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135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*
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* FreeLoader - volume.c
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*
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* Copyright (C) 2001 Brian Palmer <brianp@sginet.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <windows.h>
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#include <stdio.h>
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#include <tchar.h>
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#include "volume.h"
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static HANDLE hDiskVolume = NULL;
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BOOL OpenVolume(LPCTSTR lpszVolumeName)
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{
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TCHAR RealVolumeName[MAX_PATH];
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//
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// If they passed in a drive letter (e.g. "A:")
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// then try to open the physical device volume,
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// otherwise we will assume it is a disk image
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// file they are writing to. (not fully supported yet)
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//
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if ((_tcslen(lpszVolumeName) == 2) && (lpszVolumeName[1] == _T(':')))
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{
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_tcscpy(RealVolumeName, _T("\\\\.\\"));
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_tcscat(RealVolumeName, lpszVolumeName);
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}
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else
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{
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_tcscpy(RealVolumeName, lpszVolumeName);
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}
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_tprintf(_T("Opening volume \'%s\'\n"), lpszVolumeName);
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hDiskVolume = CreateFile(RealVolumeName,
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GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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0,
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NULL);
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if (hDiskVolume == INVALID_HANDLE_VALUE)
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{
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_tprintf(_T("%s:%d: "), __FILE__, __LINE__);
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_tprintf(_T("Failed. Error code %ld.\n"), GetLastError());
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return FALSE;
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}
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return TRUE;
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}
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void CloseVolume(void)
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{
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CloseHandle(hDiskVolume);
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}
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BOOL ReadVolumeSector(ULONG SectorNumber, PVOID SectorBuffer)
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{
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DWORD dwNumberOfBytesRead;
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DWORD dwFilePosition;
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BOOL bRetVal;
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//
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// FIXME: this doesn't seem to handle the situation
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// properly when SectorNumber is bigger than the
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// amount of sectors on the disk. Seems to me that
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// the call to SetFilePointer() should just give an
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// out of bounds error or something but it doesn't.
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//
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dwFilePosition = SetFilePointer(hDiskVolume, (SectorNumber * 512), NULL, FILE_BEGIN);
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if (dwFilePosition != (SectorNumber * 512))
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{
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_tprintf(_T("%s:%d: "), __FILE__, __LINE__);
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_tprintf(_T("SetFilePointer() failed. Error code %ld.\n"), GetLastError());
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return FALSE;
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}
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bRetVal = ReadFile(hDiskVolume, SectorBuffer, 512, &dwNumberOfBytesRead, NULL);
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if (!bRetVal || (dwNumberOfBytesRead != 512))
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{
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_tprintf(_T("%s:%d: "), __FILE__, __LINE__);
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_tprintf(_T("ReadFile() failed. Error code %ld.\n"), GetLastError());
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return FALSE;
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}
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return TRUE;
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}
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BOOL WriteVolumeSector(ULONG SectorNumber, PVOID SectorBuffer)
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{
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DWORD dwNumberOfBytesWritten;
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DWORD dwFilePosition;
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BOOL bRetVal;
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//
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// FIXME: this doesn't seem to handle the situation
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// properly when SectorNumber is bigger than the
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// amount of sectors on the disk. Seems to me that
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// the call to SetFilePointer() should just give an
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// out of bounds error or something but it doesn't.
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//
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dwFilePosition = SetFilePointer(hDiskVolume, (SectorNumber * 512), NULL, FILE_BEGIN);
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if (dwFilePosition != (SectorNumber * 512))
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{
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_tprintf(_T("%s:%d: "), __FILE__, __LINE__);
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_tprintf(_T("SetFilePointer() failed. Error code %ld.\n"), GetLastError());
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return FALSE;
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}
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bRetVal = WriteFile(hDiskVolume, SectorBuffer, 512, &dwNumberOfBytesWritten, NULL);
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if (!bRetVal || (dwNumberOfBytesWritten != 512))
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{
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_tprintf(_T("%s:%d: "), __FILE__, __LINE__);
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_tprintf(_T("WriteFile() failed. Error code %ld.\n"), GetLastError());
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return FALSE;
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}
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return TRUE;
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}
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