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test.deflator.js
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test.deflator.js
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/* eslint-disable no-console */
const expect = chai.expect;
import { inflateInit, inflate } from "../vendor/pako/lib/zlib/inflate.js";
import ZStream from "../vendor/pako/lib/zlib/zstream.js";
import Deflator from "../core/deflator.js";
function _inflator(compText, expected) {
let strm = new ZStream();
let chunkSize = 1024 * 10 * 10;
strm.output = new Uint8Array(chunkSize);
inflateInit(strm, 5);
if (expected > chunkSize) {
chunkSize = expected;
strm.output = new Uint8Array(chunkSize);
}
/* eslint-disable camelcase */
strm.input = compText;
strm.avail_in = strm.input.length;
strm.next_in = 0;
strm.next_out = 0;
strm.avail_out = expected.length;
/* eslint-enable camelcase */
let ret = inflate(strm, 0);
// Check that return code is not an error
expect(ret).to.be.greaterThan(-1);
return new Uint8Array(strm.output.buffer, 0, strm.next_out);
}
describe('Deflate data', function () {
it('should be able to deflate messages', function () {
let deflator = new Deflator();
let text = "123asdf";
let preText = new Uint8Array(text.length);
for (let i = 0; i < preText.length; i++) {
preText[i] = text.charCodeAt(i);
}
let compText = deflator.deflate(preText);
let inflatedText = _inflator(compText, text.length);
expect(inflatedText).to.array.equal(preText);
});
it('should be able to deflate large messages', function () {
let deflator = new Deflator();
/* Generate a big string with random characters. Used because
repetition of letters might be deflated more effectively than
random ones. */
let text = "";
let characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
for (let i = 0; i < 300000; i++) {
text += characters.charAt(Math.floor(Math.random() * characters.length));
}
let preText = new Uint8Array(text.length);
for (let i = 0; i < preText.length; i++) {
preText[i] = text.charCodeAt(i);
}
let compText = deflator.deflate(preText);
//Check that the compressed size is expected size
expect(compText.length).to.be.greaterThan((1024 * 10 * 10) * 2);
let inflatedText = _inflator(compText, text.length);
expect(inflatedText).to.array.equal(preText);
});
});