private void parseAndFind(BufferedRandomAccessFile fi)
{
int length, pos, i, t, sop = 0, eph = 0;
short marker;
int halfMarker;
int tileEnd;
System.Collections.Generic.List<System.Int32> markPos = new List<int>(10);
// Find position of first SOT marker
marker = (short) fi.readUnsignedShort(); // read SOC marker
marker = (short) fi.readUnsignedShort();
while (marker != CSJ2K.j2k.codestream.Markers.SOT)
{
pos = fi.Pos;
length = fi.readUnsignedShort();
// If SOP and EPH markers were only used for parsing in this
// class remove SOP and EPH markers from Scod field
if (marker == CSJ2K.j2k.codestream.Markers.COD)
{
int scod = fi.readUnsignedByte();
if (tempSop)
scod &= 0xfd; // Remove bits indicating SOP
if (tempEph)
scod &= 0xfb; // Remove bits indicating SOP
fi.seek(pos + 2);
fi.write(scod);
}
fi.seek(pos + length);
marker = (short) fi.readUnsignedShort();
}
pos = fi.Pos;
fi.seek(pos - 2);
// Find all packet headers, packed data and tile headers
for (t = 0; t < nt; t++)
{
// Read SOT marker
fi.readUnsignedShort(); // Skip SOT
pos = fi.Pos;
markPos.Add((System.Int32) fi.Pos);
fi.readInt(); // Skip Lsot and Isot
length = fi.readInt(); // Read Psot
fi.readUnsignedShort(); // Skip TPsot & TNsot
tileEnd = pos + length - 2; // Last byte of tile
// Find position of SOD marker
marker = (short) fi.readUnsignedShort();
while (marker != CSJ2K.j2k.codestream.Markers.SOD)
{
pos = fi.Pos;
length = fi.readUnsignedShort();
// If SOP and EPH markers were only used for parsing in this
// class remove SOP and EPH markers from Scod field
if (marker == CSJ2K.j2k.codestream.Markers.COD)
{
int scod = fi.readUnsignedByte();
if (tempSop)
scod &= 0xfd; // Remove bits indicating SOP
if (tempEph)
scod &= 0xfb; // Remove bits indicating SOP
fi.seek(pos + 2);
fi.write(scod);
}
fi.seek(pos + length);
marker = (short) fi.readUnsignedShort();
}
// Find all SOP and EPH markers in tile
sop = 0;
eph = 0;
i = fi.Pos;
while (i < tileEnd)
{
halfMarker = (short) fi.readUnsignedByte();
if (halfMarker == (short) 0xff)
{
marker = (short) ((halfMarker << 8) + fi.readUnsignedByte());
i++;
if (marker == CSJ2K.j2k.codestream.Markers.SOP)
{
markPos.Add((System.Int32) fi.Pos);
ppt[t]++;
sop++;
fi.skipBytes(4);
i += 4;
}
if (marker == CSJ2K.j2k.codestream.Markers.EPH)
{
markPos.Add((System.Int32) fi.Pos);
eph++;
}
}
i++;
}
}
markPos.Add((System.Int32) (fi.Pos + 2));
positions = new System.Int32[markPos.Count];
markPos.CopyTo(positions);
}
