} // "td"
public static TD0_MAIN_HEADER Deserialize(Stream stream)
{
TD0_MAIN_HEADER result = new TD0_MAIN_HEADER();
stream.Read(result._buffer, 0, result._buffer.Length);
ushort ID = getUInt16(result._buffer, 0);
if (ID != 0x4454 && ID != 0x6474) // "TD"/"td"
{
Logger.Error("TD0 loader: Invalid header ID");
Locator.Resolve <IUserMessage>()
.Error("TD0 loader\n\nInvalid header ID");
return(null);
}
ushort crc = CrcTd0.Calculate(result._buffer, 0, result._buffer.Length - 2);
ushort stampcrc = getUInt16(result._buffer, 0xA);
if (stampcrc != crc)
{
Logger.Warn("TD0 loader: Main header had bad CRC=0x" + crc.ToString("X4") + " (stamp crc=0x" + stampcrc.ToString("X4") + ")");
Locator.Resolve <IUserMessage>()
.Warning("TD0 loader\n\nWrong main header CRC");
}
return(result);
}
public static TD0_SECTOR Deserialize(Stream stream)
{
var sector = new TD0_SECTOR();
// C,H,R,N,Flags,hdrcrc low,hdrcrc high
var adm = new byte[6];
stream.Read(adm, 0, 6);
sector._admark = adm;
// data size low, data size high, encoding method, rawdata,...
var datahdr = new byte[2];
stream.Read(datahdr, 0, 2);
var rawdata = new byte[getUInt16(datahdr, 0)];
stream.Read(rawdata, 0, rawdata.Length);
sector._data = unpackData(rawdata);
var crc = CrcTd0.Calculate(sector._data, 0, sector._data.Length);
if (adm[5] != (crc & 0xFF))
{
Logger.Warn(
"TD0 loader: Sector data had bad CRC=0x{0:X4} (stamp crc=0x{1:X2}) [C:{2:X2};H:{3:X2};R:{4:X2};N:{5:X2}",
crc,
adm[5],
sector.C,
sector.H,
sector.R,
sector.N);
Locator.Resolve <IUserMessage>()
.Warning("TD0 loader\n\nSector data had bad CRC");
}
sector.SetAdCrc(true);
sector.SetDataCrc((sector.Td0Flags & SectorFlags.BadCrc) == 0);
return(sector);
}
public static TD0_TRACK Deserialize(Stream stream)
{
var hdr = new TD0_TRACK();
stream.Read(hdr._rawData, 0, 4);
if (hdr._rawData[0] != 0xFF) // 0xFF - terminator
{
var crc = CrcTd0.Calculate(hdr._rawData, 0, 3);
if (hdr._rawData[3] != (crc & 0xFF))
{
Logger.Warn("TD0 loader: Track header had bad CRC=0x" + crc.ToString("X4") + " (stamp crc=0x" + hdr._rawData[3].ToString("X2") + ") [CYL:0x" + hdr._rawData[1].ToString("X2") + ";SIDE:" + hdr._rawData[2].ToString("X2"));
Locator.Resolve <IUserMessage>()
.Warning("TD0 loader\n\nTrack header had bad CRC");
}
var sectors = new List <Sector>(hdr.SectorCount);
for (int s = 0; s < hdr.SectorCount; s++)
{
hdr._sectorList.Add(TD0_SECTOR.Deserialize(stream));
}
}
return(hdr);
}
private bool loadData(Stream stream)
{
var mainHdr = TD0_MAIN_HEADER.Deserialize(stream);
if (mainHdr == null)
{
return(false);
}
if (mainHdr.Ver > 21 || mainHdr.Ver < 10) // 1.0 <= version <= 2.1...
{
Locator.Resolve <IUserMessage>()
.Error("TD0 loader\n\nFormat version is not supported [0x{0:X2}]", mainHdr.Ver);
return(false);
}
if (mainHdr.DataDOS != 0)
{
Locator.Resolve <IUserMessage>()
.Error("TD0 loader\n\n'DOS Allocated sectors were copied' is not supported!");
return(false);
}
var dataStream = stream;
if (mainHdr.IsAdvandcedCompression)
{
if (mainHdr.Ver < 20) // unsupported Old Advanced compression
{
Locator.Resolve <IUserMessage>()
.Error("TD0 loader\n\nOld Advanced compression is not implemented!");
return(false);
}
dataStream = new LzssHuffmanStream(stream);
}
#region debug info
//string state = "Main header loaded, ";
//if (dataStream is LzssHuffmanStream)
// state += "compressed+";
//else
// state += "compressed-";
//state += ", ";
//if ((mainHdr.Info & 0x80) != 0)
// state += "info+";
//else
// state += "info-";
//DialogProvider.ShowWarning(state, "TD0 loader");
#endregion
var description = string.Empty;
if ((mainHdr.Info & 0x80) != 0)
{
var tmp = new byte[4];
dataStream.Read(tmp, 0, 2); // crc
dataStream.Read(tmp, 2, 2); // length
var info = new byte[getUInt16(tmp, 2) + 10];
for (int i = 0; i < 4; i++)
{
info[i] = tmp[i];
}
dataStream.Read(info, 4, 6); // year,month,day,hour,min,sec (year is relative to 1900)
dataStream.Read(info, 10, info.Length - 10); // description
if (CrcTd0.Calculate(info, 2, 8 + getUInt16(info, 2)) != getUInt16(info, 0))
{
Locator.Resolve <IUserMessage>()
.Warning("TD0 loader\n\nInfo crc wrong!");
}
// combine lines splitted by zero
var builder = new StringBuilder();
int begin = 10, end = 10;
for (; end < info.Length; end++)
{
if (info[end] == 0 && end > begin)
{
builder.Append(Encoding.ASCII.GetString(info, begin, end - begin));
builder.Append("\n");
begin = end + 1;
}
}
description = builder.ToString();
}
var cylCount = -1;
var sideCount = -1;
var trackList = new List <TD0_TRACK>();
for (; ;)
{
var track = TD0_TRACK.Deserialize(dataStream);
if (track.SectorCount == 0xFF)
{
break;
}
trackList.Add(track);
if (cylCount < track.Cylinder)
{
cylCount = track.Cylinder;
}
if (sideCount < track.Side)
{
sideCount = track.Side;
}
}
cylCount++;
sideCount++;
if (cylCount < 1 || sideCount < 1)
{
Locator.Resolve <IUserMessage>()
.Error("TD0 loader\n\nInvalid disk structure");
return(false);
}
_diskImage.SetPhysics(cylCount, sideCount);
foreach (TD0_TRACK trk in trackList)
{
_diskImage.GetTrackImage(trk.Cylinder, trk.Side).AssignSectors(trk.SectorList);
}
_diskImage.Description = description;
return(true);
}
