72 lines
1.7 KiB
JavaScript
72 lines
1.7 KiB
JavaScript
// @flow
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import {decodeLength, encodeLength} from '../src/util/shortvec-encoding';
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function checkDecodedArray(array: Array<number>, expectedValue: number) {
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expect(decodeLength(array)).toEqual(expectedValue);
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expect(array.length).toEqual(0);
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}
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test('shortvec decodeLength', () => {
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let array = [];
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checkDecodedArray(array, 0);
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array = [5];
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checkDecodedArray(array, 5);
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array = [0x7f];
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checkDecodedArray(array, 0x7f);
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array = [0x80, 0x01];
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checkDecodedArray(array, 0x80);
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array = [0xff, 0x01];
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checkDecodedArray(array, 0xff);
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array = [0x80, 0x02];
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checkDecodedArray(array, 0x100);
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array = [0xff, 0xff, 0x01];
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checkDecodedArray(array, 0x7fff);
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array = [0x80, 0x80, 0x80, 0x01];
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checkDecodedArray(array, 0x200000);
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});
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function checkEncodedArray(
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array: Array<number>,
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len: number,
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prevLength: number,
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addedLength: number,
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expectedArray: Array<number>,
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) {
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encodeLength(array, len);
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expect(array.length).toEqual(prevLength);
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expect(array.slice(-addedLength)).toEqual(expectedArray);
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}
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test('shortvec encodeLength', () => {
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let array = [];
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let prevLength = 1;
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checkEncodedArray(array, 0, prevLength, 1, [0]);
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checkEncodedArray(array, 5, (prevLength += 1), 1, [5]);
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checkEncodedArray(array, 0x7f, (prevLength += 1), 1, [0x7f]);
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checkEncodedArray(array, 0x80, (prevLength += 2), 2, [0x80, 0x01]);
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checkEncodedArray(array, 0xff, (prevLength += 2), 2, [0xff, 0x01]);
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checkEncodedArray(array, 0x100, (prevLength += 2), 2, [0x80, 0x02]);
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checkEncodedArray(array, 0x7fff, (prevLength += 3), 3, [0xff, 0xff, 0x01]);
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prevLength = checkEncodedArray(array, 0x200000, (prevLength += 4), 4, [
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0x80,
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0x80,
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0x80,
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0x01,
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]);
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});
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