) const { return offset >> ClusterShift(); } 57 off_t BlockToOffset(off_t block) const 58 { return block << BlockShift(); } 59 uint32 ToBlock(off_t offset) const { return offset >> BlockShift(); } 60 61 private: 62 status_t _UpdateCluster(uint32 cluster, uint32 value); 63 status_t _ClusterAllocated(uint32 cluster); 64 65 protected: 66 int fDevice; 67 int32 fBlockShift; 68 int32 fSectorShift; 69 int32 fClusterShift; 70 uint32 fBlockSize; 71 // from the boot/fsinfo sectors 72 uint32 fBytesPerSector; 73 uint32 fSectorsPerCluster; 74 uint32 fReservedSectors; 75 uint8 fMediaDesc; 76 uint32 fSectorsPerFat; 77 uint32 fTotalSectors; 78 uint8 fFatCount; 79 uint16 fMaxRootEntries; 80 uint8 fActiveFat; 81 uint8 fFatBits; 82 uint32 fDataStart; 83 uint32 fTotalClusters; 84 uint32 fRootDirCluster; 85 uint16 fFSInfoSector; 86 87 CachedBlock *fCachedBlock; 88 Directory *fRoot; 89 }; 90 91 } // namespace FATFS 92 93 #endif /* VOLUME_H */ 94