k9crypt/src/utils/compression.js

A special encryption algorithm created for K9Crypt.

const zlib = require('zlib');
const lzma = require('lzma-native');

exports.compress = async (data) => {
  try {
    const brotliParams = {
      params: {
        [zlib.constants.BROTLI_PARAM_MODE]: zlib.constants.BROTLI_MODE_TEXT,
        [zlib.constants.BROTLI_PARAM_QUALITY]: zlib.constants.BROTLI_MAX_QUALITY,
        [zlib.constants.BROTLI_PARAM_SIZE_HINT]: Buffer.byteLength(data, 'utf8'),
        [zlib.constants.BROTLI_PARAM_LGWIN]: 24
      }
    };

    const brotliCompressed = await new Promise((resolve, reject) => {
      zlib.brotliCompress(Buffer.from(data, 'utf8'), brotliParams, (err, compressed) => {
        if (err) reject(err);
        else resolve(compressed);
      });
    });

    const lzmaCompressed = await lzma.compress(brotliCompressed, 9);
    return lzmaCompressed;
  } catch (error) {
    throw new Error(`Compression error: ${error.message}`);
  }
};

exports.decompress = async (data) => {
  try {
    const lzmaDecompressed = await lzma.decompress(data);

    const brotliDecompressed = await new Promise((resolve, reject) => {
      zlib.brotliDecompress(lzmaDecompressed, (err, decompressed) => {
        if (err) reject(err);
        else resolve(decompressed);
      });
    });

    return brotliDecompressed;
  } catch (error) {
    throw new Error(`Decompression error: ${error.message}`);
  }
};