From b28f45aa0142e17f6ab834f12e452ae2b63a948d Mon Sep 17 00:00:00 2001
From: Feross Aboukhadijeh <feross@feross.org>
Date: Fri, 16 Feb 2018 00:12:41 -0800
Subject: [PATCH] Support Uint8Array arguments to buf.compare()
 (test-buffer-compare.js)

---
 index.js                         | 11 ++++++--
 test/node/test-buffer-compare.js | 48 ++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 2 deletions(-)
 create mode 100644 test/node/test-buffer-compare.js

diff --git a/index.js b/index.js
index 4b98dea..2dfbefe 100644
--- a/index.js
+++ b/index.js
@@ -306,8 +306,12 @@ Buffer.isBuffer = function isBuffer (b) {
 }
 
 Buffer.compare = function compare (a, b) {
+  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
+  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
   if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
-    throw new TypeError('Arguments must be Buffers')
+    throw new TypeError(
+      'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
+    )
   }
 
   if (a === b) return 0
@@ -368,7 +372,7 @@ Buffer.concat = function concat (list, length) {
   var pos = 0
   for (i = 0; i < list.length; ++i) {
     var buf = list[i]
-    if (ArrayBuffer.isView(buf)) {
+    if (isInstance(buf, Uint8Array)) {
       buf = Buffer.from(buf)
     }
     if (!Buffer.isBuffer(buf)) {
@@ -576,6 +580,9 @@ Buffer.prototype.inspect = function inspect () {
 }
 
 Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
+  if (isInstance(target, Uint8Array)) {
+    target = Buffer.from(target, target.offset, target.byteLength)
+  }
   if (!Buffer.isBuffer(target)) {
     throw new TypeError(
       'The "target" argument must be one of type Buffer or Uint8Array. ' +
diff --git a/test/node/test-buffer-compare.js b/test/node/test-buffer-compare.js
new file mode 100644
index 0000000..c5d2872
--- /dev/null
+++ b/test/node/test-buffer-compare.js
@@ -0,0 +1,48 @@
+'use strict';
+var Buffer = require('../../').Buffer;
+
+const common = require('./common');
+const assert = require('assert');
+
+const b = Buffer.alloc(1, 'a');
+const c = Buffer.alloc(1, 'c');
+const d = Buffer.alloc(2, 'aa');
+const e = new Uint8Array([ 0x61, 0x61 ]); // ASCII 'aa', same as d
+
+assert.strictEqual(b.compare(c), -1);
+assert.strictEqual(c.compare(d), 1);
+assert.strictEqual(d.compare(b), 1);
+assert.strictEqual(d.compare(e), 0);
+assert.strictEqual(b.compare(d), -1);
+assert.strictEqual(b.compare(b), 0);
+
+assert.strictEqual(Buffer.compare(b, c), -1);
+assert.strictEqual(Buffer.compare(c, d), 1);
+assert.strictEqual(Buffer.compare(d, b), 1);
+assert.strictEqual(Buffer.compare(b, d), -1);
+assert.strictEqual(Buffer.compare(c, c), 0);
+assert.strictEqual(Buffer.compare(e, e), 0);
+assert.strictEqual(Buffer.compare(d, e), 0);
+assert.strictEqual(Buffer.compare(d, b), 1);
+
+assert.strictEqual(Buffer.compare(Buffer.alloc(0), Buffer.alloc(0)), 0);
+assert.strictEqual(Buffer.compare(Buffer.alloc(0), Buffer.alloc(1)), -1);
+assert.strictEqual(Buffer.compare(Buffer.alloc(1), Buffer.alloc(0)), 1);
+
+const errMsg = common.expectsError({
+  code: 'ERR_INVALID_ARG_TYPE',
+  type: TypeError,
+  message: 'The "buf1", "buf2" arguments must be one of ' +
+             'type Buffer or Uint8Array'
+}, 2);
+assert.throws(() => Buffer.compare(Buffer.alloc(1), 'abc'), errMsg);
+
+assert.throws(() => Buffer.compare('abc', Buffer.alloc(1)), errMsg);
+
+common.expectsError(() => Buffer.alloc(1).compare('abc'), {
+  code: 'ERR_INVALID_ARG_TYPE',
+  type: TypeError,
+  message: 'The "target" argument must be one of ' +
+           'type Buffer or Uint8Array. Received type string'
+});
+
-- 
2.34.1