reactos/freeldr/install/install.c

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/*
* FreeLoader - install.c
*
* Copyright (C) 2001 Brian Palmer <brianp@sginet.com>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include "install.h"
#include "volume.h"
#include "../bootsect/fat.h"
#include "../bootsect/fat32.h"
BOOL BackupBootSector(LPCTSTR lpszVolumeName);
BOOL InstallBootSector(LPCTSTR lpszVolumeType);
int main(int argc, char *argv[])
{
if (argc < 3)
{
_tprintf(_T("syntax: install x: [fs_type]\nwhere fs_type is fat or fat32\n"));
return -1;
}
if (!OpenVolume(argv[1]))
{
return -1;
}
BackupBootSector(argv[1]);
InstallBootSector(argv[2]);
_tprintf(_T("You must now copy freeldr.sys & freeldr.ini to %s.\n"), argv[1]);
CloseVolume();
return 0;
}
BOOL BackupBootSector(LPCTSTR lpszVolumeName)
{
HANDLE hBackupFile;
TCHAR szFileName[MAX_PATH];
ULONG Count;
BYTE BootSectorBuffer[512];
DWORD dwNumberOfBytesWritten;
BOOL bRetVal;
//
// Find the next unused filename and open it
//
for (Count=0; ; Count++)
{
//
// Generate the next filename
//
_stprintf(szFileName, _T("%s\\bootsect.%03d"), lpszVolumeName, Count);
//
// Try to create a new file, fail if exists
//
hBackupFile = CreateFile(szFileName, GENERIC_WRITE, 0, NULL, CREATE_NEW, /*FILE_ATTRIBUTE_SYSTEM*/0, NULL);
//
// Check to see if it worked
//
if (hBackupFile != INVALID_HANDLE_VALUE)
{
break;
}
//
// Nope, didn't work
// Check to see if it already existed
//
if (!(GetLastError() != ERROR_ALREADY_EXISTS))
{
_tprintf(_T("%s:%d: "), __FILE__, __LINE__);
_tprintf(_T("Boot sector backup failed. Error code %d.\n"), GetLastError());
return FALSE;
}
}
//
// Try to read the boot sector
//
if (!ReadVolumeSector(0, BootSectorBuffer))
{
CloseHandle(hBackupFile);
return FALSE;
}
//
// Try to write the boot sector data to the file
//
bRetVal = WriteFile(hBackupFile, BootSectorBuffer, 512, &dwNumberOfBytesWritten, NULL);
if (!bRetVal || (dwNumberOfBytesWritten != 512))
{
CloseHandle(hBackupFile);
_tprintf(_T("%s:%d: "), __FILE__, __LINE__);
_tprintf(_T("WriteFile() failed. Error code %d.\n"), GetLastError());
return FALSE;
}
_tprintf(_T("Boot sector backed up to file: %s\n"), szFileName);
CloseHandle(hBackupFile);
return TRUE;
}
BOOL InstallBootSector(LPCTSTR lpszVolumeType)
{
BYTE BootSectorBuffer[512];
//
// Read in the old boot sector
//
if (!ReadVolumeSector(0, BootSectorBuffer))
{
return FALSE;
}
if (_tcsicmp(lpszVolumeType, _T("fat")) == 0)
{
//
// Update the BPB in the new boot sector
//
memcpy((fat_data+3), (BootSectorBuffer+3), 59 /*fat BPB length*/);
//
// Write out new boot sector
//
if (!WriteVolumeSector(0, fat_data))
{
return FALSE;
}
}
else if (_tcsicmp(lpszVolumeType, _T("fat32")) == 0)
{
//
// Update the BPB in the new boot sector
//
memcpy((fat32_data+3), (BootSectorBuffer+3), 87 /*fat32 BPB length*/);
//
// Write out new boot sector
//
if (!WriteVolumeSector(0, fat32_data))
{
return FALSE;
}
//
// Write out new extra sector
//
if (!WriteVolumeSector(14, (fat_data+512) ))
{
return FALSE;
}
}
else
{
_tprintf(_T("%s:%d: "), __FILE__, __LINE__);
_tprintf(_T("File system type %s unknown.\n"), lpszVolumeType);
return FALSE;
}
_tprintf(_T("%s boot sector installed.\n"), lpszVolumeType);
return TRUE;
}