From 7dad7b1dbe1f5b52b2cea41849c549fcb6dde8a8 Mon Sep 17 00:00:00 2001
From: morkt <morkt@users.noreply.github.com>
Date: Sun, 15 Jul 2018 00:15:52 +0400
Subject: [PATCH] (Legacy): HHP images.

---
 Legacy/MayBeSoft/ImageHHP.cs | 144 +++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 Legacy/MayBeSoft/ImageHHP.cs

diff --git a/Legacy/MayBeSoft/ImageHHP.cs b/Legacy/MayBeSoft/ImageHHP.cs
new file mode 100644
index 00000000..321f9c7d
--- /dev/null
+++ b/Legacy/MayBeSoft/ImageHHP.cs
@@ -0,0 +1,144 @@
+//! \file       ImageHHP.cs
+//! \date       2018 Jul 07
+//! \brief      May-Be Soft image format.
+//
+// Copyright (C) 2018 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+// [960920][May-Be Soft] Blind Games
+
+namespace GameRes.Formats.MayBeSoft
+{
+    [Export(typeof(ImageFormat))]
+    public class HhpFormat : ImageFormat
+    {
+        public override string         Tag { get { return "HHP"; } }
+        public override string Description { get { return "May-Be Soft image format"; } }
+        public override uint     Signature { get { return 0; } }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            if (!file.Name.HasExtension ("HHP"))
+                return null;
+            return new ImageMetaData { Width = 640, Height = 400, BPP = 8 };
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            using (var reader = new HhpReader (file, info))
+            {
+                var pixels = reader.Unpack();
+                return ImageData.CreateFlipped (info, reader.Format, reader.Palette, pixels, reader.Stride);
+            }
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("HhpFormat.Write not implemented");
+        }
+    }
+
+    internal class HhpReader : IDisposable
+    {
+        MsbBitStream    m_input;
+        byte[]          m_output;
+        int             m_stride;
+
+        public PixelFormat    Format { get { return PixelFormats.Indexed8; } }
+        public int            Stride { get { return m_stride; } }
+        public BitmapPalette Palette { get; private set; }
+
+        public HhpReader (IBinaryStream input, ImageMetaData info)
+        {
+            m_input = new MsbBitStream (input.AsStream, true);
+            m_output = new byte[info.Width * info.Height];
+            m_stride = (int)info.Width;
+        }
+
+        public byte[] Unpack ()
+        {
+            Palette = ImageFormat.ReadPalette (m_input.Input, 0x100, PaletteFormat.Rgb);
+            int dst = -1;
+            while (dst < m_output.Length)
+            {
+                int code = m_input.GetBits (2);
+                if (-1 == code)
+                    throw new InvalidFormatException();
+                int count = m_input.GetBits (LengthTable[code]);
+                if (0 == count)
+                    break;
+                dst += count;
+                byte pix = (byte)m_input.GetBits (8);
+                m_output[dst] = pix;
+                int pos = dst;
+                for (;;)
+                {
+                    code = m_input.GetBits (3);
+                    if (-1 == code)
+                        throw new InvalidFormatException();
+                    if (0 == code)
+                        break;
+                    if (6 == code)
+                    {
+                        code = m_input.GetBits (2);
+                        count = m_input.GetBits (LengthTable[code]);
+                        pos += m_stride * count;
+                    }
+                    else
+                    {
+                        pos += m_stride + SkipTable[code];
+                        m_output[pos] = pix;
+                    }
+                }
+            }
+            byte rep = 0;
+            for (int i = 0; i < m_output.Length; ++i)
+            {
+                if (m_output[i] == 0)
+                    m_output[i] = rep;
+                else if (m_output[i] == rep)
+                    m_output[i] = rep = 0;
+                else
+                    rep = m_output[i];
+            }
+            return m_output;
+        }
+
+        static readonly byte[] LengthTable = { 4, 6, 8, 0x14 };
+        static readonly sbyte[] SkipTable = { 0, 0, 1, -1, 2, -2 };
+
+        bool m_disposed = false;
+        public void Dispose ()
+        {
+            if (!m_disposed)
+            {
+                m_input.Dispose();
+                m_disposed = true;
+            }
+        }
+    }
+}