gdal3.js/src/allJsFunctions/helper/options.js

gdal3.js is a port of Gdal applications (**gdal_translate**, **ogr2ogr**, **gdal_rasterize**, **gdalwarp**, **gdaltransform**) to Webassembly. It allows you to convert raster and vector geospatial data to various formats and coordinate systems.

/* eslint-disable no-underscore-dangle */
import { GDALFunctions } from '../../allCFunctions';

export function getOptions(options) {
    const appOptions = [];
    const appConfig = {};
    for (let i = 0; i < options.length; i += 1) {
        const option = options[i];
        if (option === '--config') {
            appConfig[options[i + 1]] = options[i + 2];
            i += 2;
        } else {
            appOptions.push(option);
        }
    }
    const ptrsArray = appOptions.map((str) => GDALFunctions.Module._malloc(GDALFunctions.Module.lengthBytesUTF8(str) + 1));
    ptrsArray.push(0);
    const strPtrs = Uint32Array.from(ptrsArray);
    appOptions.forEach((str, i) => {
        GDALFunctions.Module.stringToUTF8(str, strPtrs[i], GDALFunctions.Module.lengthBytesUTF8(str) + 1);
    });
    const ptrOffset = GDALFunctions.Module._malloc(strPtrs.length * strPtrs.BYTES_PER_ELEMENT);
    GDALFunctions.Module.HEAPU32.set(strPtrs, ptrOffset / strPtrs.BYTES_PER_ELEMENT);
    return { ptr: ptrOffset, ptrArray: ptrsArray, config: appConfig };
}

export function clearOptions(i) {
    GDALFunctions.Module._free(i.ptr);
    i.ptrArray.forEach((ptr) => { GDALFunctions.Module._free(ptr); });
}