pako/test/deflate_cover.js

// Deflate coverage tests

/*global describe, it*/


'use strict';


var assert = require('assert');
var fs = require('fs');
var path  = require('path');

var c = require('../lib/zlib/constants');
var msg = require('../lib/zlib/messages');
var zlib_deflate = require('../lib/zlib/deflate.js');
var zstream = require('../lib/zlib/zstream');

var pako  = require('../index');


var short_sample = 'hello world';
var long_sample = fs.readFileSync(path.join(__dirname, 'fixtures/samples/lorem_en_100k.txt'));

function testDeflate(data, opts, flush) {
  var deflator = new pako.Deflate(opts);
  deflator.push(data, flush);
  deflator.push(data, true);

  assert.equal(deflator.err, false, msg[deflator.err]);
}

describe('Deflate support', function() {
  it('stored', function() {
    testDeflate(short_sample, {level: 0, chunkSize: 200}, 0);
    testDeflate(short_sample, {level: 0, chunkSize: 10}, 5);
  });
  it('fast', function() {
    testDeflate(short_sample, {level: 1, chunkSize: 10}, 5);
    testDeflate(long_sample, {level: 1, memLevel: 1, chunkSize: 10}, 0);
  });
  it('slow', function() {
    testDeflate(short_sample, {level: 4, chunkSize: 10}, 5);
    testDeflate(long_sample, {level: 9, memLevel: 1, chunkSize: 10}, 0);
  });
  it('rle', function() {
    testDeflate(short_sample, {strategy: 3}, 0);
    testDeflate(short_sample, {strategy: 3, chunkSize: 10}, 5);
    testDeflate(long_sample, {strategy: 3, chunkSize: 10}, 0);
  });
  it('huffman', function() {
    testDeflate(short_sample, {strategy: 2}, 0);
    testDeflate(short_sample, {strategy: 2, chunkSize: 10}, 5);
    testDeflate(long_sample, {strategy: 2, chunkSize: 10}, 0);

  });
});

describe('Deflate states', function() {
  //in port checking input parameters was removed
  it('inflate bad parameters', function () {
    var ret, strm;

    ret = zlib_deflate.deflate(null, 0);
    assert(ret === c.Z_STREAM_ERROR);

    strm = new zstream();

    ret = zlib_deflate.deflateInit(null);
    assert(ret === c.Z_STREAM_ERROR);

    ret = zlib_deflate.deflateInit(strm, 6);
    assert(ret === c.Z_OK);

    ret = zlib_deflate.deflateSetHeader(null);
    assert(ret === c.Z_STREAM_ERROR);

    strm.state.wrap = 1;
    ret = zlib_deflate.deflateSetHeader(strm, null);
    assert(ret === c.Z_STREAM_ERROR);

    strm.state.wrap = 2;
    ret = zlib_deflate.deflateSetHeader(strm, null);
    assert(ret === c.Z_OK);

    ret = zlib_deflate.deflate(strm, c.Z_FINISH);
    assert(ret === c.Z_BUF_ERROR);

    ret = zlib_deflate.deflateEnd(null);
    assert(ret === c.Z_STREAM_ERROR);

    //BS_NEED_MORE
    strm.state.status = 5;
    ret = zlib_deflate.deflateEnd(strm);
    assert(ret === c.Z_STREAM_ERROR);
  });
});