public void Run()
{
using (var fs = File.OpenRead(IN_Path))
{
BinaryReader br = new BinaryReader(fs);
string sig = br.ReadStringFixedAscii(4);
if (sig != "SBI\0")
throw new SBIParseException("Missing magic number");
SubQPatchData ret = new SubQPatchData();
List<short> bytes = new List<short>();
//read records until done
for (; ; )
{
//graceful end
if (fs.Position == fs.Length)
break;
if (fs.Position + 4 > fs.Length) throw new SBIParseException("Broken record");
var m = BCD2.BCDToInt(br.ReadByte());
var s = BCD2.BCDToInt(br.ReadByte());
var f = BCD2.BCDToInt(br.ReadByte());
var ts = new Timestamp(m, s, f);
ret.ABAs.Add(ts.Sector);
int type = br.ReadByte();
switch (type)
{
case 1: //Q0..Q9
if (fs.Position + 10 > fs.Length) throw new SBIParseException("Broken record");
for (int i = 0; i <= 9; i++) bytes.Add(br.ReadByte());
for (int i = 10; i <= 11; i++) bytes.Add(-1);
break;
case 2: //Q3..Q5
if (fs.Position + 3 > fs.Length) throw new SBIParseException("Broken record");
for (int i = 0; i <= 2; i++) bytes.Add(-1);
for (int i = 3; i <= 5; i++) bytes.Add(br.ReadByte());
for (int i = 6; i <= 11; i++) bytes.Add(-1);
break;
case 3: //Q7..Q9
if (fs.Position + 3 > fs.Length) throw new SBIParseException("Broken record");
for (int i = 0; i <= 6; i++) bytes.Add(-1);
for (int i = 7; i <= 9; i++) bytes.Add(br.ReadByte());
for (int i = 10; i <= 11; i++) bytes.Add(-1);
break;
default:
throw new SBIParseException("Broken record");
}
}
ret.subq = bytes.ToArray();
OUT_Data = ret;
}
}
/// <summary>
/// applies an SBI file to the disc
/// </summary>
public void Run(Disc disc, SBI.SubQPatchData sbi, bool asMednafen)
{
//TODO - could implement as a blob, to avoid allocating so many byte buffers
//save this, it's small, and we'll want it for disc processing a/b checks
disc.Memos["sbi"] = sbi;
DiscSectorReader dsr = new DiscSectorReader(disc);
int n = sbi.ABAs.Count;
int b = 0;
for (int i = 0; i < n; i++)
{
int lba = sbi.ABAs[i] - 150;
//create a synthesizer which can return the patched data
var ss_patchq = new SS_PatchQ()
{
Original = disc._Sectors[lba + 150]
};
byte[] subQbuf = ss_patchq.Buffer_SubQ;
//read the old subcode
dsr.ReadLBA_SubQ(lba, subQbuf, 0);
//insert patch
disc._Sectors[lba + 150] = ss_patchq;
//apply SBI patch
for (int j = 0; j < 12; j++)
{
short patch = sbi.subq[b++];
if (patch == -1)
{
continue;
}
else
{
subQbuf[j] = (byte)patch;
}
}
//Apply mednafen hacks
//The reasoning here is that we know we expect these sectors to have a wrong checksum. therefore, generate a checksum, and make it wrong
//However, this seems senseless to me. The whole point of the SBI data is that it stores the patches needed to generate an acceptable subQ, right?
if (asMednafen)
{
SynthUtils.SubQ_SynthChecksum(subQbuf, 0);
subQbuf[10] ^= 0xFF;
subQbuf[11] ^= 0xFF;
}
}
}
/// <exception cref="SBIParseException">file at <see cref="IN_Path"/> does not contain valid header or contains misformatted record</exception>
public override void Run()
{
using var fs = File.OpenRead(IN_Path);
BinaryReader br = new BinaryReader(fs);
string sig = br.ReadStringFixedAscii(4);
if (sig != "SBI\0")
{
throw new SBIParseException("Missing magic number");
}
SubQPatchData ret = new SubQPatchData();
List <short> bytes = new List <short>();
//read records until done
for (; ;)
{
//graceful end
if (fs.Position == fs.Length)
{
break;
}
if (fs.Position + 4 > fs.Length)
{
throw new SBIParseException("Broken record");
}
var m = BCD2.BCDToInt(br.ReadByte());
var s = BCD2.BCDToInt(br.ReadByte());
var f = BCD2.BCDToInt(br.ReadByte());
var ts = new Timestamp(m, s, f);
ret.ABAs.Add(ts.Sector);
int type = br.ReadByte();
switch (type)
{
case 1: //Q0..Q9
if (fs.Position + 10 > fs.Length)
{
throw new SBIParseException("Broken record");
}
for (int i = 0; i <= 9; i++)
{
bytes.Add(br.ReadByte());
}
for (int i = 10; i <= 11; i++)
{
bytes.Add(-1);
}
break;
case 2: //Q3..Q5
if (fs.Position + 3 > fs.Length)
{
throw new SBIParseException("Broken record");
}
for (int i = 0; i <= 2; i++)
{
bytes.Add(-1);
}
for (int i = 3; i <= 5; i++)
{
bytes.Add(br.ReadByte());
}
for (int i = 6; i <= 11; i++)
{
bytes.Add(-1);
}
break;
case 3: //Q7..Q9
if (fs.Position + 3 > fs.Length)
{
throw new SBIParseException("Broken record");
}
for (int i = 0; i <= 6; i++)
{
bytes.Add(-1);
}
for (int i = 7; i <= 9; i++)
{
bytes.Add(br.ReadByte());
}
for (int i = 10; i <= 11; i++)
{
bytes.Add(-1);
}
break;
default:
throw new SBIParseException("Broken record");
}
}
ret.subq = bytes.ToArray();
OUT_Data = ret;
}
