implemented SCP images.

2024-11-23 05:35:34 +08:00 · 2018-12-29 22:24:34 +04:00 · 2018-12-29 22:24:34 +04:00 · 91f63aacbc
commit 91f63aacbc
parent 935cd54439
1 changed files with 122 additions and 0 deletions
--- a/ArcFormats/Scoop/ImageSCP.cs
+++ b/ArcFormats/Scoop/ImageSCP.cs
@ -0,0 +1,122 @@
+//! \file       ImageSCP.cs
+//! \date       2018 Dec 27
+//! \brief      Scoop compressed bitmap.
+//
+// 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 GameRes.Utility;
+
+namespace GameRes.Formats.Scoop
+{
+    [Export(typeof(ImageFormat))]
+    public class ScpFormat : ImageFormat
+    {
+        public override string         Tag { get { return "SCP"; } }
+        public override string Description { get { return "Scoop compressed bitmap"; } }
+        public override uint     Signature { get { return 0x7A504353; } } // 'SCPz'
+
+        public ScpFormat ()
+        {
+            Extensions = new string[] { };
+        }
+
+        const uint DefaultHeaderKey = 0x65641538;
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            file.Position = 4;
+            uint length = file.ReadUInt32() ^ DefaultHeaderKey;
+            if (length <= 0)
+                return null;
+            var header = new byte[0x36];
+            Unpack (file, header);
+            if (!header.AsciiEqual ("BM"))
+                return null;
+            using (var bmp = new BinMemoryStream (header))
+            {
+                var info = Bmp.ReadMetaData (bmp) as BmpMetaData;
+                if (info != null)
+                    info.ImageLength = length;
+                return info;
+            }
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            var meta = (BmpMetaData)info;
+            var data = new byte[meta.ImageLength];
+            file.Position = 8;
+            Unpack (file, data);
+            using (var bmp = new BinMemoryStream (data))
+                return Bmp.Read (bmp, info);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("ScpFormat.Write not implemented");
+        }
+
+        internal void Unpack (IBinaryStream input, byte[] output)
+        {
+            uint bits = 0;
+            int dst = 0;
+            byte v = 0x7F;
+            byte x = 0;
+            while (dst < output.Length)
+            {
+                uint ctl = bits >> 31;
+                bits <<= 1;
+                if (0 == bits)
+                {
+                    bits = input.ReadUInt32();
+                    continue;
+                }
+                if (0 == ctl)
+                {
+                    x = v;
+                    v ^= input.ReadUInt8();
+                    output[dst++] = v;
+                }
+                else
+                {
+                    ushort z = input.ReadUInt16();
+                    z += (ushort)bits;
+                    int count = (z >> 12) & 0xF;
+                    if (0 == count)
+                    {
+                        count = (x + input.ReadUInt8()) & 0xFF;
+                        if (0 == count)
+                            break;
+                        count += 15;
+                    }
+                    int offset = ~(z & 0xFFF);
+                    count = Math.Min (count + 2, output.Length - dst);
+                    Binary.CopyOverlapped (output, dst + offset, dst, count);
+                    dst += count;
+                }
+            }
+        }
+    }
+}