private void Decompress()
{
PacHeader header = _input.EnsureRead <PacHeader>();
header.Check();
PacEntry[] entries = _input.EnsureRead <PacEntry>(header.FileCount);
Int64 beginPosition = _output.Position;
Int32 headerSize = PacHeader.StructSize + PacEntry.StructSize * entries.Length;
Int64 decompressedArchiveSize = headerSize + entries.Sum(e => (Int64)e.UncompressedSize);
Int64 totalSize = beginPosition + decompressedArchiveSize;
if (totalSize > UInt32.MaxValue)
{
throw new NotSupportedException("The game cannot address more than 4 GB of files. You can unpack this file, but you cannot decompress it.");
}
_output.SetLength(totalSize);
_output.Seek(headerSize, SeekOrigin.Current);
Int64 dataPosition = _output.Position;
for (Int32 index = 0; index < entries.Length; index++)
{
ref var entry = ref entries[index];
Boolean isCompressed = IsCompressed(entry.CompressionType);
Span <Byte> data = _reader.Read(_input, entry.CompressedSize, entry.UncompressedSize, isCompressed);
entry.Offset = checked ((UInt32)(_output.Position - dataPosition));
entry.CompressedSize = entry.UncompressedSize;
entry.CompressionType = PakCompression.None;
_output.Write(data);
}
public void Unpack()
{
PacHeader header = _input.EnsureRead <PacHeader>();
header.Check();
PacEntry[] entries = _input.EnsureRead <PacEntry>(header.FileCount);
Int64 dataPosition = _input.Position;
for (Int32 index = 0; index < entries.Length; index++)
{
ref var entry = ref entries[index];
Boolean isCompressed = PacDecompressor.IsCompressed(entry.CompressionType);
_input.SetPosition(dataPosition + entry.Offset);
Span <Byte> data = _reader.Read(_input, entry.CompressedSize, entry.UncompressedSize, isCompressed);
String outputPath = _pathBuilder.GetOutputPath(entry.RelativePath, entry.FileId);
FileSystem.CreateFileDirectory(outputPath);
using (var output = File.Create(outputPath))
output.Write(data);
}
