mirror of
https://github.com/crskycode/GARbro.git
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423 lines
16 KiB
C#
423 lines
16 KiB
C#
//! \file ArcUnityFS.cs
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//! \date Tue Apr 04 22:27:22 2017
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//! \brief Unity asset archive.
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//
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// Copyright (C) 2017 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 System.Text;
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using GameRes.Compression;
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using GameRes.Utility;
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namespace GameRes.Formats.Unity
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{
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[Export(typeof(ArchiveFormat))]
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public class UnityFSOpener : ArchiveFormat
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{
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public override string Tag { get { return "UNITY/FS"; } }
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public override string Description { get { return "Unity game engine asset archive"; } }
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public override uint Signature { get { return 0x74696E55; } } // 'UnityFS'
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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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public UnityFSOpener ()
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{
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Extensions = new string[] { "", "unity3d" };
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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 (0, "UnityFS\0"))
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return null;
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int arc_version = Binary.BigEndian (file.View.ReadInt32 (8));
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if (arc_version != 6)
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return null;
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long data_offset;
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byte[] index_data;
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using (var input = file.CreateStream())
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{
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input.Position = 0xC;
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input.ReadCString (Encoding.UTF8);
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input.ReadCString (Encoding.UTF8);
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long file_size = Binary.BigEndian (input.ReadInt64());
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int packed_index_size = Binary.BigEndian (input.ReadInt32());
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int index_size = Binary.BigEndian (input.ReadInt32());
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int flags = Binary.BigEndian (input.ReadInt32());
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long index_offset;
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if (0 == (flags & 0x80))
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{
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index_offset = input.Position;
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data_offset = index_offset + packed_index_size;
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}
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else
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{
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index_offset = file_size - packed_index_size;
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data_offset = input.Position;
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}
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input.Position = index_offset;
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var packed = input.ReadBytes (packed_index_size);
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switch (flags & 0x3F)
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{
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case 0:
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index_data = packed;
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break;
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case 1:
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index_data = UnpackLzma (packed, index_size);
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break;
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case 3:
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index_data = new byte[index_size];
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Lz4Compressor.DecompressBlock (packed, packed.Length, index_data, index_data.Length);
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break;
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default:
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return null;
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}
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}
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var index = new AssetDeserializer (file, data_offset);
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using (var input = new BinMemoryStream (index_data))
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index.Parse (input);
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var dir = index.LoadObjects();
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return new UnityBundle (file, this, dir, index.Segments);
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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 uarc = (UnityBundle)arc;
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Stream input = new BundleStream (uarc.File, uarc.Segments);
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input = new StreamRegion (input, entry.Offset, entry.Size);
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var aent = entry as AssetEntry;
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if (null == aent || !aent.IsEncrypted)
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return input;
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using (input)
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{
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var data = new byte[entry.Size];
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input.Read (data, 0, data.Length);
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DecryptAsset (data);
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return new BinMemoryStream (data);
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}
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}
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public override IImageDecoder OpenImage (ArcFile arc, Entry entry)
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{
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var aent = entry as AssetEntry;
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if (null == aent || aent.AssetObject.Type != "Texture2D")
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return base.OpenImage (arc, entry);
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var uarc = (UnityBundle)arc;
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var obj = aent.AssetObject;
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Stream input = new BundleStream (uarc.File, uarc.Segments);
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input = new StreamRegion (input, obj.Offset, obj.Size);
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var reader = new AssetReader (input, entry.Name);
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reader.SetupReaders (obj.Asset);
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var tex = new Texture2D();
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tex.Load (reader);
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return new Texture2DDecoder (tex, reader);
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}
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internal static byte[] UnpackLzma (byte[] input, int unpacked_size)
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{
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throw new NotImplementedException();
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}
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internal void DecryptAsset (byte[] data)
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{
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uint key = 0xBF8766F5u;
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for (int i = 0; i < data.Length; ++i)
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{
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key = ((0x343FD * key + 0x269EC3) >> 16) & 0x7FFF; // MSVC rand()
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data[i] ^= (byte)key;
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}
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}
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}
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internal class BundleEntry : Entry
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{
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public uint Flags;
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}
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internal class AssetEntry : Entry
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{
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public BundleEntry Bundle;
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public UnityObject AssetObject;
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public bool IsEncrypted;
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}
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internal class UnityBundle : ArcFile
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{
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public readonly List<BundleSegment> Segments;
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public UnityBundle (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, List<BundleSegment> segments)
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: base (arc, impl, dir)
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{
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Segments = segments;
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}
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}
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internal class BundleSegment
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{
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public long Offset;
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public uint PackedSize;
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public long UnpackedOffset;
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public uint UnpackedSize;
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public int Compression;
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public bool IsCompressed { get { return (Compression & 0x3F) != 0; } }
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}
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internal class AssetDeserializer
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{
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readonly ArcView m_file;
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readonly long m_data_offset;
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List<BundleSegment> m_segments;
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List<BundleEntry> m_bundles;
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public List<BundleSegment> Segments { get { return m_segments; } }
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public AssetDeserializer (ArcView file, long data_offset)
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{
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m_file = file;
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m_data_offset = data_offset;
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}
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public void Parse (IBinaryStream index)
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{
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index.Position = 16;
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int segment_count = Binary.BigEndian (index.ReadInt32());
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m_segments = new List<BundleSegment> (segment_count);
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long packed_offset = m_data_offset;
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long unpacked_offset = 0;
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for (int i = 0; i < segment_count; ++i)
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{
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var segment = new BundleSegment();
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segment.Offset = packed_offset;
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segment.UnpackedOffset = unpacked_offset;
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segment.UnpackedSize = Binary.BigEndian (index.ReadUInt32());
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segment.PackedSize = Binary.BigEndian (index.ReadUInt32());
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segment.Compression = Binary.BigEndian (index.ReadUInt16());
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m_segments.Add (segment);
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packed_offset += segment.PackedSize;
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unpacked_offset += segment.UnpackedSize;
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}
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int count = Binary.BigEndian (index.ReadInt32());
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m_bundles = new List<BundleEntry> (count);
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for (int i = 0; i < count; ++i)
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{
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var entry = new BundleEntry();
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entry.Offset = Binary.BigEndian (index.ReadInt64());
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entry.Size = (uint)Binary.BigEndian (index.ReadInt64());
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entry.Flags = Binary.BigEndian (index.ReadUInt32());
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entry.Name = index.ReadCString (Encoding.UTF8);
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m_bundles.Add (entry);
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}
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}
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public List<Entry> LoadObjects ()
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{
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var dir = new List<Entry>();
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using (var stream = new BundleStream (m_file, m_segments))
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{
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foreach (BundleEntry bundle in m_bundles)
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{
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if (bundle.Name.EndsWith (".resource"))
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continue;
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using (var asset_stream = new StreamRegion (stream, bundle.Offset, bundle.Size, true))
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using (var reader = new AssetReader (asset_stream, bundle.Name))
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{
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var asset = new Asset();
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asset.Load (reader);
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var object_dir = ParseAsset (stream, bundle, asset);
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dir.AddRange (object_dir);
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}
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}
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if (0 == dir.Count)
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dir.AddRange (m_bundles);
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}
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return dir;
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}
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IEnumerable<Entry> ParseAsset (Stream file, BundleEntry bundle, Asset asset)
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{
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Dictionary<long, string> id_map = null;
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var bundle_types = asset.Tree.TypeTrees.Where (t => t.Value.Type == "AssetBundle").Select (t => t.Key);
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if (bundle_types.Any())
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{
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// try to read entry names from AssetBundle object
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int bundle_type_id = bundle_types.First();
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var asset_bundle = asset.Objects.FirstOrDefault (x => x.TypeId == bundle_type_id);
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if (asset_bundle != null)
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{
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id_map = ReadAssetBundle (file, asset_bundle);
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}
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}
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if (null == id_map)
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id_map = new Dictionary<long, string>();
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foreach (var obj in asset.Objects)
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{
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var entry = ReadAsset (file, obj);
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if (null == entry.Bundle)
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entry.Bundle = bundle;
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string name;
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if (!id_map.TryGetValue (obj.PathId, out name))
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name = GetObjectName (file, obj);
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else
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name = ShortenPath (name);
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entry.Name = name;
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yield return entry;
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}
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}
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AssetEntry ReadAsset (Stream file, UnityObject obj)
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{
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string type = obj.Type;
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if ("AudioClip" == type)
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return ReadAudioClip (file, obj);
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else if ("TextAsset" == type)
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return ReadTextAsset (file, obj);
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else if ("Texture2D" == type)
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type = "image";
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return new AssetEntry {
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Type = type,
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AssetObject = obj,
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Offset = obj.Offset,
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Size = obj.Size,
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};
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}
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Dictionary<long, string> ReadAssetBundle (Stream input, UnityObject bundle)
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{
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using (var reader = bundle.Open (input))
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{
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var name = reader.ReadString(); // m_Name
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reader.Align();
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int count = reader.ReadInt32(); // m_PreloadTable
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for (int i = 0; i < count; ++i)
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{
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reader.ReadInt32(); // m_FileID
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reader.ReadInt64(); // m_PathID
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}
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count = reader.ReadInt32(); // m_Container
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var id_map = new Dictionary<long, string> (count+1);
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id_map[bundle.PathId] = name;
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for (int i = 0; i < count; ++i)
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{
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name = reader.ReadString();
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reader.Align();
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reader.ReadInt32(); // preloadIndex
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reader.ReadInt32(); // preloadSize
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reader.ReadInt32(); // m_FileID
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long id = reader.ReadInt64();
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id_map[id] = name;
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}
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return id_map;
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}
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}
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string GetObjectName (Stream input, UnityObject obj)
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{
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TypeTree type;
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if (obj.Asset.Tree.TypeTrees.TryGetValue (obj.TypeId, out type) && type.Children.Count > 0)
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{
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var first_field = type.Children[0];
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if ("m_Name" == first_field.Name && "string" == first_field.Type)
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{
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using (var reader = obj.Open (input))
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{
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var name = reader.ReadString();
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if (!string.IsNullOrEmpty (name))
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return name;
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}
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}
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}
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return obj.PathId.ToString ("X16");
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}
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AssetEntry ReadTextAsset (Stream input, UnityObject obj)
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{
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var type_def = obj.Asset.Tree.TypeTrees[obj.TypeId];
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var script = type_def.Children.FirstOrDefault (f => f.Name == "m_Script");
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if (null == script)
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return null;
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using (var reader = obj.Open (input))
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{
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var name = reader.ReadString();
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reader.Align();
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uint size = reader.ReadUInt32();
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var entry = new AssetEntry {
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AssetObject = obj,
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Offset = obj.Offset + reader.Position,
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Size = size,
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IsEncrypted = 0 != (script.Flags & 0x04000000),
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};
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if (entry.IsEncrypted)
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{
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uint signature = reader.ReadUInt32();
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if (0x0D15F641 == signature)
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entry.Type = "image";
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else if (0x474E5089 == signature)
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{
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entry.Type = "image";
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entry.IsEncrypted = false;
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}
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}
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return entry;
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}
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}
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AssetEntry ReadAudioClip (Stream input, UnityObject obj)
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{
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using (var reader = obj.Open (input))
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{
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var clip = new AudioClip();
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clip.Load (reader);
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var bundle_name = Path.GetFileName (clip.m_Source);
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var bundle = m_bundles.FirstOrDefault (b => b.Name == bundle_name);
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if (null == bundle)
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return null;
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return new AssetEntry {
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Type = "audio",
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Bundle = bundle,
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AssetObject = obj,
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Offset = bundle.Offset + clip.m_Offset,
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Size = (uint)clip.m_Size,
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};
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}
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}
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/// <summary>
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/// Shorten asset path to contain only the bottom directory component.
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/// </summary>
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static string ShortenPath (string name)
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{
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int slash_pos = name.LastIndexOf ('/');
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if (-1 == slash_pos)
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return name;
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slash_pos = name.LastIndexOf ('/', slash_pos-1);
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if (-1 == slash_pos)
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return name;
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return name.Substring (slash_pos+1);
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}
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}
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}
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