pdf.js/test/unit/stream_spec.js

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/* 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';
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(function (root, factory) {
if (typeof define === 'function' && define.amd) {
define('pdfjs-test/unit/stream_spec', ['exports',
'pdfjs/core/primitives', 'pdfjs/core/stream'], factory);
} else if (typeof exports !== 'undefined') {
factory(exports, require('../../src/core/primitives.js'),
require('../../src/core/stream.js'));
} else {
factory((root.pdfjsTestUnitStreamSpec = {}), root.pdfjsCorePrimitives,
root.pdfjsCoreStream);
}
}(this, function (exports, corePrimitives, coreStream) {
var Dict = corePrimitives.Dict;
var Stream = coreStream.Stream;
var PredictorStream = coreStream.PredictorStream;
describe('stream', function() {
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beforeEach(function() {
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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;
}
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};
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}
});
});
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);
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expect(result).toMatchTypedArray(
new Uint8Array([100, 3, 101, 2, 102, 1])
);
});
});
});
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}));