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Advanced settings FAT modification: add GPT partition support

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This commit is contained in:
Floris Bos 2022-11-20 14:46:58 +01:00
parent 05f1c4dbb5
commit d600f36bc4
2 changed files with 49 additions and 2 deletions
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17
src/devicewrapper.cpp
View file

@ -161,6 +161,23 @@ DeviceWrapperFatPartition *DeviceWrapper::fatPartition(int nr)
if (nr > 4 || nr < 1)
throw std::runtime_error("Only basic partitions 1-4 supported");
/* GPT table handling */
struct gpt_header gpt;
struct gpt_partition gptpart;
pread((char *) &gpt, sizeof(gpt), 512);
if (!strcmp("EFI PART", gpt.Signature) && gpt.MyLBA == 1)
{
qDebug() << "Using GPT partition table";
if (nr > gpt.NumberOfPartitionEntries)
throw std::runtime_error("Partition does not exist");
pread((char *) &gptpart, sizeof(gptpart), gpt.PartitionEntryLBA*512 + gpt.SizeOfPartitionEntry*(nr-1));
return new DeviceWrapperFatPartition(this, gptpart.StartingLBA*512, (gptpart.EndingLBA-gptpart.StartingLBA+1)*512, this);
}
/* MBR table handling */
struct mbr_table mbr;
pread((char *) &mbr, sizeof(mbr), 0);

34
src/devicewrapperstructs.h
View file

@ -17,8 +17,8 @@ struct mbr_partition_entry {
char begin_hsc[3];
unsigned char id;
char end_hsc[3];
unsigned int starting_sector;
unsigned int nr_of_sectors;
uint32_t starting_sector;
uint32_t nr_of_sectors;
};
struct mbr_table {
@ -29,6 +29,36 @@ struct mbr_table {
unsigned char signature[2];
};
/* GUID on-disk structures
* https://www.intel.com/content/dam/www/public/us/en/zip/efi-110.zip (p. 369)
*/
struct gpt_header {
char Signature[8];
uint32_t Revision;
uint32_t HeaderSize;
uint32_t HeaderCRC32;
uint32_t Reserved;
uint64_t MyLBA;
uint64_t AlternateLBA;
uint64_t FirstUsableLBA;
uint64_t LastUsableLBA;
unsigned char DiskGUID[16];
uint64_t PartitionEntryLBA;
uint32_t NumberOfPartitionEntries;
uint32_t SizeOfPartitionEntry;
uint32_t PartitionEntryArrayCRC32;
char Reserved2[420]; /* Assuming 512 byte sectors */
};
struct gpt_partition {
unsigned char PartitionTypeGuid[16];
unsigned char UniquePartitionGuid[16];
uint64_t StartingLBA;
uint64_t EndingLBA;
uint64_t Attributes;
char PartitionName[72];
};
/* File Allocation Table
* https://academy.cba.mit.edu/classes/networking_communications/SD/FAT.pdf