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zlib: avoid converting Uint8Array instances to Buffer #39492

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zlib: avoid converting Uint8Array instances to Buffer #39492

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zlib: avoid converting `Uint8Array` instances to `Buffer`
aduh95 Jul 22, 2021
22a8376
fixup! zlib: avoid converting `Uint8Array` instances to `Buffer`
aduh95 Jul 23, 2021
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9 changes: 4 additions & 5 deletions lib/zlib.js
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,6 @@ const {
ObjectDefineProperties,
ObjectDefineProperty,
ObjectFreeze,
ObjectGetPrototypeOf,
ObjectKeys,
ObjectSetPrototypeOf,
ReflectApply,
Expand All @@ -60,7 +59,8 @@ const {
} = require('internal/util');
const {
isArrayBufferView,
isAnyArrayBuffer
isAnyArrayBuffer,
isUint8Array,
} = require('internal/util/types');
const binding = internalBinding('zlib');
const assert = require('internal/assert');
Expand Down Expand Up @@ -112,10 +112,9 @@ for (const ckey of ObjectKeys(codes)) {

function zlibBuffer(engine, buffer, callback) {
validateFunction(callback, 'callback');
// Streams do not support non-Buffer ArrayBufferViews yet. Convert it to a
// Streams do not support non-Uint8Array ArrayBufferViews yet. Convert it to a
// Buffer without copying.
if (isArrayBufferView(buffer) &&
ObjectGetPrototypeOf(buffer) !== Buffer.prototype) {
if (isArrayBufferView(buffer) && !isUint8Array(buffer)) {
buffer = Buffer.from(buffer.buffer, buffer.byteOffset, buffer.byteLength);
} else if (isAnyArrayBuffer(buffer)) {
buffer = Buffer.from(buffer);
Expand Down