add new multibase binary

Fix vet warnings about conversion of int to string

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "spec"]
+	path = spec
+	url = https://github.com/multiformats/multibase.git

.gx/lastpubver

@@ -1 +0,0 @@
-0.2.6: QmexBtiTTEwwn42Yi6ouKt6VqzpA6wjJgiW1oh9VfaRrup

.travis.yml

@@ -1,25 +1,31 @@
 os:
-    - linux
+  - linux
 
 language: go
 
 go:
-    - 1.8.3
+  - 1.11.x
+  - 1.15.x
 
+env:
+  global:
+    - GOTFLAGS="-race"
+  matrix:
+    - BUILD_DEPTYPE=gomod
+
+
+# disable travis install
 install:
-    - go get -u github.com/whyrusleeping/gx
+  - true
-    - go get -u github.com/whyrusleeping/gx-go
-    - gx install
-
 
 script:
-    - gx-go rewrite
+  - bash <(curl -s https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh)
-    - go test -race -coverprofile=unittest.coverprofile -covermode=atomic .
 
 
-after_success:
-    - bash <(curl -s https://codecov.io/bash) -f unittest.coverprofile -F unittest
-
 cache:
-    directories:
+  directories:
-        - $GOPATH/src/gx
+    - $GOPATH/pkg/mod
+    - /home/travis/.cache/go-build
+
+notifications:
+  email: false

Makefile

@@ -0,0 +1,7 @@
+test: deps
+	go test -count=1 -race -v ./...
+
+export IPFS_API ?= v04x.ipfs.io
+
+deps:
+	go get -t ./...

README.md

@@ -18,28 +18,6 @@
 go get github.com/multiformats/go-multibase
 ```
 
-Note that `go-multibase` is packaged with Gx, so it is recommended to use Gx to install and use it (see Usage section).
-
-## Usage
-
-This module is packaged with [Gx](https://github.com/whyrusleeping/gx). In order to use it in your own project it is recommended that you:
-
-```sh
-go get -u github.com/whyrusleeping/gx
-go get -u github.com/whyrusleeping/gx-go
-cd <your-project-repository>
-gx init
-gx import github.com/multiformats/go-multibase
-gx install --global
-gx-go --rewrite
-```
-
-Please check [Gx](https://github.com/whyrusleeping/gx) and [Gx-go](https://github.com/whyrusleeping/gx-go) documentation for more information.
-
-## Maintainers
-
-Captain: [@whyrusleeping](https://github.com/whyrusleeping).
-
 ## Contribute
 
 Contributions welcome. Please check out [the issues](https://github.com/multiformats/go-multibase/issues).

base16.go

@@ -6,15 +6,15 @@ func hexEncodeToStringUpper(src []byte) string {
 	return string(dst)
 }
 
-var hextableUpper = [16]byte{
+var hexTableUppers = [16]byte{
 	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
 	'A', 'B', 'C', 'D', 'E', 'F',
 }
 
 func hexEncodeUpper(dst, src []byte) int {
 	for i, v := range src {
-		dst[i*2] = hextableUpper[v>>4]
+		dst[i*2] = hexTableUppers[v>>4]
-		dst[i*2+1] = hextableUpper[v&0x0f]
+		dst[i*2+1] = hexTableUppers[v&0x0f]
 	}
 
 	return len(src) * 2

base2.go

@@ -0,0 +1,52 @@
+package multibase
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// binaryEncodeToString takes an array of bytes and returns
+// multibase binary representation
+func binaryEncodeToString(src []byte) string {
+	dst := make([]byte, len(src)*8)
+	encodeBinary(dst, src)
+	return string(dst)
+}
+
+// encodeBinary takes the src and dst bytes and converts each
+// byte to their binary rep using power reduction method
+func encodeBinary(dst []byte, src []byte) {
+	for i, b := range src {
+		for j := 0; j < 8; j++ {
+			if b&(1<<uint(7-j)) == 0 {
+				dst[i*8+j] = '0'
+			} else {
+				dst[i*8+j] = '1'
+			}
+		}
+	}
+}
+
+// decodeBinaryString takes multibase binary representation
+// and returns a byte array
+func decodeBinaryString(s string) ([]byte, error) {
+	if len(s)&7 != 0 {
+		// prepend the padding
+		s = strings.Repeat("0", 8-len(s)&7) + s
+	}
+
+	data := make([]byte, len(s)>>3)
+
+	for i, dstIndex := 0, 0; i < len(s); i = i + 8 {
+		value, err := strconv.ParseInt(s[i:i+8], 2, 0)
+		if err != nil {
+			return nil, fmt.Errorf("error while conversion: %s", err)
+		}
+
+		data[dstIndex] = byte(value)
+		dstIndex++
+	}
+
+	return data, nil
+}

base32.go

@@ -1,7 +1,7 @@
 package multibase
 
 import (
-	b32 "github.com/whyrusleeping/base32"
+	b32 "github.com/multiformats/go-base32"
 )
 
 var base32StdLowerPad = b32.NewEncodingCI("abcdefghijklmnopqrstuvwxyz234567")

encoder.go

@@ -0,0 +1,63 @@
+package multibase
+
+import (
+	"fmt"
+)
+
+// Encoder is a multibase encoding that is verified to be supported and
+// supports an Encode method that does not return an error
+type Encoder struct {
+	enc Encoding
+}
+
+// NewEncoder create a new Encoder from an Encoding
+func NewEncoder(base Encoding) (Encoder, error) {
+	_, ok := EncodingToStr[base]
+	if !ok {
+		return Encoder{-1}, fmt.Errorf("Unsupported multibase encoding: %d", base)
+	}
+	return Encoder{base}, nil
+}
+
+// MustNewEncoder is like NewEncoder but will panic if the encoding is
+// invalid.
+func MustNewEncoder(base Encoding) Encoder {
+	_, ok := EncodingToStr[base]
+	if !ok {
+		panic("Unsupported multibase encoding")
+	}
+	return Encoder{base}
+}
+
+// EncoderByName creates an encoder from a string, the string can
+// either be the multibase name or single character multibase prefix
+func EncoderByName(str string) (Encoder, error) {
+	var base Encoding
+	ok := true
+	if len(str) == 0 {
+		return Encoder{-1}, fmt.Errorf("Empty multibase encoding")
+	} else if len(str) == 1 {
+		base = Encoding(str[0])
+		_, ok = EncodingToStr[base]
+	} else {
+		base, ok = Encodings[str]
+	}
+	if !ok {
+		return Encoder{-1}, fmt.Errorf("Unsupported multibase encoding: %s", str)
+	}
+	return Encoder{base}, nil
+}
+
+func (p Encoder) Encoding() Encoding {
+	return p.enc
+}
+
+// Encode encodes the multibase using the given Encoder.
+func (p Encoder) Encode(data []byte) string {
+	str, err := Encode(p.enc, data)
+	if err != nil {
+		// should not happen
+		panic(err)
+	}
+	return str
+}

encoder_test.go

@@ -0,0 +1,51 @@
+package multibase
+
+import (
+	"testing"
+)
+
+func TestInvalidCode(t *testing.T) {
+	_, err := NewEncoder('q')
+	if err == nil {
+		t.Error("expected failure")
+	}
+}
+
+func TestInvalidName(t *testing.T) {
+	values := []string{"invalid", "", "q"}
+	for _, val := range values {
+		_, err := EncoderByName(val)
+		if err == nil {
+			t.Errorf("EncoderByName(%v) expected failure", val)
+		}
+	}
+}
+
+func TestEncoder(t *testing.T) {
+	for name, code := range Encodings {
+		encoder, err := NewEncoder(code)
+		if err != nil {
+			t.Fatal(err)
+		}
+		// Make sure the MustNewEncoder doesn't panic
+		MustNewEncoder(code)
+		str, err := Encode(code, sampleBytes)
+		if err != nil {
+			t.Fatal(err)
+		}
+		str2 := encoder.Encode(sampleBytes)
+		if str != str2 {
+			t.Errorf("encoded string mismatch: %s != %s", str, str2)
+		}
+		_, err = EncoderByName(name)
+		if err != nil {
+			t.Fatalf("EncoderByName(%s) failed: %v", name, err)
+		}
+		// Test that an encoder can be created from the single letter
+		// prefix
+		_, err = EncoderByName(str[0:1])
+		if err != nil {
+			t.Fatalf("EncoderByName(%s) failed: %v", str[0:1], err)
+		}
+	}
+}

go.mod

@@ -0,0 +1,10 @@
+module github.com/multiformats/go-multibase
+
+go 1.11
+
+require (
+	github.com/mr-tron/base58 v1.1.0
+	github.com/multiformats/go-base32 v0.0.3
+	github.com/multiformats/go-base36 v0.1.0
+	github.com/urfave/cli/v2 v2.3.0
+)

go.sum

@@ -0,0 +1,19 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/mr-tron/base58 v1.1.0 h1:Y51FGVJ91WBqCEabAi5OPUz38eAx8DakuAm5svLcsfQ=
+github.com/mr-tron/base58 v1.1.0/go.mod h1:xcD2VGqlgYjBdcBLw+TuYLr8afG+Hj8g2eTVqeSzSU8=
+github.com/multiformats/go-base32 v0.0.3 h1:tw5+NhuwaOjJCC5Pp82QuXbrmLzWg7uxlMFp8Nq/kkI=
+github.com/multiformats/go-base32 v0.0.3/go.mod h1:pLiuGC8y0QR3Ue4Zug5UzK9LjgbkL8NSQj0zQ5Nz/AA=
+github.com/multiformats/go-base36 v0.1.0 h1:JR6TyF7JjGd3m6FbLU2cOxhC0Li8z8dLNGQ89tUg4F4=
+github.com/multiformats/go-base36 v0.1.0/go.mod h1:kFGE83c6s80PklsHO9sRn2NCoffoRdUUOENyW/Vv6sM=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
+github.com/urfave/cli/v2 v2.3.0 h1:qph92Y649prgesehzOrQjdWyxFOp/QVM+6imKHad91M=
+github.com/urfave/cli/v2 v2.3.0/go.mod h1:LJmUH05zAU44vOAcrfzZQKsZbVcdbOG8rtL3/XcUArI=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

multibase-conv/main.go

@@ -14,8 +14,8 @@ func main() {
 	}
 
 	var newBase multibase.Encoding
-	if baseParm := os.Args[1]; len(baseParm) != 0 {
+	if baseParam := os.Args[1]; len(baseParam) != 0 {
-		newBase = multibase.Encoding(baseParm[0])
+		newBase = multibase.Encoding(baseParam[0])
 	} else {
 		fmt.Fprintln(os.Stderr, "<new-base> is empty")
 		os.Exit(1)

multibase.go

@@ -6,16 +6,17 @@ import (
 	"fmt"
 
 	b58 "github.com/mr-tron/base58/base58"
-	b32 "github.com/whyrusleeping/base32"
+	b32 "github.com/multiformats/go-base32"
+	b36 "github.com/multiformats/go-base36"
 )
 
 // 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'
 	Base2             = '0'
 	Base8             = '7'
 	Base10            = '9'
@@ -29,14 +30,49 @@ const (
 	Base32hexUpper    = 'V'
 	Base32hexPad      = 't'
 	Base32hexPadUpper = 'T'
-	Base58Flickr      = 'Z'
+	Base36            = 'k'
+	Base36Upper       = 'K'
 	Base58BTC         = 'z'
+	Base58Flickr      = 'Z'
 	Base64            = 'm'
 	Base64url         = 'u'
 	Base64pad         = 'M'
 	Base64urlPad      = 'U'
 )
 
+// EncodingToStr is a map of the supported encoding, unsupported encoding
+// specified in standard are left out
+var EncodingToStr = map[Encoding]string{
+	0x00: "identity",
+	'0':  "base2",
+	'f':  "base16",
+	'F':  "base16upper",
+	'b':  "base32",
+	'B':  "base32upper",
+	'c':  "base32pad",
+	'C':  "base32padupper",
+	'v':  "base32hex",
+	'V':  "base32hexupper",
+	't':  "base32hexpad",
+	'T':  "base32hexpadupper",
+	'k':  "base36",
+	'K':  "base36upper",
+	'z':  "base58btc",
+	'Z':  "base58flickr",
+	'm':  "base64",
+	'u':  "base64url",
+	'M':  "base64pad",
+	'U':  "base64urlpad",
+}
+
+var Encodings = map[string]Encoding{}
+
+func init() {
+	for e, n := range EncodingToStr {
+		Encodings[n] = e
+	}
+}
+
 // ErrUnsupportedEncoding is returned when the selected encoding is not known or
 // implemented.
 var ErrUnsupportedEncoding = fmt.Errorf("selected encoding not supported")
@@ -48,7 +84,9 @@ func Encode(base Encoding, data []byte) (string, error) {
 	switch base {
 	case Identity:
 		// 0x00 inside a string is OK in golang and causes no problems with the length calculation.
-		return string(Identity) + string(data), nil
+		return string(rune(Identity)) + string(data), nil
+	case Base2:
+		return string(Base2) + binaryEncodeToString(data), nil
 	case Base16:
 		return string(Base16) + hex.EncodeToString(data), nil
 	case Base16Upper:
@@ -69,6 +107,10 @@ func Encode(base Encoding, data []byte) (string, error) {
 		return string(Base32hexPad) + base32HexLowerPad.EncodeToString(data), nil
 	case Base32hexPadUpper:
 		return string(Base32hexPadUpper) + base32HexUpperPad.EncodeToString(data), nil
+	case Base36:
+		return string(Base36) + b36.EncodeToStringLc(data), nil
+	case Base36Upper:
+		return string(Base36Upper) + b36.EncodeToStringUc(data), nil
 	case Base58BTC:
 		return string(Base58BTC) + b58.EncodeAlphabet(data, b58.BTCAlphabet), nil
 	case Base58Flickr:
@@ -98,6 +140,9 @@ func Decode(data string) (Encoding, []byte, error) {
 	switch enc {
 	case Identity:
 		return Identity, []byte(data[1:]), nil
+	case Base2:
+		bytes, err := decodeBinaryString(data[1:])
+		return enc, bytes, err
 	case Base16, Base16Upper:
 		bytes, err := hex.DecodeString(data[1:])
 		return enc, bytes, err
@@ -113,6 +158,9 @@ func Decode(data string) (Encoding, []byte, error) {
 	case Base32hexPad, Base32hexPadUpper:
 		bytes, err := b32.HexEncoding.DecodeString(data[1:])
 		return enc, bytes, err
+	case Base36, Base36Upper:
+		bytes, err := b36.DecodeString(data[1:])
+		return enc, bytes, err
 	case Base58BTC:
 		bytes, err := b58.DecodeAlphabet(data[1:], b58.BTCAlphabet)
 		return Base58BTC, bytes, err

multibase/main.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"fmt"
+	"github.com/multiformats/go-multibase"
+	"io/ioutil"
+	"os"
+
+	"github.com/urfave/cli/v2"
+)
+
+func main() {
+	app := &cli.App{
+		Name:  "multibase",
+		Usage: "base encoding and transcoding tool",
+		Commands: []*cli.Command{
+			{
+				Name:      "encode",
+				ArgsUsage: "<base>",
+				Usage:     "encode data in multibase",
+				Flags: []cli.Flag{
+					&cli.PathFlag{
+						Name:    "input",
+						Aliases: []string{"i"},
+						Usage:   "the file that should be encoded",
+					},
+				},
+				Action: func(context *cli.Context) error {
+					if !context.Args().Present() || context.NArg() > 2 {
+						return cli.ShowCommandHelp(context, "")
+					}
+
+					p := context.Path("input")
+					if (p == "" && context.NArg() != 2) || (p != "" && context.NArg() != 1) {
+						return cli.ShowCommandHelp(context, "")
+					}
+
+					base, err := multibase.EncoderByName(context.Args().First())
+					if err != nil {
+						return err
+					}
+
+					if p != "" {
+						fileData, err := ioutil.ReadFile(p)
+						if err != nil {
+							return err
+						}
+						fmt.Println(base.Encode(fileData))
+						return nil
+					}
+
+					fmt.Println(base.Encode([]byte(context.Args().Get(1))))
+					return nil
+				},
+			},
+			{
+				Name:      "decode",
+				ArgsUsage: "<data>",
+				Usage:     "encode data in multibase",
+				Flags: []cli.Flag{
+					&cli.PathFlag{
+						Name:    "output",
+						Aliases: []string{"o"},
+						Usage:   "output decoded data to a file",
+					},
+				},
+				Action: func(context *cli.Context) error {
+					if context.NArg() != 1 {
+						return cli.ShowCommandHelp(context, "")
+					}
+
+					_, data, err := multibase.Decode(context.Args().First())
+					if err != nil {
+						return err
+					}
+
+					p := context.Path("output")
+					if p == "" {
+						fmt.Printf(string(data))
+						return nil
+					}
+					return ioutil.WriteFile(p, data, os.ModePerm)
+				},
+			},
+			{
+				Name:      "transcode",
+				ArgsUsage: "<new-base> <data>",
+				Usage:     "transcode multibase data",
+				Action: func(context *cli.Context) error {
+					if context.NArg() != 2 {
+						return cli.ShowCommandHelp(context, "")
+					}
+
+					newbase, err := multibase.EncoderByName(context.Args().Get(0))
+					if err != nil {
+						return err
+					}
+
+					_, data, err := multibase.Decode(context.Args().Get(1))
+					if err != nil {
+						return err
+					}
+
+					fmt.Println(newbase.Encode(data))
+					return nil
+				},
+			},
+		},
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		panic(err)
+	}
+}

multibase_test.go

@@ -3,12 +3,29 @@ package multibase
 import (
 	"bytes"
 	"math/rand"
+	"sort"
 	"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!!!",
+	Identity:          string(rune(0x00)) + "Decentralize everything!!!",
+	Base2:             "00100010001100101011000110110010101101110011101000111001001100001011011000110100101111010011001010010000001100101011101100110010101110010011110010111010001101000011010010110111001100111001000010010000100100001",
 	Base16:            "f446563656e7472616c697a652065766572797468696e67212121",
 	Base16Upper:       "F446563656E7472616C697A652065766572797468696E67212121",
 	Base32:            "birswgzloorzgc3djpjssazlwmvzhs5dinfxgoijbee",
@@ -19,7 +36,12 @@ var encodedSamples = map[Encoding]string{
 	Base32hexUpper:    "V8HIM6PBEEHP62R39F9II0PBMCLP7IT38D5N6E89144",
 	Base32hexPad:      "t8him6pbeehp62r39f9ii0pbmclp7it38d5n6e89144======",
 	Base32hexPadUpper: "T8HIM6PBEEHP62R39F9II0PBMCLP7IT38D5N6E89144======",
+	Base36:            "km552ng4dabi4neu1oo8l4i5mndwmpc3mkukwtxy9",
+	Base36Upper:       "KM552NG4DABI4NEU1OO8L4I5MNDWMPC3MKUKWTXY9",
 	Base58BTC:         "z36UQrhJq9fNDS7DiAHM9YXqDHMPfr4EMArvt",
+	Base58Flickr:      "Z36tpRGiQ9Endr7dHahm9xwQdhmoER4emaRVT",
+	Base64:            "mRGVjZW50cmFsaXplIGV2ZXJ5dGhpbmchISE",
+	Base64url:         "uRGVjZW50cmFsaXplIGV2ZXJ5dGhpbmchISE",
 	Base64pad:         "MRGVjZW50cmFsaXplIGV2ZXJ5dGhpbmchISE=",
 	Base64urlPad:      "URGVjZW50cmFsaXplIGV2ZXJ5dGhpbmchISE=",
 }
@@ -31,7 +53,7 @@ func testEncode(t *testing.T, encoding Encoding, bytes []byte, expected string)
 		return
 	}
 	if actual != expected {
-		t.Errorf("encoding failed for %c (%d), expected: %s, got: %s", encoding, encoding, expected, actual)
+		t.Errorf("encoding failed for %c (%d / %s), expected: %s, got: %s", encoding, encoding, EncodingToStr[encoding], expected, actual)
 	}
 }
 
@@ -50,78 +72,178 @@ func testDecode(t *testing.T, expectedEncoding Encoding, expectedBytes []byte, d
 }
 
 func TestEncode(t *testing.T) {
-	for encoding, data := range encodedSamples {
+	for encoding := range EncodingToStr {
-		testEncode(t, encoding, sampleBytes, data)
+		testEncode(t, encoding, sampleBytes, encodedSamples[encoding])
 	}
 }
 
 func TestDecode(t *testing.T) {
-	for encoding, data := range encodedSamples {
+	for encoding := range EncodingToStr {
-		testDecode(t, encoding, sampleBytes, data)
+		testDecode(t, encoding, sampleBytes, encodedSamples[encoding])
 	}
 }
 
 func TestRoundTrip(t *testing.T) {
-	buf := make([]byte, 17)
-	rand.Read(buf)
 
-	baseList := []Encoding{Identity, Base16, Base32, Base32hex, Base32pad, Base32hexPad, Base58BTC, Base58Flickr, Base64pad, Base64urlPad}
+	for base := range EncodingToStr {
-
+		if int(base) == 0 {
-	for _, base := range baseList {
+			// skip identity: any byte goes there
-		enc, err := Encode(base, buf)
+			continue
-		if err != nil {
-			t.Fatal(err)
 		}
 
-		e, out, err := Decode(enc)
+		_, _, err := Decode(string(rune(base)) + "\u00A0")
-		if err != nil {
+		if err == nil {
-			t.Fatal(err)
+			t.Fatal(EncodingToStr[base] + " decode should fail on low-unicode")
 		}
 
-		if e != base {
+		_, _, err = Decode(string(rune(base)) + "\u1F4A8")
-			t.Fatal("got wrong encoding out")
+		if err == nil {
+			t.Fatal(EncodingToStr[base] + " decode should fail on emoji")
 		}
 
-		if !bytes.Equal(buf, out) {
+		_, _, err = Decode(string(rune(base)) + "!")
-			t.Fatal("input wasnt the same as output", buf, out)
+		if err == nil {
+			t.Fatal(EncodingToStr[base] + " decode should fail on punctuation")
+		}
+
+		_, _, err = Decode(string(rune(base)) + "\xA0")
+		if err == nil {
+			t.Fatal(EncodingToStr[base] + " decode should fail on high-latin1")
+		}
+	}
+
+	buf := make([]byte, 137+16) // sufficiently large prime number of bytes + another 16 to test leading 0s
+	rand.Read(buf[16:])
+
+	for base := range EncodingToStr {
+
+		// test roundtrip from the full zero-prefixed buffer down to a single byte
+		for i := 0; i < len(buf); i++ {
+
+			// use a copy to verify we are not overwriting the supplied buffer
+			newBuf := make([]byte, len(buf)-i)
+			copy(newBuf, buf[i:])
+
+			enc, err := Encode(base, newBuf)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			e, out, err := Decode(enc)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if e != base {
+				t.Fatal("got wrong encoding out")
+			}
+
+			if !bytes.Equal(newBuf, buf[i:]) {
+				t.Fatal("the provided buffer was modified", buf[i:], out)
+			}
+
+			if !bytes.Equal(buf[i:], out) {
+				t.Fatal("input wasnt the same as output", buf[i:], out)
+			}
+
+			// When we have 3 leading zeroes, do a few extra tests
+			// ( choice of leading zeroes is arbitrary - just cutting down on test permutations )
+
+			if i == 13 {
+
+				// if this is a case-insensitive codec semi-randomly swap case in enc and try again
+				name := EncodingToStr[base]
+				if name[len(name)-5:] == "upper" || Encodings[name+"upper"] > 0 {
+					caseTamperedEnc := []byte(enc)
+
+					for _, j := range []int{3, 5, 8, 13, 21, 23, 29, 47, 52} {
+						if caseTamperedEnc[j] >= 65 && caseTamperedEnc[j] <= 90 {
+							caseTamperedEnc[j] += 32
+						} else if caseTamperedEnc[j] >= 97 && caseTamperedEnc[j] <= 122 {
+							caseTamperedEnc[j] -= 32
+						}
+					}
+
+					e, out, err := Decode(string(caseTamperedEnc))
+					if err != nil {
+						t.Fatal(err)
+					}
+
+					if e != base {
+						t.Fatal("got wrong encoding out")
+					}
+					if !bytes.Equal(buf[i:], out) {
+						t.Fatal("input wasn't the same as output", buf[i:], out)
+					}
+				}
+			}
+		}
+	}
+
+	// Test that nothing overflows
+	maxValueBuf := make([]byte, 131)
+	for i := 0; i < len(maxValueBuf); i++ {
+		maxValueBuf[i] = 0xFF
+	}
+
+	for base := range EncodingToStr {
+
+		// test roundtrip from the complete buffer down to a single byte
+		for i := 0; i < len(maxValueBuf); i++ {
+
+			enc, err := Encode(base, maxValueBuf[i:])
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			e, out, err := Decode(enc)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if e != base {
+				t.Fatal("got wrong encoding out")
+			}
+
+			if !bytes.Equal(maxValueBuf[i:], out) {
+				t.Fatal("input wasn't the same as output", maxValueBuf[i:], out)
+			}
 		}
 	}
 
 	_, _, err := Decode("")
 	if err == nil {
-		t.Fatal("shouldnt be able to decode empty string")
+		t.Fatal("shouldn't be able to decode empty string")
 	}
 }
 
+var benchmarkBuf [36]byte // typical CID size
+var benchmarkCodecs []string
+
+func init() {
+	rand.Read(benchmarkBuf[:])
+
+	benchmarkCodecs = make([]string, 0, len(Encodings))
+	for n := range Encodings {
+
+		// // Only bench b36 and b58
+		// if len(n) < 6 || (n[4:6] != "36" && n[4:6] != "58") {
+		// 	continue
+		// }
+
+		benchmarkCodecs = append(benchmarkCodecs, n)
+	}
+	sort.Strings(benchmarkCodecs)
+}
+
 func BenchmarkRoundTrip(b *testing.B) {
-	buf := make([]byte, 32)
-	rand.Read(buf)
 	b.ResetTimer()
 
-	bases := map[string]Encoding{
+	for _, name := range benchmarkCodecs {
-		"Identity":          Identity,
-		"Base16":            Base16,
-		"Base16Upper":       Base16Upper,
-		"Base32":            Base32,
-		"Base32Upper":       Base32Upper,
-		"Base32pad":         Base32pad,
-		"Base32padUpper":    Base32padUpper,
-		"Base32hex":         Base32hex,
-		"Base32hexUpper":    Base32hexUpper,
-		"Base32hexPad":      Base32hexPad,
-		"Base32hexPadUpper": Base32hexPadUpper,
-		"Base58Flickr":      Base58Flickr,
-		"Base58BTC":         Base58BTC,
-		"Base64":            Base64,
-		"Base64url":         Base64url,
-		"Base64pad":         Base64pad,
-		"Base64urlPad":      Base64urlPad,
-	}
-
-	for name, base := range bases {
 		b.Run(name, func(b *testing.B) {
+			base := Encodings[name]
 			for i := 0; i < b.N; i++ {
-				enc, err := Encode(base, buf)
+				enc, err := Encode(base, benchmarkBuf[:])
 				if err != nil {
 					b.Fatal(err)
 				}
@@ -135,8 +257,40 @@ func BenchmarkRoundTrip(b *testing.B) {
 					b.Fatal("got wrong encoding out")
 				}
 
-				if !bytes.Equal(buf, out) {
+				if !bytes.Equal(benchmarkBuf[:], out) {
-					b.Fatal("input wasnt the same as output", buf, out)
+					b.Fatal("input wasnt the same as output", benchmarkBuf, out)
+				}
+			}
+		})
+	}
+}
+
+func BenchmarkEncode(b *testing.B) {
+	b.ResetTimer()
+
+	for _, name := range benchmarkCodecs {
+		b.Run(name, func(b *testing.B) {
+			base := Encodings[name]
+			for i := 0; i < b.N; i++ {
+				_, err := Encode(base, benchmarkBuf[:])
+				if err != nil {
+					b.Fatal(err)
+				}
+			}
+		})
+	}
+}
+
+func BenchmarkDecode(b *testing.B) {
+	b.ResetTimer()
+
+	for _, name := range benchmarkCodecs {
+		b.Run(name, func(b *testing.B) {
+			enc, _ := Encode(Encodings[name], benchmarkBuf[:])
+			for i := 0; i < b.N; i++ {
+				_, _, err := Decode(enc)
+				if err != nil {
+					b.Fatal(err)
 				}
 			}
 		})

package.json

@@ -3,28 +3,8 @@
   "bugs": {
     "url": "https://github.com/multiformats/go-multibase"
   },
-  "gx": {
-    "dvcsimport": "github.com/multiformats/go-multibase"
-  },
-  "gxDependencies": [
-    {
-      "author": "whyrusleeping",
-      "hash": "QmfVj3x4D6Jkq9SEoi5n2NmoUomLwoeiwnYz2KQa15wRw6",
-      "name": "base32",
-      "version": "0.0.2"
-    },
-    {
-      "author": "mr-tron",
-      "hash": "QmWFAMPqsEyUX7gDUsRVmMWz59FxSpJ1b2v6bJ1yYzo7jY",
-      "name": "go-base58-fast",
-      "version": "0.1.1"
-    }
-  ],
-  "gxVersion": "0.8.0",
   "language": "go",
   "license": "",
   "name": "go-multibase",
-  "releaseCmd": "git commit -a -m \"gx publish $VERSION\"",
+  "version": "0.3.0"
-  "version": "0.2.6"
 }
-

spec_test.go

@@ -0,0 +1,147 @@
+package multibase
+
+import (
+	"encoding/csv"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"testing"
+	"unicode/utf8"
+)
+
+func TestSpec(t *testing.T) {
+	file, err := os.Open("spec/multibase.csv")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer file.Close()
+
+	reader := csv.NewReader(file)
+	reader.LazyQuotes = false
+	reader.FieldsPerRecord = 4
+	reader.TrimLeadingSpace = true
+
+	values, err := reader.ReadAll()
+	if err != nil {
+		t.Error(err)
+	}
+	expectedEncodings := make(map[Encoding]string, len(values)-1)
+	for _, v := range values[1:] {
+		encoding := v[0]
+		codeStr := v[1]
+
+		var code Encoding
+		if strings.HasPrefix(codeStr, "0x") {
+			i, err := strconv.ParseUint(codeStr[2:], 16, 64)
+			if err != nil {
+				t.Errorf("invalid multibase byte %q", codeStr)
+				continue
+			}
+			code = Encoding(i)
+		} else {
+			codeRune, length := utf8.DecodeRuneInString(codeStr)
+			if code == utf8.RuneError {
+				t.Errorf("multibase %q wasn't valid utf8", codeStr)
+				continue
+			}
+			if length != len(codeStr) {
+				t.Errorf("multibase %q wasn't a single character", codeStr)
+				continue
+			}
+			code = Encoding(codeRune)
+		}
+		expectedEncodings[code] = encoding
+	}
+
+	for name, enc := range Encodings {
+		expectedName, ok := expectedEncodings[enc]
+		if !ok {
+			t.Errorf("encoding %q (%c) not defined in the spec", name, enc)
+			continue
+		}
+		if expectedName != name {
+			t.Errorf("encoding %q (%c) has unexpected name %q", expectedName, enc, name)
+		}
+	}
+}
+func TestSpecVectors(t *testing.T) {
+	files, err := filepath.Glob("spec/tests/test[0-9]*.csv")
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, fname := range files {
+		t.Run(fname, func(t *testing.T) {
+			file, err := os.Open(fname)
+			if err != nil {
+				t.Error(err)
+				return
+			}
+			defer file.Close()
+			reader := csv.NewReader(file)
+			reader.LazyQuotes = false
+			reader.FieldsPerRecord = 2
+			reader.TrimLeadingSpace = true
+
+			values, err := reader.ReadAll()
+			if err != nil {
+				t.Error(err)
+			}
+			if len(values) == 0 {
+				t.Error("no test values")
+				return
+			}
+			header := values[0]
+
+			var decodeOnly bool
+			switch header[0] {
+			case "encoding":
+			case "non-canonical encoding":
+				decodeOnly = true
+			default:
+				t.Errorf("invalid test spec %q", fname)
+				return
+			}
+
+			testValue, err := strconv.Unquote("\"" + header[1] + "\"")
+			if err != nil {
+				t.Error("failed to unquote testcase:", err)
+				return
+			}
+
+			for _, testCase := range values[1:] {
+				encodingName := testCase[0]
+				expected := testCase[1]
+
+				t.Run(encodingName, func(t *testing.T) {
+					encoder, err := EncoderByName(encodingName)
+					if err != nil {
+						t.Skipf("skipping %s: not supported", encodingName)
+						return
+					}
+					if !decodeOnly {
+						t.Logf("encoding %q with %s", testValue, encodingName)
+						actual := encoder.Encode([]byte(testValue))
+						if expected != actual {
+							t.Errorf("expected %q, got %q", expected, actual)
+						}
+					}
+					t.Logf("decoding %q", expected)
+					encoding, decoded, err := Decode(expected)
+					if err != nil {
+						t.Error("failed to decode:", err)
+						return
+					}
+					expectedEncoding := Encodings[encodingName]
+					if encoding != expectedEncoding {
+						t.Errorf("expected encoding to be %c, got %c", expectedEncoding, encoding)
+					}
+					if string(decoded) != testValue {
+						t.Errorf("failed to decode %q to %q, got %q", expected, testValue, string(decoded))
+					}
+				})
+
+			}
+		})
+	}
+}