/// <summary>
/// Takes a double-sided disk byte array and converts into 2 single-sided arrays
/// </summary>
public static bool SplitDoubleSided(byte[] data, List <byte[]> results)
{
// look for standard magic string
string ident = Encoding.ASCII.GetString(data, 0, 16);
if (!ident.ToUpper().Contains("MV - CPC"))
{
// incorrect format
return(false);
}
byte[] S0 = new byte[data.Length];
byte[] S1 = new byte[data.Length];
// disk info block
Array.Copy(data, 0, S0, 0, 0x100);
Array.Copy(data, 0, S1, 0, 0x100);
// change side number
S0[0x31] = 1;
S1[0x31] = 1;
int trkSize = MediaConverter.GetWordValue(data, 0x32);
// start at track info blocks
int mPos = 0x100;
int s0Pos = 0x100;
int s1Pos = 0x100;
while (mPos < trkSize * data[0x30] * data[0x31])
{
// which side is this?
var side = data[mPos + 0x11];
if (side == 0)
{
// side 1
Array.Copy(data, mPos, S0, s0Pos, trkSize);
s0Pos += trkSize;
}
else if (side == 1)
{
// side 2
Array.Copy(data, mPos, S1, s1Pos, trkSize);
s1Pos += trkSize;
}
mPos += trkSize;
}
byte[] s0final = new byte[s0Pos];
byte[] s1final = new byte[s1Pos];
Array.Copy(S0, 0, s0final, 0, s0Pos);
Array.Copy(S1, 0, s1final, 0, s1Pos);
results.Add(s0final);
results.Add(s1final);
return(true);
}
/// <summary>
/// Attempts to parse incoming disk data
/// </summary>
/// <returns>
/// TRUE: disk parsed
/// FALSE: unable to parse disk
/// </returns>
public override bool ParseDisk(byte[] data)
{
// look for standard magic string
string ident = Encoding.ASCII.GetString(data, 0, 16);
if (!ident.ToUpper().Contains("EXTENDED CPC DSK"))
{
// incorrect format
return(false);
}
// read the disk information block
DiskHeader.DiskIdent = ident;
DiskHeader.DiskCreatorString = Encoding.ASCII.GetString(data, 0x22, 14);
DiskHeader.NumberOfTracks = data[0x30];
DiskHeader.NumberOfSides = data[0x31];
DiskHeader.TrackSizes = new int[DiskHeader.NumberOfTracks * DiskHeader.NumberOfSides];
DiskTracks = new Track[DiskHeader.NumberOfTracks * DiskHeader.NumberOfSides];
DiskData = data;
int pos = 0x34;
if (DiskHeader.NumberOfSides > 1)
{
StringBuilder sbm = new StringBuilder();
sbm.AppendLine();
sbm.AppendLine();
sbm.AppendLine("The detected disk image contains multiple sides.");
sbm.AppendLine("This is NOT currently supported in CPCHawk.");
sbm.AppendLine("Please find an alternate image/dump where each side has been saved as a separate *.dsk image (and use the multi-disk bundler tool to load into Bizhawk).");
throw new System.NotImplementedException(sbm.ToString());
}
for (int i = 0; i < DiskHeader.NumberOfTracks * DiskHeader.NumberOfSides; i++)
{
DiskHeader.TrackSizes[i] = data[pos++] * 256;
}
// move to first track information block
pos = 0x100;
// parse each track
for (int i = 0; i < DiskHeader.NumberOfTracks * DiskHeader.NumberOfSides; i++)
{
// check for unformatted track
if (DiskHeader.TrackSizes[i] == 0)
{
DiskTracks[i] = new Track {
Sectors = new Sector[0]
};
continue;
}
int p = pos;
DiskTracks[i] = new Track();
// track info block
DiskTracks[i].TrackIdent = Encoding.ASCII.GetString(data, p, 12);
p += 16;
DiskTracks[i].TrackNumber = data[p++];
DiskTracks[i].SideNumber = data[p++];
DiskTracks[i].DataRate = data[p++];
DiskTracks[i].RecordingMode = data[p++];
DiskTracks[i].SectorSize = data[p++];
DiskTracks[i].NumberOfSectors = data[p++];
DiskTracks[i].GAP3Length = data[p++];
DiskTracks[i].FillerByte = data[p++];
int dpos = pos + 0x100;
// sector info list
DiskTracks[i].Sectors = new Sector[DiskTracks[i].NumberOfSectors];
for (int s = 0; s < DiskTracks[i].NumberOfSectors; s++)
{
DiskTracks[i].Sectors[s] = new Sector
{
TrackNumber = data[p++],
SideNumber = data[p++],
SectorID = data[p++],
SectorSize = data[p++],
Status1 = data[p++],
Status2 = data[p++],
ActualDataByteLength = MediaConverter.GetWordValue(data, p)
};
p += 2;
// sector data - begins at 0x100 offset from the start of the track info block (in this case dpos)
DiskTracks[i].Sectors[s].SectorData = new byte[DiskTracks[i].Sectors[s].ActualDataByteLength];
// copy the data
for (int b = 0; b < DiskTracks[i].Sectors[s].ActualDataByteLength; b++)
{
DiskTracks[i].Sectors[s].SectorData[b] = data[dpos + b];
}
// check for multiple weak/random sectors stored
if (DiskTracks[i].Sectors[s].SectorSize <= 7)
{
// sectorsize n=8 is equivilent to n=0 - FDC will use DTL for length
int specifiedSize = 0x80 << DiskTracks[i].Sectors[s].SectorSize;
if (specifiedSize < DiskTracks[i].Sectors[s].ActualDataByteLength)
{
// more data stored than sectorsize defines
// check for multiple weak/random copies
if (DiskTracks[i].Sectors[s].ActualDataByteLength % specifiedSize != 0)
{
DiskTracks[i].Sectors[s].ContainsMultipleWeakSectors = true;
}
}
}
// move dpos to the next sector data postion
dpos += DiskTracks[i].Sectors[s].ActualDataByteLength;
}
// move to the next track info block
pos += DiskHeader.TrackSizes[i];
}
// run protection scheme detector
ParseProtection();
return(true);
}
/// <summary>
/// Attempts to parse incoming disk data
/// </summary>
/// <returns>
/// TRUE: disk parsed
/// FALSE: unable to parse disk
/// </returns>
public override bool ParseDisk(byte[] data)
{
// look for standard magic string
string ident = Encoding.ASCII.GetString(data, 0, 16);
if (!ident.ToUpper().Contains("MV - CPC"))
{
// incorrect format
return(false);
}
// read the disk information block
DiskHeader.DiskIdent = ident;
DiskHeader.DiskCreatorString = Encoding.ASCII.GetString(data, 0x22, 14);
DiskHeader.NumberOfTracks = data[0x30];
DiskHeader.NumberOfSides = data[0x31];
DiskHeader.TrackSizes = new int[DiskHeader.NumberOfTracks * DiskHeader.NumberOfSides];
DiskTracks = new Track[DiskHeader.NumberOfTracks * DiskHeader.NumberOfSides];
DiskData = data;
int pos = 0x32;
if (DiskHeader.NumberOfSides > 1)
{
StringBuilder sbm = new StringBuilder();
sbm.AppendLine();
sbm.AppendLine();
sbm.AppendLine("The detected disk image contains multiple sides.");
sbm.AppendLine("This is NOT currently supported in CPCHawk.");
sbm.AppendLine("Please find an alternate image/dump where each side has been saved as a separate *.dsk image (and use the multi-disk bundler tool to load into Bizhawk).");
throw new System.NotImplementedException(sbm.ToString());
}
// standard CPC format all track sizes are the same in the image
for (int i = 0; i < DiskHeader.NumberOfTracks * DiskHeader.NumberOfSides; i++)
{
DiskHeader.TrackSizes[i] = MediaConverter.GetWordValue(data, pos);
}
// move to first track information block
pos = 0x100;
// parse each track
for (int i = 0; i < DiskHeader.NumberOfTracks * DiskHeader.NumberOfSides; i++)
{
// check for unformatted track
if (DiskHeader.TrackSizes[i] == 0)
{
DiskTracks[i] = new Track {
Sectors = new Sector[0]
};
continue;
}
int p = pos;
DiskTracks[i] = new Track();
// track info block
DiskTracks[i].TrackIdent = Encoding.ASCII.GetString(data, p, 12);
p += 16;
DiskTracks[i].TrackNumber = data[p++];
DiskTracks[i].SideNumber = data[p++];
p += 2;
DiskTracks[i].SectorSize = data[p++];
DiskTracks[i].NumberOfSectors = data[p++];
DiskTracks[i].GAP3Length = data[p++];
DiskTracks[i].FillerByte = data[p++];
int dpos = pos + 0x100;
// sector info list
DiskTracks[i].Sectors = new Sector[DiskTracks[i].NumberOfSectors];
for (int s = 0; s < DiskTracks[i].NumberOfSectors; s++)
{
DiskTracks[i].Sectors[s] = new Sector
{
TrackNumber = data[p++],
SideNumber = data[p++],
SectorID = data[p++],
SectorSize = data[p++],
Status1 = data[p++],
Status2 = data[p++],
ActualDataByteLength = MediaConverter.GetWordValue(data, p)
};
p += 2;
// actualdatabytelength value is calculated now
if (DiskTracks[i].Sectors[s].SectorSize == 0)
{
// no sectorsize specified - DTL will be used at runtime
DiskTracks[i].Sectors[s].ActualDataByteLength = DiskHeader.TrackSizes[i];
}
else if (DiskTracks[i].Sectors[s].SectorSize > 6)
{
// invalid - wrap around to 0
DiskTracks[i].Sectors[s].ActualDataByteLength = DiskHeader.TrackSizes[i];
}
else if (DiskTracks[i].Sectors[s].SectorSize == 6)
{
// only 0x1800 bytes are stored
DiskTracks[i].Sectors[s].ActualDataByteLength = 0x1800;
}
else
{
// valid sector size for this format
DiskTracks[i].Sectors[s].ActualDataByteLength = 0x80 << DiskTracks[i].Sectors[s].SectorSize;
}
// sector data - begins at 0x100 offset from the start of the track info block (in this case dpos)
DiskTracks[i].Sectors[s].SectorData = new byte[DiskTracks[i].Sectors[s].ActualDataByteLength];
// copy the data
for (int b = 0; b < DiskTracks[i].Sectors[s].ActualDataByteLength; b++)
{
DiskTracks[i].Sectors[s].SectorData[b] = data[dpos + b];
}
// move dpos to the next sector data postion
dpos += DiskTracks[i].Sectors[s].ActualDataByteLength;
}
// move to the next track info block
pos += DiskHeader.TrackSizes[i];
}
// run protection scheme detector
ParseProtection();
return(true);
}
