mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
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434 lines
11 KiB
JavaScript
434 lines
11 KiB
JavaScript
/**
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* @author aleeper / http://adamleeper.com/
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* @author mrdoob / http://mrdoob.com/
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* @author gero3 / https://github.com/gero3
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*
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* Description: A THREE loader for STL ASCII files, as created by Solidworks and other CAD programs.
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*
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* Supports both binary and ASCII encoded files, with automatic detection of type.
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*
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* Limitations:
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* Binary decoding supports "Magics" color format (http://en.wikipedia.org/wiki/STL_(file_format)#Color_in_binary_STL).
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* There is perhaps some question as to how valid it is to always assume little-endian-ness.
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* ASCII decoding assumes file is UTF-8. Seems to work for the examples...
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*
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* Usage:
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* var loader = new THREE.STLLoader();
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* loader.load( './models/stl/slotted_disk.stl', function ( geometry ) {
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* scene.add( new THREE.Mesh( geometry ) );
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* });
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*
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* For binary STLs geometry might contain colors for vertices. To use it:
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* // use the same code to load STL as above
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* if (geometry.hasColors) {
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* material = new THREE.MeshPhongMaterial({ opacity: geometry.alpha, vertexColors: THREE.VertexColors });
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* } else { .... }
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* var mesh = new THREE.Mesh( geometry, material );
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*/
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THREE.STLLoader = function ( manager ) {
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this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
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};
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THREE.STLLoader.prototype = {
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constructor: THREE.STLLoader,
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load: function ( url, onLoad, onProgress, onError ) {
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var scope = this;
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var loader = new THREE.XHRLoader( scope.manager );
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loader.setCrossOrigin( this.crossOrigin );
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loader.setResponseType('arraybuffer');
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loader.load( url, function ( text ) {
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onLoad( scope.parse( text ) );
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}, onProgress, onError );
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},
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parse: function ( data ) {
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var isBinary = function () {
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var expect, face_size, n_faces, reader;
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reader = new DataView( binData );
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face_size = (32 / 8 * 3) + ((32 / 8 * 3) * 3) + (16 / 8);
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n_faces = reader.getUint32(80, true);
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expect = 80 + (32 / 8) + (n_faces * face_size);
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if ( expect === reader.byteLength ) {
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return true;
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}
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// some binary files will have different size from expected,
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// checking characters higher than ASCII to confirm is binary
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var fileLength = reader.byteLength;
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for ( var index = 0; index < fileLength; index ++ ) {
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if ( reader.getUint8(index, false) > 127 ) {
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return true;
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}
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}
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return false;
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};
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var binData = this.ensureBinary( data );
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return isBinary()
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? this.parseBinary( binData )
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: this.parseASCII( this.ensureString( data ) );
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},
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parseBinary: function ( data ) {
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var reader = new DataView( data );
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var faces = reader.getUint32( 80, true );
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var r, g, b, hasColors = false, colors;
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var defaultR, defaultG, defaultB, alpha;
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// process STL header
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// check for default color in header ("COLOR=rgba" sequence).
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for ( var index = 0; index < 80 - 10; index ++ ) {
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if ((reader.getUint32(index, false) == 0x434F4C4F /*COLO*/) &&
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(reader.getUint8(index + 4) == 0x52 /*'R'*/) &&
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(reader.getUint8(index + 5) == 0x3D /*'='*/)) {
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hasColors = true;
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colors = new Float32Array( faces * 3 * 3);
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defaultR = reader.getUint8(index + 6) / 255;
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defaultG = reader.getUint8(index + 7) / 255;
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defaultB = reader.getUint8(index + 8) / 255;
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alpha = reader.getUint8(index + 9) / 255;
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}
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}
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var dataOffset = 84;
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var faceLength = 12 * 4 + 2;
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var offset = 0;
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var geometry = new THREE.BufferGeometry();
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var vertices = new Float32Array( faces * 3 * 3 );
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var normals = new Float32Array( faces * 3 * 3 );
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for ( var face = 0; face < faces; face ++ ) {
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var start = dataOffset + face * faceLength;
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var normalX = reader.getFloat32(start, true);
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var normalY = reader.getFloat32(start + 4, true);
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var normalZ = reader.getFloat32(start + 8, true);
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if (hasColors) {
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var packedColor = reader.getUint16(start + 48, true);
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if ((packedColor & 0x8000) === 0) { // facet has its own unique color
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r = (packedColor & 0x1F) / 31;
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g = ((packedColor >> 5) & 0x1F) / 31;
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b = ((packedColor >> 10) & 0x1F) / 31;
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} else {
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r = defaultR;
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g = defaultG;
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b = defaultB;
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}
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}
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for ( var i = 1; i <= 3; i ++ ) {
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var vertexstart = start + i * 12;
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vertices[ offset ] = reader.getFloat32( vertexstart, true );
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vertices[ offset + 1 ] = reader.getFloat32( vertexstart + 4, true );
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vertices[ offset + 2 ] = reader.getFloat32( vertexstart + 8, true );
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normals[ offset ] = normalX;
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normals[ offset + 1 ] = normalY;
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normals[ offset + 2 ] = normalZ;
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if (hasColors) {
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colors[ offset ] = r;
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colors[ offset + 1 ] = g;
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colors[ offset + 2 ] = b;
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}
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offset += 3;
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}
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}
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geometry.addAttribute( 'position', new THREE.BufferAttribute( vertices, 3 ) );
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geometry.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );
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if (hasColors) {
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geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
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geometry.hasColors = true;
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geometry.alpha = alpha;
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}
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return geometry;
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},
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parseASCII: function ( data ) {
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var geometry, length, normal, patternFace, patternNormal, patternVertex, result, text;
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geometry = new THREE.Geometry();
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patternFace = /facet([\s\S]*?)endfacet/g;
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while ( ( result = patternFace.exec( data ) ) !== null ) {
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text = result[0];
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patternNormal = /normal[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g;
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while ( ( result = patternNormal.exec( text ) ) !== null ) {
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normal = new THREE.Vector3( parseFloat( result[ 1 ] ), parseFloat( result[ 3 ] ), parseFloat( result[ 5 ] ) );
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}
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patternVertex = /vertex[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g;
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while ( ( result = patternVertex.exec( text ) ) !== null ) {
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geometry.vertices.push( new THREE.Vector3( parseFloat( result[ 1 ] ), parseFloat( result[ 3 ] ), parseFloat( result[ 5 ] ) ) );
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}
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length = geometry.vertices.length;
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geometry.faces.push( new THREE.Face3( length - 3, length - 2, length - 1, normal ) );
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}
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geometry.computeBoundingBox();
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geometry.computeBoundingSphere();
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return geometry;
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},
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ensureString: function ( buf ) {
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if (typeof buf !== "string") {
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var array_buffer = new Uint8Array(buf);
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var str = '';
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for (var i = 0; i < buf.byteLength; i ++) {
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str += String.fromCharCode(array_buffer[i]); // implicitly assumes little-endian
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}
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return str;
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} else {
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return buf;
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}
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},
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ensureBinary: function ( buf ) {
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if (typeof buf === "string") {
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var array_buffer = new Uint8Array(buf.length);
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for (var i = 0; i < buf.length; i ++) {
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array_buffer[i] = buf.charCodeAt(i) & 0xff; // implicitly assumes little-endian
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}
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return array_buffer.buffer || array_buffer;
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} else {
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return buf;
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}
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}
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};
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if ( typeof DataView === 'undefined') {
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DataView = function(buffer, byteOffset, byteLength) {
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this.buffer = buffer;
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this.byteOffset = byteOffset || 0;
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this.byteLength = byteLength || buffer.byteLength || buffer.length;
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this._isString = typeof buffer === "string";
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}
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DataView.prototype = {
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_getCharCodes:function(buffer,start,length) {
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start = start || 0;
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length = length || buffer.length;
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var end = start + length;
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var codes = [];
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for (var i = start; i < end; i ++) {
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codes.push(buffer.charCodeAt(i) & 0xff);
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}
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return codes;
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},
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_getBytes: function (length, byteOffset, littleEndian) {
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var result;
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// Handle the lack of endianness
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if (littleEndian === undefined) {
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littleEndian = this._littleEndian;
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}
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// Handle the lack of byteOffset
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if (byteOffset === undefined) {
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byteOffset = this.byteOffset;
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} else {
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byteOffset = this.byteOffset + byteOffset;
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}
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if (length === undefined) {
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length = this.byteLength - byteOffset;
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}
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// Error Checking
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if (typeof byteOffset !== 'number') {
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throw new TypeError('DataView byteOffset is not a number');
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}
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if (length < 0 || byteOffset + length > this.byteLength) {
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throw new Error('DataView length or (byteOffset+length) value is out of bounds');
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}
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if (this.isString) {
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result = this._getCharCodes(this.buffer, byteOffset, byteOffset + length);
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} else {
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result = this.buffer.slice(byteOffset, byteOffset + length);
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}
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if (!littleEndian && length > 1) {
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if (!(result instanceof Array)) {
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result = Array.prototype.slice.call(result);
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}
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result.reverse();
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}
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return result;
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},
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// Compatibility functions on a String Buffer
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getFloat64: function (byteOffset, littleEndian) {
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var b = this._getBytes(8, byteOffset, littleEndian),
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sign = 1 - (2 * (b[7] >> 7)),
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exponent = ((((b[7] << 1) & 0xff) << 3) | (b[6] >> 4)) - ((1 << 10) - 1),
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// Binary operators such as | and << operate on 32 bit values, using + and Math.pow(2) instead
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mantissa = ((b[6] & 0x0f) * Math.pow(2, 48)) + (b[5] * Math.pow(2, 40)) + (b[4] * Math.pow(2, 32)) +
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(b[3] * Math.pow(2, 24)) + (b[2] * Math.pow(2, 16)) + (b[1] * Math.pow(2, 8)) + b[0];
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if (exponent === 1024) {
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if (mantissa !== 0) {
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return NaN;
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} else {
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return sign * Infinity;
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}
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}
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if (exponent === -1023) { // Denormalized
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return sign * mantissa * Math.pow(2, -1022 - 52);
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}
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return sign * (1 + mantissa * Math.pow(2, -52)) * Math.pow(2, exponent);
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},
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getFloat32: function (byteOffset, littleEndian) {
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var b = this._getBytes(4, byteOffset, littleEndian),
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sign = 1 - (2 * (b[3] >> 7)),
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exponent = (((b[3] << 1) & 0xff) | (b[2] >> 7)) - 127,
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mantissa = ((b[2] & 0x7f) << 16) | (b[1] << 8) | b[0];
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if (exponent === 128) {
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if (mantissa !== 0) {
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return NaN;
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} else {
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return sign * Infinity;
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}
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}
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if (exponent === -127) { // Denormalized
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return sign * mantissa * Math.pow(2, -126 - 23);
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}
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return sign * (1 + mantissa * Math.pow(2, -23)) * Math.pow(2, exponent);
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},
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getInt32: function (byteOffset, littleEndian) {
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var b = this._getBytes(4, byteOffset, littleEndian);
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return (b[3] << 24) | (b[2] << 16) | (b[1] << 8) | b[0];
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},
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getUint32: function (byteOffset, littleEndian) {
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return this.getInt32(byteOffset, littleEndian) >>> 0;
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},
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getInt16: function (byteOffset, littleEndian) {
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return (this.getUint16(byteOffset, littleEndian) << 16) >> 16;
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},
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getUint16: function (byteOffset, littleEndian) {
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var b = this._getBytes(2, byteOffset, littleEndian);
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return (b[1] << 8) | b[0];
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},
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getInt8: function (byteOffset) {
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return (this.getUint8(byteOffset) << 24) >> 24;
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},
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getUint8: function (byteOffset) {
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return this._getBytes(1, byteOffset)[0];
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}
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};
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}
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