SaveFileDescription-HL2-Portal.txt

Source engine save files:  //Version 115
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struct Header
{
	char[4] MagicWord == "J","S","A","V";
	int SaveVersion; //int32
	int TokenTableFileTableOffset; //int32 
	int TokenCount; //int32 
	int TokenTableSize; //int32 
	
}
Read Header then from currpos seek <TokenTableSize> then <TokenTableFileTableOffset>.
After this the archive begins so now *.hl? files:
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Not you will most likely have mapname*3 mapstate files.
Here you will have a statefile name which is 260 char long (trim \0 at the end) then
an int32 which is the length of the valv file.
Do this until end of file. Since VALV files are compressed with CLZSS a costum compressor
made by valve you have to decode them.