/// <summary>
/// Creates a Spectrum compatible floppy file with the specified name
/// </summary>
/// <param name="filename">File name with full pass</param>
/// <returns>The opened floppy file</returns>
public static VirtualFloppyFile OpenFloppyFile(string filename)
{
using (var reader = new BinaryReader(File.OpenRead(filename)))
{
var header = reader.ReadBytes(HEADER.Length);
if (!header.SequenceEqual(HEADER))
{
throw new InvalidOperationException("Invalid floppy file header");
}
var isWriteProtected = reader.ReadByte() != 0x00;
var isDoubleSided = reader.ReadByte() != 0x00;
var tracks = reader.ReadByte();
var sectorsPerTrack = reader.ReadByte();
var firstSector = reader.ReadByte();
var lengthRead = 0;
for (var i = 0; i < (isDoubleSided ? 2 : 1) * tracks * sectorsPerTrack; i++)
{
var sectorData = reader.ReadBytes(512);
lengthRead += sectorData.Length;
if (sectorData.Length < 512)
{
throw new InvalidOperationException(
$"Floppy file is shorter then expected, its size is {lengthRead} bytes.");
}
}
reader.BaseStream.Seek(HEADER_SIZE, SeekOrigin.Begin);
var formatSpec = reader.ReadBytes(10);
var floppy = new VirtualFloppyFile(filename, isWriteProtected, formatSpec, firstSector);
if (!floppy.IsSpectrumVmCompatible())
{
throw new InvalidOperationException("Floppy file is not Spectrum compatible");
}
return(floppy);
}
}
/// <summary>
/// Creates a Spectrum compatible floppy file with the specified name
/// </summary>
/// <param name="filename">File name with full pass</param>
/// <param name="format">Format to create</param>
/// <returns>The newly created floppy file</returns>
public static VirtualFloppyFile CreateSpectrumFloppyFile(string filename, FloppyFormat format = FloppyFormat.SpectrumP3)
{
var dir = Path.GetDirectoryName(filename);
if (dir != null && !Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
using (var writer = new BinaryWriter(File.Create(filename)))
{
if (!s_FormatHeaders.TryGetValue(format, out var formatDesc))
{
formatDesc = s_DefaultFormatDescriptor;
}
var formatBytes = formatDesc.Format;
var floppy = new VirtualFloppyFile(filename, false, formatBytes, formatDesc.SectorIndex);
writer.Write(HEADER);
writer.Write(floppy.IsWriteProtected ? (byte)0x01 : (byte)0x00);
writer.Write(floppy.IsDoubleSided ? (byte)0x01 : (byte)0x00);
writer.Write(floppy.Tracks);
writer.Write(floppy.SectorsPerTrack);
writer.Write(floppy.FirstSectorIndex);
var sectorData = new byte[512];
for (var i = 0; i < sectorData.Length; i++)
{
sectorData[i] = 0xE5;
}
for (var i = 0; i < (floppy.IsDoubleSided ? 2 : 1) * floppy.Tracks * floppy.SectorsPerTrack; i++)
{
writer.Write(sectorData);
}
writer.Seek(HEADER_SIZE, SeekOrigin.Begin);
writer.Write(formatBytes);
return(floppy);
}
}