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103 lines
4.1 KiB
C#
103 lines
4.1 KiB
C#
//! \file ArcCircus.cs
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//! \date Mon Jun 15 16:11:56 2015
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//! \brief Circus archive format.
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//
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// Copyright (C) 2015-2016 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 GameRes.Utility;
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namespace GameRes.Formats.Circus
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{
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[Export(typeof(ArchiveFormat))]
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public class DatOpener : ArchiveFormat
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{
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public override string Tag { get { return "DAT/CIRCUS"; } }
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public override string Description { get { return "Circus resource archive"; } }
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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 false; } }
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public DatOpener ()
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{
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Extensions = new string[] { "dat" };
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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 (0);
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if (count <= 1 || count > 0xfffff)
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return null;
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var dir = ReadIndex (file, count, 0x24);
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if (null == dir)
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dir = ReadIndex (file, count, 0x30);
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if (null == dir)
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dir = ReadIndex (file, count, 0x3C);
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if (null == dir)
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return null;
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return new ArcFile (file, this, dir);
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}
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private List<Entry> ReadIndex (ArcView file, int count, int name_length)
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{
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long index_offset = 4;
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uint index_size = (uint)((name_length + 4) * count);
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if (index_size > file.View.Reserve (index_offset, index_size))
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return null;
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--count;
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uint next_offset = file.View.ReadUInt32 (index_offset+name_length);
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if (next_offset < 4+index_size)
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return null;
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uint first_size = file.View.ReadUInt32 (index_offset+name_length-4);
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uint second_offset = file.View.ReadUInt32 (index_offset+name_length*2+4);
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if (second_offset - next_offset == first_size)
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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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string name = file.View.ReadString (index_offset, (uint)name_length);
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if (0 == name.Length)
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return null;
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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index_offset += name_length;
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uint offset = next_offset;
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if (i+1 == count)
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next_offset = (uint)file.MaxOffset;
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else
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next_offset = file.View.ReadUInt32 (index_offset+4+name_length);
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if (next_offset < offset)
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return null;
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entry.Size = next_offset - offset;
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entry.Offset = offset;
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if (offset < index_size || !entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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index_offset += 4;
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}
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return dir;
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}
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}
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}
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