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77 lines
2.1 KiB
77 lines
2.1 KiB
8 years ago
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/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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var corePrimitives = require('../../core/primitives.js');
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var coreStream = require('../../core/stream.js');
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var Dict = corePrimitives.Dict;
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var Stream = coreStream.Stream;
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var PredictorStream = coreStream.PredictorStream;
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describe('stream', function () {
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beforeEach(function () {
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jasmine.addMatchers({
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toMatchTypedArray: function (util, customEqualityTesters) {
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return {
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compare: function (actual, expected) {
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var result = {};
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if (actual.length !== expected.length) {
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result.pass = false;
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result.message = 'Array length: ' + actual.length + ', expected: ' + expected.length;
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return result;
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}
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result.pass = true;
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for (var i = 0, ii = expected.length; i < ii; i++) {
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var a = actual[i], b = expected[i];
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if (a !== b) {
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result.pass = false;
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break;
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}
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}
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return result;
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}
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};
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}
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});
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});
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describe('PredictorStream', function () {
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it('should decode simple predictor data', function () {
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var dict = new Dict();
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dict.set('Predictor', 12);
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dict.set('Colors', 1);
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dict.set('BitsPerComponent', 8);
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dict.set('Columns', 2);
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var input = new Stream(new Uint8Array([
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2,
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100,
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3,
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2,
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1,
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255,
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2,
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1,
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255
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]), 0, 9, dict);
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var predictor = new PredictorStream(input, 9, dict);
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var result = predictor.getBytes(6);
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expect(result).toMatchTypedArray(new Uint8Array([
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100,
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3,
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101,
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2,
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102,
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1
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]));
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});
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});
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});
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