1 files changed, 19 insertions, 0 deletions
diff --git a/llparse-builder/src/utils.ts b/llparse-builder/src/utils.ts
new file mode 100644
index 0000000..3521b20
--- /dev/null
+++ b/llparse-builder/src/utils.ts
@@ -0,0 +1,19 @@
+import * as assert from 'assert';
+import { Buffer } from 'buffer';
+
+/**
+ * Internal
+ */
+export function toBuffer(value: number | string | Buffer): Buffer {
+  let res: Buffer;
+  if (Buffer.isBuffer(value)) {
+    res = value;
+  } else if (typeof value === 'string') {
+    res = Buffer.from(value);
+  } else {
+    assert(0 <= value && value <= 0xff, 'Invalid byte value');
+    res = Buffer.from([ value ]);
+  }
+  assert(res.length >= 1, 'Invalid key length');
+  return res;
+}