/*
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* @author mrdoob / http://mrdoob.com/
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*/
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THREE.DDSLoader = function () {
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this._parser = THREE.DDSLoader.parse;
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};
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THREE.DDSLoader.prototype = Object.create(THREE.CompressedTextureLoader.prototype);
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THREE.DDSLoader.prototype.constructor = THREE.DDSLoader;
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THREE.DDSLoader.parse = function (buffer, loadMipmaps) {
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var dds = { mipmaps: [], width: 0, height: 0, format: null, mipmapCount: 1 };
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// Adapted from @toji's DDS utils
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// https://github.com/toji/webgl-texture-utils/blob/master/texture-util/dds.js
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// All values and structures referenced from:
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// http://msdn.microsoft.com/en-us/library/bb943991.aspx/
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var DDS_MAGIC = 0x20534444;
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var DDSD_CAPS = 0x1,
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DDSD_HEIGHT = 0x2,
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DDSD_WIDTH = 0x4,
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DDSD_PITCH = 0x8,
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DDSD_PIXELFORMAT = 0x1000,
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DDSD_MIPMAPCOUNT = 0x20000,
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DDSD_LINEARSIZE = 0x80000,
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DDSD_DEPTH = 0x800000;
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var DDSCAPS_COMPLEX = 0x8,
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DDSCAPS_MIPMAP = 0x400000,
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DDSCAPS_TEXTURE = 0x1000;
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var DDSCAPS2_CUBEMAP = 0x200,
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DDSCAPS2_CUBEMAP_POSITIVEX = 0x400,
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DDSCAPS2_CUBEMAP_NEGATIVEX = 0x800,
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DDSCAPS2_CUBEMAP_POSITIVEY = 0x1000,
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DDSCAPS2_CUBEMAP_NEGATIVEY = 0x2000,
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DDSCAPS2_CUBEMAP_POSITIVEZ = 0x4000,
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DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x8000,
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DDSCAPS2_VOLUME = 0x200000;
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var DDPF_ALPHAPIXELS = 0x1,
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DDPF_ALPHA = 0x2,
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DDPF_FOURCC = 0x4,
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DDPF_RGB = 0x40,
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DDPF_YUV = 0x200,
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DDPF_LUMINANCE = 0x20000;
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function fourCCToInt32(value) {
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return value.charCodeAt(0) +
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(value.charCodeAt(1) << 8) +
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(value.charCodeAt(2) << 16) +
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(value.charCodeAt(3) << 24);
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}
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function int32ToFourCC(value) {
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return String.fromCharCode(
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value & 0xff,
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(value >> 8) & 0xff,
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(value >> 16) & 0xff,
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(value >> 24) & 0xff
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);
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}
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function loadARGBMip(buffer, dataOffset, width, height) {
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var dataLength = width * height * 4;
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var srcBuffer = new Uint8Array(buffer, dataOffset, dataLength);
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var byteArray = new Uint8Array(dataLength);
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var dst = 0;
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var src = 0;
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for (var y = 0; y < height; y++) {
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for (var x = 0; x < width; x++) {
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var b = srcBuffer[src]; src++;
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var g = srcBuffer[src]; src++;
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var r = srcBuffer[src]; src++;
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var a = srcBuffer[src]; src++;
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byteArray[dst] = r; dst++; //r
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byteArray[dst] = g; dst++; //g
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byteArray[dst] = b; dst++; //b
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byteArray[dst] = a; dst++; //a
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}
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}
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return byteArray;
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}
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var FOURCC_DXT1 = fourCCToInt32("DXT1");
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var FOURCC_DXT3 = fourCCToInt32("DXT3");
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var FOURCC_DXT5 = fourCCToInt32("DXT5");
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var FOURCC_ETC1 = fourCCToInt32("ETC1");
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var headerLengthInt = 31; // The header length in 32 bit ints
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// Offsets into the header array
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var off_magic = 0;
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var off_size = 1;
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var off_flags = 2;
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var off_height = 3;
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var off_width = 4;
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var off_mipmapCount = 7;
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var off_pfFlags = 20;
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var off_pfFourCC = 21;
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var off_RGBBitCount = 22;
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var off_RBitMask = 23;
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var off_GBitMask = 24;
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var off_BBitMask = 25;
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var off_ABitMask = 26;
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var off_caps = 27;
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var off_caps2 = 28;
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var off_caps3 = 29;
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var off_caps4 = 30;
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// Parse header
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var header = new Int32Array(buffer, 0, headerLengthInt);
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if (header[off_magic] !== DDS_MAGIC) {
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console.error('THREE.DDSLoader.parse: Invalid magic number in DDS header.');
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return dds;
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}
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if (!header[off_pfFlags] & DDPF_FOURCC) {
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console.error('THREE.DDSLoader.parse: Unsupported format, must contain a FourCC code.');
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return dds;
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}
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var blockBytes;
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var fourCC = header[off_pfFourCC];
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var isRGBAUncompressed = false;
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switch (fourCC) {
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case FOURCC_DXT1:
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blockBytes = 8;
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dds.format = THREE.RGB_S3TC_DXT1_Format;
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break;
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case FOURCC_DXT3:
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blockBytes = 16;
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dds.format = THREE.RGBA_S3TC_DXT3_Format;
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break;
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case FOURCC_DXT5:
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blockBytes = 16;
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dds.format = THREE.RGBA_S3TC_DXT5_Format;
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break;
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case FOURCC_ETC1:
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blockBytes = 8;
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dds.format = THREE.RGB_ETC1_Format;
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break;
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default:
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if (header[off_RGBBitCount] === 32
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&& header[off_RBitMask] & 0xff0000
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&& header[off_GBitMask] & 0xff00
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&& header[off_BBitMask] & 0xff
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&& header[off_ABitMask] & 0xff000000) {
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isRGBAUncompressed = true;
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blockBytes = 64;
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dds.format = THREE.RGBAFormat;
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} else {
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console.error('THREE.DDSLoader.parse: Unsupported FourCC code ', int32ToFourCC(fourCC));
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return dds;
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}
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}
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dds.mipmapCount = 1;
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if (header[off_flags] & DDSD_MIPMAPCOUNT && loadMipmaps !== false) {
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dds.mipmapCount = Math.max(1, header[off_mipmapCount]);
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}
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var caps2 = header[off_caps2];
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dds.isCubemap = caps2 & DDSCAPS2_CUBEMAP ? true : false;
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if (dds.isCubemap && (
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!(caps2 & DDSCAPS2_CUBEMAP_POSITIVEX) ||
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!(caps2 & DDSCAPS2_CUBEMAP_NEGATIVEX) ||
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!(caps2 & DDSCAPS2_CUBEMAP_POSITIVEY) ||
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!(caps2 & DDSCAPS2_CUBEMAP_NEGATIVEY) ||
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!(caps2 & DDSCAPS2_CUBEMAP_POSITIVEZ) ||
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!(caps2 & DDSCAPS2_CUBEMAP_NEGATIVEZ)
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)) {
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console.error('THREE.DDSLoader.parse: Incomplete cubemap faces');
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return dds;
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}
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dds.width = header[off_width];
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dds.height = header[off_height];
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var dataOffset = header[off_size] + 4;
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// Extract mipmaps buffers
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var faces = dds.isCubemap ? 6 : 1;
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for (var face = 0; face < faces; face++) {
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var width = dds.width;
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var height = dds.height;
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for (var i = 0; i < dds.mipmapCount; i++) {
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if (isRGBAUncompressed) {
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var byteArray = loadARGBMip(buffer, dataOffset, width, height);
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var dataLength = byteArray.length;
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} else {
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var dataLength = Math.max(4, width) / 4 * Math.max(4, height) / 4 * blockBytes;
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var byteArray = new Uint8Array(buffer, dataOffset, dataLength);
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}
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var mipmap = { "data": byteArray, "width": width, "height": height };
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dds.mipmaps.push(mipmap);
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dataOffset += dataLength;
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width = Math.max(width >> 1, 1);
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height = Math.max(height >> 1, 1);
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}
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}
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return dds;
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};
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