public Stream Open(PackageEntry entry)
{
List <Stream> streams = new List <Stream>();
if (entry.PreloadSize > 0)
{
streams.Add(new SubStream(_stream, entry.PreloadOffset, entry.PreloadSize));
}
if (entry.Size > 0)
{
streams.Add(new SubStream(_chunks[entry.Chunk], entry.Offset, entry.Size));
}
return(new ConcatStream(streams));
}
public VpkPackage(string directoryFile)
{
_entries = new List <PackageEntry>();
_stream = OpenFile(directoryFile);
string folder = Path.GetDirectoryName(directoryFile) ?? "";
string nameWithoutExt = Path.GetFileNameWithoutExtension(directoryFile) ?? "";
string ext = Path.GetExtension(directoryFile);
if (!nameWithoutExt.EndsWith(DirString))
{
throw new Exception("This is not a valid VPK directory file.");
}
string baseName = nameWithoutExt.Substring(0, nameWithoutExt.Length - DirString.Length);
// Scan and find all chunk files that match this vpk directory
_chunks = new Dictionary <int, Stream>();
string[] matchingFiles = Directory.GetFiles(folder, baseName + "_???" + ext);
foreach (string mf in matchingFiles)
{
string fn = Path.GetFileNameWithoutExtension(mf);
string index = fn.Substring(fn.Length - 3);
if (ushort.TryParse(index, out ushort num))
{
_chunks[num] = OpenFile(mf);
}
}
_chunks[DirectoryIndex] = _stream;
// Read the data from the vpk
using (BinaryReader br = new BinaryReader(_stream, Encoding.UTF8, true))
{
uint sig = br.ReadUInt32();
if (sig != Signature)
{
throw new Exception($"Unknown package signature: Expected 0x{Signature:x8}, got 0x{sig:x8}.");
}
uint version = br.ReadUInt32();
uint treeLength = br.ReadUInt32();
_directoryDataOffset = treeLength;
switch (version)
{
case 1:
_directoryDataOffset += 12;
break;
case 2:
_directoryDataOffset += 28;
int dataLength = br.ReadInt32();
uint archiveMd5Length = br.ReadUInt32();
int fileMd5Length = br.ReadInt32();
int signatureLength = br.ReadInt32();
break;
default:
throw new Exception($"Unknown version number: Expected 1 or 2, got {version}.");
}
// Read all the entries from the vpk
string extension, path, filename;
while ((extension = br.ReadNullTerminatedString()).Length > 0)
{
while ((path = br.ReadNullTerminatedString()).Length > 0)
{
// Single space = root directory
path = path == " " ? "" : path + '/';
while ((filename = br.ReadNullTerminatedString()).Length > 0)
{
// get me some file information
PackageEntry entry = ReadEntry(br, path + filename + "." + extension);
_entries.Add(entry);
}
}
}
}
}
public Stream Open(PackageEntry entry)
{
return(new SubStream(_stream, entry.Offset, entry.Size));
}
