@loaders.gl/compression/dist/workers/compression-worker.js

Decompression and compression plugins for loaders.gl

// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { createWorker } from '@loaders.gl/worker-utils';
// Compressors
import { NoCompression } from "../lib/no-compression.js";
import { BrotliCompression } from "../lib/brotli-compression.js";
import { DeflateCompression } from "../lib/deflate-compression.js";
import { GZipCompression } from "../lib/gzip-compression.js";
import { LZ4Compression } from "../lib/lz4-compression.js";
// import {LZOCompression} from '../lib/lzo-compression';
import { SnappyCompression } from "../lib/snappy-compression.js";
import { ZstdCompression } from "../lib/zstd-compression.js";
// Import big dependencies
// import brotli from 'brotli'; - brotli has problems with decompress in browsers
// import brotliDecompress from 'brotli/decompress';
import lz4js from 'lz4js';
// import lzo from 'lzo';
// import {ZstdCodec} from 'zstd-codec';
// Inject large dependencies through Compression constructor options
const modules = {
    // brotli has problems with decompress in browsers
    // brotli: {
    //   decompress: brotliDecompress,
    //   compress: () => {
    //     throw new Error('brotli compress');
    //   }
    // },
    lz4js
    // lzo,
    // 'zstd-codec': ZstdCodec
};
/** @type {Compression[]} */
const COMPRESSIONS = [
    new NoCompression({ modules }),
    new BrotliCompression({ modules }),
    new DeflateCompression({ modules }),
    new GZipCompression({ modules }),
    // new LZOCompression({modules}),
    new LZ4Compression({ modules }),
    new SnappyCompression({ modules }),
    new ZstdCompression({ modules })
];
createWorker(async (data, options = {}) => {
    const operation = getOperation(String(options?.operation));
    const compression = getCompression(String(options?.compression));
    // @ts-ignore
    switch (operation) {
        case 'compress':
            return await compression.compress(data);
        case 'decompress':
            return await compression.decompress(data);
        default:
            throw new Error('invalid option');
    }
});
function getOperation(operation) {
    switch (operation) {
        case 'compress':
        case 'deflate':
            return 'compress';
        case 'decompress':
        case 'inflate':
            return 'decompress';
        default:
            throw new Error(`@loaders.gl/compression: Unsupported operation ${operation}. Expected 'compress' or 'decompress'`);
    }
}
function getCompression(name) {
    const Compression = COMPRESSIONS.find((compression_) => name === compression_.name);
    if (!Compression) {
        throw new Error(`@loaders.gl/compression: Unsupported compression ${name}`);
    }
    return Compression;
}