From c3a0d5f5d0eb7e15644ac6fd17a840a14df75229 Mon Sep 17 00:00:00 2001
From: codepage949 <codepage949@gmail.com>
Date: Mon, 28 Mar 2022 04:18:58 +0900
Subject: [PATCH] Add support for TypedArray input with byteOffset and length

---
 lib/input.js    |  2 +-
 test/unit/io.js | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/lib/input.js b/lib/input.js
index 1469bbae..de5cea60 100644
--- a/lib/input.js
+++ b/lib/input.js
@@ -39,7 +39,7 @@ function _createInputDescriptor (input, inputOptions, containerOptions) {
     if (input.length === 0) {
       throw Error('Input Bit Array is empty');
     }
-    inputDescriptor.buffer = Buffer.from(input.buffer);
+    inputDescriptor.buffer = Buffer.from(input.buffer, input.byteOffset, input.byteLength);
   } else if (is.plainObject(input) && !is.defined(inputOptions)) {
     // Plain Object descriptor, e.g. create
     inputOptions = input;
diff --git a/test/unit/io.js b/test/unit/io.js
index 67c0f246..c264644d 100644
--- a/test/unit/io.js
+++ b/test/unit/io.js
@@ -182,6 +182,24 @@ describe('Input/output', function () {
     assert.strictEqual(info.height, 1);
   });
 
+  it('Read from Uint8ClampedArray with byteOffset and output to Buffer', async () => {
+    // since a Uint8ClampedArray is the same as Uint8Array but clamps the values
+    // between 0-255 it seemed good to add this also
+    const uint8array = Uint8ClampedArray.from([0, 0, 0, 255, 255, 255, 0, 0, 0, 255, 255, 255]);
+    const uint8ArrayWithByteOffset = new Uint8ClampedArray(uint8array.buffer, 3, 6);
+    const { data, info } = await sharp(uint8ArrayWithByteOffset, {
+      raw: {
+        width: 2,
+        height: 1,
+        channels: 3
+      }
+    }).toBuffer({ resolveWithObject: true });
+
+    assert.deepStrictEqual(Uint8ClampedArray.from([255, 255, 255, 0, 0, 0]), new Uint8ClampedArray(data));
+    assert.strictEqual(info.width, 2);
+    assert.strictEqual(info.height, 1);
+  });
+
   it('Stream should emit info event', function (done) {
     const readable = fs.createReadStream(fixtures.inputJpg);
     const writable = fs.createWriteStream(outputJpg);