在STM32上实现NTFS之4：GPT分区表的C语言实现（1）：主GPT表头的实现

 1 #define PDT_GPT 0
 2 
 3 #define PDT_MBR 0
 4 
 5 ...
 6 
 7 bool PartitionTableDetermination(unsigned char* SectorData)
 8 
 9 {
10 
11     if (SectorData[0x1C2] == 0xEE)
12 
13         return PDT_GPT;
14 
15     else
16 
17         return PDT_MBR;
18 
19 }

 1     if (PartitionTableDetermination(SectorBuffer) == PDT_GPT)
 2 
 3     {
 4 
 5         printf("该硬盘是GPT分区表\n");
 6 
 7     }
 8 
 9     else if (PartitionTableDetermination(SectorBuffer) == PDT_MBR)
10 
11     {
12 
13         printf("该硬盘是MBR分区表\n");
14 
15     }

 1 #pragma pack(1)
 2 
 3  typedef struct
 4 
 5 {
 6 
 7     uint8_t EFIPARTSign[8];            //固定字符串“EFI PART”
 8 
 9     uint8_t GPTVersion[4];            //GPT版本号
10 
11     uint8_t PrimaryGPTHeaderLength[4]; //主GPT头大小
12 
13     uint8_t PrimaryGPTHeaderCRC32[4];  //主GPT头的CRC32校验数据
14 
15     uint8_t Reserve[4];                //保留
16 
17     uint8_t PrimaryGPTHeaderStart[8];  //主GPT头起始扇区号
18 
19     uint8_t PrimaryGPTHeaderBackup[8]; //主GPT头备份位置扇区号
20 
21     uint8_t GPTPartitionStart[8];      //GPT分区起始扇区号
22 
23     uint8_t GPTPartitionEnd[8];        //GPT分区结束扇区号
24 
25     uint8_t DiskGUID[16];              //磁盘的GUID
26 
27     uint8_t PartitionStart[8];         //分区表起始扇区号
28 
29     uint8_t PartitionTables[4];        //分区表项数目
30 
31     uint8_t BytesPerPartitionTable[4]; //每个分区表占用字节数
32 
33     uint8_t PartitionTableCRC32[4];    //分区表CRC校验数据
34 
35     uint8_t Reverse2[4];                 //填充数据00
36 
37 }GPT_Byte;
38 
39 #pragma pack()
40 
41 typedef struct
42 
43 {
44 
45     uint8_t  GPTVersion[4];          //GPT版本号
46 
47     uint32_t PrimaryGPTHeaderLength; //主GPT头大小
48 
49     uint32_t PrimaryGPTHeaderCRC32;  //主GPT头的CRC32校验数据
50 
51     uint64_t PrimaryGPTHeaderStart;  //主GPT头起始扇区号
52 
53     uint64_t PrimaryGPTHeaderBackup; //主GPT头备份位置扇区号
54 
55     uint64_t GPTPartitionStart;      //GPT分区起始扇区号
56 
57     uint64_t GPTPartitionEnd;        //GPT分区结束扇区号
58 
59     uint8_t  DiskGUID[16];           //磁盘的GUID
60 
61     uint64_t PartitionStart;         //分区表起始扇区号
62 
63     uint32_t PartitionTables;        //分区表项数目
64 
65     uint32_t BytesPerPartitionTable; //每个分区表占用字节数
66 
67     uint32_t PartitionTableCRC32;    //分区表CRC校验数据
68 
69 }GPT_Info;

 1 void GetGPTInfo(GPT_Info* GPTInfo)
 2 
 3 {
 4 
 5     GPT_Byte GPTbuffer;
 6 
 7     HANDLE hdl = GetDiskHandle(PHYDRIVE);//获取一个指定物理驱动器句柄
 8 
 9     ReadSectorData(hdl, 1, (char*)(void*)&GPTbuffer);
10 
11     GPTInfoTransferLittleEnd(&GPTbuffer, GPTInfo);
12 
13 }
14 
15  
16 
17 void GPTInfoTransferLittleEnd(GPT_Byte* src, GPT_Info* dest)
18 
19 {
20 
21     memcpy(dest->GPTVersion, src->GPTVersion, 4);
22 
23     dest->PrimaryGPTHeaderLength = ArrayToU32LittleEnd(src->PrimaryGPTHeaderLength);
24 
25     dest->PrimaryGPTHeaderCRC32  = ArrayToU32LittleEnd(src->PrimaryGPTHeaderCRC32);
26 
27     dest->PrimaryGPTHeaderStart  = ArrayToU64LittleEnd(src->PrimaryGPTHeaderStart);
28 
29     dest->PrimaryGPTHeaderBackup = ArrayToU64LittleEnd(src->PrimaryGPTHeaderBackup);
30 
31     dest->GPTPartitionStart      = ArrayToU64LittleEnd(src->GPTPartitionStart);
32 
33     dest->GPTPartitionEnd        = ArrayToU64LittleEnd(src->GPTPartitionEnd);
34 
35     memcpy(dest->DiskGUID, src->DiskGUID, 16);
36 
37     dest->PartitionStart         = ArrayToU64LittleEnd(src->PartitionStart);
38 
39     dest->PartitionTables        = ArrayToU32LittleEnd(src->PartitionTables);
40 
41     dest->BytesPerPartitionTable = ArrayToU32LittleEnd(src->PartitionTables);
42 
43     dest->PartitionTableCRC32    = ArrayToU32LittleEnd(src->PartitionTableCRC32);
44 
45 }