mirror of
https://github.com/reactos/reactos.git
synced 2024-09-07 03:11:07 +00:00
147 lines
4.8 KiB
C
147 lines
4.8 KiB
C
#include <stdio.h>
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#include <string.h>
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#include "finstext2.h"
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#include "ext2.h" // #defines ext2_data
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#include <linux/hdreg.h>
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#include <linux/ext3_fs.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define MAJOR_VERSION 1
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#define MINOR_VERSION 0
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PEXT2_BOOTCODE Ext2BootCode = (PEXT2_BOOTCODE)ext2_data;
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struct ext3_super_block Ext2SuperBlock;
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struct hd_geometry Ext2DriveGeometry;
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unsigned char Ext2ExistingBootCode[1024];
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char BlockDevice[260];
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int BlockDeviceSpecified = 0;
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int BlockDeviceFileDescriptor;
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int main(int argc, char *argv[])
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{
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int Index;
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char ch;
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// Verify that we got enough command line parameters
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if (argc < 2)
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{
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printf("finstext2 block_device [-v]\n\n");
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printf("block_device Specifies the ext2/3 volume to install to (i.e. /dev/hda1)\n");
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printf("-v Displays the version\n\n");
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}
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// Parse the command line parameters
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for (Index=1; Index<argc; Index++)
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{
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if (strcmp(argv[Index], "-v") == 0)
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{
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printf("FreeLoader Ext2/3 Installer v%d.%d\n", MAJOR_VERSION, MINOR_VERSION);
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}
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else
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{
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strcpy(BlockDevice, argv[Index]);
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BlockDeviceSpecified = 1;
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}
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}
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if (BlockDeviceSpecified)
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{
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BlockDeviceFileDescriptor = open(BlockDevice, O_RDWR|O_SYNC);
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if (BlockDeviceFileDescriptor == -1)
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{
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printf("Couldn't open block device %s\n", BlockDevice);
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return 1;
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}
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if (read(BlockDeviceFileDescriptor, Ext2ExistingBootCode, (size_t)1024) != (ssize_t)1024)
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{
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close(BlockDeviceFileDescriptor);
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printf("Couldn't read existing boot code from %s\n", BlockDevice);
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return 1;
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}
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for (Index=0; Index<1024; Index++)
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{
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if (Ext2ExistingBootCode[Index] != 0x00)
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{
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printf("This EXT2/3 volume has existing boot code.\n");
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printf("Do you want to overwrite it? [y/n] ");
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scanf("%c", &ch);
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if (ch == 'n' || ch == 'N')
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{
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close(BlockDeviceFileDescriptor);
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printf("Cancelled.\n");
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return 0;
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}
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break;
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}
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}
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if (read(BlockDeviceFileDescriptor, &Ext2SuperBlock, (size_t)1024) != (ssize_t)1024)
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{
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close(BlockDeviceFileDescriptor);
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printf("Couldn't read super block from %s\n", BlockDevice);
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return 1;
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}
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if (Ext2SuperBlock.s_magic != EXT3_SUPER_MAGIC)
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{
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close(BlockDeviceFileDescriptor);
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printf("Block device %s is not a EXT2/3 volume or has an invalid super block.\n", BlockDevice);
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return 1;
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}
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if (ioctl(BlockDeviceFileDescriptor, HDIO_GETGEO, &Ext2DriveGeometry) != 0)
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{
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close(BlockDeviceFileDescriptor);
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printf("Couldn't get drive geometry from block device %s\n", BlockDevice);
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return 1;
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}
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printf("Heads: %d\n", Ext2DriveGeometry.heads);
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printf("Sectors: %d\n", Ext2DriveGeometry.sectors);
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printf("Cylinders: %d\n", Ext2DriveGeometry.cylinders);
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printf("Start: %d\n", Ext2DriveGeometry.start);
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Ext2BootCode->BootDrive = 0xff;
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Ext2BootCode->BootPartition = 0x00;
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//Ext2BootCode->SectorsPerTrack = Ext2DriveGeometry.sectors;
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//Ext2BootCode->NumberOfHeads = Ext2DriveGeometry.heads;
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Ext2BootCode->Ext2VolumeStartSector = Ext2DriveGeometry.start;
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Ext2BootCode->Ext2BlockSizeInBytes = 1024 << Ext2SuperBlock.s_log_block_size;
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Ext2BootCode->Ext2BlockSize = Ext2BootCode->Ext2BlockSizeInBytes / 512;
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Ext2BootCode->Ext2PointersPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 4;
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Ext2BootCode->Ext2GroupDescPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 32;
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Ext2BootCode->Ext2FirstDataBlock = Ext2SuperBlock.s_first_data_block;
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Ext2BootCode->Ext2InodesPerGroup = Ext2SuperBlock.s_inodes_per_group;
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Ext2BootCode->Ext2InodesPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 128;
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if (lseek(BlockDeviceFileDescriptor, (off_t)0, SEEK_SET) == (off_t)-1)
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{
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close(BlockDeviceFileDescriptor);
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printf("Couldn't write boot code on %s\n", BlockDevice);
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return 1;
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}
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if (write(BlockDeviceFileDescriptor, Ext2BootCode, (size_t)1024) != (ssize_t)1024)
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{
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close(BlockDeviceFileDescriptor);
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printf("Couldn't write boot code on %s\n", BlockDevice);
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return 1;
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}
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close(BlockDeviceFileDescriptor);
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printf("Boot code written successfully!\n");
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}
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return 0;
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} |