jimeh/go-base58
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Simplify exposed method API

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This package serves a single purpose, convert between integers and
base58 strings the same as a Flickr does. It has no need for supporting
custom alphabets passed in a runtime.
This commit is contained in:
Jim Myhrberg
2016-06-29 01:27:37 +01:00
parent 335c365133
commit 64e23a8d0c
2 changed files with 13 additions and 72 deletions
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50
base58.go
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@@ -8,46 +8,32 @@ import (
// Alphabet is the default alphabet.
const Alphabet = "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ"
const base = len(Alphabet)
// Encode converts a base10 integer to a base58 string using the default
// alphabet.
func Encode(num int) string {
return EncodeWithAlphabet(num, Alphabet)
str := ""
for num >= base {
mod := num % base
str = string(Alphabet[mod]) + str
num = (num - mod) / base
}
return string(Alphabet[num]) + str
}
// Decode converts a base58 string to a base10 integer using the default
// alphabet.
func Decode(str string) (int, error) {
return DecodeWithAlphabet(str, Alphabet)
}
// EncodeWithAlphabet converts a base10 integer to a base58 string with the
// given alphabet.
func EncodeWithAlphabet(num int, alphabet string) string {
base := len(alphabet)
str := ""
for num >= base {
mod := num % base
str = string(alphabet[mod]) + str
num = (num - mod) / base
}
return string(alphabet[num]) + str
}
// DecodeWithAlphabet converts a base58 string to a base10 integer with the
// given alphabet.
func DecodeWithAlphabet(str string, alphabet string) (int, error) {
base := len(alphabet)
num := 0
multi := 1
for i := len(str); i > 0; i-- {
char := string(str[i-1])
index := strings.Index(alphabet, char)
index := strings.Index(Alphabet, char)
if index == -1 {
return -1, decodeError(str, alphabet)
return -1, decodeError(str)
}
num += multi * index
multi = multi * base
@@ -56,17 +42,7 @@ func DecodeWithAlphabet(str string, alphabet string) (int, error) {
return num, nil
}
func decodeError(str string, alphabet string) error {
var msg string
if alphabet == Alphabet {
msg = fmt.Sprintf("\"%s\" is not a valid base58 string.", str)
} else {
msg = fmt.Sprintf(
"\"%s\" is not a valid input for alphabet \"%s\".",
str, alphabet,
)
}
func decodeError(str string) error {
msg := fmt.Sprintf("\"%s\" is not a valid base58 string.", str)
return errors.New(msg)
}