there is difference between pako and 7zip

[qlqllu]

I have an UT to compare the zip content. The animated.zip is generated by 7zip.

"jszip": "2.4.0",
"pako": "0.2.5",

The result is different:

"PK\u0003\u0004\n\u0000\u0000\u0000\b\u0000\u0000\u00001E??\u0000A§\f\u0000\u0000O\u000f\u0000\u0000\f\u0000\u0000\u0000animated
"PK\u0003\u0004\n\u0000\u0000\u0000\b\u0000\u0000\u0000yC??\u0000A-\f\u0000\u0000O\u000f\u0000\u0000\f\u0000\u0000\u0000animated

This is the code:

var jsZIP = require('jszip');
var pako = require("pako");

jsZIP.compressions.DEFLATE.compress = function (input) {
  return pako.deflateRaw(input);
};

describe('Animated GIF compression', function() {
  it('Compression animated.gif', function() {
    var zip = new jsZIP();
    var fileContent = fs.readFileSync(
      path.join(__dirname, 'animated.gif'), {
        encoding: 'base64'
      }
    );
    zip.file('animated.gif', fileContent, {
      base64: true,
      date: new Date("Sep 17, 2014")
    });
    var data = zip.generate({
      type: 'nodebuffer',
      compression: 'DEFLATE'
    });
    var zipContent = fs.readFileSync(
      path.join(__dirname, 'animated.zip')
    );
    assert.strictEqual(data.toString('binary'), zipContent.toString('binary'));
  });
});

[puzrin]

Deflate algorythm has multiple setting to tune output (compression level, for example). This library is zlib port, and guaranty the same output for the same options. I don't understand, why do you ask about 7zip here - it's not related, and i don't know it's settings.

[puzrin]

Closed - not related to this project.