source: OniSplit/Imaging/DdsReader.cs

using System;
using System.Collections.Generic;

namespace Oni.Imaging
{
        internal static class DdsReader
        {
                public static List<Surface> Read(string filePath, bool noMipMaps)
                {
            var surfaces = new List<Surface>();

            using (var reader = new BinaryReader(filePath))
                        {
                var header = DdsHeader.Read(reader);
                                var format = header.GetSurfaceFormat();

                                for (int i = 0; i < header.MipmapCount; i++)
                                {
                                        int width = Math.Max(header.Width >> i, 1);
                                        int height = Math.Max(header.Height >> i, 1);

                                        if (format == SurfaceFormat.DXT1)
                                        {
                                                width = Math.Max(width, 4);
                                                height = Math.Max(height, 4);
                                        }

                    var surface = new Surface(width, height, format);
                                        reader.Read(surface.Data, 0, surface.Data.Length);
                                        surfaces.Add(surface);

                    if (noMipMaps)
                        break;
                                }
                        }

                        return surfaces;
                }
        }
}