59 lines
1.4 KiB
JavaScript
59 lines
1.4 KiB
JavaScript
'use strict';
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const fs = require('fs');
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const stream = require('stream');
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const zlib = require('zlib');
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const {promisify} = require('util');
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const duplexer = require('duplexer');
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const getOptions = options => ({level: 9, ...options});
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const gzip = promisify(zlib.gzip);
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module.exports = async (input, options) => {
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if (!input) {
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return 0;
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}
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const data = await gzip(input, getOptions(options));
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return data.length;
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};
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module.exports.sync = (input, options) => zlib.gzipSync(input, getOptions(options)).length;
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module.exports.stream = options => {
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const input = new stream.PassThrough();
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const output = new stream.PassThrough();
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const wrapper = duplexer(input, output);
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let gzipSize = 0;
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const gzip = zlib.createGzip(getOptions(options))
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.on('data', buf => {
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gzipSize += buf.length;
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})
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.on('error', () => {
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wrapper.gzipSize = 0;
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})
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.on('end', () => {
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wrapper.gzipSize = gzipSize;
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wrapper.emit('gzip-size', gzipSize);
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output.end();
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});
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input.pipe(gzip);
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input.pipe(output, {end: false});
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return wrapper;
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};
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module.exports.file = (path, options) => {
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return new Promise((resolve, reject) => {
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const stream = fs.createReadStream(path);
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stream.on('error', reject);
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const gzipStream = stream.pipe(module.exports.stream(options));
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gzipStream.on('error', reject);
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gzipStream.on('gzip-size', resolve);
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});
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};
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module.exports.fileSync = (path, options) => module.exports.sync(fs.readFileSync(path), options);
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