public Atari8bit_disk(Stream DataStream, IDumpConverter Converter) : base(DataStream, Converter)
{
if (Converter == null)
{
this.Datastream = Datastream;
}
else
{
this.Datastream = Converter.Normalize(DataStream);
}
this.Volumes = new Volume[1];
this.Volumes[0] = new Volume();
this.Volumes[0].Root = new Directory();
// check for the VTOC location first, to confirm if single or double density
if (this.Datastream.Length < 0xb380)
{
// file isn't even long enough to look for the VTOC
// set an empty root directory and get outta here
this.Density = DensityType.Unknown;
return;
}
this.Datastream.Seek(0xb381, SeekOrigin.Begin);
if (this.Datastream.ReadByte() == 0xc3 && this.Datastream.ReadByte() == 2)
{
//most likely found the VTOC
this.Density = DensityType.Single;
this.Volumes[0].UnitSize = 128;
}
else
{
this.Datastream.Seek(0x16801, SeekOrigin.Begin);
if (this.Datastream.ReadByte() == 0xc3 && this.Datastream.ReadByte() == 2)
{
//most likely found the VTOC
this.Density = DensityType.Double;
this.Volumes[0].UnitSize = 256;
}
else
{
// non-standard format or not an Atari disk
// set an empty root directory and get outta here
this.Density = DensityType.Unknown;
return;
}
}
//our bearings our set, get the file list
this.Datastream.Seek(360 * this.Volumes[0].UnitSize, SeekOrigin.Begin);
int x = 0;
byte[] buffer = new byte[16];
byte[] temp = new byte[2];
List <File> files = new List <File>();
// max of 64 file entries
while (x < 64)
{
this.Datastream.Read(buffer, 0, 16);
if (buffer[0] == 0)
{
break;
}
var newfile = new AtariFile();
newfile.Flags = buffer[0];
// get sector count
Buffer.BlockCopy(buffer, 1, temp, 0, 2);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(temp);
}
newfile.Length = (ulong)BitConverter.ToInt16(temp, 0);
// get sector start
Buffer.BlockCopy(buffer, 3, temp, 0, 2);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(temp);
}
newfile.Start = (ulong)BitConverter.ToInt16(temp, 0);
newfile.Name = Encoding.ASCII.GetString(buffer, 5, 8).Trim() + "." + Encoding.ASCII.GetString(buffer, 13, 3);
files.Add(newfile);
x++;
}
Volumes[0].Root.Contents = files.ToArray();
}
public Atari8bit_disk(Stream DataStream, IDumpConverter Converter)
: base(DataStream, Converter)
{
if (Converter == null) this.Datastream = Datastream;
else this.Datastream = Converter.Normalize(DataStream);
this.Volumes = new Volume[1];
this.Volumes[0] = new Volume();
this.Volumes[0].Root = new Directory();
// check for the VTOC location first, to confirm if single or double density
if (this.Datastream.Length < 0xb380)
{
// file isn't even long enough to look for the VTOC
// set an empty root directory and get outta here
this.Density = DensityType.Unknown;
return;
}
this.Datastream.Seek(0xb381, SeekOrigin.Begin);
if (this.Datastream.ReadByte() == 0xc3 && this.Datastream.ReadByte() == 2)
{
//most likely found the VTOC
this.Density = DensityType.Single;
this.Volumes[0].UnitSize = 128;
}
else
{
this.Datastream.Seek(0x16801, SeekOrigin.Begin);
if (this.Datastream.ReadByte() == 0xc3 && this.Datastream.ReadByte() == 2)
{
//most likely found the VTOC
this.Density = DensityType.Double;
this.Volumes[0].UnitSize = 256;
}
else
{
// non-standard format or not an Atari disk
// set an empty root directory and get outta here
this.Density = DensityType.Unknown;
return;
}
}
//our bearings our set, get the file list
this.Datastream.Seek(360 * this.Volumes[0].UnitSize, SeekOrigin.Begin);
int x = 0;
byte[] buffer = new byte[16];
byte[] temp = new byte[2];
List<File> files = new List<File>();
// max of 64 file entries
while (x < 64)
{
this.Datastream.Read(buffer, 0, 16);
if (buffer[0] == 0) break;
var newfile = new AtariFile();
newfile.Flags = buffer[0];
// get sector count
Buffer.BlockCopy(buffer, 1, temp, 0, 2);
if (!BitConverter.IsLittleEndian) Array.Reverse(temp);
newfile.Length = (ulong)BitConverter.ToInt16(temp, 0);
// get sector start
Buffer.BlockCopy(buffer, 3, temp, 0, 2);
if (!BitConverter.IsLittleEndian) Array.Reverse(temp);
newfile.Start = (ulong)BitConverter.ToInt16(temp, 0);
newfile.Name = Encoding.ASCII.GetString(buffer, 5, 8).Trim() + "." + Encoding.ASCII.GetString(buffer, 13, 3);
files.Add(newfile);
x++;
}
Volumes[0].Root.Contents = files.ToArray();
}
