ebnf-railroad-visualizer/out/Compressor.js

A web-based EBNF railroad diagram visualizer

/*
 * This work © 2024 by Alexander Voglsperger is licensed under CC BY 4.0.
 * To view a copy of this license, see the provided LICENSE file or visit https://creativecommons.org/licenses/by/4.0/
 */
/**
 * Compresses a string using the specified compression format, which is "gzip" by default.
 * @param input The string to compress
 * @param format The compression format to use (default: gzip)
 * @returns The compressed data as Uint8Array
 */
async function compressString(input, format = "gzip") {
    const inputBytes = new TextEncoder().encode(input);
    const stream = new CompressionStream(format);
    const writer = stream.writable.getWriter();
    // Put input bytes through the compression stream via writer
    writer.write(inputBytes);
    writer.close();
    // Response allows convertion of readable stream to an ArrayBuffer
    const compressedDataBuffer = await new Response(stream.readable).arrayBuffer();
    return new Uint8Array(compressedDataBuffer);
}
/**
 * Compresses and base64-encodes a string using the specified compression format.
 * @param input The string to compress and encode
 * @param format The compression format to use (default: gzip)
 * @returns The compressed and encoded data as a base64 string
 */
export async function compressAndEncode(input, format = "gzip") {
    console.debug("Compressing and encoding data...");
    const compressedData = await compressString(input, format);
    return btoa(String.fromCharCode(...compressedData));
}
// ---------------------------------------------------------------------------------------------------------------------
/**
 * Decodes and decompresses a base64-encoded string.
 * @param input The compressed and base64-encoded data
 * @param format The compression format to use (default: gzip)
 * @returns The decompressed data as a string
 */
export async function decodeAndDecompress(input, format = "gzip") {
    console.debug("Decoding and decompressing data...");
    const compressedData = atob(input);
    const compressedByteArray = new Uint8Array(compressedData.length);
    for (let i = 0; i < compressedData.length; i++) {
        compressedByteArray[i] = compressedData.charCodeAt(i);
    }
    return await decompressString(compressedByteArray, format);
}
/**
 * Decompresses a Uint8Array using the specified compression format.
 * @param input The compressed data
 * @param format The compression format to use (default: gzip)
 * @returns The decompressed data as a string
 */
async function decompressString(input, format = "gzip") {
    const stream = new DecompressionStream(format);
    const writer = stream.writable.getWriter();
    writer.write(input);
    writer.close();
    const decompressedDataBuffer = await new Response(stream.readable).arrayBuffer();
    return new TextDecoder().decode(decompressedDataBuffer);
}
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