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Ventoy/vtoygpt/vtoygpt.c

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/******************************************************************************
* vtoygpt.c ---- ventoy gpt util
*
* Copyright (c) 2020, longpanda <admin@ventoy.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <linux/fs.h>
#include <dirent.h>
#define VOID void
#define CHAR char
#define UINT64 unsigned long long
#define UINT32 unsigned int
#define UINT16 unsigned short
#define CHAR16 unsigned short
#define UINT8 unsigned char
UINT32 VtoyCrc32(VOID *Buffer, UINT32 Length);
#define COMPILE_ASSERT(expr) extern char __compile_assert[(expr) ? 1 : -1]
#pragma pack(1)
typedef struct PART_TABLE
{
UINT8 Active;
UINT8 StartHead;
UINT16 StartSector : 6;
UINT16 StartCylinder : 10;
UINT8 FsFlag;
UINT8 EndHead;
UINT16 EndSector : 6;
UINT16 EndCylinder : 10;
UINT32 StartSectorId;
UINT32 SectorCount;
}PART_TABLE;
typedef struct MBR_HEAD
{
UINT8 BootCode[446];
PART_TABLE PartTbl[4];
UINT8 Byte55;
UINT8 ByteAA;
}MBR_HEAD;
typedef struct GUID
{
UINT32 data1;
UINT16 data2;
UINT16 data3;
UINT8 data4[8];
}GUID;
typedef struct VTOY_GPT_HDR
{
CHAR Signature[8]; /* EFI PART */
UINT8 Version[4];
UINT32 Length;
UINT32 Crc;
UINT8 Reserved1[4];
UINT64 EfiStartLBA;
UINT64 EfiBackupLBA;
UINT64 PartAreaStartLBA;
UINT64 PartAreaEndLBA;
GUID DiskGuid;
UINT64 PartTblStartLBA;
UINT32 PartTblTotNum;
UINT32 PartTblEntryLen;
UINT32 PartTblCrc;
UINT8 Reserved2[420];
}VTOY_GPT_HDR;
COMPILE_ASSERT(sizeof(VTOY_GPT_HDR) == 512);
typedef struct VTOY_GPT_PART_TBL
{
GUID PartType;
GUID PartGuid;
UINT64 StartLBA;
UINT64 LastLBA;
UINT64 Attr;
CHAR16 Name[36];
}VTOY_GPT_PART_TBL;
COMPILE_ASSERT(sizeof(VTOY_GPT_PART_TBL) == 128);
typedef struct VTOY_GPT_INFO
{
MBR_HEAD MBR;
VTOY_GPT_HDR Head;
VTOY_GPT_PART_TBL PartTbl[128];
}VTOY_GPT_INFO;
typedef struct VTOY_BK_GPT_INFO
{
VTOY_GPT_PART_TBL PartTbl[128];
VTOY_GPT_HDR Head;
}VTOY_BK_GPT_INFO;
COMPILE_ASSERT(sizeof(VTOY_GPT_INFO) == 512 * 34);
COMPILE_ASSERT(sizeof(VTOY_BK_GPT_INFO) == 512 * 33);
#pragma pack()
void DumpGuid(const char *prefix, GUID *guid)
{
printf("%s: %08x-%04x-%04x-%02x-%02x-%02x-%02x-%02x-%02x-%02x-%02x\n",
prefix,
guid->data1, guid->data2, guid->data3,
guid->data4[0], guid->data4[1], guid->data4[2], guid->data4[3],
guid->data4[4], guid->data4[5], guid->data4[6], guid->data4[7]
);
}
void DumpHead(VTOY_GPT_HDR *pHead)
{
UINT32 CrcRead;
UINT32 CrcCalc;
printf("Signature:<%s>\n", pHead->Signature);
printf("Version:<%02x %02x %02x %02x>\n", pHead->Version[0], pHead->Version[1], pHead->Version[2], pHead->Version[3]);
printf("Length:%u\n", pHead->Length);
printf("Crc:0x%08x\n", pHead->Crc);
printf("EfiStartLBA:%lu\n", pHead->EfiStartLBA);
printf("EfiBackupLBA:%lu\n", pHead->EfiBackupLBA);
printf("PartAreaStartLBA:%lu\n", pHead->PartAreaStartLBA);
printf("PartAreaEndLBA:%lu\n", pHead->PartAreaEndLBA);
DumpGuid("DiskGuid", &pHead->DiskGuid);
printf("PartTblStartLBA:%lu\n", pHead->PartTblStartLBA);
printf("PartTblTotNum:%u\n", pHead->PartTblTotNum);
printf("PartTblEntryLen:%u\n", pHead->PartTblEntryLen);
printf("PartTblCrc:0x%08x\n", pHead->PartTblCrc);
CrcRead = pHead->Crc;
pHead->Crc = 0;
CrcCalc = VtoyCrc32(pHead, pHead->Length);
if (CrcCalc != CrcRead)
{
printf("Head CRC Check Failed\n");
}
else
{
printf("Head CRC Check SUCCESS [%x] [%x]\n", CrcCalc, CrcRead);
}
CrcRead = pHead->PartTblCrc;
CrcCalc = VtoyCrc32(pHead + 1, pHead->PartTblEntryLen * pHead->PartTblTotNum);
if (CrcCalc != CrcRead)
{
printf("Part Table CRC Check Failed\n");
}
else
{
printf("Part Table CRC Check SUCCESS [%x] [%x]\n", CrcCalc, CrcRead);
}
}
void DumpPartTable(VTOY_GPT_PART_TBL *Tbl)
{
int i;
DumpGuid("PartType", &Tbl->PartType);
DumpGuid("PartGuid", &Tbl->PartGuid);
printf("StartLBA:%lu\n", Tbl->StartLBA);
printf("LastLBA:%lu\n", Tbl->LastLBA);
printf("Attr:0x%lx\n", Tbl->Attr);
printf("Name:");
for (i = 0; i < 36 && Tbl->Name[i]; i++)
{
printf("%c", (CHAR)(Tbl->Name[i]));
}
printf("\n");
}
void DumpMBR(MBR_HEAD *pMBR)
{
int i;
for (i = 0; i < 4; i++)
{
printf("=========== Partition Table %d ============\n", i + 1);
printf("PartTbl.Active = 0x%x\n", pMBR->PartTbl[i].Active);
printf("PartTbl.FsFlag = 0x%x\n", pMBR->PartTbl[i].FsFlag);
printf("PartTbl.StartSectorId = %u\n", pMBR->PartTbl[i].StartSectorId);
printf("PartTbl.SectorCount = %u\n", pMBR->PartTbl[i].SectorCount);
printf("PartTbl.StartHead = %u\n", pMBR->PartTbl[i].StartHead);
printf("PartTbl.StartSector = %u\n", pMBR->PartTbl[i].StartSector);
printf("PartTbl.StartCylinder = %u\n", pMBR->PartTbl[i].StartCylinder);
printf("PartTbl.EndHead = %u\n", pMBR->PartTbl[i].EndHead);
printf("PartTbl.EndSector = %u\n", pMBR->PartTbl[i].EndSector);
printf("PartTbl.EndCylinder = %u\n", pMBR->PartTbl[i].EndCylinder);
}
}
int DumpGptInfo(VTOY_GPT_INFO *pGptInfo)
{
int i;
DumpMBR(&pGptInfo->MBR);
DumpHead(&pGptInfo->Head);
for (i = 0; i < 128; i++)
{
if (pGptInfo->PartTbl[i].StartLBA == 0)
{
break;
}
printf("=====Part %d=====\n", i);
DumpPartTable(pGptInfo->PartTbl + i);
}
return 0;
}
#define VENTOY_EFI_PART_ATTR 0xC000000000000001ULL
int main(int argc, const char **argv)
{
int i;
int fd;
UINT64 DiskSize;
CHAR16 *Name = NULL;
VTOY_GPT_INFO *pMainGptInfo = NULL;
VTOY_BK_GPT_INFO *pBackGptInfo = NULL;
if (argc != 3)
{
printf("usage: vtoygpt -f /dev/sdb\n");
return 1;
}
fd = open(argv[2], O_RDWR);
if (fd < 0)
{
printf("Failed to open %s\n", argv[2]);
return 1;
}
pMainGptInfo = malloc(sizeof(VTOY_GPT_INFO));
pBackGptInfo = malloc(sizeof(VTOY_BK_GPT_INFO));
if (NULL == pMainGptInfo || NULL == pBackGptInfo)
{
close(fd);
return 1;
}
read(fd, pMainGptInfo, sizeof(VTOY_GPT_INFO));
if (argv[1][0] == '-' && argv[1][1] == 'd')
{
DumpGptInfo(pMainGptInfo);
}
else
{
DiskSize = lseek(fd, 0, SEEK_END);
lseek(fd, DiskSize - 33 * 512, SEEK_SET);
read(fd, pBackGptInfo, sizeof(VTOY_BK_GPT_INFO));
Name = pMainGptInfo->PartTbl[1].Name;
if (Name[0] == 'V' && Name[1] == 'T' && Name[2] == 'O' && Name[3] == 'Y')
{
pMainGptInfo->PartTbl[1].Attr = VENTOY_EFI_PART_ATTR;
pMainGptInfo->Head.PartTblCrc = VtoyCrc32(pMainGptInfo->PartTbl, sizeof(pMainGptInfo->PartTbl));
pMainGptInfo->Head.Crc = 0;
pMainGptInfo->Head.Crc = VtoyCrc32(&pMainGptInfo->Head, pMainGptInfo->Head.Length);
pBackGptInfo->PartTbl[1].Attr = VENTOY_EFI_PART_ATTR;
pBackGptInfo->Head.PartTblCrc = VtoyCrc32(pBackGptInfo->PartTbl, sizeof(pBackGptInfo->PartTbl));
pBackGptInfo->Head.Crc = 0;
pBackGptInfo->Head.Crc = VtoyCrc32(&pBackGptInfo->Head, pBackGptInfo->Head.Length);
lseek(fd, 512, SEEK_SET);
write(fd, (UINT8 *)pMainGptInfo + 512, sizeof(VTOY_GPT_INFO) - 512);
lseek(fd, DiskSize - 33 * 512, SEEK_SET);
write(fd, pBackGptInfo, sizeof(VTOY_BK_GPT_INFO));
fsync(fd);
}
}
free(pMainGptInfo);
free(pBackGptInfo);
close(fd);
return 0;
}
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