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(Legacy): ABC images.
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morkt
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345
Legacy/Sarang/ImageABC.cs
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345
Legacy/Sarang/ImageABC.cs
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//! \file ImageABC.cs
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//! \date 2018 Sep 01
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//! \brief Sarang compressed bitmap.
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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.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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// [010928][Sarang] Rege ~Saisei no Ubugoe~
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namespace GameRes.Formats.Sarang
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{
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internal class AbcMetaData : ImageMetaData
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{
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public int UnpackedSize;
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public ImageFormat SourceFormat;
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public ImageMetaData SourceInfo;
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}
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[Export(typeof(ImageFormat))]
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public class AbcFormat : ImageFormat
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{
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public override string Tag { get { return "ABC"; } }
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public override string Description { get { return "Sarang compressed bitmap"; } }
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public override uint Signature { get { return 0; } }
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const int MinUnpackedSize = 0x38;
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const int MaxUnpackedSize = 4096 * 4096 * 4;
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static readonly ResourceInstance<ImageFormat> s_DdsFormat = new ResourceInstance<ImageFormat> ("DDS");
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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int unpacked_size = file.ReadInt32();
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if (unpacked_size < MinUnpackedSize || unpacked_size > MaxUnpackedSize)
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return null;
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uint signature = file.ReadUInt32();
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if ((signature & 0xFFFF) != 0x1321 && signature != 0x620A1122)
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return null;
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using (var reader = new AbcDecoder (file.AsStream, Math.Min (0x6C, unpacked_size)))
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{
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var data = reader.Unpack();
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ImageFormat format;
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if (data.AsciiEqual (0, "BM"))
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format = Bmp;
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else if (data.AsciiEqual (0, "DDS "))
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format = s_DdsFormat.Value;
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else
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return null;
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using (var input = new BinMemoryStream (data))
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{
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var info = format.ReadMetaData (input);
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if (null == info)
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return null;
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return new AbcMetaData {
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Width = info.Width,
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Height = info.Height,
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BPP = info.BPP,
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UnpackedSize = unpacked_size,
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SourceFormat = format,
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SourceInfo = info,
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};
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}
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}
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}
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public override ImageData Read (IBinaryStream file, ImageMetaData info)
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{
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var meta = (AbcMetaData)info;
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using (var reader = new AbcDecoder (file.AsStream, meta.UnpackedSize))
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{
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var data = reader.Unpack();
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using (var input = new BinMemoryStream (data))
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return meta.SourceFormat.Read (input, meta.SourceInfo);
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}
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}
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public override void Write (Stream file, ImageData image)
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{
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throw new System.NotImplementedException ("AbcFormat.Write not implemented");
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}
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}
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internal sealed class AbcDecoder : IDisposable
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{
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MsbBitStream m_input;
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byte[] m_output;
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byte[] m_root = new byte[0x1000];
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int[] m_dict1 = new int[0x1000];
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int[] m_dict2 = new int[0x1000];
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int[] m_dict3 = new int[0x1000];
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int[] m_dict4 = new int[0x1000];
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int m_last_token;
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int[] m_table1 = new int[0x1000];
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int[] m_table2 = new int[0x1000];
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int m_field_4;
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int m_field_8;
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int[] m_buffer = new int[MaxStringLength];
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int m_token_bits;
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int m_token_limit;
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const int MaxStringLength = 100;
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public AbcDecoder (Stream input, int unpacked_size)
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{
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m_input = new MsbBitStream (input, true);
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m_output = new byte[unpacked_size];
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}
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void InitDecoder ()
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{
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m_input.Input.Position = 4;
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m_last_token = 256;
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m_field_4 = 0x1000;
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m_field_8 = 0x1000;
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m_token_bits = 1;
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m_token_limit = 2;
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for (int i = 0; i < 0x100; ++i)
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{
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m_root[i] = (byte)i;
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m_dict1[i] = 0x1000;
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m_dict2[i] = 0x1000;
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m_dict3[i] = 0x1000;
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m_dict4[i] = 0x1000;
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}
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}
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public byte[] Unpack ()
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{
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InitDecoder();
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int prev_count = 0;
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int prev_token = 0x1000;
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int dst = 0;
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while (dst < m_output.Length)
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{
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int current_token = ReadToken();
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int count = 0;
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int pos = MaxStringLength;
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for (int token = current_token; token != 0x1000; token = m_dict1[token])
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{
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if (token >= 256 && token != m_field_4)
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{
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sub_411760 (token);
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sub_4117B0 (token, m_field_4);
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}
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m_buffer[--pos] = m_root[token];
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++count;
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}
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int src = MaxStringLength - count;
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int copy_count = Math.Min (count, m_output.Length - dst);
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for (int i = 0; i < copy_count; ++i)
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{
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m_output[dst++] = (byte)m_buffer[src++];
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}
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if (dst >= m_output.Length)
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break;
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sub_4118F0 (MaxStringLength - count, count, prev_token, prev_count);
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prev_token = current_token;
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prev_count = count;
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}
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return m_output;
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}
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void sub_411760 (int token)
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{
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if (token == m_field_8)
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{
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m_field_8 = m_table1[token];
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m_table2[m_field_8] = 0x1000;
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}
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else
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{
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int t1 = m_table1[token];
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int t2 = m_table2[token];
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m_table1[t2] = t1;
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m_table2[t1] = t2;
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}
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}
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void sub_4117B0 (int a2, int a3)
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{
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int v3 = m_field_4;
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if (v3 == 0x1000)
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{
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m_table1[a2] = 0x1000;
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m_table2[a2] = 0x1000;
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m_field_8 = a2;
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m_field_4 = a2;
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}
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else if (a3 == 0x1000)
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{
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m_table2[a2] = 0x1000;
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m_table1[a2] = m_field_8;
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m_table2[m_field_8] = a2;
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m_field_8 = a2;
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}
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else if (a3 == v3)
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{
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m_table2[a2] = v3;
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m_table1[a2] = 0x1000;
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m_table1[m_field_4] = a2;
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m_field_4 = a2;
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}
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else
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{
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m_table2[a2] = a3;
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int t1 = m_table1[a3];
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m_table1[a2] = t1;
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m_table2[t1] = a2;
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m_table1[a3] = a2;
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}
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}
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int sub_411870 (int prev_token, int symbol)
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{
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int token = m_dict2[prev_token];
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while (token != 0x1000 && symbol != m_root[token])
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{
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token = m_dict3[token];
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}
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return token;
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}
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void sub_4118F0 (int src, int count, int prev_token, int prev_count)
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{
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if (prev_token == 0x1000)
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return;
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for (int i = 0; i < count; ++i)
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{
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if (++prev_count > MaxStringLength)
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break;
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int symbol = m_buffer[src];
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int token = sub_411870 (prev_token, symbol);
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if (token == 0x1000)
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{
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token = m_last_token;
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if (token >= 0x1000)
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{
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token = m_field_8;
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if (prev_token == token)
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return;
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sub_411760 (m_field_8);
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sub_411A40 (token);
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}
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else
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{
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m_last_token = token + 1;
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}
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sub_4119E0 (prev_token, token, (byte)symbol);
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if (prev_token >= 256)
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sub_4117B0 (token, m_table2[prev_token]);
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else
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sub_4117B0 (token, m_field_4);
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}
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prev_token = token;
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++src;
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}
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}
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void sub_4119E0 (int prev_token, int token, byte symbol)
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{
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m_root[token] = symbol;
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m_dict1[token] = prev_token;
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m_dict2[token] = 0x1000;
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m_dict4[token] = 0x1000;
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int d2 = m_dict2[prev_token];
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m_dict3[token] = d2;
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if (d2 != 0x1000)
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m_dict4[d2] = token;
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m_dict2[prev_token] = token;
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}
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void sub_411A40 (int a2)
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{
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int d4 = m_dict4[a2];
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int d3 = m_dict3[a2];
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if (d4 == 0x1000)
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m_dict2[m_dict1[a2]] = d3;
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else
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m_dict3[d4] = d3;
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if (d3 != 0x1000)
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m_dict4[d3] = d4;
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}
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int ReadToken ()
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{
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if (m_last_token - 256 >= m_token_limit)
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{
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m_token_limit <<= 1;
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m_token_bits += 1;
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}
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int token = m_input.GetNextBit();
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if (token > 0)
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{
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token = m_input.GetBits (m_token_bits);
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if (token != -1)
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token += 256;
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}
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else if (0 == token)
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{
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token = m_input.GetBits (8);
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}
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return token;
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}
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#region IDisposable Members
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bool m_disposed = false;
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public void Dispose ()
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{
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if (!m_disposed)
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{
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m_input.Dispose();
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m_disposed = true;
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}
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}
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#endregion
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}
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}
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