[Terraria] テラリアのMODファイルを展開するサンプル。

Extract-TMOD.cs

using System;
using System.IO;
using System.IO.Compression;
using System.Text;

class Program {
    static void Main( string[] args ) {
        var modPath = @"%USERPROFILE%\Documents\My Games\Terraria\ModLoader\Mods\CalamityMod.tmod";
        var outputDir = @"C:\Temp";

        modPath = Environment.ExpandEnvironmentVariables( modPath );
        if( !File.Exists( modPath ) ) {
            throw new FileNotFoundException( "warning!! mod not found", modPath );
        }

        using( var fileStream = File.OpenRead( modPath ) ) {
            using( var binaryReader = new BinaryReader( fileStream ) ) {
                if( Encoding.ASCII.GetString( binaryReader.ReadBytes( 4 ) ) != "TMOD" ) {
                    throw new Exception( "Magic Header != \"TMOD\"" );
                }
                var tModLoaderVersion = new Version( binaryReader.ReadString() );
                Console.WriteLine( $"ModLoader Version: {tModLoaderVersion}" );

                var hash = binaryReader.ReadBytes( 20 );
                var signature = binaryReader.ReadBytes( 256 );
                var num = binaryReader.ReadInt32();

                using( var deflateStream = new DeflateStream( fileStream, (CompressionMode)0 ) ) {
                    using( var binaryReader2 = new BinaryReader( deflateStream ) ) {
                        var name = binaryReader2.ReadString();
                        var version = new Version( binaryReader2.ReadString() );
                        var num2 = binaryReader2.ReadInt32();

                        Console.WriteLine( $"Mod Version: {version}\n" );

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

                        for( var i = 0; i < num2; i++ ) {
                            var text = binaryReader2.ReadString();
                            var size = binaryReader2.ReadInt32();
                            var data = binaryReader2.ReadBytes( size );

                            Console.Write( $"{i:0000}: {text} ..." );

                            var subPath = text.Replace( '/', Path.DirectorySeparatorChar );
                            var filePath = Path.Combine( outputDir, subPath );

                            var fileDir = Path.GetDirectoryName( filePath );
                            if( !Directory.Exists( fileDir ) ) {
                                Directory.CreateDirectory( fileDir );
                            }

                            using( var outStream = new FileStream( filePath, FileMode.OpenOrCreate ) ) {
                                using( var writer = new BinaryWriter( outStream ) ) {
                                    writer.Write( data );
                                }
                            }

                            Console.WriteLine( " Done." );
                        }

                        Console.WriteLine( "\nFinish." );
                    }
                }
            }
        }
    }
}