First pass at bufio.read tests.

Original: https://github.com/denoland/deno_std/commit/1eb57aa3948caf88e9064defc15e076b8a46fbd2

1 files changed, 1 insertions, 13 deletions

diff --git a/buffer.ts b/buffer.ts
index 1c4d68e98..a795bc842 100644
--- a/buffer.ts
+++ b/buffer.ts
@@ -4,7 +4,7 @@
 
 //import * as io from "./io";
 import { Reader, Writer, ReadResult } from "deno";
-import { assert } from "./util.ts";
+import { assert, copyBytes } from "./util.ts";
 
 // MIN_READ is the minimum ArrayBuffer size passed to a read call by
 // buffer.ReadFrom. As long as the Buffer has at least MIN_READ bytes beyond
@@ -13,18 +13,6 @@ import { assert } from "./util.ts";
 const MIN_READ = 512;
 const MAX_SIZE = 2 ** 32 - 2;
 
-// `off` is the offset into `dst` where it will at which to begin writing values
-// from `src`.
-// Returns the number of bytes copied.
-function copyBytes(dst: Uint8Array, src: Uint8Array, off = 0): number {
-  const r = dst.byteLength - off;
-  if (src.byteLength > r) {
-    src = src.subarray(0, r);
-  }
-  dst.set(src, off);
-  return src.byteLength;
-}
-
 /** A Buffer is a variable-sized buffer of bytes with read() and write()
  * methods. Based on https://golang.org/pkg/bytes/#Buffer
  */