reactos/freeldr/install/linux/finstext2.c

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#include <stdio.h>
#include <string.h>
#include "finstext2.h"
#include "ext2.h" // #defines ext2_data
#include <linux/hdreg.h>
#include <linux/ext3_fs.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define MAJOR_VERSION 1
#define MINOR_VERSION 0
PEXT2_BOOTCODE Ext2BootCode = (PEXT2_BOOTCODE)ext2_data;
struct ext3_super_block Ext2SuperBlock;
struct hd_geometry Ext2DriveGeometry;
unsigned char Ext2ExistingBootCode[1024];
char BlockDevice[260];
int BlockDeviceSpecified = 0;
int BlockDeviceFileDescriptor;
int main(int argc, char *argv[])
{
int Index;
char ch;
// Verify that we got enough command line parameters
if (argc < 2)
{
printf("finstext2 block_device [-v]\n\n");
printf("block_device Specifies the ext2/3 volume to install to (i.e. /dev/hda1)\n");
printf("-v Displays the version\n\n");
}
// Parse the command line parameters
for (Index=1; Index<argc; Index++)
{
if (strcmp(argv[Index], "-v") == 0)
{
printf("FreeLoader Ext2/3 Installer v%d.%d\n", MAJOR_VERSION, MINOR_VERSION);
}
else
{
strcpy(BlockDevice, argv[Index]);
BlockDeviceSpecified = 1;
}
}
if (BlockDeviceSpecified)
{
BlockDeviceFileDescriptor = open(BlockDevice, O_RDWR|O_SYNC);
if (BlockDeviceFileDescriptor == -1)
{
printf("Couldn't open block device %s\n", BlockDevice);
return 1;
}
if (read(BlockDeviceFileDescriptor, Ext2ExistingBootCode, (size_t)1024) != (ssize_t)1024)
{
close(BlockDeviceFileDescriptor);
printf("Couldn't read existing boot code from %s\n", BlockDevice);
return 1;
}
for (Index=0; Index<1024; Index++)
{
if (Ext2ExistingBootCode[Index] != 0x00)
{
printf("This EXT2/3 volume has existing boot code.\n");
printf("Do you want to overwrite it? [y/n] ");
scanf("%c", &ch);
if (ch == 'n' || ch == 'N')
{
close(BlockDeviceFileDescriptor);
printf("Cancelled.\n");
return 0;
}
break;
}
}
if (read(BlockDeviceFileDescriptor, &Ext2SuperBlock, (size_t)1024) != (ssize_t)1024)
{
close(BlockDeviceFileDescriptor);
printf("Couldn't read super block from %s\n", BlockDevice);
return 1;
}
if (Ext2SuperBlock.s_magic != EXT3_SUPER_MAGIC)
{
close(BlockDeviceFileDescriptor);
printf("Block device %s is not a EXT2/3 volume or has an invalid super block.\n", BlockDevice);
return 1;
}
if (ioctl(BlockDeviceFileDescriptor, HDIO_GETGEO, &Ext2DriveGeometry) != 0)
{
close(BlockDeviceFileDescriptor);
printf("Couldn't get drive geometry from block device %s\n", BlockDevice);
return 1;
}
printf("Heads: %d\n", Ext2DriveGeometry.heads);
printf("Sectors: %d\n", Ext2DriveGeometry.sectors);
printf("Cylinders: %d\n", Ext2DriveGeometry.cylinders);
printf("Start: %d\n", Ext2DriveGeometry.start);
Ext2BootCode->BootDrive = 0x80;
Ext2BootCode->BootPartition = 0x05;
//Ext2BootCode->SectorsPerTrack = Ext2DriveGeometry.sectors;
//Ext2BootCode->NumberOfHeads = Ext2DriveGeometry.heads;
Ext2BootCode->Ext2VolumeStartSector = Ext2DriveGeometry.start;
Ext2BootCode->Ext2BlockSizeInBytes = 1024 << Ext2SuperBlock.s_log_block_size;
Ext2BootCode->Ext2BlockSize = Ext2BootCode->Ext2BlockSizeInBytes / 512;
Ext2BootCode->Ext2PointersPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 4;
Ext2BootCode->Ext2GroupDescPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 32;
Ext2BootCode->Ext2FirstDataBlock = Ext2SuperBlock.s_first_data_block;
Ext2BootCode->Ext2InodesPerGroup = Ext2SuperBlock.s_inodes_per_group;
Ext2BootCode->Ext2InodesPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 128;
if (lseek(BlockDeviceFileDescriptor, (off_t)0, SEEK_SET) == (off_t)-1)
{
close(BlockDeviceFileDescriptor);
printf("Couldn't write boot code on %s\n", BlockDevice);
return 1;
}
if (write(BlockDeviceFileDescriptor, Ext2BootCode, (size_t)1024) != (ssize_t)1024)
{
close(BlockDeviceFileDescriptor);
printf("Couldn't write boot code on %s\n", BlockDevice);
return 1;
}
close(BlockDeviceFileDescriptor);
printf("Boot code written successfully!\n");
}
return 0;
}