52 lines
1.5 KiB
JavaScript
52 lines
1.5 KiB
JavaScript
/* globals jasmine, expect, it, describe, beforeEach, Stream, PredictorStream,
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Dict */
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'use strict';
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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 +
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', 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([2, 100, 3, 2, 1, 255, 2, 1, 255]),
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0, 9, dict);
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var predictor = new PredictorStream(input, /* length = */ 9, dict);
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var result = predictor.getBytes(6);
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expect(result).toMatchTypedArray(
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new Uint8Array([100, 3, 101, 2, 102, 1])
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);
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});
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});
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});
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