From bb93a5a51b7e306674fae9098f266401cc2cbe86 Mon Sep 17 00:00:00 2001
From: Dominic Tarr <dominic.tarr@gmail.com>
Date: Fri, 9 May 2014 00:35:55 +0200
Subject: [PATCH] export encodingLength

---
 index.js  |  3 ++-
 length.js | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 length.js

diff --git a/index.js b/index.js
index 1c4e803..a27770c 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,5 @@
 module.exports = {
     encode: require('./encode.js')
   , decode: require('./decode.js')
-}
\ No newline at end of file
+  , encodingLength: require('./length.js')
+}
diff --git a/length.js b/length.js
new file mode 100644
index 0000000..b3b26e0
--- /dev/null
+++ b/length.js
@@ -0,0 +1,21 @@
+
+var N1 = Math.pow(2,  7)
+var N2 = Math.pow(2, 14)
+var N3 = Math.pow(2, 21)
+var N4 = Math.pow(2, 28)
+var N5 = Math.pow(2, 35)
+var N6 = Math.pow(2, 42)
+var N7 = Math.pow(2, 49)
+
+module.exports = function (value) {
+  return (
+    value < N1 ? 1
+  : value < N2 ? 2
+  : value < N3 ? 3
+  : value < N4 ? 4
+  : value < N5 ? 5
+  : value < N6 ? 6
+  : value < N7 ? 7
+  :              8
+  )
+}