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93 lines
3.8 KiB
C#
93 lines
3.8 KiB
C#
//! \file ArcDRS.cs
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//! \date Thu Aug 21 06:11:09 2014
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//! \brief Digital Romance System 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.Linq;
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using System.Text;
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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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namespace GameRes.Formats.DRS
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{
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[Export(typeof(ArchiveFormat))]
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public class DrsOpener : ArchiveFormat
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{
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public override string Tag { get { return "DRS"; } }
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public override string Description { get { return "Digital Romance System resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanCreate { get { return false; } }
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public DrsOpener ()
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{
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Extensions = Enumerable.Empty<string>(); // DRS archives have no extensions
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (file.MaxOffset > uint.MaxValue)
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return null;
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int dir_size = file.View.ReadUInt16 (0);
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if (dir_size < 0x20 || 0 != (dir_size & 0xf) || dir_size + 2 >= file.MaxOffset)
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return null;
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byte first = file.View.ReadByte (2);
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if (0 == first)
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return null;
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file.View.Reserve (0, (uint)dir_size + 2);
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int dir_offset = 2;
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uint next_offset = file.View.ReadUInt32 (dir_offset+12);
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if (next_offset > file.MaxOffset || next_offset < dir_size+2)
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return null;
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var encoding = Encodings.cp932.WithFatalFallback();
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byte[] name_raw = new byte[12];
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int count = dir_size / 0x10 - 1;
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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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file.View.Read (dir_offset, name_raw, 0, 12);
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int name_length = name_raw.Length;
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while (name_length > 0 && 0 == name_raw[name_length-1])
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--name_length;
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if (0 == name_length)
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return null;
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uint offset = next_offset;
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dir_offset += 0x10;
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next_offset = file.View.ReadUInt32 (dir_offset+12);
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if (next_offset > file.MaxOffset || next_offset < offset)
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return null;
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string name = encoding.GetString (name_raw, 0, name_length).ToLowerInvariant();
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var entry = FormatCatalog.Instance.CreateEntry (name);
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entry.Offset = offset;
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entry.Size = next_offset - offset;
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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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