/// <summary> /// Sector refers to physical disk blocks, we can only read complete blocks /// </summary> public byte[] ReadSectorsUnbuffered(long sectorIndex, int sectorCount) { bool releaseHandle; SafeFileHandle handle = VolumeHandlePool.ObtainHandle(m_volumeGuid, FileAccess.Read, ShareMode.ReadWrite, out releaseHandle); if (!handle.IsInvalid) { FileStreamEx stream = new FileStreamEx(handle, FileAccess.Read); byte[] buffer = new byte[m_bytesPerSector * sectorCount]; try { stream.Seek(sectorIndex * m_bytesPerSector, SeekOrigin.Begin); stream.Read(buffer, 0, m_bytesPerSector * sectorCount); } finally { stream.Close(releaseHandle); if (releaseHandle) { VolumeHandlePool.ReleaseHandle(m_volumeGuid); } } return(buffer); } else { // we always release invalid handle VolumeHandlePool.ReleaseHandle(m_volumeGuid); // get error code and throw int errorCode = Marshal.GetLastWin32Error(); string message = String.Format("Can't read sector {0} from volume {1}, Win32 Error: {2}", sectorIndex, m_volumeGuid, errorCode); throw new IOException(message); } }
/// <summary> /// Sector refers to physical disk blocks, we can only read complete blocks /// </summary> public byte[] ReadSectorsUnbuffered(long sectorIndex, int sectorCount) { bool releaseHandle; SafeFileHandle handle = PhysicalDiskHandlePool.ObtainHandle(m_physicalDiskIndex, FileAccess.Read, ShareMode.ReadWrite, out releaseHandle); if (!handle.IsInvalid) { FileStreamEx stream = new FileStreamEx(handle, FileAccess.Read); byte[] buffer = new byte[m_bytesPerSector * sectorCount]; try { stream.Seek(sectorIndex * m_bytesPerSector, SeekOrigin.Begin); stream.Read(buffer, 0, m_bytesPerSector * sectorCount); } finally { stream.Close(releaseHandle); if (releaseHandle) { PhysicalDiskHandlePool.ReleaseHandle(m_physicalDiskIndex); } } return(buffer); } else { // we always release invalid handle PhysicalDiskHandlePool.ReleaseHandle(m_physicalDiskIndex); // get error code and throw int errorCode = Marshal.GetLastWin32Error(); string message = String.Format("Failed to read sector {0} from disk {1}.", sectorIndex, m_physicalDiskIndex); IOExceptionHelper.ThrowIOError(errorCode, message); return(null); // this line will not be reached } }