1 /* gpt.h -- GPT and data structure definitions, types, and 2 functions */ 3 4 /* This program is copyright (c) 2009-2011 by Roderick W. Smith. It is distributed 5 under the terms of the GNU GPL version 2, as detailed in the COPYING file. */ 6 7 #ifndef __GPTSTRUCTS 8 #define __GPTSTRUCTS main()9 10 #include <stdint.h> 11 #include <sys/types.h> 12 #include "gptpart.h" 13 #include "support.h" 14 #include "mbr.h" 15 #include "bsd.h" 16 #include "gptpart.h" 17 18 // Default values for sector alignment 19 #define DEFAULT_ALIGNMENT 2048 20 #define MAX_ALIGNMENT 65536 21 #define MIN_AF_ALIGNMENT 8 22 23 // Below constant corresponds to a ~279GiB (300GB) disk, since the 24 // smallest Advanced Format drive I know of is 320GB in size 25 #define SMALLEST_ADVANCED_FORMAT UINT64_C(585937500) 26 27 using namespace std; 28 29 /**************************************** 30 * * 31 * GPTData class and related structures * 32 * * 33 ****************************************/ 34 35 // Validity state of GPT data 36 enum GPTValidity {gpt_valid, gpt_corrupt, gpt_invalid}; 37 38 // Which set of partition data to use 39 enum WhichToUse {use_gpt, use_mbr, use_bsd, use_new, use_abort}; 40 41 // Header (first 512 bytes) of GPT table 42 #pragma pack(1) 43 struct GPTHeader { 44 uint64_t signature; 45 uint32_t revision; 46 uint32_t headerSize; 47 uint32_t headerCRC; 48 uint32_t reserved; 49 uint64_t currentLBA; 50 uint64_t backupLBA; 51 uint64_t firstUsableLBA; 52 uint64_t lastUsableLBA; 53 GUIDData diskGUID; 54 uint64_t partitionEntriesLBA; 55 uint32_t numParts; 56 uint32_t sizeOfPartitionEntries; 57 uint32_t partitionEntriesCRC; 58 unsigned char reserved2[GPT_RESERVED]; 59 }; // struct GPTHeader 60 #pragma pack () 61 62 // Data in GPT format 63 class GPTData { 64 protected: 65 struct GPTHeader mainHeader; 66 GPTPart *partitions; 67 uint32_t numParts; // # of partitions the table can hold 68 struct GPTHeader secondHeader; 69 MBRData protectiveMBR; 70 string device; // device filename 71 DiskIO myDisk; 72 uint32_t blockSize; // device logical block size 73 uint32_t physBlockSize; // device physical block size (or 0 if it can't be determined) 74 uint64_t diskSize; // size of device, in logical blocks 75 GPTValidity state; // is GPT valid? 76 int justLooking; // Set to 1 if program launched with "-l" or if read-only 77 int mainCrcOk; 78 int secondCrcOk; 79 int mainPartsCrcOk; 80 int secondPartsCrcOk; 81 int apmFound; // set to 1 if APM detected 82 int bsdFound; // set to 1 if BSD disklabel detected in MBR 83 uint32_t sectorAlignment; // Start partitions at multiples of sectorAlignment 84 int beQuiet; 85 WhichToUse whichWasUsed; 86 87 int LoadHeader(struct GPTHeader *header, DiskIO & disk, uint64_t sector, int *crcOk); 88 int LoadPartitionTable(const struct GPTHeader & header, DiskIO & disk, uint64_t sector = 0); 89 int CheckTable(struct GPTHeader *header); 90 int SaveHeader(struct GPTHeader *header, DiskIO & disk, uint64_t sector); 91 int SavePartitionTable(DiskIO & disk, uint64_t sector); 92 public: 93 // Basic necessary functions.... 94 GPTData(void); 95 GPTData(const GPTData &); 96 GPTData(string deviceFilename); 97 virtual ~GPTData(void); 98 GPTData & operator=(const GPTData & orig); 99 100 // Verify (or update) data integrity 101 int Verify(void); 102 int CheckGPTSize(void); 103 int CheckHeaderValidity(void); 104 int CheckHeaderCRC(struct GPTHeader* header, int warn = 0); 105 void RecomputeCRCs(void); 106 void RebuildMainHeader(void); 107 void RebuildSecondHeader(void); 108 int VerifyMBR(void) {return protectiveMBR.FindOverlaps();} 109 int FindHybridMismatches(void); 110 int FindOverlaps(void); 111 int FindInsanePartitions(void); 112 113 // Load or save data from/to disk 114 int SetDisk(const string & deviceFilename); 115 DiskIO* GetDisk(void) {return &myDisk;} 116 int LoadMBR(const string & f) {return protectiveMBR.ReadMBRData(f);} 117 int WriteProtectiveMBR(void) {return protectiveMBR.WriteMBRData(&myDisk);} 118 void PartitionScan(void); 119 int LoadPartitions(const string & deviceFilename); 120 int ForceLoadGPTData(void); 121 int LoadMainTable(void); 122 int LoadSecondTableAsMain(void); 123 int SaveGPTData(int quiet = 0); 124 int SaveGPTBackup(const string & filename); 125 int LoadGPTBackup(const string & filename); 126 int SaveMBR(void); 127 int DestroyGPT(void); 128 int DestroyMBR(void); 129 130 // Display data.... 131 void ShowAPMState(void); 132 void ShowGPTState(void); 133 void DisplayGPTData(void); 134 void DisplayMBRData(void) {protectiveMBR.DisplayMBRData();} 135 void ShowPartDetails(uint32_t partNum); 136 137 // Convert between GPT and other formats 138 virtual WhichToUse UseWhichPartitions(void); 139 void XFormPartitions(void); 140 int XFormDisklabel(uint32_t partNum); 141 int XFormDisklabel(BSDData* disklabel); 142 int OnePartToMBR(uint32_t gptPart, int mbrPart); // add one partition to MBR. Returns 1 if successful 143 144 // Adjust GPT structures WITHOUT user interaction... 145 int SetGPTSize(uint32_t numEntries, int fillGPTSectors = 1); 146 int MoveMainTable(uint64_t pteSector); 147 void BlankPartitions(void); 148 int DeletePartition(uint32_t partNum); 149 uint32_t CreatePartition(uint32_t partNum, uint64_t startSector, uint64_t endSector); 150 void SortGPT(void); 151 int SwapPartitions(uint32_t partNum1, uint32_t partNum2); 152 int ClearGPTData(void); 153 void MoveSecondHeaderToEnd(); 154 int SetName(uint32_t partNum, const UnicodeString & theName); 155 void SetDiskGUID(GUIDData newGUID); 156 int SetPartitionGUID(uint32_t pn, GUIDData theGUID); 157 void RandomizeGUIDs(void); 158 int ChangePartType(uint32_t pn, PartType theGUID); 159 void MakeProtectiveMBR(void) {protectiveMBR.MakeProtectiveMBR();} 160 void RecomputeCHS(void); 161 int Align(uint64_t* sector); 162 void SetProtectiveMBR(BasicMBRData & newMBR) {protectiveMBR = newMBR;} 163 164 // Return data about the GPT structures.... 165 WhichToUse GetState(void) {return whichWasUsed;} 166 int GetPartRange(uint32_t* low, uint32_t* high); 167 int FindFirstFreePart(void); 168 uint32_t GetNumParts(void) {return mainHeader.numParts;} 169 uint64_t GetTableSizeInSectors(void) {return (((numParts * GPT_SIZE) / blockSize) + 170 (((numParts * GPT_SIZE) % blockSize) != 0)); } 171 uint64_t GetMainHeaderLBA(void) {return mainHeader.currentLBA;} 172 uint64_t GetSecondHeaderLBA(void) {return secondHeader.currentLBA;} 173 uint64_t GetMainPartsLBA(void) {return mainHeader.partitionEntriesLBA;} 174 uint64_t GetSecondPartsLBA(void) {return secondHeader.partitionEntriesLBA;} 175 uint64_t GetFirstUsableLBA(void) {return mainHeader.firstUsableLBA;} 176 uint64_t GetLastUsableLBA(void) {return mainHeader.lastUsableLBA;} 177 uint32_t CountParts(void); 178 bool ValidPartNum (const uint32_t partNum); 179 const GPTPart & operator[](uint32_t partNum) const; 180 const GUIDData & GetDiskGUID(void) const; 181 uint32_t GetBlockSize(void) {return blockSize;} 182 183 // Find information about free space 184 uint64_t FindFirstAvailable(uint64_t start = 0); 185 uint64_t FindFirstUsedLBA(void); 186 uint64_t FindFirstInLargest(void); 187 uint64_t FindLastAvailable(); 188 uint64_t FindLastInFree(uint64_t start); 189 uint64_t FindFreeBlocks(uint32_t *numSegments, uint64_t *largestSegment); 190 int IsFree(uint64_t sector, uint32_t *partNum = NULL); 191 int IsFreePartNum(uint32_t partNum); 192 int IsUsedPartNum(uint32_t partNum); 193 194 // Change how functions work, or return information on same 195 void SetAlignment(uint32_t n); 196 uint32_t ComputeAlignment(void); // Set alignment based on current partitions 197 uint32_t GetAlignment(void) {return sectorAlignment;} 198 void JustLooking(int i = 1) {justLooking = i;} 199 void BeQuiet(int i = 1) {beQuiet = i;} 200 WhichToUse WhichWasUsed(void) {return whichWasUsed;} 201 202 // Endianness functions 203 void ReverseHeaderBytes(struct GPTHeader* header); 204 void ReversePartitionBytes(); // for endianness 205 206 // Attributes functions 207 int ManageAttributes(int partNum, const string & command, const string & bits); 208 void ShowAttributes(const uint32_t partNum); 209 void GetAttribute(const uint32_t partNum, const string& attributeBits); 210 211 }; // class GPTData 212 213 // Function prototypes.... 214 int SizesOK(void); 215 216 #endif 217