mirror of
https://github.com/crskycode/GARbro.git
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340 lines
12 KiB
C#
340 lines
12 KiB
C#
//! \file ArcSteinsGate.cs
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//! \date Thu Jul 24 23:36:01 2014
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//! \brief Nitro+ Steins;Gate 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.IO;
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using System.Text;
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using System.Linq;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using GameRes.Formats.Strings;
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using GameRes.Utility;
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namespace GameRes.Formats
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{
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public class SteinsGateOptions : ResourceOptions
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{
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public Encoding FileNameEncoding { get; set; }
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}
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[Export(typeof(ArchiveFormat))]
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public class NpaSteinsGateOpener : ArchiveFormat
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{
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public override string Tag { get { return "NPA-SG"; } }
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public override string Description { get { return arcStrings.NPASteinsGateDescription; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return true; } }
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public override bool CanWrite { get { return true; } }
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public NpaSteinsGateOpener ()
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{
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Extensions = new string[] { "npa" };
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}
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internal static readonly byte[] KeyString = {
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'B'^0xff, 'U'^0xff, 'C'^0xff, 'K'^0xff,
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'T'^0xff, 'I'^0xff, 'C'^0xff, 'K'^0xff
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};
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public override ArcFile TryOpen (ArcView file)
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{
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int index_size = file.View.ReadInt32 (0);
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if (index_size < 0x14 || index_size >= file.MaxOffset || index_size > 0xffffff)
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return null;
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var stream = new SteinsGateEncryptedStream (file, 4, (uint)index_size);
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using (var header = new BinaryReader (stream))
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{
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int entry_count = header.ReadInt32();
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if (!IsSaneCount (entry_count))
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return null;
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index_size -= 4;
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int average_entry_size = index_size / entry_count;
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if (average_entry_size < 0x11)
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return null;
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var dir = new List<Entry> (entry_count);
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for (int i = 0; i < entry_count; ++i)
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{
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int name_length = header.ReadInt32();
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if (name_length+0x10 > index_size)
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return null;
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byte[] name_raw = header.ReadBytes (name_length);
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Encoding enc = GuessEncoding (name_raw);
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string filename = enc.GetString (name_raw);
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var entry = FormatCatalog.Instance.Create<Entry> (filename);
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entry.Size = header.ReadUInt32();
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entry.Offset = header.ReadInt64();
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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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index_size -= name_length+0x10;
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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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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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return new SteinsGateEncryptedStream (arc.File, entry.Offset, entry.Size);
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}
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internal void Encrypt (byte[] buffer, int offset, int count)
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{
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for (int i = 0; i < count; ++i)
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{
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buffer[offset+i] ^= KeyString[i & 7];
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}
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}
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Encoding GuessEncoding (byte[] text)
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{
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bool has_zero = false;
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bool has_non_ascii = false;
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foreach (var symbol in text)
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{
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if (0 == symbol)
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{
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has_zero = true;
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break;
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}
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else if (symbol > 0x7f)
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{
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has_non_ascii = true;
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}
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}
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if (has_zero)
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return Encoding.Unicode;
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else if (has_non_ascii)
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return Encodings.cp932;
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else
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return Encoding.ASCII;
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new SteinsGateOptions {
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FileNameEncoding = GetEncoding (Properties.Settings.Default.SGFileNameEncoding),
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};
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}
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public override object GetCreationWidget ()
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{
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return new GUI.CreateSGWidget();
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}
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Encoding GetEncoding (string name)
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{
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if ("shift-jis" == name)
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return Encodings.cp932;
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if ("utf-16" == name)
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return Encoding.Unicode;
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return Encoding.Default;
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}
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internal class RawEntry : Entry
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{
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public byte[] IndexName;
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}
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public override void Create (Stream output, IEnumerable<Entry> list, ResourceOptions options,
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EntryCallback callback)
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{
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var sg_options = GetOptions<SteinsGateOptions> (options);
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Encoding encoding = sg_options.FileNameEncoding.WithFatalFallback();
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long start_pos = output.Position;
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int callback_count = 0;
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uint index_size = 4;
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var real_entry_list = new List<RawEntry> (list.Count());
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var used_names = new HashSet<string>();
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foreach (var entry in list)
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{
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string name = entry.Name.Replace (@"\", "/");
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if (!used_names.Add (name)) // duplicate name
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continue;
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var header_entry = new RawEntry { Name = entry.Name };
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try
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{
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header_entry.IndexName = encoding.GetBytes (name);
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}
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catch (EncoderFallbackException X)
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{
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throw new InvalidFileName (entry.Name, arcStrings.MsgIllegalCharacters, X);
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}
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index_size += (uint)header_entry.IndexName.Length + 16;
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real_entry_list.Add (header_entry);
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}
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output.Seek (4+index_size, SeekOrigin.Current);
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foreach (var entry in real_entry_list)
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{
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using (var input = File.Open (entry.Name, FileMode.Open, FileAccess.Read))
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{
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var file_size = input.Length;
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if (file_size > uint.MaxValue)
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throw new FileSizeException();
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entry.Offset = output.Position;
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entry.Size = (uint)file_size;
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if (null != callback)
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callback (callback_count++, entry, arcStrings.MsgAddingFile);
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using (var stream = new SteinsGateEncryptedStream (output))
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input.CopyTo (stream);
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}
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}
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if (null != callback)
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callback (callback_count++, null, arcStrings.MsgWritingIndex);
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output.Position = start_pos;
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output.WriteByte ((byte)(index_size & 0xff));
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output.WriteByte ((byte)((index_size >> 8) & 0xff));
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output.WriteByte ((byte)((index_size >> 16) & 0xff));
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output.WriteByte ((byte)((index_size >> 24) & 0xff));
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var encrypted_stream = new SteinsGateEncryptedStream (output);
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using (var header = new BinaryWriter (encrypted_stream))
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{
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header.Write (real_entry_list.Count);
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foreach (var entry in real_entry_list)
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{
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header.Write (entry.IndexName.Length);
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header.Write (entry.IndexName);
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header.Write ((uint)entry.Size);
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header.Write ((long)entry.Offset);
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}
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}
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}
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}
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public class SteinsGateEncryptedStream : Stream
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{
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private Stream m_stream;
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private long m_base_pos;
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private bool m_should_dispose;
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public Stream BaseStream { get { return m_stream; } }
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public override bool CanRead { get { return m_stream.CanRead; } }
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public override bool CanSeek { get { return m_stream.CanSeek; } }
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public override bool CanWrite { get { return m_stream.CanWrite; } }
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public override long Length { get { return m_stream.Length - m_base_pos; } }
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public override long Position
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{
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get { return m_stream.Position - m_base_pos; }
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set { m_stream.Position = m_base_pos + value; }
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}
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public SteinsGateEncryptedStream (ArcView file, long offset, uint size)
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{
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m_stream = file.CreateStream (offset, size);
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m_should_dispose = true;
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m_base_pos = 0;
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}
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public SteinsGateEncryptedStream (Stream output)
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{
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m_stream = output;
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m_should_dispose = false;
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m_base_pos = m_stream.Position;
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}
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#region System.IO.Stream methods
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public override void Flush()
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{
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m_stream.Flush();
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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if (SeekOrigin.Begin == origin)
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offset += m_base_pos;
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offset = m_stream.Seek (offset, origin);
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return offset - m_base_pos;
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}
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public override void SetLength (long length)
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{
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throw new System.NotSupportedException ("SteinsGateEncryptedStream.SetLength method is not supported");
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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int position = (int)Position & 7;
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int read = m_stream.Read (buffer, offset, count);
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if (read > 0)
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{
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for (int i = 0; i < read; ++i)
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{
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buffer[offset+i] ^= NpaSteinsGateOpener.KeyString[(position+i)&7];
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}
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}
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return read;
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}
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public override int ReadByte ()
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{
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int position = (int)Position & 7;
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int b = m_stream.ReadByte();
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if (-1 != b)
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{
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b ^= NpaSteinsGateOpener.KeyString[position];
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}
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return b;
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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int position = (int)Position & 7;
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byte[] write_buf = new byte[count];
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for (int i = 0; i < count; ++i)
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{
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write_buf[i] = (byte)(buffer[offset+i] ^ NpaSteinsGateOpener.KeyString[(position+i)&7]);
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}
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m_stream.Write (write_buf, 0, count);
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}
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public override void WriteByte (byte value)
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{
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int position = (int)Position & 7;
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m_stream.WriteByte ((byte)(value ^ NpaSteinsGateOpener.KeyString[position]));
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}
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#endregion
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#region IDisposable Members
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bool disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (!disposed)
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{
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if (disposing && m_should_dispose)
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{
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m_stream.Dispose();
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}
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disposed = true;
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base.Dispose (disposing);
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}
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}
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#endregion
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}
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}
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