private static void UpdateGEOS(BinaryReader br, BinaryWriter bw, int size)
{
Console.WriteLine("'Fixing' GEOS");
// write the header and record the chunk size offset
bw.Write((uint)Chunks.GEOS);
long offset = bw.BaseStream.Position;
bw.Write(0);
long end = br.BaseStream.Position + size;
while (br.BaseStream.Position < end)
{
using (var substream = new SubStream())
{
long sectionEnd = br.BaseStream.Position + br.ReadInt32();
substream.Write(0); // inclusive size
int vertexCount = 0;
long gndxOffset = 0;
int noOf = 0;
if (br.HasTag("VRTX"))
{
vertexCount = noOf = br.ReadInt32();
br.BaseStream.Position -= 8;
substream.Write(br.ReadBytes(8 + 12 * noOf));
}
if (br.HasTag("NRMS"))
{
noOf = br.ReadInt32();
br.BaseStream.Position -= 8;
substream.Write(br.ReadBytes(8 + 12 * noOf));
}
if (br.HasTag("PTYP"))
{
noOf = br.ReadInt32();
br.BaseStream.Position -= 8;
substream.Write(br.ReadBytes(8 + 4 * noOf));
}
if (br.HasTag("PCNT"))
{
noOf = br.ReadInt32();
br.BaseStream.Position -= 8;
substream.Write(br.ReadBytes(8 + 4 * noOf));
}
if (br.HasTag("PVTX"))
{
noOf = br.ReadInt32() / 3;
br.BaseStream.Position -= 8;
substream.Write(br.ReadBytes(8 + 6 * noOf));
}
if (br.HasTag("GNDX"))
{
noOf = br.ReadInt32();
substream.Write((int)Chunks.GNDX);
if (noOf == 0) // this has been moved to the SKIN section
{
substream.Write(vertexCount);
gndxOffset = substream.Position;
substream.Write(new byte[vertexCount]);
}
else
{
substream.Write(noOf);
substream.Write(br.ReadBytes(noOf));
}
}
if (br.HasTag("MTGC"))
{
noOf = br.ReadInt32();
br.BaseStream.Position -= 8;
substream.Write(br.ReadBytes(8 + 4 * noOf));
}
if (br.HasTag("MATS"))
{
noOf = br.ReadInt32();
br.BaseStream.Position -= 8;
substream.Write(br.ReadBytes(8 + 4 * noOf));
}
substream.Write(br.ReadBytes(12)); // MaterialId, SelectionGroup, Unselectable
br.BaseStream.Position += 4 + SizeName; // skip LevelOfDetail, FilePath
substream.Write(br.ReadBytes(28)); // Bounds
noOf = br.ReadInt32(); // Extents
br.BaseStream.Position -= 4;
substream.Write(br.ReadBytes(4 + noOf * 28));
if (br.HasTag("TANG"))
{
noOf = br.ReadInt32();
br.BaseStream.Position += noOf * 16; // skip Tangents
}
if (br.HasTag("SKIN"))
{
noOf = br.ReadInt32();
// rebuild the GNDX from the SKIN section
// this is (uint32 index, uint32 weight)
// casting the indicies to bytes is "enough" for this
if (gndxOffset > 0)
{
byte[] buffer = br.ReadBytes(noOf);
substream.Position = gndxOffset;
for (int i = 0; i < buffer.Length; i += 8)
{
substream.WriteByte(buffer[i]);
}
substream.Position = substream.Length;
}
else
{
br.BaseStream.Position += noOf;
}
}
// copy anything else the chunk contains
int remaining = (int)(sectionEnd - br.BaseStream.Position);
if (remaining > 0)
{
substream.Write(br.ReadBytes(remaining));
}
// update the inclusive size and write to the filestream
substream.Position = 0;
substream.Write((int)substream.Length);
substream.WriteTo(bw.BaseStream);
}
}
// update the chunk size
bw.BaseStream.Position = offset;
bw.Write((int)(bw.BaseStream.Length - offset - 4));
bw.BaseStream.Position = bw.BaseStream.Length;
}