public static string PrettifyDensity(DensitySupportHeader?density)
{
if (density == null)
{
return(null);
}
DensitySupportHeader decoded = density.Value;
var sb = new StringBuilder();
foreach (DensitySupportDescriptor descriptor in decoded.descriptors)
{
sb.AppendFormat("Density \"{0}\" defined by \"{1}\".", descriptor.name, descriptor.organization).
AppendLine();
sb.AppendFormat("\tPrimary code: {0:X2}h", descriptor.primaryCode).AppendLine();
if (descriptor.primaryCode != descriptor.secondaryCode)
{
sb.AppendFormat("\tSecondary code: {0:X2}h", descriptor.secondaryCode).AppendLine();
}
if (descriptor.writable)
{
sb.AppendLine("\tDrive can write this density");
}
if (descriptor.duplicate)
{
sb.AppendLine("\tThis descriptor is duplicated");
}
if (descriptor.defaultDensity)
{
sb.AppendLine("\tThis is the default density on the drive");
}
sb.AppendFormat("\tDensity has {0} bits per mm, with {1} tracks in a {2} mm width tape",
descriptor.bpmm, descriptor.tracks, descriptor.width / (double)10).AppendLine();
sb.AppendFormat("\tDensity maximum capacity is {0} megabytes", descriptor.capacity).AppendLine();
sb.AppendFormat("\tDensity description: {0}", descriptor.description).AppendLine();
sb.AppendLine();
}
return(sb.ToString());
}
public static DensitySupportHeader?DecodeDensity(byte[] response)
{
if (response == null)
{
return(null);
}
if (response.Length <= 56)
{
return(null);
}
ushort responseLen = (ushort)((response[0] << 8) + response[1] + 2);
if (response.Length != responseLen)
{
return(null);
}
List <DensitySupportDescriptor> descriptors = new List <DensitySupportDescriptor>();
int offset = 4;
while (offset < response.Length)
{
var descriptor = new DensitySupportDescriptor
{
primaryCode = response[offset + 0],
secondaryCode = response[offset + 1],
writable = (response[offset + 2] & 0x80) == 0x80,
duplicate = (response[offset + 2] & 0x40) == 0x40,
defaultDensity = (response[offset + 2] & 0x20) == 0x20,
reserved = (byte)((response[offset + 2] & 0x1E) >> 1),
lenvalid = (response[offset + 2] & 0x01) == 0x01,
len = (ushort)((response[offset + 3] << 8) + response[offset + 4]),
bpmm = (uint)((response[offset + 5] << 16) + (response[offset + 6] << 8) + response[offset + 7]),
width = (ushort)((response[offset + 8] << 8) + response[offset + 9]),
tracks = (ushort)((response[offset + 10] << 8) + response[offset + 11]),
capacity = (uint)((response[offset + 12] << 24) + (response[offset + 13] << 16) +
(response[offset + 14] << 8) + response[offset + 15])
};
byte[] tmp = new byte[8];
Array.Copy(response, offset + 16, tmp, 0, 8);
descriptor.organization = StringHandlers.CToString(tmp).Trim();
tmp = new byte[8];
Array.Copy(response, offset + 24, tmp, 0, 8);
descriptor.name = StringHandlers.CToString(tmp).Trim();
tmp = new byte[20];
Array.Copy(response, offset + 32, tmp, 0, 20);
descriptor.description = StringHandlers.CToString(tmp).Trim();
if (descriptor.lenvalid)
{
offset += descriptor.len + 5;
}
else
{
offset += 52;
}
descriptors.Add(descriptor);
}
var decoded = new DensitySupportHeader
{
length = responseLen,
reserved = (ushort)((response[2] << 8) + response[3] + 2),
descriptors = descriptors.ToArray()
};
return(decoded);
}
