public static LPack FromData(byte[] Data)
{
if (Data.Length < 0x10)
{
return(null);
}
LPack Output = new LPack();
using (MemoryStream Input = new MemoryStream(Data))
{
BinaryReader Reader = new BinaryReader(Input);
uint FilesCount = Reader.ReadUInt32();
uint FileDecLength = Reader.ReadUInt32();
//Simple validity check
uint FirstAddr = 8 + FilesCount * 8;
Input.Seek(4, SeekOrigin.Current);
if (Reader.ReadUInt32() != FirstAddr)
{
return(null);
}
Output.Files = new PackFile[FilesCount];
for (int i = 0; i < FilesCount; i++)
{
Input.Seek(8 + i * 8, SeekOrigin.Begin);
uint DecLength = Utils.ReadUInt24(Reader);
byte FileId = Reader.ReadByte();
uint Address = Reader.ReadUInt32();
Output.Files[i].FileId = FileId;
Output.Files[i].Data = LZSS.Decompress(Data, Address, DecLength);
}
}
return(Output);
}
public static byte[] ToData(LPack Pack)
{
using (MemoryStream Output = new MemoryStream())
{
BinaryWriter Writer = new BinaryWriter(Output);
Writer.Write(Pack.Files.Length);
Writer.Write(0u); //Total decompressed length Place Holder
uint DataAddress = (uint)(8 + Pack.Files.Length * 8);
uint FileDecLength = 0;
for (int i = 0; i < Pack.Files.Length; i++)
{
Output.Seek(8 + i * 8, SeekOrigin.Begin);
Utils.WriteUInt24(Writer, (uint)Pack.Files[i].Data.Length);
Writer.Write(Pack.Files[i].FileId);
Writer.Write(DataAddress);
Output.Seek(DataAddress, SeekOrigin.Begin);
byte[] Comp = LZSS.Compress(Pack.Files[i].Data);
Writer.Write(Comp);
DataAddress += (uint)Comp.Length;
FileDecLength += (uint)Pack.Files[i].Data.Length;
}
Output.Seek(4, SeekOrigin.Begin);
Writer.Write(FileDecLength);
return(Output.ToArray());
}
}
