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 #include <stdint.h> 8 #include <sys/types.h> 9 #include "gptpart.h" 10 #include "support.h" 11 #include "mbr.h" 12 #include "bsd.h" 13 #include "gptpart.h" 14 15 #ifndef __GPTSTRUCTS 16 #define __GPTSTRUCTS 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 61 // Data in GPT format 62 class GPTData { 63 protected: 64 struct GPTHeader mainHeader; 65 GPTPart *partitions; 66 uint32_t numParts; // # of partitions the table can hold 67 struct GPTHeader secondHeader; 68 MBRData protectiveMBR; 69 string device; // device filename 70 DiskIO myDisk; 71 uint32_t blockSize; // device block size 72 uint64_t diskSize; // size of device, in blocks 73 GPTValidity state; // is GPT valid? 74 int justLooking; // Set to 1 if program launched with "-l" or if read-only 75 bool syncing; // Set to true if we should sync and reload the partition table 76 int mainCrcOk; 77 int secondCrcOk; 78 int mainPartsCrcOk; 79 int secondPartsCrcOk; 80 int apmFound; // set to 1 if APM detected 81 int bsdFound; // set to 1 if BSD disklabel detected in MBR 82 uint32_t sectorAlignment; // Start partitions at multiples of sectorAlignment 83 int beQuiet; 84 WhichToUse whichWasUsed; 85 86 int LoadHeader(struct GPTHeader *header, DiskIO & disk, uint64_t sector, int *crcOk); 87 int LoadPartitionTable(const struct GPTHeader & header, DiskIO & disk, uint64_t sector = 0); 88 int CheckTable(struct GPTHeader *header); 89 int SaveHeader(struct GPTHeader *header, DiskIO & disk, uint64_t sector); 90 int SavePartitionTable(DiskIO & disk, uint64_t sector); 91 public: 92 // Basic necessary functions.... 93 GPTData(void); 94 GPTData(string deviceFilename); 95 virtual ~GPTData(void); 96 GPTData & operator=(const GPTData & orig); 97 98 // Verify (or update) data integrity 99 int Verify(void); 100 int CheckGPTSize(void); 101 int CheckHeaderValidity(void); 102 int CheckHeaderCRC(struct GPTHeader* header, int warn = 0); 103 void RecomputeCRCs(void); 104 void RebuildMainHeader(void); 105 void RebuildSecondHeader(void); VerifyMBR(void)106 int VerifyMBR(void) {return protectiveMBR.FindOverlaps();} 107 int FindHybridMismatches(void); 108 int FindOverlaps(void); 109 int FindInsanePartitions(void); 110 111 // Load or save data from/to disk 112 int SetDisk(const string & deviceFilename); GetDisk(void)113 DiskIO* GetDisk(void) {return &myDisk;} LoadMBR(const string & f)114 int LoadMBR(const string & f) {return protectiveMBR.ReadMBRData(f);} WriteProtectiveMBR(void)115 int WriteProtectiveMBR(void) {return protectiveMBR.WriteMBRData(&myDisk);} 116 void PartitionScan(void); 117 int LoadPartitions(const string & deviceFilename); 118 int ForceLoadGPTData(void); 119 int LoadMainTable(void); 120 int LoadSecondTableAsMain(void); 121 int SaveGPTData(int quiet = 0); 122 int SaveGPTBackup(const string & filename); 123 int LoadGPTBackup(const string & filename); 124 int SaveMBR(void); 125 int DestroyGPT(void); 126 int DestroyMBR(void); 127 128 // Display data.... 129 void ShowAPMState(void); 130 void ShowGPTState(void); 131 void DisplayGPTData(void); DisplayMBRData(void)132 void DisplayMBRData(void) {protectiveMBR.DisplayMBRData();} 133 void ShowPartDetails(uint32_t partNum); 134 135 // Convert between GPT and other formats 136 virtual WhichToUse UseWhichPartitions(void); 137 void XFormPartitions(void); 138 int XFormDisklabel(uint32_t partNum); 139 int XFormDisklabel(BSDData* disklabel); 140 int OnePartToMBR(uint32_t gptPart, int mbrPart); // add one partition to MBR. Returns 1 if successful 141 142 // Adjust GPT structures WITHOUT user interaction... 143 int SetGPTSize(uint32_t numEntries, int fillGPTSectors = 1); 144 void BlankPartitions(void); 145 int DeletePartition(uint32_t partNum); 146 uint32_t CreatePartition(uint32_t partNum, uint64_t startSector, uint64_t endSector); 147 void SortGPT(void); 148 int SwapPartitions(uint32_t partNum1, uint32_t partNum2); 149 int ClearGPTData(void); 150 void MoveSecondHeaderToEnd(); 151 int SetName(uint32_t partNum, const UnicodeString & theName); 152 void SetDiskGUID(GUIDData newGUID); 153 int SetPartitionGUID(uint32_t pn, GUIDData theGUID); 154 void RandomizeGUIDs(void); 155 int ChangePartType(uint32_t pn, PartType theGUID); MakeProtectiveMBR(void)156 void MakeProtectiveMBR(void) {protectiveMBR.MakeProtectiveMBR();} 157 void RecomputeCHS(void); 158 int Align(uint64_t* sector); SetProtectiveMBR(BasicMBRData & newMBR)159 void SetProtectiveMBR(BasicMBRData & newMBR) {protectiveMBR = newMBR;} 160 161 // Return data about the GPT structures.... GetState(void)162 WhichToUse GetState(void) {return whichWasUsed;} 163 int GetPartRange(uint32_t* low, uint32_t* high); 164 int FindFirstFreePart(void); GetNumParts(void)165 uint32_t GetNumParts(void) {return mainHeader.numParts;} GetMainHeaderLBA(void)166 uint64_t GetMainHeaderLBA(void) {return mainHeader.currentLBA;} GetSecondHeaderLBA(void)167 uint64_t GetSecondHeaderLBA(void) {return secondHeader.currentLBA;} GetMainPartsLBA(void)168 uint64_t GetMainPartsLBA(void) {return mainHeader.partitionEntriesLBA;} GetSecondPartsLBA(void)169 uint64_t GetSecondPartsLBA(void) {return secondHeader.partitionEntriesLBA;} GetFirstUsableLBA(void)170 uint64_t GetFirstUsableLBA(void) {return mainHeader.firstUsableLBA;} GetLastUsableLBA(void)171 uint64_t GetLastUsableLBA(void) {return mainHeader.lastUsableLBA;} 172 uint32_t CountParts(void); 173 bool ValidPartNum (const uint32_t partNum); 174 const GPTPart & operator[](uint32_t partNum) const; 175 const GUIDData & GetDiskGUID(void) const; GetBlockSize(void)176 uint32_t GetBlockSize(void) {return blockSize;} 177 178 // Find information about free space 179 uint64_t FindFirstAvailable(uint64_t start = 0); 180 uint64_t FindFirstInLargest(void); 181 uint64_t FindLastAvailable(); 182 uint64_t FindLastInFree(uint64_t start); 183 uint64_t FindFreeBlocks(uint32_t *numSegments, uint64_t *largestSegment); 184 int IsFree(uint64_t sector, uint32_t *partNum = NULL); 185 int IsFreePartNum(uint32_t partNum); 186 int IsUsedPartNum(uint32_t partNum); 187 188 // Change how functions work, or return information on same 189 void SetAlignment(uint32_t n); 190 uint32_t ComputeAlignment(void); // Set alignment based on current partitions GetAlignment(void)191 uint32_t GetAlignment(void) {return sectorAlignment;} 192 void JustLooking(int i = 1) {justLooking = i;} TurnOffSyncing()193 void TurnOffSyncing() {syncing = 0;} 194 void BeQuiet(int i = 1) {beQuiet = i;} WhichWasUsed(void)195 WhichToUse WhichWasUsed(void) {return whichWasUsed;} 196 197 // Endianness functions 198 void ReverseHeaderBytes(struct GPTHeader* header); 199 void ReversePartitionBytes(); // for endianness 200 201 // Attributes functions 202 int ManageAttributes(int partNum, const string & command, const string & bits); 203 void ShowAttributes(const uint32_t partNum); 204 void GetAttribute(const uint32_t partNum, const string& attributeBits); 205 206 }; // class GPTData 207 208 // Function prototypes.... 209 int SizesOK(void); 210 211 #endif 212