From 4d3f5ec67be2cb8467e0cbfca19bd82808ee8902 Mon Sep 17 00:00:00 2001
From: Kevin Atkinson <k@kevina.org>
Date: Tue, 29 Aug 2017 23:39:47 -0400
Subject: [PATCH] Fix StringOfBase to allow encoding CidV0 in alternative
 bases.

---
 cid-fmt/main.go | 4 ++--
 cid.go          | 7 ++++---
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/cid-fmt/main.go b/cid-fmt/main.go
index 7dacb8a..b106801 100644
--- a/cid-fmt/main.go
+++ b/cid-fmt/main.go
@@ -37,8 +37,8 @@ const fmtRef = `
    %s cid string encoded in base %b without multibase prefix
    %P cid prefix: %v-%c-%h-%L
 
-(1) For CID version 0 the multibase must be base58btc and no prefix is
-used.  For Cid version 1 the multibase prefix is included.
+(1) If the CID version is 0 and the multibase is base58btc no prefix
+is used.  For all other cases the multibase prefix is included.
 `
 
 func main() {
diff --git a/cid.go b/cid.go
index 72fa326..ee9f86a 100644
--- a/cid.go
+++ b/cid.go
@@ -299,10 +299,11 @@ func (c *Cid) String() string {
 func (c *Cid) StringOfBase(base mbase.Encoding) (string, error) {
 	switch c.version {
 	case 0:
-		if base != mbase.Base58BTC {
-			return "", ErrInvalidEncoding
+		if base == mbase.Base58BTC {
+			return c.hash.B58String(), nil
+		} else {
+			return mbase.Encode(base, c.bytesV0())
 		}
-		return c.hash.B58String(), nil
 	case 1:
 		return mbase.Encode(base, c.bytesV1())
 	default: