feat(node): buffer isUtf8/isAscii (#23928)

Fixes: https://github.com/denoland/deno/issues/23657

Implements `isUtf8` and `isAscii` as ops.

1 files changed, 13 insertions, 0 deletions

diff --git a/ext/node/ops/buffer.rs b/ext/node/ops/buffer.rs
new file mode 100644
index 000000000..74a011ab8
--- /dev/null
+++ b/ext/node/ops/buffer.rs
@@ -0,0 +1,13 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+use deno_core::op2;
+
+#[op2(fast)]
+pub fn op_is_ascii(#[buffer] buf: &[u8]) -> bool {
+  buf.is_ascii()
+}
+
+#[op2(fast)]
+pub fn op_is_utf8(#[buffer] buf: &[u8]) -> bool {
+  std::str::from_utf8(buf).is_ok()
+}