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BspReader.cs
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BspReader.cs
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using System;
using System.IO;
using Toe.Utils.Mesh.Bsp.HL2;
using Toe.Utils.Mesh.Bsp.Q3;
namespace Toe.Utils.Mesh.Bsp
{
public class BspReader : ISceneReader
{
private readonly IStreamConverterFactory streamConverterFactory;
public BspReader(IStreamConverterFactory streamConverterFactory)
{
this.streamConverterFactory = streamConverterFactory;
}
#region Public Methods and Operators
/// <summary>
/// Load mesh from stream.
/// </summary>
/// <param name="stream">Stream to read from.</param>
/// <param name="basePath"> </param>
/// <returns>Complete parsed mesh.</returns>
public IScene Load(Stream stream, string basePath)
{
var pos = stream.Position;
var magic = stream.ReadUInt32();
IBspReader reader = null;
if (magic == 0x1D)
{
reader = new Q1.BspReader(streamConverterFactory);
}
else if (magic == 0x1E)
{
reader = new HL1.BspReader(streamConverterFactory);
}
else if (magic == 0x50534256)
{
magic = stream.ReadUInt32();
if (magic == 17)
{
reader = new BspReader17(streamConverterFactory);
}
else if (magic == 19)
{
reader = new BspReader19(streamConverterFactory);
}
else if (magic == 20)
{
reader = new BspReader20(streamConverterFactory);
}
else if (magic == 21)
{
reader = new BspReader21(streamConverterFactory);
}
else
{
throw new BspFormatException("Unknown Source Engine BSP: " + magic);
}
}
else if (magic == 0x50534249)
{
magic = stream.ReadUInt32();
if (magic == 0x26)
{
reader = new Q2.BspReader(streamConverterFactory);
}
else if (magic == 0x2E)
{
reader = new Q3.BspReader(streamConverterFactory);
}
else if (magic == 0x2F)
{
reader = new QLiveBspReader(streamConverterFactory);
}
else
{
throw new BspFormatException(string.Format("Unknown Quake 3 BSP: {0}", magic));
}
}
stream.Position = pos;
reader.Stream = stream;
reader.GameRootPath = EvalGameRootPath(stream);
return reader.LoadScene();
}
#endregion
#region Methods
private static string EvalGameRootPath(Stream stream)
{
var fileStream = stream as FileStream;
if (fileStream == null)
{
return Directory.GetCurrentDirectory();
}
var name = Path.GetDirectoryName(Path.GetFullPath(fileStream.Name));
var gameRoot = name;
for (;;)
{
var root = Path.GetDirectoryName(gameRoot);
if (root == null)
{
return name;
}
if (string.Compare(Path.GetFileName(gameRoot), "maps", StringComparison.InvariantCultureIgnoreCase) == 0)
{
return root;
}
gameRoot = root;
}
}
#endregion
}
}