1 files changed, 159 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-buffer-swap.js b/tests/node_compat/test/parallel/test-buffer-swap.js
new file mode 100644
index 000000000..8e1315601
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-buffer-swap.js
@@ -0,0 +1,159 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+// Test buffers small enough to use the JS implementation
+{
+  const buf = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
+                           0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10]);
+
+  assert.strictEqual(buf, buf.swap16());
+  assert.deepStrictEqual(buf, Buffer.from([0x02, 0x01, 0x04, 0x03, 0x06, 0x05,
+                                           0x08, 0x07, 0x0a, 0x09, 0x0c, 0x0b,
+                                           0x0e, 0x0d, 0x10, 0x0f]));
+  buf.swap16(); // restore
+
+  assert.strictEqual(buf, buf.swap32());
+  assert.deepStrictEqual(buf, Buffer.from([0x04, 0x03, 0x02, 0x01, 0x08, 0x07,
+                                           0x06, 0x05, 0x0c, 0x0b, 0x0a, 0x09,
+                                           0x10, 0x0f, 0x0e, 0x0d]));
+  buf.swap32(); // restore
+
+  assert.strictEqual(buf, buf.swap64());
+  assert.deepStrictEqual(buf, Buffer.from([0x08, 0x07, 0x06, 0x05, 0x04, 0x03,
+                                           0x02, 0x01, 0x10, 0x0f, 0x0e, 0x0d,
+                                           0x0c, 0x0b, 0x0a, 0x09]));
+}
+
+// Operates in-place
+{
+  const buf = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7]);
+  buf.slice(1, 5).swap32();
+  assert.deepStrictEqual(buf, Buffer.from([0x1, 0x5, 0x4, 0x3, 0x2, 0x6, 0x7]));
+  buf.slice(1, 5).swap16();
+  assert.deepStrictEqual(buf, Buffer.from([0x1, 0x4, 0x5, 0x2, 0x3, 0x6, 0x7]));
+
+  // Length assertions
+  const re16 = /Buffer size must be a multiple of 16-bits/;
+  const re32 = /Buffer size must be a multiple of 32-bits/;
+  const re64 = /Buffer size must be a multiple of 64-bits/;
+
+  assert.throws(() => Buffer.from(buf).swap16(), re16);
+  assert.throws(() => Buffer.alloc(1025).swap16(), re16);
+  assert.throws(() => Buffer.from(buf).swap32(), re32);
+  assert.throws(() => buf.slice(1, 3).swap32(), re32);
+  assert.throws(() => Buffer.alloc(1025).swap32(), re32);
+  assert.throws(() => buf.slice(1, 3).swap64(), re64);
+  assert.throws(() => Buffer.alloc(1025).swap64(), re64);
+}
+
+{
+  const buf = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
+                           0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
+                           0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
+                           0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10]);
+
+  buf.slice(2, 18).swap64();
+
+  assert.deepStrictEqual(buf, Buffer.from([0x01, 0x02, 0x0a, 0x09, 0x08, 0x07,
+                                           0x06, 0x05, 0x04, 0x03, 0x02, 0x01,
+                                           0x10, 0x0f, 0x0e, 0x0d, 0x0c, 0x0b,
+                                           0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
+                                           0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
+                                           0x0f, 0x10]));
+}
+
+// Force use of native code (Buffer size above threshold limit for js impl)
+{
+  const bufData = new Uint32Array(256).fill(0x04030201);
+  const buf = Buffer.from(bufData.buffer, bufData.byteOffset);
+  const otherBufData = new Uint32Array(256).fill(0x03040102);
+  const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);
+  buf.swap16();
+  assert.deepStrictEqual(buf, otherBuf);
+}
+
+{
+  const bufData = new Uint32Array(256).fill(0x04030201);
+  const buf = Buffer.from(bufData.buffer);
+  const otherBufData = new Uint32Array(256).fill(0x01020304);
+  const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);
+  buf.swap32();
+  assert.deepStrictEqual(buf, otherBuf);
+}
+
+{
+  const bufData = new Uint8Array(256 * 8);
+  const otherBufData = new Uint8Array(256 * 8);
+  for (let i = 0; i < bufData.length; i++) {
+    bufData[i] = i % 8;
+    otherBufData[otherBufData.length - i - 1] = i % 8;
+  }
+  const buf = Buffer.from(bufData.buffer, bufData.byteOffset);
+  const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);
+  buf.swap64();
+  assert.deepStrictEqual(buf, otherBuf);
+}
+
+// Test native code with buffers that are not memory-aligned
+{
+  const bufData = new Uint8Array(256 * 8);
+  const otherBufData = new Uint8Array(256 * 8 - 2);
+  for (let i = 0; i < bufData.length; i++) {
+    bufData[i] = i % 2;
+  }
+  for (let i = 1; i < otherBufData.length; i++) {
+    otherBufData[otherBufData.length - i] = (i + 1) % 2;
+  }
+  const buf = Buffer.from(bufData.buffer, bufData.byteOffset);
+  // 0|1 0|1 0|1...
+  const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);
+  // 0|0 1|0 1|0...
+
+  buf.slice(1, buf.length - 1).swap16();
+  assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);
+}
+
+{
+  const bufData = new Uint8Array(256 * 8);
+  const otherBufData = new Uint8Array(256 * 8 - 4);
+  for (let i = 0; i < bufData.length; i++) {
+    bufData[i] = i % 4;
+  }
+  for (let i = 1; i < otherBufData.length; i++) {
+    otherBufData[otherBufData.length - i] = (i + 1) % 4;
+  }
+  const buf = Buffer.from(bufData.buffer, bufData.byteOffset);
+  // 0|1 2 3 0|1 2 3...
+  const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);
+  // 0|0 3 2 1|0 3 2...
+
+  buf.slice(1, buf.length - 3).swap32();
+  assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);
+}
+
+{
+  const bufData = new Uint8Array(256 * 8);
+  const otherBufData = new Uint8Array(256 * 8 - 8);
+  for (let i = 0; i < bufData.length; i++) {
+    bufData[i] = i % 8;
+  }
+  for (let i = 1; i < otherBufData.length; i++) {
+    otherBufData[otherBufData.length - i] = (i + 1) % 8;
+  }
+  const buf = Buffer.from(bufData.buffer, bufData.byteOffset);
+  // 0|1 2 3 4 5 6 7 0|1 2 3 4...
+  const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);
+  // 0|0 7 6 5 4 3 2 1|0 7 6 5...
+
+  buf.slice(1, buf.length - 7).swap64();
+  assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);
+}