comunic/3rdparty/pdf.js/test/unit/stream_spec.js

/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* globals expect, it, describe, beforeEach, Stream, PredictorStream, Dict */

'use strict';

describe('stream', function() {
  beforeEach(function() {
    this.addMatchers({
      toMatchTypedArray: function(expected) {
        var actual = this.actual;
        if (actual.length !== expected.length) {
          return false;
        }
        for (var i = 0, ii = expected.length; i < ii; i++) {
          var a = actual[i], b = expected[i];
          if (a !== b) {
            return false;
          }
        }
        return true;
      }
    });
  });
  describe('PredictorStream', function() {
    it('should decode simple predictor data', function() {
      var dict = new Dict();
      dict.set('Predictor', 12);
      dict.set('Colors', 1);
      dict.set('BitsPerComponent', 8);
      dict.set('Columns', 2);

      var input = new Stream(new Uint8Array([2, 100, 3, 2, 1, 255, 2, 1, 255]),
                             0, 9, dict);
      var predictor = new PredictorStream(input, /* length = */ 9, dict);
      var result = predictor.getBytes(6);

      expect(result).toMatchTypedArray(
        new Uint8Array([100, 3, 101, 2, 102, 1])
      );
    });
  });
});