benchmark: add benchmarks for encodings

Author: Uzlopak

benchmark/buffers/buffer-base64url-decode.js

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+'use strict';
+const assert = require('assert');
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  n: [32],
+  size: [8 << 20],
+});
+
+function main({ n, size }) {
+  const s = 'abcd'.repeat(size);
+  const encodedSize = s.length * 3 / 4;
+  // eslint-disable-next-line node-core/no-unescaped-regexp-dot
+  s.match(/./);  // Flatten string.
+  assert.strictEqual(s.length % 4, 0);
+  const b = Buffer.allocUnsafe(encodedSize);
+  b.write(s, 0, encodedSize, 'base64url');
+  bench.start();
+  for (let i = 0; i < n; i += 1) b.base64Write(s, 0, s.length);
+  bench.end(n);
+}

benchmark/buffers/buffer-base64url-encode.js

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+'use strict';
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  len: [64 * 1024 * 1024],
+  n: [32],
+}, {
+  test: { len: 256 },
+});
+
+function main({ n, len }) {
+  const b = Buffer.allocUnsafe(len);
+  let s = '';
+  let i;
+  for (i = 0; i < 256; ++i) s += String.fromCharCode(i);
+  for (i = 0; i < len; i += 256) b.write(s, i, 256, 'ascii');
+  bench.start();
+  for (i = 0; i < n; ++i) b.toString('base64url');
+  bench.end(n);
+}

benchmark/buffers/buffer-hex-decoded.js

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+'use strict';
+
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  len: [64, 1024],
+  n: [1e6],
+});
+
+function main({ len, n }) {
+  const buf = Buffer.alloc(len);
+
+  for (let i = 0; i < buf.length; i++)
+    buf[i] = i & 0xff;
+
+  const plain = buf;
+
+  bench.start();
+
+  for (let i = 0; i < n; i += 1)
+    plain.toString('hex');
+
+  bench.end(n);
+}