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feat(encoding): add base64 (denoland/deno#5811)
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skdltmxn authored May 24, 2020
1 parent 6389dd5 commit 1ff01d3
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41 changes: 41 additions & 0 deletions encoding/base64.ts
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.

/**
* Converts given data with base64 encoding
* @param data input to encode
*/
export function encode(data: string | ArrayBuffer): string {
if (typeof data === "string") {
return window.btoa(data);
} else {
const d = new Uint8Array(data);
let dataString = "";
for (let i = 0; i < d.length; ++i) {
dataString += String.fromCharCode(d[i]);
}

return window.btoa(dataString);
}
}

/**
* Converts given base64 encoded data back to original
* @param data input to decode
*/
export function decode(data: string): ArrayBuffer {
const binaryString = decodeString(data);
const binary = new Uint8Array(binaryString.length);
for (let i = 0; i < binary.length; ++i) {
binary[i] = binaryString.charCodeAt(i);
}

return binary.buffer;
}

/**
* Decodes data assuming the output is in string type
* @param data input to decode
*/
export function decodeString(data: string): string {
return window.atob(data);
}
47 changes: 47 additions & 0 deletions encoding/base64_test.ts
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.

const { test } = Deno;
import { assertEquals } from "../testing/asserts.ts";
import { encode, decode, decodeString } from "./base64.ts";

const testsetString = [
["", ""],
["f", "Zg=="],
["fo", "Zm8="],
["foo", "Zm9v"],
["foob", "Zm9vYg=="],
["fooba", "Zm9vYmE="],
["foobar", "Zm9vYmFy"],
];

const testsetBinary = [
[new TextEncoder().encode("\x00"), "AA=="],
[new TextEncoder().encode("\x00\x00"), "AAA="],
[new TextEncoder().encode("\x00\x00\x00"), "AAAA"],
[new TextEncoder().encode("\x00\x00\x00\x00"), "AAAAAA=="],
];

test("[encoding/base64] testBase64EncodeString", () => {
for (const [input, output] of testsetString) {
assertEquals(encode(input), output);
}
});

test("[encoding/base64] testBase64DecodeString", () => {
for (const [input, output] of testsetString) {
assertEquals(decodeString(output), input);
}
});

test("[encoding/base64] testBase64EncodeBinary", () => {
for (const [input, output] of testsetBinary) {
assertEquals(encode(input), output);
}
});

test("[encoding/base64] testBase64DecodeBinary", () => {
for (const [input, output] of testsetBinary) {
const outputBinary = new Uint8Array(decode(output as string));
assertEquals(outputBinary, input as Uint8Array);
}
});

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