1 /* basicmbr.h -- MBR data structure definitions, types, and functions */ 2 3 /* This program is copyright (c) 2009-2013 by Roderick W. Smith. It is distributed 4 under the terms of the GNU GPL version 2, as detailed in the COPYING file. */ 5 6 #include <stdint.h> 7 #include <sys/types.h> 8 #include "diskio.h" 9 #include "mbrpart.h" 10 11 #ifndef __BASICMBRSTRUCTS 12 #define __BASICMBRSTRUCTS 13 14 #define MBR_SIGNATURE UINT16_C(0xAA55) 15 16 // Maximum number of MBR partitions 17 #define MAX_MBR_PARTS 128 18 19 using namespace std; 20 21 /**************************************** 22 * * 23 * MBRData class and related structures * 24 * * 25 ****************************************/ 26 27 // A 512-byte data structure into which the MBR can be loaded in one 28 // go. Also used when loading logical partitions. 29 #pragma pack(1) 30 struct TempMBR { 31 uint8_t code[440]; 32 uint32_t diskSignature; 33 uint16_t nulls; 34 struct MBRRecord partitions[4]; 35 uint16_t MBRSignature; 36 }; // struct TempMBR 37 #pragma pack () 38 39 // Possible states of the MBR 40 enum MBRValidity {invalid, gpt, hybrid, mbr}; 41 42 // Full data in tweaked MBR format 43 class BasicMBRData { 44 protected: 45 uint8_t code[440]; 46 uint32_t diskSignature; 47 uint16_t nulls; 48 // MAX_MBR_PARTS defaults to 128. This array holds both the primary and 49 // the logical partitions, to simplify data retrieval for GPT conversions. 50 MBRPart partitions[MAX_MBR_PARTS]; 51 uint16_t MBRSignature; 52 53 // Above are basic MBR data; now add more stuff.... 54 uint32_t blockSize; // block size (usually 512) 55 uint64_t diskSize; // size in blocks 56 uint32_t numHeads; // number of heads, in CHS scheme 57 uint32_t numSecspTrack; // number of sectors per track, in CHS scheme 58 DiskIO* myDisk; 59 int canDeleteMyDisk; 60 string device; 61 MBRValidity state; 62 MBRPart* GetPartition(int i); // Return primary or logical partition 63 public: 64 BasicMBRData(void); 65 BasicMBRData(string deviceFilename); 66 BasicMBRData(const BasicMBRData &); 67 ~BasicMBRData(void); 68 BasicMBRData & operator=(const BasicMBRData & orig); 69 70 // File I/O functions... 71 int ReadMBRData(const string & deviceFilename); 72 int ReadMBRData(DiskIO * theDisk, int checkBlockSize = 1); 73 int ReadLogicalParts(uint64_t extendedStart, int partNum); 74 int WriteMBRData(void); 75 int WriteMBRData(DiskIO *theDisk); 76 int WriteMBRData(const string & deviceFilename); 77 int WriteMBRData(struct TempMBR & mbr, DiskIO *theDisk, uint64_t sector); DiskSync(void)78 void DiskSync(void) {myDisk->DiskSync();} 79 void SetDisk(DiskIO *theDisk); 80 81 // Display data for user... 82 void DisplayMBRData(void); 83 void ShowState(void); 84 85 // GPT checks and fixes... 86 int CheckForGPT(void); 87 int BlankGPTData(void); 88 89 // Functions that set or get disk metadata (size, CHS geometry, etc.) SetDiskSize(uint64_t ds)90 void SetDiskSize(uint64_t ds) {diskSize = ds;} SetBlockSize(uint32_t bs)91 void SetBlockSize(uint32_t bs) {blockSize = bs;} GetValidity(void)92 MBRValidity GetValidity(void) {return state;} SetHybrid(void)93 void SetHybrid(void) {state = hybrid;} // Set hybrid flag 94 void ReadCHSGeom(void); 95 int GetPartRange(uint32_t* low, uint32_t* high); 96 int LBAtoCHS(uint64_t lba, uint8_t * chs); // Convert LBA to CHS 97 int FindOverlaps(void); 98 int NumPrimaries(void); 99 int NumLogicals(void); 100 int CountParts(void); 101 void UpdateCanBeLogical(void); 102 uint64_t FirstLogicalLBA(void); 103 uint64_t LastLogicalLBA(void); 104 int AreLogicalsContiguous(void); 105 int DoTheyFit(void); 106 int SpaceBeforeAllLogicals(void); 107 int IsLegal(void); 108 int IsEEActive(void); 109 int FindNextInUse(int start); 110 111 // Functions to create, delete, or change partitions 112 // Pass EmptyMBR 1 to clear the boot loader code, 0 to leave it intact 113 void EmptyMBR(int clearBootloader = 1); 114 void EmptyBootloader(void); 115 void AddPart(int num, const MBRPart& newPart); 116 void MakePart(int num, uint64_t startLBA, uint64_t lengthLBA, int type = 0x07, 117 int bootable = 0); 118 int SetPartType(int num, int type); 119 int SetPartBootable(int num, int bootable = 1); 120 int MakeBiggestPart(int i, int type); // Make partition filling most space 121 void DeletePartition(int i); 122 int SetInclusionwChecks(int num, int inclStatus); 123 void RecomputeCHS(int partNum); 124 void SortMBR(int start = 0); 125 int DeleteOversizedParts(); 126 int DeleteExtendedParts(); 127 void OmitOverlaps(void); 128 void MaximizeLogicals(); 129 void MaximizePrimaries(); 130 void TrimPrimaries(); 131 void MakeLogicalsContiguous(void); 132 void MakeItLegal(void); 133 int RemoveLogicalsFromFirstFour(void); 134 int MovePrimariesToFirstFour(void); 135 int CreateExtended(void); 136 137 // Functions to find information on free space.... 138 uint64_t FindFirstAvailable(uint64_t start = 1); 139 uint64_t FindLastInFree(uint64_t start); 140 uint64_t FindFirstInFree(uint64_t start); 141 int SectorUsedAs(uint64_t sector, int topPartNum = MAX_MBR_PARTS); 142 143 // Functions to extract data on specific partitions.... 144 uint8_t GetStatus(int i); 145 uint8_t GetType(int i); 146 uint64_t GetFirstSector(int i); 147 uint64_t GetLength(int i); 148 149 // User interaction functions.... 150 int DoMenu(const string& prompt = "\nMBR command (? for help): "); 151 void ShowCommands(void); 152 }; // class BasicMBRData 153 154 #endif 155