/// <summary>
/// Writes lump data to FileStream
/// </summary>
/// <param name="input">Input stream (File)</param>
/// <param name="data">New lump data</param>
/// <param name="lumpId">Id of lump to overwrite</param>
/// <param name="output">Destination stream</param>
public static void WriteLumpData(Stream input, byte[] data, int lumpId, Stream output)
{
//Difference in length of data
int difference = 0;
//Save stream length
long streamLength = input.Length;
//Data before lump
byte[] beforeLump;
//Data after lump
byte[] afterLump;
//BSP informations
BSPInfo info;
//Collection of all lumps
Lump[] lumps = new Lump[64];
//Old lump data
Lump old = new Lump();
//Read lump data
using (BinaryReader r = new BinaryReader(input))
{
//Read BSP informations
info = BSPReader.ReadInfo(r);
lumps = info.Lumps;
//Get old lump
old = lumps[lumpId];
//Calculate difference
difference = data.Length - old.FileLength;
//Read data before changed lump
beforeLump = ReadBytes(r, 1036, old.FileOffset - 1036);
//Read data after lump
input.Seek(old.FileOffset + old.FileLength, SeekOrigin.Begin);
input.Seek(streamLength, SeekOrigin.End);
afterLump = ReadBytes(r, old.FileOffset + old.FileLength, ((int)streamLength - (old.FileOffset + old.FileLength)));
//Overwrite lump length
old.FileLength = data.Length;
//Save old lump informations
lumps[lumpId] = old;
}
//Update lump informations
for (int i = 0; i < 64; i++)
{
//Check if lump have bigger offset
if (lumps[i].FileOffset > old.FileOffset)
{
//If yes, change offset of lump
lumps[i].FileOffset += difference;
}
}
// Apply lump changes to BSP info
info.Lumps = lumps;
//Write file
using (BinaryWriter w = new BinaryWriter(output))
{
//Write file header
WriteHeader(w, info);
//Write data before modified lump
w.Write(beforeLump);
//Write modified data
w.Write(data);
//Write data after modified lump
w.Write(afterLump);
}
}
/// <summary>
/// Writes lump informations
/// </summary>
/// <param name="writer">Binary writer to write to</param>
/// <param name="info">Lump informations</param>
/// <param name="lumpId">Id of lump</param>
public static void WriteLump(BinaryWriter writer, Lump info, BSPLumps lumpId)
{
//Write lump informations
WriteLump(writer, info, (int)lumpId);
}
