mirror of
https://github.com/crskycode/GARbro.git
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140 lines
5.3 KiB
C#
140 lines
5.3 KiB
C#
//! \file ArcSKA.cs
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//! \date 2022 Jun 12
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//! \brief Sohfu resource archive.
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//
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// Copyright (C) 2022 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 GameRes.Utility;
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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.Sohfu
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{
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[Export(typeof(ArchiveFormat))]
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public class SkaOpener : ArchiveFormat
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{
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public override string Tag { get { return "SKA/SOHFU"; } }
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public override string Description { get { return "Sohfu resource archive"; } }
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public override uint Signature { get { return 0x32465049; } } // 'IPF2'
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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 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 index_pos = 8;
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var name_buffer = new byte[0x10];
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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 (index_pos, name_buffer, 0, 0x10);
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int name_len = 0;
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while (name_len < name_buffer.Length && name_buffer[name_len] != 0)
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++name_len;
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var name = Encodings.cp932.GetString (name_buffer, 0, name_len);
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++name_len;
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string ext = null;
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if (name_len < 0x10)
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ext = Binary.GetCString (name_buffer, name_len, 0x10 - name_len);
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if (!string.IsNullOrEmpty (ext))
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name = Path.ChangeExtension (name, ext);
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var entry = Create<PackedEntry> (name);
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entry.Offset = file.View.ReadUInt32 (index_pos+0x10);
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entry.Size = file.View.ReadUInt32 (index_pos+0x14);
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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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index_pos += 0x18;
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}
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return new ArcFile (file, this, dir);
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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 pent = (PackedEntry)entry;
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var input = arc.File.CreateStream (entry.Offset, entry.Size);
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if (!pent.IsPacked)
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{
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if (input.Signature != 0x4238534C) // 'LS8B'
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return input;
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pent.IsPacked = true;
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pent.UnpackedSize = arc.File.View.ReadUInt32 (pent.Offset+4);
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}
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using (input)
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{
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var data = new byte[pent.UnpackedSize];
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input.Position = 0xC;
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LzssUnpack (input, data);
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return new BinMemoryStream (data);
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}
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}
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void LzssUnpack (IBinaryStream input, byte[] output)
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{
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byte[] frame = new byte[0x1000];
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int frame_pos = 0xFFF;
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const int frame_mask = 0xFFF;
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int ctl = 1;
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int dst = 0;
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while (dst < output.Length)
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{
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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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frame[++frame_pos & frame_mask] = (byte)b;
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output[dst++] = (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 << 4 | lo >> 4;
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for (int count = 3 + (lo & 0xF); count != 0; --count)
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{
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byte v = frame[(offset + frame_pos++ - 0xFFF) & 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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ctl >>= 1;
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}
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}
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}
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}
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