81 lines
1.9 KiB
C#
81 lines
1.9 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see COPYING.
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*/
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#endregion
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using System.Drawing;
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using System.IO;
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using OpenRA.FileFormats;
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namespace OpenRA.Graphics
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{
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// TODO: Most of this should be moved into the format parsers themselves.
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public enum SpriteType { Unknown, ShpD2 }
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public static class SpriteSource
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{
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static bool IsShpD2(Stream s)
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{
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var start = s.Position;
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// First word is the image count
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var imageCount = s.ReadUInt16();
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if (imageCount == 0)
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{
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s.Position = start;
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return false;
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}
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// Test for two vs four byte offset
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var testOffset = s.ReadUInt32();
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var offsetSize = (testOffset & 0xFF0000) > 0 ? 2 : 4;
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// Last offset should point to the end of file
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var finalOffset = start + 2 + offsetSize * imageCount;
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if (finalOffset > s.Length)
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{
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s.Position = start;
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return false;
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}
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s.Position = finalOffset;
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var eof = offsetSize == 2 ? s.ReadUInt16() : s.ReadUInt32();
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if (eof + 2 != s.Length)
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{
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s.Position = start;
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return false;
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}
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// Check the format flag on the first frame
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var b = s.ReadUInt16();
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s.Position = start;
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return b == 5 || b <= 3;
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}
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public static SpriteType DetectSpriteType(Stream s)
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{
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if (IsShpD2(s))
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return SpriteType.ShpD2;
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return SpriteType.Unknown;
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}
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public static ISpriteSource LoadSpriteSource(Stream s, string filename)
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{
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var type = DetectSpriteType(s);
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switch (type)
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{
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case SpriteType.ShpD2:
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return new ShpD2Reader(s);
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case SpriteType.Unknown:
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default:
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throw new InvalidDataException(filename + " is not a valid sprite file");
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}
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}
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}
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}
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