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157 lines
5.8 KiB
C#
157 lines
5.8 KiB
C#
//! \file ArcG.cs
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//! \date 2018 Jul 10
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//! \brief GLib engine resource archive.
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//
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// Copyright (C) 2018 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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namespace GameRes.Formats.GLib
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{
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internal class GmlArchive : ArcFile
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{
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public readonly byte[] Key;
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public GmlArchive (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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internal class GmlEntry : Entry
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{
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public byte[] Header;
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}
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[Export(typeof(ArchiveFormat))]
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public class GOpener : ArchiveFormat
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{
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public override string Tag { get { return "G/GML"; } }
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public override string Description { get { return "GLib engine resource archive"; } }
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public override uint Signature { get { return 0x5F4C4D47; } } // 'GML_'
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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 GOpener ()
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{
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Extensions = new string[] { "g", "xp" };
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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, "ARC\0"))
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return null;
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uint data_offset = file.View.ReadUInt32 (8);
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uint unpacked_size = file.View.ReadUInt32 (0xC);
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uint packed_size = file.View.ReadUInt32 (0x10);
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byte[] unpacked = new byte[unpacked_size];
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using (var packed = file.CreateStream (0x14, packed_size))
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using (var input = new XoredStream (packed, 0xFF))
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{
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LzssUnpack (input, unpacked);
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}
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using (var index = new BinMemoryStream (unpacked))
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{
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var key = index.ReadBytes (256);
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int count = index.ReadInt32();
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if (!IsSaneCount (count))
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return null;
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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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int name_length = index.ReadInt32();
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var name = index.ReadCString (name_length);
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var entry = FormatCatalog.Instance.Create<GmlEntry> (name);
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entry.Offset = index.ReadUInt32() + data_offset;
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entry.Size = index.ReadUInt32();
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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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entry.Header = index.ReadBytes (4);
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}
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return new GmlArchive (file, this, dir, key);
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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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var garc = arc as GmlArchive;
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var gent = entry as GmlEntry;
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if (null == garc || null == gent)
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return base.OpenEntry (arc, entry);
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var data = garc.File.View.ReadBytes (entry.Offset, entry.Size);
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for (int i = gent.Header.Length; i < data.Length; ++i)
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data[i] = garc.Key[data[i]];
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Buffer.BlockCopy (gent.Header, 0, data, 0, gent.Header.Length);
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return new BinMemoryStream (data, entry.Name);
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}
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internal static void LzssUnpack (Stream input, byte[] output)
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{
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const int frame_mask = 0xFFF;
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byte[] frame = new byte[0x1000];
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int frame_pos = 0xFEE;
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int dst = 0;
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int ctl = 2;
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while (dst < output.Length)
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{
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ctl >>= 1;
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if (1 == ctl)
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{
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ctl = input.ReadByte();
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if (-1 == ctl)
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break;
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ctl |= 0x100;
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}
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if (0 != (ctl & 1))
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{
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int b = input.ReadByte();
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if (-1 == b)
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break;
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output[dst++] = frame[frame_pos++ & frame_mask] = (byte)b;
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}
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else
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{
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int lo = input.ReadByte();
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if (-1 == lo)
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break;
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int hi = input.ReadByte();
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if (-1 == hi)
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break;
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int offset = (hi & 0xf0) << 4 | lo;
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int count = Math.Min ((~hi & 0xF) + 3, output.Length-dst);
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while (count --> 0)
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{
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byte v = frame[offset++ & frame_mask];
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frame[frame_pos++ & frame_mask] = v;
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output[dst++] = v;
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}
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}
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}
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}
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}
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}
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