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 #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); VerifyMBR(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 int SetDisk(const DiskIO & disk); GetDisk(void)116 DiskIO* GetDisk(void) {return &myDisk;} LoadMBR(const string & f)117 int LoadMBR(const string & f) {return protectiveMBR.ReadMBRData(f);} WriteProtectiveMBR(void)118 int WriteProtectiveMBR(void) {return protectiveMBR.WriteMBRData(&myDisk);} 119 void PartitionScan(void); 120 int LoadPartitions(const string & deviceFilename); 121 int ForceLoadGPTData(void); 122 int LoadMainTable(void); 123 int LoadSecondTableAsMain(void); 124 int SaveGPTData(int quiet = 0); 125 int SaveGPTBackup(const string & filename); 126 int LoadGPTBackup(const string & filename); 127 int SaveMBR(void); 128 int DestroyGPT(void); 129 int DestroyMBR(void); 130 131 // Display data.... 132 void ShowAPMState(void); 133 void ShowGPTState(void); 134 void DisplayGPTData(void); DisplayMBRData(void)135 void DisplayMBRData(void) {protectiveMBR.DisplayMBRData();} 136 void ShowPartDetails(uint32_t partNum); 137 138 // Convert between GPT and other formats 139 virtual WhichToUse UseWhichPartitions(void); 140 void XFormPartitions(void); 141 int XFormDisklabel(uint32_t partNum); 142 int XFormDisklabel(BSDData* disklabel); 143 int OnePartToMBR(uint32_t gptPart, int mbrPart); // add one partition to MBR. Returns 1 if successful 144 145 // Adjust GPT structures WITHOUT user interaction... 146 int SetGPTSize(uint32_t numEntries, int fillGPTSectors = 1); 147 int MoveMainTable(uint64_t pteSector); 148 void BlankPartitions(void); 149 int DeletePartition(uint32_t partNum); 150 uint32_t CreatePartition(uint32_t partNum, uint64_t startSector, uint64_t endSector); 151 void SortGPT(void); 152 int SwapPartitions(uint32_t partNum1, uint32_t partNum2); 153 int ClearGPTData(void); 154 void MoveSecondHeaderToEnd(); 155 int SetName(uint32_t partNum, const UnicodeString & theName); 156 void SetDiskGUID(GUIDData newGUID); 157 int SetPartitionGUID(uint32_t pn, GUIDData theGUID); 158 void RandomizeGUIDs(void); 159 int ChangePartType(uint32_t pn, PartType theGUID); MakeProtectiveMBR(void)160 void MakeProtectiveMBR(void) {protectiveMBR.MakeProtectiveMBR();} 161 void RecomputeCHS(void); 162 int Align(uint64_t* sector); SetProtectiveMBR(BasicMBRData & newMBR)163 void SetProtectiveMBR(BasicMBRData & newMBR) {protectiveMBR = newMBR;} 164 165 // Return data about the GPT structures.... GetState(void)166 WhichToUse GetState(void) {return whichWasUsed;} 167 int GetPartRange(uint32_t* low, uint32_t* high); 168 int FindFirstFreePart(void); GetNumParts(void)169 uint32_t GetNumParts(void) {return mainHeader.numParts;} GetTableSizeInSectors(void)170 uint64_t GetTableSizeInSectors(void) {return (((numParts * GPT_SIZE) / blockSize) + 171 (((numParts * GPT_SIZE) % blockSize) != 0)); } GetMainHeaderLBA(void)172 uint64_t GetMainHeaderLBA(void) {return mainHeader.currentLBA;} GetSecondHeaderLBA(void)173 uint64_t GetSecondHeaderLBA(void) {return secondHeader.currentLBA;} GetMainPartsLBA(void)174 uint64_t GetMainPartsLBA(void) {return mainHeader.partitionEntriesLBA;} GetSecondPartsLBA(void)175 uint64_t GetSecondPartsLBA(void) {return secondHeader.partitionEntriesLBA;} GetFirstUsableLBA(void)176 uint64_t GetFirstUsableLBA(void) {return mainHeader.firstUsableLBA;} GetLastUsableLBA(void)177 uint64_t GetLastUsableLBA(void) {return mainHeader.lastUsableLBA;} 178 uint32_t CountParts(void); 179 bool ValidPartNum (const uint32_t partNum); 180 const GPTPart & operator[](uint32_t partNum) const; 181 const GUIDData & GetDiskGUID(void) const; GetBlockSize(void)182 uint32_t GetBlockSize(void) {return blockSize;} 183 184 // Find information about free space 185 uint64_t FindFirstAvailable(uint64_t start = 0); 186 uint64_t FindFirstUsedLBA(void); 187 uint64_t FindFirstInLargest(void); 188 uint64_t FindLastAvailable(); 189 uint64_t FindLastInFree(uint64_t start); 190 uint64_t FindFreeBlocks(uint32_t *numSegments, uint64_t *largestSegment); 191 int IsFree(uint64_t sector, uint32_t *partNum = NULL); 192 int IsFreePartNum(uint32_t partNum); 193 int IsUsedPartNum(uint32_t partNum); 194 195 // Change how functions work, or return information on same 196 void SetAlignment(uint32_t n); 197 uint32_t ComputeAlignment(void); // Set alignment based on current partitions GetAlignment(void)198 uint32_t GetAlignment(void) {return sectorAlignment;} 199 void JustLooking(int i = 1) {justLooking = i;} 200 void BeQuiet(int i = 1) {beQuiet = i;} WhichWasUsed(void)201 WhichToUse WhichWasUsed(void) {return whichWasUsed;} 202 203 // Endianness functions 204 void ReverseHeaderBytes(struct GPTHeader* header); 205 void ReversePartitionBytes(); // for endianness 206 207 // Attributes functions 208 int ManageAttributes(int partNum, const string & command, const string & bits); 209 void ShowAttributes(const uint32_t partNum); 210 void GetAttribute(const uint32_t partNum, const string& attributeBits); 211 212 }; // class GPTData 213 214 // Function prototypes.... 215 int SizesOK(void); 216 217 #endif 218