string_decoder/test/parallel/test-string-decoder-end.js at main · unabandoned/string_decoder

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

// Verify that the string decoder works getting one byte at a time and the whole

// buffer at once, and that both match the .toString(enc) result of the entire

// buffer.

const { test } = require('node:test');

const assert = require('node:assert');

const { Buffer } = require('node:buffer');

const { StringDecoder } = require('../../');

const encodings = ['base64', 'hex', 'utf8', 'utf16le', 'ucs2'];

const bufs = ['☃💩', 'asdf'].map((b) => Buffer.from(b));

// Also test just arbitrary bytes from 0-15.

for (let i = 1; i <= 16; i++) {

bufs.push(Buffer.from(Array.from({ length: i }, (_, j) => j + 0x78)));

}

function checkBuf(encoding, buf) {

// Write one byte at a time.

let decoder = new StringDecoder(encoding);

let res1 = '';

for (let i = 0; i < buf.length; i++) {

res1 += decoder.write(buf.subarray(i, i + 1));

}

res1 += decoder.end();

// Write the whole buffer at once.

decoder = new StringDecoder(encoding);

let res2 = decoder.write(buf);

res2 += decoder.end();

// .toString() on the buffer.

const res3 = buf.toString(encoding);

assert.strictEqual(res1, res3, 'one byte at a time should match toString');

assert.strictEqual(res2, res3, 'all bytes at once should match toString');

}

for (const encoding of encodings) {

test(`${encoding}: chunked and whole-buffer writes match toString`, () => {

for (const buf of bufs) {

checkBuf(encoding, buf);

}

});

}

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