pdfjs-dist/lib/test/unit/stream_spec.js

/* Copyright 2017 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
'use strict';
var corePrimitives = require('../../core/primitives.js');
var coreStream = require('../../core/stream.js');
var Dict = corePrimitives.Dict;
var Stream = coreStream.Stream;
var PredictorStream = coreStream.PredictorStream;
describe('stream', function () {
 beforeEach(function () {
  jasmine.addMatchers({
   toMatchTypedArray: function (util, customEqualityTesters) {
    return {
     compare: function (actual, expected) {
      var result = {};
      if (actual.length !== expected.length) {
       result.pass = false;
       result.message = 'Array length: ' + actual.length + ', expected: ' + expected.length;
       return result;
      }
      result.pass = true;
      for (var i = 0, ii = expected.length; i < ii; i++) {
       var a = actual[i], b = expected[i];
       if (a !== b) {
        result.pass = false;
        break;
       }
      }
      return result;
     }
    };
   }
  });
 });
 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, 9, dict);
   var result = predictor.getBytes(6);
   expect(result).toMatchTypedArray(new Uint8Array([
    100,
    3,
    101,
    2,
    102,
    1
   ]));
  });
 });
});