From 3ea5c212ef53fa9a8538482fc2427f9fb057e8cc Mon Sep 17 00:00:00 2001
From: Kevin Atkinson <k@kevina.org>
Date: Thu, 26 Jul 2018 12:49:34 -0400
Subject: [PATCH] Add maps for converting from the string repr. to the code and
 back.

---
 multibase.go      | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 multibase_test.go | 15 +++++++++++++++
 2 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/multibase.go b/multibase.go
index 4650376..478fa6d 100644
--- a/multibase.go
+++ b/multibase.go
@@ -12,7 +12,8 @@ import (
 // Encoding identifies the type of base-encoding that a multibase is carrying.
 type Encoding int
 
-// These are the supported encodings
+// These are the encodings specified in the standard, not are all
+// supported yet
 const (
 	Identity          = 0x00
 	Base1             = '1'
@@ -37,6 +38,48 @@ const (
 	Base64urlPad      = 'U'
 )
 
+// Encodigs is a map of the supported encoding, unsupported encoding
+// specified in standard are left out
+var Encodings = map[string]Encoding{
+	"identity":          0x00,
+	"base16":            'f',
+	"base16upper":       'F',
+	"base32":            'b',
+	"base32upper":       'B',
+	"base32pad":         'c',
+	"base32padupper":    'C',
+	"base32hex":         'v',
+	"base32hexupper":    'V',
+	"base32hexpad":      't',
+	"base32hexpadupper": 'T',
+	"base58flickr":      'Z',
+	"base58btc":         'z',
+	"base64":            'm',
+	"base64url":         'u',
+	"base64pad":         'M',
+	"base64urlpad":      'U',
+}
+
+var EncodingToStr = map[Encoding]string{
+	0x00: "identity",
+	'f':  "base16",
+	'F':  "base16upper",
+	'b':  "base32",
+	'B':  "base32upper",
+	'c':  "base32pad",
+	'C':  "base32padupper",
+	'v':  "base32hex",
+	'V':  "base32hexupper",
+	't':  "base32hexpad",
+	'T':  "base32hexpadupper",
+	'Z':  "base58flickr",
+	'z':  "base58btc",
+	'm':  "base64",
+	'u':  "base64url",
+	'M':  "base64pad",
+	'U':  "base64urlpad",
+}
+
 // ErrUnsupportedEncoding is returned when the selected encoding is not known or
 // implemented.
 var ErrUnsupportedEncoding = fmt.Errorf("selected encoding not supported")
diff --git a/multibase_test.go b/multibase_test.go
index a69d721..0b490df 100644
--- a/multibase_test.go
+++ b/multibase_test.go
@@ -6,6 +6,21 @@ import (
 	"testing"
 )
 
+func TestMap(t *testing.T) {
+	for s,e := range Encodings {
+		s2 := EncodingToStr[e]
+		if s != s2 {
+			t.Errorf("round trip failed on encoding map: %s != %s", s, s2)
+		}
+	}
+	for e,s := range EncodingToStr {
+		e2 := Encodings[s]
+		if e != e2 {
+			t.Errorf("round trip failed on encoding map: '%c' != '%c'", e, e2)
+		}
+	}
+}
+
 var sampleBytes = []byte("Decentralize everything!!!")
 var encodedSamples = map[Encoding]string{
 	Identity:          string(0x00) + "Decentralize everything!!!",