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324 lines
12 KiB
C#
324 lines
12 KiB
C#
//! \file ArcValkyrieComplex.cs
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//! \date Sat Apr 23 14:58:33 2016
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//! \brief Valkyrie Complex resource archives.
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//
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// Copyright (C) 2016 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.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Linq;
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using GameRes.Utility;
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namespace GameRes.Formats.Circus
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{
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internal class VcPakFile : ArcFile
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{
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public readonly byte Key;
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public VcPakFile (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte key)
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: base (arc, impl, dir)
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{
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Key = key;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class VcPakOpener : ArchiveFormat
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{
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public override string Tag { get { return "PAK/VC"; } }
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public override string Description { get { return "Valkyrie Complex resource archive"; } }
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public override uint Signature { get { return 0x62827582; } } // 'ＶＣ'
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public override bool IsHierarchic { get { return true; } }
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public override bool CanWrite { get { return false; } }
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static readonly byte[] TrialSignature = Encodings.cp932.GetBytes ("ＶＣ体験版");
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static readonly byte[] RetailSignature = Encodings.cp932.GetBytes ("ＶＣ製品版");
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public VcPakOpener ()
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{
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Extensions = new string[] { "pak" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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var signature = file.View.ReadBytes (0, 10);
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bool is_trial = signature.SequenceEqual (TrialSignature);
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if (!is_trial && !signature.SequenceEqual (RetailSignature))
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return null;
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byte key = (byte)(is_trial ? 0x38 : 0x58);
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uint ukey = (uint)key << 8 | key;
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ukey |= ukey << 16;
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int count = (int)(file.View.ReadUInt32 (0x18) ^ ukey);
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if (!IsSaneCount (count))
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return null;
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uint index_size = file.View.ReadUInt32 (0x1C) ^ ukey;
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if (index_size >= file.MaxOffset)
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return null;
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var index = file.View.ReadBytes (0x20, index_size);
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for (int i = 0; i < index.Length; ++i)
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index[i] ^= key;
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int index_pos = 4;
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int names_pos = count * 0x10;
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var dir = new List<Entry> (count);
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for (uint i = 0; i < count; ++i)
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{
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int name_length = LittleEndian.ToInt32 (index, index_pos);
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var name = Encodings.cp932.GetString (index, names_pos, name_length);
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = LittleEndian.ToUInt32 (index, index_pos+4);
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entry.Size = LittleEndian.ToUInt32 (index, index_pos+8);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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if (name.HasExtension (".cps"))
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entry.Type = "image";
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dir.Add (entry);
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index_pos += 0x10;
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names_pos += name_length + 1;
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}
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return new VcPakFile (file, this, dir, (byte)(is_trial ? 0x25 : 0x24));
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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 vcarc = arc as VcPakFile;
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if (null == vcarc)
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return base.OpenEntry (arc, entry);
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var data = vcarc.File.View.ReadBytes (entry.Offset, entry.Size);
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for (int i = 0; i < data.Length; ++i)
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data[i] ^= vcarc.Key;
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if (entry.Name.HasExtension (".cs"))
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{
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for (int i = 0; i < data.Length; ++i)
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--data[i];
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}
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else if (entry.Name.HasExtension (".cps"))
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{
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data = UnpackCps (data);
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}
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return new BinMemoryStream (data, entry.Name);
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}
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byte[] UnpackCps (byte[] input)
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{
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uint unpacked_size = (LittleEndian.ToUInt32 (input, 0) ^ 0xA415FCF) & 0xFFFFFFF;
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int type = input[3] >> 4;
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if (type > 3)
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return input;
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DecryptCps (input);
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var output = new byte[unpacked_size];
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switch (type)
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{
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case 0: Buffer.BlockCopy (input, 4, output, 0, output.Length); break;
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case 1: UnpackV1 (input, output); break;
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case 2: UnpackV2 (input, output); break;
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case 3: UnpackV3 (input, output); break;
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}
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return output;
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}
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static void DecryptCps (byte[] input)
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{
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int length = input.Length;
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if (length < 0x308)
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return;
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input[4] ^= input[length - 1];
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byte key = 0xFF;
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length -= 8;
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int a = 8 + length - key;
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int b = 8 + length / 0x200 + key;
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byte t = input[a];
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input[a] = input[b];
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input[b] = t;
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a = 8 + key + 2 * (length / 0x200);
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b = 8 + length - 2 * key;
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t = input[a];
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input[a] = input[b];
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input[b] = t;
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}
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static void UnpackV1 (byte[] input, byte[] output)
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{
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int dst = 0;
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using (var mem = new MemoryStream (input, 4, input.Length-4))
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using (var bits = new ReverseBitStream (mem))
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{
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while (dst < output.Length)
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{
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int count = bits.GetBits (4);
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if (0 != bits.GetNextBit())
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{
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for (int i = 0; i <= count; ++i)
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output[dst++] = (byte)bits.GetBits (8);
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}
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else
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{
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byte b = (byte)bits.GetBits (8);
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for (int i = 0; i < count; ++i)
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output[dst++] = b;
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}
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}
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}
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}
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static void UnpackV2 (byte[] input, byte[] output)
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{
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output[output.Length-1] = input[36];
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using (var mem = new MemoryStream (input, 38, input.Length-38))
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using (var bits = new ReverseBitStream (mem))
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{
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for (int dst = 0; dst < output.Length; dst += 2)
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{
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if (0 != bits.GetNextBit())
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{
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output[dst+1] = (byte)bits.GetBits (8);
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output[dst] = (byte)bits.GetBits (8);
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}
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else
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{
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int j;
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for (j = 0; j < 30; j += 2)
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{
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if (0 != bits.GetNextBit())
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break;
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}
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output[dst] = input[4 + j];
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output[dst+1] = input[5 + j];
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}
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}
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}
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}
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static void UnpackV3 (byte[] input, byte[] output)
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{
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int src = 4;
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int dst = 0;
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if (output.Length <= 128)
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{
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Buffer.BlockCopy (input, src, output, dst, output.Length);
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return;
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}
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Buffer.BlockCopy (input, src, output, dst, 128);
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src += 128;
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dst += 128;
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using (var mem = new MemoryStream (input, src, input.Length-src))
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using (var bits = new ReverseBitStream (mem))
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{
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while (dst < output.Length)
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{
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if (0 != bits.GetNextBit())
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{
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int offset = bits.GetBits (7) + 1;
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int count = bits.GetBits (4) + 2;
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Binary.CopyOverlapped (output, dst - offset, dst, count);
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dst += count;
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}
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else
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{
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output[dst++] = (byte)bits.GetBits (8);
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}
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}
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}
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}
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}
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internal class ReverseBitStream : BitStream, IBitStream
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{
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public ReverseBitStream (Stream file, bool leave_open = false)
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: base (file, leave_open)
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{
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}
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public int GetBits (int count)
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{
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while (m_cached_bits < count)
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{
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int b = m_input.ReadByte();
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if (-1 == b)
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return -1;
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m_bits |= b << m_cached_bits;
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m_cached_bits += 8;
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}
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int value = 0;
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m_cached_bits -= count;
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while (count --> 0)
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{
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value |= (m_bits & 1) << count;
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m_bits >>= 1;
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}
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return value;
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}
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public int GetNextBit ()
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{
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return GetBits (1);
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class VcPacOpener : ArchiveFormat
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{
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public override string Tag { get { return "PAC/VC"; } }
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public override string Description { get { return "Valkyrie Complex resource archive"; } }
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public override uint Signature { get { return 1; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public VcPacOpener ()
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{
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Extensions = new string[] { "pac" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int count = file.View.ReadInt32 (4);
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if (!IsSaneCount (count))
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return null;
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uint base_offset = file.View.ReadUInt32 (8);
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uint file_size = file.View.ReadUInt32 (0xC);
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if (base_offset >= file.MaxOffset || file_size != file.MaxOffset)
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return null;
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uint index_offset = 0x20;
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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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var name = file.View.ReadString (index_offset, 0x20);
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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index_offset += 0x20;
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entry.Size = file.View.ReadUInt32 (index_offset);
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entry.Offset = file.View.ReadUInt32 (index_offset+4) + base_offset;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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index_offset += 0x18;
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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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}
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