private static ushort[,] Parse(byte[] contents, int version)
{
if (version == 2)
{
int npar = contents.Length / stride / 2;
if (npar < 8 || npar > 32 || contents.Length != npar * stride * 2)
{
throw new Exception("invalid parity length");
}
return(ParityToSyndrome.Bytes2Syndrome(stride, 8, contents));
}
if (contents.Length < 8 * stride * 2 ||
contents.Length > 8 * stride * 4)
{
throw new Exception("invalid length");
}
ReadDB rdr = new ReadDB(contents);
int end;
string hdr = rdr.ReadHDR(out end);
uint magic = rdr.ReadUInt();
if (hdr != "ftyp" || magic != 0x43544442 || end != rdr.pos)
{
throw new Exception("invalid CTDB file");
}
hdr = rdr.ReadHDR(out end);
if (hdr != "CTDB" || end != contents.Length)
{
throw new Exception("invalid CTDB file");
}
hdr = rdr.ReadHDR(out end);
if (hdr != "HEAD")
{
throw new Exception("invalid CTDB file");
}
int endHead = end;
while (rdr.pos < endHead)
{
hdr = rdr.ReadHDR(out end);
rdr.pos = end;
}
rdr.pos = endHead;
while (rdr.pos < contents.Length)
{
hdr = rdr.ReadHDR(out end);
if (hdr != "DISC")
{
rdr.pos = end;
continue;
}
int endDisc = end;
int parPos = 0, parLen = 0;
while (rdr.pos < endDisc)
{
hdr = rdr.ReadHDR(out end);
if (hdr == "PAR ")
{
parPos = rdr.pos;
parLen = end - rdr.pos;
}
rdr.pos = end;
}
if (parPos != 0)
{
if (parLen != 8 * stride * 2)
{
throw new Exception("invalid parity length");
}
return(ParityToSyndrome.Parity2Syndrome(stride, stride, 8, 8, contents, parPos));
}
}
throw new Exception("invalid CTDB file");
}
private static ushort[,] Parse(byte[] contents, int version)
{
if (version == 2)
{
int npar = contents.Length / stride / 2;
if (npar < 8 || npar > 32 || contents.Length != npar * stride * 2)
throw new Exception("invalid parity length");
return ParityToSyndrome.Bytes2Syndrome(stride, 8, contents);
}
if (contents.Length < 8 * stride * 2
|| contents.Length > 8 * stride * 4)
throw new Exception("invalid length");
ReadDB rdr = new ReadDB(contents);
int end;
string hdr = rdr.ReadHDR(out end);
uint magic = rdr.ReadUInt();
if (hdr != "ftyp" || magic != 0x43544442 || end != rdr.pos)
throw new Exception("invalid CTDB file");
hdr = rdr.ReadHDR(out end);
if (hdr != "CTDB" || end != contents.Length)
throw new Exception("invalid CTDB file");
hdr = rdr.ReadHDR(out end);
if (hdr != "HEAD")
throw new Exception("invalid CTDB file");
int endHead = end;
while (rdr.pos < endHead)
{
hdr = rdr.ReadHDR(out end);
rdr.pos = end;
}
rdr.pos = endHead;
while (rdr.pos < contents.Length)
{
hdr = rdr.ReadHDR(out end);
if (hdr != "DISC")
{
rdr.pos = end;
continue;
}
int endDisc = end;
int parPos = 0, parLen = 0;
while (rdr.pos < endDisc)
{
hdr = rdr.ReadHDR(out end);
if (hdr == "PAR ")
{
parPos = rdr.pos;
parLen = end - rdr.pos;
}
rdr.pos = end;
}
if (parPos != 0)
{
if (parLen != 8 * stride * 2)
throw new Exception("invalid parity length");
return ParityToSyndrome.Parity2Syndrome(stride, stride, 8, 8, contents, parPos);
}
}
throw new Exception("invalid CTDB file");
}
