public Stream OpenItem(string id)
{
EnsureLoaded();
var item = _items[id];
return(_bspFile.GetSubStream(item.FileOffset, item.FileLength));
}
public Stream OpenItem(string id)
{
EnsureLoaded();
var item = _items[id];
// Find index of current lump
var keyArray = _items.Keys.ToArray();
int index = -1;
for (int i = 0; i < keyArray.Length; i++)
{
if (keyArray[i] == id)
{
index = i;
break;
}
}
// https://developer.valvesoftware.com/wiki/Source_BSP_File_Format#Lump_compression
// Get the actual length of the item using offset of the next item.
var valueArray = _items.Values.ToArray();
var actualLength = item.FileLength;
if (index != -1)
{
if (index < _items.Count - 1)
{
// The last game lump is /supposed/ to be a dummy containing nothing but the offset,
// but sometimes the offset is 0 which would result in negative actualLength.
if (valueArray[index + 1].FileOffset > valueArray[index].FileOffset)
{
actualLength = valueArray[index + 1].FileOffset - valueArray[index].FileOffset;
}
}
}
var stream = _bspFile.GetSubStream(item.FileOffset, actualLength);
LzmaHeader lzmaHeader;
try
{
lzmaHeader = LzmaHeader.Read(stream);
}
catch (NotSupportedException e)
{
stream.Seek(0, SeekOrigin.Begin);
return(stream);
}
using (var compressedStream =
_bspFile.GetSubStream(item.FileOffset + LzmaHeader.Size, lzmaHeader.LzmaSize))
{
using (var uncompressedStream = new MemoryStream(( int )lzmaHeader.ActualSize))
{
Decoder decoder = new Decoder();
decoder.SetDecoderProperties(lzmaHeader.Properties);
decoder.Code(compressedStream, uncompressedStream, lzmaHeader.LzmaSize,
lzmaHeader.ActualSize, null);
stream = new MemoryStream(( int )stream.Length);
uncompressedStream.Seek(0, SeekOrigin.Begin);
uncompressedStream.CopyTo(stream);
}
}
stream.Seek(0, SeekOrigin.Begin);
return(stream);
}
