thematic-earth/gcslib/parsers/byte-encoded-parser.class.js

HTML-based, whole-Earth thematic maps using locally hosted data layers

/* Copyright (c) 2023 Read Write Tools. Legal use subject to the Thematic Earth Software License Agreement. */
import EncodedParser from'./encoded-parser.class.js';import*as SectionMarker from'../util/section-marker.js';import Coords from'../util/coords.class.js';import{Arc}from'../tae/topology.class.js';import{PolygonRing}from'../gcs/gcs-polygon-feature.class.js';import expect from'../softlib/expect.js';import aver from'../softlib/aver.js';import terminal from'../softlib/terminal.js';export default class ByteEncodedParser extends EncodedParser{constructor(e,t){expect(e,'GcsHoldingArea'),expect(t,'String'),super(e,t),Object.seal(this)}parse(e){return expect(e,'ArrayBuffer'),this.payload=new DataView(e),this.payloadLength=this.payload.byteLength,this.payloadOffset=0,super.parse(e)}readPayload(){var e=this.readMarker();switch(e){case SectionMarker.MERIDIANS[0]:this.numMeridians=this.readUint32(),this.readMeridians();break;case SectionMarker.PARALLELS[0]:this.numParallels=this.readUint32(),this.readParallels();break;case SectionMarker.COORDINATES[0]:this.numCoordinates=this.readUint32(),this.readCoordinates();break;case SectionMarker.ARCS[0]:this.numArcs=this.readUint32(),this.readArcs();break;case SectionMarker.DATASET[0]:this.datasetName=this.readLenPrefixedText();break;case SectionMarker.GEOMETRY[0]:this.geometryType=this.readLenPrefixedText();break;case SectionMarker.PROPERTIES[0]:this.numProperties=this.readUint8(),this.readProperties();break;case SectionMarker.FEATURES[0]:this.numFeatures=this.readUint32(),this.readFeatures();break;case SectionMarker.END[0]:return!1;default:return terminal.abnormal(`unexpected marker, got ${e.toString('16').padStart(8,'0')}`),!1}return!0}readMeridians(){expect(this.numMeridians,'Number'),aver(this.numMeridians>=0);for(let t=0;t<this.numMeridians;t++){if('icebin'!=this.format)return terminal.logic(`Geoplex Feature Encoding (GFE) must not have a meridians section ${this.url}`),!1;var e=Math.fround(this.readFloat32());this.indexedCoordinates.registerLongitude(e)}return aver(this.numMeridians==this.indexedCoordinates.meridians.length),!0}readParallels(){expect(this.numParallels,'Number'),aver(this.numParallels>=0);for(let t=0;t<this.numParallels;t++){if('icebin'!=this.format)return terminal.logic(`Geoplex Feature Encoding (GFE) must not have a parallels section ${this.url}`),!1;var e=Math.fround(this.readFloat32());this.indexedCoordinates.registerLatitude(e)}return aver(this.numParallels==this.indexedCoordinates.parallels.length),!0}readCoordinates(){if(expect(this.numCoordinates,'Number'),aver(this.numCoordinates>=0),'taebin'!=this.format)return terminal.logic(`Only Topological Arc Encoding(TAEBIN) expects a coordinates section ${this.url}`),!1;for(let s=0;s<this.numCoordinates;s++){var e=Math.fround(this.readFloat32()),t=Math.fround(this.readFloat32()),r=new Coords(e,t);this.topology.taeCoords.addVertex(r)}return aver(this.numCoordinates==this.topology.taeCoords.length-1),!0}readArcs(){if(expect(this.numArcs,'Number'),aver(this.numArcs>=0),'taebin'!=this.format)return terminal.logic(`Only Topological Arc Encoding(TAEBIN) expects an arc section ${this.url}`),!1;this.determineBitsNeededForArcs();for(let t=0;t<this.numArcs;t++){var e=new Arc;const t=this.readUint8();aver(t<=256);for(let r=0;r<t;r++)16==this.coordsIndexLenBits?e.push(this.readUint16()):e.push(this.readUint32());this.topology.taeArcs.push(e)}return aver(this.numArcs==this.topology.taeArcs.length-1),!0}determineBitsNeededForArcs(){this.arcRefLenBits=this.readUint8(),this.numArcs<32767?this.arcIndexLenBits=16:this.arcIndexLenBits=32,this.topology.taeCoords.length<65536?this.coordsIndexLenBits=16:this.coordsIndexLenBits=32}readProperties(){expect(this.numProperties,'Number'),aver(this.numProperties>=0);for(let e=0;e<this.numProperties;e++)this.propertyNames.push(this.readLenPrefixedText());for(let e=0;e<this.numProperties;e++)this.propertyTypes.push(this.readLenPrefixedText());return aver(this.numProperties==this.propertyNames.length),aver(this.numProperties==this.propertyTypes.length),!0}readFeatureProperties(e,t,r,s,a){switch(expect(e,['GcsPointFeature','GcsLineFeature','GcsPolygonFeature']),expect(t,'String'),expect(r,'String'),expect(s,'Array'),expect(a,'Array'),t){case'xCoord':return s.push(this.deIceLongitude()),!0;case'yCoord':return a.push(this.deIceLatitude()),!0;case'xSegment':var i=this.readUint32();for(let e=0;e<i;e++)s.push(this.deIceLongitude());return!0;case'ySegment':var n=this.readUint32();for(let e=0;e<n;e++)a.push(this.deIceLatitude());return!0;case'xRings':var o=this.readUint16();for(let e=0;e<o;e++){let e=new Array;i=this.readUint32();for(let t=0;t<i;t++)e.push(this.deIceLongitude());s.push(e)}return!0;case'yRings':o=this.readUint16();for(let e=0;e<o;e++){let e=new Array;n=this.readUint32();for(let t=0;t<n;t++)e.push(this.deIceLatitude());a.push(e)}return!0;case'lngCoord':return s.push(Math.fround(this.readFloat32())),!0;case'latCoord':return a.push(Math.fround(this.readFloat32())),!0;case'lngSegment':var d=this.readUint32();for(let e=0;e<d;e++)s.push(Math.fround(this.readFloat32()));return!0;case'latSegment':var h=this.readUint32();for(let e=0;e<h;e++)a.push(Math.fround(this.readFloat32()));return!0;case'lngRings':o=this.readUint16();for(let e=0;e<o;e++){let e=new Array;d=this.readUint32();for(let t=0;t<d;t++)e.push(this.readFloat32());s.push(e)}return!0;case'latRings':o=this.readUint16();for(let e=0;e<o;e++){let e=new Array;h=this.readUint32();for(let t=0;t<h;t++)e.push(this.readFloat32());a.push(e)}return!0;case'arcRefs':o=this.readUint16();this.readRingArcRefs(e.outerRing);const l=o-1;for(let t=0;t<l;t++)e.innerRings.push(new PolygonRing),this.readRingArcRefs(e.innerRings[t]);return!0;default:return this.handleProperties(e,t,r,null)}}readRingArcRefs(e){if(expect(e,'PolygonRing'),8==this.arcRefLenBits)var t=this.readUint8();else if(16==this.arcRefLenBits)t=this.readUint16();else t=this.readUint32();for(let d=0;d<t;d++){if(16==this.arcIndexLenBits)var r=this.readInt16();else r=this.readInt32();var s=Math.abs(r),a=this.topology.taeArcs[s];if(r<0)var i=a.getReverseIndexes();else i=a;for(let t=0;t<i.length-1;t++){var n=i[t],o=this.topology.taeCoords[n];e.push(o)}}}handleProperties(e,t,r,s){if(expect(e,['GcsPointFeature','GcsLineFeature','GcsPolygonFeature']),expect(t,'String'),expect(r,'String'),expect(s,'null'),-1!=r.indexOf('[]')){var a=new Array;e.kvPairs[t]=a;var i=this.readUint8();switch(r){case'tinyUint[]':for(let e=0;e<i;e++)a.push(this.readUint8());return!0;case'shortUint[]':for(let e=0;e<i;e++)a.push(this.readUint16());return!0;case'longUint[]':for(let e=0;e<i;e++)a.push(this.readUint32());return!0;case'tinyInt[]':for(let e=0;e<i;e++)a.push(this.readInt8());return!0;case'shortInt[]':for(let e=0;e<i;e++)a.push(this.readInt16());return!0;case'longInt[]':for(let e=0;e<i;e++)a.push(this.readInt32());return!0;case'float[]':for(let e=0;e<i;e++)a.push(this.readFloat32());return!0;case'string[]':for(let e=0;e<i;e++)a.push(this.readLenPrefixedText());return!0;default:return terminal.abnormal(`unexpected propertyType '${r}' for propertyName ${t}, everything else is now suspect`),!1}}switch(r){case'tinyUint':return e.kvPairs[t]=this.readUint8(),!0;case'shortUint':return e.kvPairs[t]=this.readUint16(),!0;case'longUint':return e.kvPairs[t]=this.readUint32(),!0;case'tinyInt':return e.kvPairs[t]=this.readInt8(),!0;case'shortInt':return e.kvPairs[t]=this.readInt16(),!0;case'longInt':return e.kvPairs[t]=this.readInt32(),!0;case'float':return e.kvPairs[t]=Number(this.readFloat32().toFixed(2)),!0;case'string':return e.kvPairs[t]=this.readLenPrefixedText(),!0;case'json':return e.kvPairs[t]=JSON.parse(this.readLenPrefixedText()),!0;default:return terminal.abnormal(`unexpected propertyType '${r}' for propertyName ${t}, everything else is now suspect`),!1}}deIceLongitude(){var e=null;return e=2==this.packedWidth?this.readUint16():this.readUint32(),this.indexedCoordinates.getLongitude(e)}deIceLatitude(){var e=null;return e=2==this.packedWidth?this.readUint16():this.readUint32(),this.indexedCoordinates.getLatitude(e)}get packedWidth(){return this.indexedCoordinates.packedWidth}readMarker(){var e=this.payload.getUint32(this.payloadOffset,!0);return this.payloadOffset+=4,e}readUint8(){var e=this.payload.getUint8(this.payloadOffset,!0);return this.payloadOffset+=1,e}readUint16(){var e=this.payload.getUint16(this.payloadOffset,!0);return this.payloadOffset+=2,e}readUint32(){var e=this.payload.getUint32(this.payloadOffset,!0);return this.payloadOffset+=4,e}readInt8(){var e=this.payload.getInt8(this.payloadOffset,!0);return this.payloadOffset+=1,e}readInt16(){var e=this.payload.getInt16(this.payloadOffset,!0);return this.payloadOffset+=2,e}readInt32(){var e=this.payload.getInt32(this.payloadOffset,!0);return this.payloadOffset+=4,e}readFloat32(){var e=this.payload.getFloat32(this.payloadOffset,!0);return this.payloadOffset+=4,e}readLenPrefixedText(){var e=this.payload.getUint8(this.payloadOffset,!1);if(0==e)return this.payloadOffset=this.payloadOffset+1,null;if(e<128){let t=this.payloadOffset+1,r=t+e,s=(new TextDecoder).decode(this.payload.buffer.slice(t,r));return this.payloadOffset=this.payloadOffset+1+e,s}{e=this.payload.getUint16(this.payloadOffset,!1)-32768;let t=this.payloadOffset+2,r=t+e,s=(new TextDecoder).decode(this.payload.buffer.slice(t,r));return this.payloadOffset=this.payloadOffset+2+e,s}}}