original-war.net

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using System;
using System.IO;

namespace OldOWPExtractor
{
    struct FileHeader
    {
        // 8 bytes - unknown ??
        public byte[] Unknown;

        // 4 bytes - file length
        public uint Size;

        // 4 bytes - fule start position
        public uint StartPositon;

        // 131 bytes = 1 byte (length) + 130 bytes (file path)
        public string Path;
    }

    class Program
    {

        private static int FilesCountHeader = 8;
        private static int HeaderLength = 148;

        static void Main(string[] args)
        {
            string file;
            string outputDirectory;

            if (args.Length != 2)
            {
                Console.Out.WriteLine("Usage: program <input owp file> <output directory>");
                return;
            }
            else
            {
                file = args[0];
                outputDirectory = args[1];
            }

            if (!File.Exists(file))
            {
                Console.Out.WriteLine("Given file doesn't exists.");
                return;
            }

            Run(file, outputDirectory);

            Console.WriteLine("Done.\nPress key to close...");
            Console.ReadKey();
        }

        private static void Run(string file, string outputDirectory)
        {
            var fileContent = File.ReadAllBytes(file);
            var fileSize = fileContent.Length;

            Console.WriteLine($"File size: {fileSize:0,0}");

            int i = 0;

            var position = fileSize - FilesCountHeader;

            if (!Directory.Exists(outputDirectory))
            {
                Directory.CreateDirectory(outputDirectory);
            }

            using (var ms = new MemoryStream(fileContent))
            using (var br = new BinaryReader(ms))
            {
                br.BaseStream.Seek(position, SeekOrigin.Begin);

                var filesCount = br.ReadUInt64();

                while (filesCount-- > 0)
                {
                    position -= HeaderLength;
                    br.BaseStream.Seek(position, SeekOrigin.Begin);

                    var tmp = br.ReadBytes(HeaderLength);

                    var header = ReadHeader(tmp);

                    Console.WriteLine($"[{i++}] File: {header.Path} | Size: {header.Size:0,0} bytes |  Start: {header.StartPositon:0,0} bytes");

                    var dir = Path.Combine(outputDirectory, Path.GetDirectoryName(header.Path));
                    if (!Directory.Exists(dir))
                    {
                        Directory.CreateDirectory(dir);
                    }

                    var fullPath = Path.Combine(dir, Path.GetFileName(header.Path));

                    br.BaseStream.Seek(header.StartPositon, SeekOrigin.Begin);
                    var fileBytes = br.ReadBytes((int)header.Size);

                    File.WriteAllBytes(fullPath, fileBytes);
                }
            }

            Console.WriteLine($"All files: {i}" );

        }

        private static FileHeader ReadHeader(byte[] data)
        {
            FileHeader header = new FileHeader();

            using (var ms = new MemoryStream(data))
            using (var br = new BinaryReader(ms))
            {
                header.Unknown = br.ReadBytes(8);
                header.Size = br.ReadUInt32();
                header.StartPositon = br.ReadUInt32();
                header.Path = br.ReadString();
            }
            return header;
        }

    }
}

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OldOWPExtractor.exe <in owp file> <out dir>

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OldOWPExtractor.exe "D:\Gry\ALTAR\Original War Demo" "D:\out"