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122 lines
4.7 KiB
C#
122 lines
4.7 KiB
C#
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//! \file ArcSDA.cs
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//! \date 2023 Sep 26
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//! \brief Squadra D resource archive format.
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//
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// Copyright (C) 2023 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.SquadraD
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{
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[Export(typeof(ArchiveFormat))]
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public class SdaOpener : ArchiveFormat
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{
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public override string Tag => "SDA/SD";
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public override string Description => "Squadra D resource archive";
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public override uint Signature => 0x4153; // 'SA'
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public override bool IsHierarchic => false;
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public override bool CanWrite => false;
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public SdaOpener ()
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{
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Signatures = new[] { 0x4153u, 0xCC004153u, 0u };
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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, "SA\0"))
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return null;
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int data_offset = file.View.ReadInt32 (4);
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if (data_offset <= 8 || data_offset >= file.MaxOffset)
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return null;
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int count = (data_offset - 8) / 0x14;
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if (!IsSaneCount (count))
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return null;
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string arc_name = Path.GetFileNameWithoutExtension (file.Name);
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bool is_cg = arc_name == "g";
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uint index = 8;
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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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var name = file.View.ReadString (index, 0x10).Trim();;
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var entry = Create<Entry> (name);
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entry.Offset = file.View.ReadUInt32 (index+0xC) + data_offset;
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entry.Size = file.View.ReadUInt32 (index+0x10);
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if (is_cg)
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entry.Type = "image";
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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 += 0x14;
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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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using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
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{
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var data = LzssDecompress (input);
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return new BinMemoryStream (data, entry.Name);
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}
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}
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internal static byte[] LzssDecompress (IBinaryStream input)
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{
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int unpacked_size = input.ReadInt32();
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var output = new byte[unpacked_size];
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using (var bits = new LsbBitStream (input.AsStream, true))
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{
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var frame = new byte[0x1000];
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int frame_pos = 0xFC0;
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int dst = 0;
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while (dst < unpacked_size)
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{
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if (bits.GetNextBit() == 0)
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{
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byte b = (byte)bits.GetBits (8);
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output[dst++] = frame[frame_pos++ & 0xFFF] = b;
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}
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else
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{
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int count_len = 4;
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if (bits.GetNextBit() != 0)
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count_len = 6;
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int offset = bits.GetBits (12);
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int count = bits.GetBits (count_len);
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count = Math.Min (count + 3, unpacked_size - dst);
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while (count --> 0)
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{
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byte b = frame[offset++ & 0xFFF];
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output[dst++] = frame[frame_pos++ & 0xFFF] = b;
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}
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}
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}
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return output;
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}
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}
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}
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}
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