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