mirror of
https://github.com/crskycode/GARbro.git
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349 lines
13 KiB
C#
349 lines
13 KiB
C#
//! \file ArcDRS.cs
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//! \date Thu Aug 21 06:11:09 2014
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//! \brief Digital Romance System archive implementation.
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//
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// Copyright (C) 2014 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using GameRes.Utility;
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using GameRes.Formats.Strings;
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using GameRes.Formats.Properties;
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namespace GameRes.Formats.Ikura
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{
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[Export(typeof(ArchiveFormat))]
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public class DrsOpener : ArchiveFormat
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{
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public override string Tag { get { return "DRS"; } }
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public override string Description { get { return "Digital Romance System resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanCreate { get { return false; } }
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public DrsOpener ()
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{
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Extensions = Enumerable.Empty<string>(); // DRS archives have no extensions
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (file.MaxOffset > uint.MaxValue)
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return null;
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int dir_size = file.View.ReadUInt16 (0);
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if (dir_size < 0x20 || 0 != (dir_size & 0xf) || dir_size + 2 >= file.MaxOffset)
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return null;
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byte first = file.View.ReadByte (2);
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if (0 == first)
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return null;
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file.View.Reserve (0, (uint)dir_size + 2);
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int dir_offset = 2;
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uint next_offset = file.View.ReadUInt32 (dir_offset+12);
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if (next_offset > file.MaxOffset || next_offset < dir_size+2)
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return null;
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var encoding = Encodings.cp932.WithFatalFallback();
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byte[] name_raw = new byte[12];
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int count = dir_size / 0x10 - 1;
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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file.View.Read (dir_offset, name_raw, 0, 12);
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int name_length = name_raw.Length;
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while (name_length > 0 && 0 == name_raw[name_length-1])
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--name_length;
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if (0 == name_length)
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return null;
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uint offset = next_offset;
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dir_offset += 0x10;
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next_offset = file.View.ReadUInt32 (dir_offset+12);
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if (next_offset > file.MaxOffset || next_offset < offset)
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return null;
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string name = encoding.GetString (name_raw, 0, name_length).ToLowerInvariant();
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = offset;
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entry.Size = next_offset - offset;
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dir.Add (entry);
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}
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return new ArcFile (file, this, dir);
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}
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}
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[Serializable]
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public class IsfScheme : ResourceScheme
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{
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public Dictionary<string, byte[]> KnownSecrets;
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}
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internal class IsfOptions : ResourceOptions
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{
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public byte[] Secret;
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}
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internal class IsfArchive : ArcFile
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{
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public byte[] Secret;
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public IsfArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] secret = null)
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: base (arc, impl, dir)
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{
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Secret = secret;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class MpxOpener : ArchiveFormat
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{
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public override string Tag { get { return "IKURA/GDL"; } }
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public override string Description { get { return "IKURA GDL resource archive"; } }
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public override uint Signature { get { return 0x4d324d53; } } // 'SM2M'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanCreate { get { return false; } }
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public MpxOpener ()
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{
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Extensions = Enumerable.Empty<string>(); // DRS archives have no extensions
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (4, "PX10") || file.MaxOffset > uint.MaxValue)
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return null;
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int count = file.View.ReadInt32 (8);
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if (count <= 0 || count > 0xfffff)
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return null;
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uint index_size = file.View.ReadUInt32 (12);
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if (index_size > file.MaxOffset)
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return null;
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var encoding = Encodings.cp932.WithFatalFallback();
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byte[] name_raw = new byte[12];
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long dir_offset = 0x20;
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var dir = new List<Entry> (count);
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bool has_scripts = false;
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for (int i = 0; i < count; ++i)
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{
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file.View.Read (dir_offset, name_raw, 0, 12);
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int name_length = name_raw.Length;
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while (name_length > 0 && 0 == name_raw[name_length-1])
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--name_length;
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if (0 == name_length)
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return null;
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string name = encoding.GetString (name_raw, 0, name_length).ToLowerInvariant();
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Entry entry;
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if (name.EndsWith (".isf") || name.EndsWith (".snr"))
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{
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entry = new Entry { Name = name, Type = "script" };
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has_scripts = true;
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}
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else
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entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = file.View.ReadUInt32 (dir_offset+12);
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entry.Size = file.View.ReadUInt32 (dir_offset+16);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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dir_offset += 0x14;
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}
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if (has_scripts)
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return new IsfArchive (file, this, dir);
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else
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return new ArcFile (file, this, dir);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var isf = arc as IsfArchive;
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if (null == isf || entry.Type != "script" || entry.Size <= 0x10)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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bool encoded = arc.File.View.AsciiEqual (entry.Offset+entry.Size-0x10, "SECRETFILTER100a");
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uint entry_size = entry.Size;
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if (encoded)
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{
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entry_size -= 0x10;
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if (null == isf.Secret)
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isf.Secret = QuerySecret();
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if (null == isf.Secret || 0 == isf.Secret.Length)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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}
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var data = new byte[entry_size];
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arc.File.View.Read (entry.Offset, data, 0, entry_size);
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if (encoded)
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{
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var decoder = new IsfDecoder (isf.Secret);
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decoder.Decode (data);
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}
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int signature = LittleEndian.ToUInt16 (data, 4);
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if (0x9795 == signature)
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{
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ApplyTransformation (data, 8, x => x >> 2 | x << 6);
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}
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else if (0xd197 == signature)
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{
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ApplyTransformation (data, 8, x => ~x);
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}
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else if (0xce89 == signature && 0 != data[6])
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{
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byte key = data[6];
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ApplyTransformation (data, 8, x => x ^ key);
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}
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return new MemoryStream (data);
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new IsfOptions {
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Secret = GetSecret (Settings.Default.ISFScheme) ?? new byte[0]
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};
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetISF();
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}
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private byte[] QuerySecret ()
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{
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var options = Query<IsfOptions> (arcStrings.ArcEncryptedNotice);
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return options.Secret;
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}
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private static byte[] GetSecret (string scheme)
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{
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byte[] secret;
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if (KnownSecrets.TryGetValue (scheme, out secret))
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return secret;
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return null;
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}
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private static void ApplyTransformation (byte[] data, int offset, Func<byte, int> method)
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{
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for (int i = offset; i < data.Length; ++i)
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data[i] = (byte)method (data[i]);
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}
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public static Dictionary<string, byte[]> KnownSecrets = new Dictionary<string, byte[]>();
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public override ResourceScheme Scheme
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{
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get { return new IsfScheme { KnownSecrets = KnownSecrets }; }
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set { KnownSecrets = ((IsfScheme)value).KnownSecrets; }
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}
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}
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internal class IsfDecoder
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{
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byte[] m_secret;
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public IsfDecoder (byte[] secret)
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{
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m_secret = secret;
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}
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public void Decode (byte[] data)
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{
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var key_string = CreateKeyString();
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int n = 0;
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for (int i = 0; i < data.Length; )
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{
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DecodePrepare (n++, key_string);
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for (int j = 0; j < key_string.Length && i < data.Length; )
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{
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data[i++] ^= key_string[j++];
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}
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}
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}
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private byte[] CreateKeyString ()
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{
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byte[] len_str = new byte[2];
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for (int i = 0; i < 2; i++)
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len_str[i] = EncodeHex ((byte)(Chr2HexCode (m_secret[0x500 + i]) - Chr2HexCode (m_secret[0x100 + i])));
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byte[] key_string = new byte[Str2Hex (len_str)];
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for (int i = 0; i < key_string.Length; i++)
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key_string[i] = EncodeHex ((byte)(Chr2HexCode (m_secret[0x510 + i]) - Chr2HexCode (m_secret[0x110 + i])));
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return key_string;
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}
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private void DecodePrepare (int index, byte[] key_string)
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{
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int p = (index & 0x3f) * 16; // index within SecretTable
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for (int i = 0; i < key_string.Length; i++)
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key_string[i] = EncodeHex ((byte)(Chr2HexCode (key_string[i]) + Chr2HexCode (m_secret[p+i])));
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}
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private static byte EncodeHex (byte symbol)
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{
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if (symbol < 0x80)
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return HexEncodeMap[symbol % 36];
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symbol = (byte)(-(sbyte)symbol % 36);
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if (0 == symbol)
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return HexEncodeMap[0];
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return HexEncodeMap[36 - symbol];
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}
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private static byte Chr2HexCode (byte chr)
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{
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return HexTable[Chr2Hex (chr)];
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}
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private static byte Chr2Hex (byte chr)
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{
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byte code;
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if (chr >= '0' && chr <= '9')
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code = (byte)(chr - '0');
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else if (chr >= 'a' && chr <= 'z')
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code = (byte)(chr - 'a' + 10);
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else if (chr >= 'A' && chr <= 'Z')
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code = (byte)(chr - 'A' + 10);
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else
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code = 0;
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return code;
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}
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private static int Str2Hex (byte[] shex)
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{
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int idec = 0;
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for (int i = 0; i < shex.Length; ++i)
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{
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int mid = Chr2Hex (shex[i]);
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mid <<= ((shex.Length - i - 1) << 2);
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idec |= mid;
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}
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return idec;
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}
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static readonly byte[] HexEncodeMap = Encoding.ASCII.GetBytes("G5FXIL094MPRKWCJ3OEBVA7HQ2SU8Y6TZ1ND");
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static readonly byte[] HexTable = new byte[] {
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0x06, 0x21, 0x19, 0x10, 0x08, 0x01, 0x1E, 0x16, 0x1C, 0x07, 0x15, 0x13, 0x0E, 0x23, 0x12, 0x02,
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0x00, 0x17, 0x04, 0x0F, 0x0C, 0x05, 0x09, 0x22, 0x11, 0x0A, 0x18, 0x0B, 0x1A, 0x1F, 0x1B, 0x14,
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0x0D, 0x03, 0x1D, 0x20,
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};
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}
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}
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