/// <summary>
/// Reads the entry from the VPK package.
/// </summary>
/// <param name="entry">Package entry.</param>
/// <param name="output">Output buffer.</param>
/// <param name="validateCrc">If true, CRC32 will be calculated and verified for read data.</param>
public void ReadEntry(PackageEntry entry, out byte[] output, bool validateCrc = true)
{
output = new byte[entry.SmallData.Length + entry.Length];
if (entry.SmallData.Length > 0)
{
entry.SmallData.CopyTo(output, 0);
}
if (entry.Length > 0)
{
Stream fs = null;
try
{
var offset = entry.Offset;
if (entry.ArchiveIndex != 0x7FFF)
{
if (!IsDirVPK)
{
throw new InvalidOperationException("Given VPK is not a _dir, but entry is referencing an external archive.");
}
var fileName = $"{FileName}_{entry.ArchiveIndex:D3}.vpk";
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
}
else
{
fs = Reader.BaseStream;
offset += HeaderSize + TreeSize;
}
fs.Seek(offset, SeekOrigin.Begin);
fs.Read(output, entry.SmallData.Length, (int)entry.Length);
}
finally
{
if (entry.ArchiveIndex != 0x7FFF)
{
fs?.Close();
}
}
}
if (validateCrc && entry.CRC32 != Crc32.Compute(output))
{
throw new InvalidDataException("CRC32 mismatch for read data.");
}
}
private void ReadEntries()
{
var typeEntries = new Dictionary <string, List <PackageEntry> >();
// Types
while (true)
{
var typeName = Reader.ReadNullTermString(Encoding.UTF8);
if (typeName == string.Empty)
{
break;
}
// Valve uses a space for missing extensions,
// we replace it with an empty string to match how System.IO.Path deals with it.
if (typeName == " ")
{
typeName = string.Empty;
}
var entries = new List <PackageEntry>();
// Directories
while (true)
{
var directoryName = Reader.ReadNullTermString(Encoding.UTF8);
if (directoryName == string.Empty)
{
break;
}
// Valve uses a space for blank directory names,
// we replace it with a null to match how System.IO.Path deals with root paths.
if (directoryName == " ")
{
directoryName = null;
}
// Files
while (true)
{
var fileName = Reader.ReadNullTermString(Encoding.UTF8);
if (fileName == string.Empty)
{
break;
}
var entry = new PackageEntry
{
FileName = fileName,
DirectoryName = directoryName,
TypeName = typeName,
CRC32 = Reader.ReadUInt32(),
SmallData = new byte[Reader.ReadUInt16()],
ArchiveIndex = Reader.ReadUInt16(),
Offset = Reader.ReadUInt32(),
Length = Reader.ReadUInt32()
};
if (Reader.ReadUInt16() != 0xFFFF)
{
throw new FormatException("Invalid terminator.");
}
if (entry.SmallData.Length > 0)
{
Reader.Read(entry.SmallData, 0, entry.SmallData.Length);
}
entries.Add(entry);
}
}
typeEntries.Add(typeName, entries);
}
Entries = typeEntries;
}
private void ReadEntries()
{
var typeEntries = new Dictionary <string, List <PackageEntry> >();
// Types
while (true)
{
var typeName = Reader.ReadNullTermString(Encoding.UTF8);
if (typeName?.Length == 0)
{
break;
}
var entries = new List <PackageEntry>();
// Directories
while (true)
{
var directoryName = Reader.ReadNullTermString(Encoding.UTF8);
if (directoryName?.Length == 0)
{
break;
}
// Files
while (true)
{
var fileName = Reader.ReadNullTermString(Encoding.UTF8);
if (fileName?.Length == 0)
{
break;
}
var entry = new PackageEntry
{
FileName = fileName,
DirectoryName = directoryName,
TypeName = typeName,
CRC32 = Reader.ReadUInt32(),
SmallData = new byte[Reader.ReadUInt16()],
ArchiveIndex = Reader.ReadUInt16(),
Offset = Reader.ReadUInt32(),
Length = Reader.ReadUInt32()
};
if (Reader.ReadUInt16() != 0xFFFF)
{
throw new FormatException("Invalid terminator.");
}
if (entry.SmallData.Length > 0)
{
Reader.Read(entry.SmallData, 0, entry.SmallData.Length);
}
entries.Add(entry);
}
}
typeEntries.Add(typeName, entries);
}
Entries = typeEntries;
}
