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feat(encoding): add base64 (denoland/deno#5811)
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license. | ||
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/** | ||
* 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]); | ||
} | ||
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return window.btoa(dataString); | ||
} | ||
} | ||
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/** | ||
* 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); | ||
} | ||
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return binary.buffer; | ||
} | ||
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/** | ||
* Decodes data assuming the output is in string type | ||
* @param data input to decode | ||
*/ | ||
export function decodeString(data: string): string { | ||
return window.atob(data); | ||
} |
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license. | ||
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const { test } = Deno; | ||
import { assertEquals } from "../testing/asserts.ts"; | ||
import { encode, decode, decodeString } from "./base64.ts"; | ||
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const testsetString = [ | ||
["", ""], | ||
["f", "Zg=="], | ||
["fo", "Zm8="], | ||
["foo", "Zm9v"], | ||
["foob", "Zm9vYg=="], | ||
["fooba", "Zm9vYmE="], | ||
["foobar", "Zm9vYmFy"], | ||
]; | ||
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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=="], | ||
]; | ||
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test("[encoding/base64] testBase64EncodeString", () => { | ||
for (const [input, output] of testsetString) { | ||
assertEquals(encode(input), output); | ||
} | ||
}); | ||
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test("[encoding/base64] testBase64DecodeString", () => { | ||
for (const [input, output] of testsetString) { | ||
assertEquals(decodeString(output), input); | ||
} | ||
}); | ||
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test("[encoding/base64] testBase64EncodeBinary", () => { | ||
for (const [input, output] of testsetBinary) { | ||
assertEquals(encode(input), output); | ||
} | ||
}); | ||
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test("[encoding/base64] testBase64DecodeBinary", () => { | ||
for (const [input, output] of testsetBinary) { | ||
const outputBinary = new Uint8Array(decode(output as string)); | ||
assertEquals(outputBinary, input as Uint8Array); | ||
} | ||
}); |