diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj index 77cbb52b..edb5e98e 100644 --- a/ArcFormats/ArcFormats.csproj +++ b/ArcFormats/ArcFormats.csproj @@ -130,6 +130,7 @@ + diff --git a/ArcFormats/RPGMaker/ArcRGSS.cs b/ArcFormats/RPGMaker/ArcRGSS.cs new file mode 100644 index 00000000..61ab3442 --- /dev/null +++ b/ArcFormats/RPGMaker/ArcRGSS.cs @@ -0,0 +1,178 @@ +//! \file ArcRGSS3.cs +//! \date 2017 Nov 18 +//! \brief RPG Maker resource archive implementation. +// +// Copyright (C) 2017 by morkt +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to +// deal in the Software without restriction, including without limitation the +// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or +// sell copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS +// IN THE SOFTWARE. +// + +using System; +using System.Collections.Generic; +using System.ComponentModel.Composition; +using System.IO; +using System.Text; + +namespace GameRes.Formats.RPGMaker +{ + [Export(typeof(ArchiveFormat))] + public class RgssOpener : ArchiveFormat + { + public override string Tag { get { return "RGSSAD"; } } + public override string Description { get { return "RPG Maker engine resource archive"; } } + public override uint Signature { get { return 0x53534752; } } // 'RGSS' + public override bool IsHierarchic { get { return true; } } + public override bool CanWrite { get { return false; } } + + public RgssOpener () + { + Extensions = new string[] { "rgss3a", "rgss2a", "rgssad" }; + } + + public override ArcFile TryOpen (ArcView file) + { + if (!file.View.AsciiEqual (4, "AD\0")) + return null; + int version = file.View.ReadByte (7); + if (version != 3) + return null; + using (var index = file.CreateStream()) + { + List dir = null; + if (3 == version) + dir = ReadIndexV3 (index); + else if (1 == version) + dir = ReadIndexV1 (index); + if (null == dir || 0 == dir.Count) + return null; + return new ArcFile (file, this, dir); + } + } + + List ReadIndexV1 (IBinaryStream file) + { + var max_offset = file.Length; + file.Position = 8; + var key_gen = new KeyGenerator (0xDEADCAFE); + var dir = new List(); + while (file.PeekByte() != -1) + { + uint name_length = file.ReadUInt32() ^ key_gen.GetNext(); + var name_bytes = file.ReadBytes ((int)name_length); + var name = DecryptName (name_bytes, key_gen); + var entry = FormatCatalog.Instance.Create (name); + entry.Size = file.ReadUInt32() ^ key_gen.GetNext(); + entry.Offset = file.Position; + entry.Key = key_gen.Current; + if (!entry.CheckPlacement (max_offset)) + return null; + dir.Add (entry); + file.Seek (entry.Size, SeekOrigin.Current); + } + return dir; + } + + List ReadIndexV3 (IBinaryStream file) + { + var max_offset = file.Length; + file.Position = 8; + uint key = file.ReadUInt32() * 9 + 3; + var dir = new List(); + while (file.PeekByte() != -1) + { + uint offset = file.ReadUInt32() ^ key; + if (0 == offset) + break; + uint size = file.ReadUInt32() ^ key; + uint entry_key = file.ReadUInt32() ^ key; + uint name_length = file.ReadUInt32() ^ key; + var name_bytes = file.ReadBytes ((int)name_length); + var name = DecryptName (name_bytes, key); + var entry = FormatCatalog.Instance.Create (name); + entry.Offset = offset; + entry.Size = size; + entry.Key = entry_key; + if (!entry.CheckPlacement (max_offset)) + return null; + dir.Add (entry); + } + return dir; + } + + public override Stream OpenEntry (ArcFile arc, Entry entry) + { + var rent = (RgssEntry)entry; + var data = arc.File.View.ReadBytes (rent.Offset, rent.Size); + var key_gen = new KeyGenerator (rent.Key); + uint key = key_gen.GetNext(); + for (int i = 0; i < data.Length; ) + { + data[i] ^= (byte)(key >> (i << 3)); + ++i; + if (0 == (i & 3)) + { + key = key_gen.GetNext(); + } + } + return new BinMemoryStream (data); + } + + string DecryptName (byte[] name, KeyGenerator key_gen) + { + for (int i = 0; i < name.Length; ++i) + { + name[i] ^= (byte)key_gen.GetNext(); + } + return Encoding.UTF8.GetString (name); + } + + string DecryptName (byte[] name, uint key) + { + for (int i = 0; i < name.Length; ++i) + { + name[i] ^= (byte)(key >> (i << 3)); + } + return Encoding.UTF8.GetString (name); + } + } + + internal class RgssEntry : Entry + { + public uint Key; + } + + internal class KeyGenerator + { + uint m_seed; + + public KeyGenerator (uint seed) + { + m_seed = seed; + } + + public uint Current { get { return m_seed; } } + + public uint GetNext () + { + uint key = m_seed; + m_seed = m_seed * 7 + 3; + return key; + } + } +}