node/test/simple/test-zlib-from-string.js

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// test compressing and uncompressing a string with zlib

var common = require('../common.js');
var assert = require('assert');
var zlib = require('zlib');

var inputString = 'ΩΩLorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi faucibus, purus at gravida dictum, libero arcu convallis lacus, in commodo libero metus eu nisi. Nullam commodo, neque nec porta placerat, nisi est fermentum augue, vitae gravida tellus sapien sit amet tellus. Aenean non diam orci. Proin quis elit turpis. Suspendisse non diam ipsum. Suspendisse nec ullamcorper odio. Vestibulum arcu mi, sodales non suscipit id, ultrices ut massa. Sed ac sem sit amet arcu malesuada fermentum. Nunc sed. ';
var expectedBase64Deflate = 'eJxdUUtOQzEMvMoc4OndgT0gJCT2buJWlpI4jePeqZfpmXAKLRKbLOzx/HK73q6vOrhCunlF1qIDJhNUeW5I2ozT5OkDlKWLJWkncJG5403HQXAkT3Jw29B9uIEmToMukglZ0vS6ociBh4JG8sV4oVLEUCitK2kxq1WzPnChHDzsaGKy491LofoAbWh8do43oeuYhB5EPCjcLjzYJo48KrfQBvnJecNFJvHT1+RSQsGoC7dn2t/xjhduTA1NWyQIZR0pbHwMDatnD+crPqKSqGPHp1vnlsWM/07ubf7bheF7kqSj84Bm0R1fYTfaK8vqqqfKBtNMhe3OZh6N95CTvMX5HJJi4xOVzCgUOIMSLH7wmeOHaFE4RdpnGavKtrB5xzfO/Ll9';
var expectedBase64Gzip = 'H4sIAAAAAAAAA11RS05DMQy8yhzg6d2BPSAkJPZu4laWkjiN496pl+mZcAotEpss7PH8crverq86uEK6eUXWogMmE1R5bkjajNPk6QOUpYslaSdwkbnjTcdBcCRPcnDb0H24gSZOgy6SCVnS9LqhyIGHgkbyxXihUsRQKK0raTGrVbM+cKEcPOxoYrLj3Uuh+gBtaHx2jjeh65iEHkQ8KNwuPNgmjjwqt9AG+cl5w0Um8dPX5FJCwagLt2fa3/GOF25MDU1bJAhlHSlsfAwNq2cP5ys+opKoY8enW+eWxYz/Tu5t/tuF4XuSpKPzgGbRHV9hN9ory+qqp8oG00yF7c5mHo33kJO8xfkckmLjE5XMKBQ4gxIsfvCZ44doUThF2mcZq8q2sHnHNzRtagj5AQAA';

zlib.deflate(inputString, function(err, buffer) {
  assert.equal(buffer.toString('base64'), expectedBase64Deflate, 'deflate encoded string should match');
});

zlib.gzip(inputString, function(err, buffer) {
  // Can't actually guarantee that we'll get exactly the same
  // deflated bytes when we compress a string, since the header
  // depends on stuff other than the input string itself.
  // However, decrypting it should definitely yield the same
  // result that we're expecting, and this should match what we get
  // from inflating the known valid deflate data.
  zlib.gunzip(buffer, function (err, gunzipped) {
    assert.equal(gunzipped.toString(), inputString,
                 'Should get original string after gzip/gunzip');
  });
});

var buffer = new Buffer(expectedBase64Deflate, 'base64');
zlib.unzip(buffer, function(err, buffer) {
  assert.equal(buffer.toString(), inputString, 'decoded inflated string should match');
});

buffer = new Buffer(expectedBase64Gzip, 'base64');
zlib.unzip(buffer, function(err, buffer) {
  assert.equal(buffer.toString(), inputString, 'decoded gunzipped string should match');
});