1 files changed, 84 insertions, 0 deletions
diff --git a/ext/node/polyfills/internal_binding/node_file.ts b/ext/node/polyfills/internal_binding/node_file.ts
new file mode 100644
index 000000000..742217b19
--- /dev/null
+++ b/ext/node/polyfills/internal_binding/node_file.ts
@@ -0,0 +1,84 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// This module ports:
+// - https://github.com/nodejs/node/blob/master/src/node_file-inl.h
+// - https://github.com/nodejs/node/blob/master/src/node_file.cc
+// - https://github.com/nodejs/node/blob/master/src/node_file.h
+
+import { assert } from "internal:deno_node/polyfills/_util/asserts.ts";
+
+/**
+ * Write to the given file from the given buffer synchronously.
+ *
+ * Implements sync part of WriteBuffer in src/node_file.cc
+ * See: https://github.com/nodejs/node/blob/e9ed113/src/node_file.cc#L1818
+ *
+ * @param fs file descriptor
+ * @param buffer the data to write
+ * @param offset where in the buffer to start from
+ * @param length how much to write
+ * @param position if integer, position to write at in the file. if null, write from the current position
+ * @param context context object for passing error number
+ */
+export function writeBuffer(
+  fd: number,
+  buffer: Uint8Array,
+  offset: number,
+  length: number,
+  position: number | null,
+  ctx: { errno?: number },
+) {
+  assert(offset >= 0, "offset should be greater or equal to 0");
+  assert(
+    offset + length <= buffer.byteLength,
+    `buffer doesn't have enough data: byteLength = ${buffer.byteLength}, offset + length = ${
+      offset +
+      length
+    }`,
+  );
+
+  if (position) {
+    Deno.seekSync(fd, position, Deno.SeekMode.Current);
+  }
+
+  const subarray = buffer.subarray(offset, offset + length);
+
+  try {
+    return Deno.writeSync(fd, subarray);
+  } catch (e) {
+    ctx.errno = extractOsErrorNumberFromErrorMessage(e);
+    return 0;
+  }
+}
+
+function extractOsErrorNumberFromErrorMessage(e: unknown): number {
+  const match = e instanceof Error
+    ? e.message.match(/\(os error (\d+)\)/)
+    : false;
+
+  if (match) {
+    return +match[1];
+  }
+
+  return 255; // Unknown error
+}