From fa50d2d01bca77391f5a1bd00c6c3bfb8cf9c6ea Mon Sep 17 00:00:00 2001
From: Jeromy <why@ipfs.io>
Date: Mon, 22 Aug 2016 17:37:43 -0700
Subject: [PATCH] basic implementation

---
 multibase.go      | 40 ++++++++++++++++++++++++++++++++++++++++
 multibase_test.go | 30 ++++++++++++++++++++++++++++++
 package.json      | 14 ++++++++++++++
 3 files changed, 84 insertions(+)
 create mode 100644 multibase.go
 create mode 100644 multibase_test.go
 create mode 100644 package.json

diff --git a/multibase.go b/multibase.go
new file mode 100644
index 0000000..8f1ce04
--- /dev/null
+++ b/multibase.go
@@ -0,0 +1,40 @@
+package multibase
+
+import (
+	"encoding/hex"
+	"fmt"
+
+	b58 "github.com/jbenet/go-base58"
+)
+
+const (
+	Base1        = '1'
+	Base2        = '0'
+	Base8        = '7'
+	Base10       = '9'
+	Base16       = 'f'
+	Base58Flickr = 'Z'
+	Base58BTC    = 'z'
+)
+
+var ErrUnsupportedEncoding = fmt.Errorf("selected encoding not supported")
+
+func Encode(base int, data []byte) (string, error) {
+	switch base {
+	case Base58BTC:
+		return string(Base58BTC) + b58.EncodeAlphabet(data, b58.BTCAlphabet), nil
+	case Base16:
+		return string(Base16) + hex.EncodeToString(data), nil
+	default:
+		return "", ErrUnsupportedEncoding
+	}
+}
+
+func Decode(data string) (int, []byte, error) {
+	switch data[0] {
+	case Base58BTC:
+		return Base58BTC, b58.DecodeAlphabet(data[1:], b58.BTCAlphabet), nil
+	default:
+		return -1, nil, ErrUnsupportedEncoding
+	}
+}
diff --git a/multibase_test.go b/multibase_test.go
new file mode 100644
index 0000000..5bb001e
--- /dev/null
+++ b/multibase_test.go
@@ -0,0 +1,30 @@
+package multibase
+
+import (
+	"bytes"
+	"math/rand"
+	"testing"
+)
+
+func TestBase58RoundTrip(t *testing.T) {
+	buf := make([]byte, 16)
+	rand.Read(buf)
+
+	enc, err := Encode(Base58BTC, buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	e, out, err := Decode(enc)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if e != Base58BTC {
+		t.Fatal("got wrong encoding out")
+	}
+
+	if !bytes.Equal(buf, out) {
+		t.Fatal("input wasnt the same as output", buf, out)
+	}
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..74467ff
--- /dev/null
+++ b/package.json
@@ -0,0 +1,14 @@
+{
+  "author": "whyrusleeping",
+  "bugs": {
+    "url": "https://github.com/multiformats/go-multibase"
+  },
+  "gx": {
+    "dvcsimport": "github.com/multiformats/go-multibase"
+  },
+  "gxVersion": "0.8.0",
+  "language": "go",
+  "license": "",
+  "name": "go-multibase",
+  "version": "0.0.0"
+}