base64-arraybuffer.ts

import {equal, ok} from 'assert';
import {encode, decode} from '../src/';

function stringArrayBuffer(str: string) {
    const buffer = new ArrayBuffer(str.length);
    const bytes = new Uint8Array(buffer);

    str.split('').forEach(function (str, i) {
        bytes[i] = str.charCodeAt(0);
    });

    return buffer;
}

function testArrayBuffers(buffer1: ArrayBuffer, buffer2: ArrayBuffer) {
    const len1 = buffer1.byteLength;
    const len2 = buffer2.byteLength;
    const view1 = new Uint8Array(buffer1);
    const view2 = new Uint8Array(buffer2);

    if (len1 !== len2) {
        return false;
    }

    for (let i = 0; i < len1; i++) {
        if (view1[i] === undefined || view1[i] !== view2[i]) {
            return false;
        }
    }
    return true;
}

function rangeArrayBuffer() {
    const buffer = new ArrayBuffer(256);
    const bytes = new Uint8Array(buffer);
    for (let i = 0; i < 256; i++) {
        bytes[i] = i;
    }

    return buffer;
}

describe('encode', () => {
    it('encode "Hello world"', () => equal(encode(stringArrayBuffer('Hello world')), 'SGVsbG8gd29ybGQ='));
    it('encode "Man"', () => equal(encode(stringArrayBuffer('Man')), 'TWFu'));
    it('encode "Ma"', () => equal(encode(stringArrayBuffer('Ma')), 'TWE='));
    it('encode "Hello worlds!"', () => equal(encode(stringArrayBuffer('Hello worlds!')), 'SGVsbG8gd29ybGRzIQ=='));
    it('encode all binary characters', () =>
        equal(
            encode(rangeArrayBuffer()),
            'AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3BxcnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmqq6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w=='
        ));
});

describe('decode', () => {
    it('decode "Man"', () => ok(testArrayBuffers(decode('TWFu'), stringArrayBuffer('Man'))));
    it('decode "Hello world"', () =>
        ok(testArrayBuffers(decode('SGVsbG8gd29ybGQ='), stringArrayBuffer('Hello world'))));
    it('decode "Hello worlds!"', () =>
        ok(testArrayBuffers(decode('SGVsbG8gd29ybGRzIQ=='), stringArrayBuffer('Hello worlds!'))));
    it('decode all binary characters', () =>
        ok(
            testArrayBuffers(
                decode(
                    'AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3BxcnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmqq6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w=='
                ),
                rangeArrayBuffer()
            )
        ));
});