base58
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@ -32,7 +32,13 @@ echo ""
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git add --verbose .
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git commit -a -m "v${next_ver}"
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msg="v${next_ver}"
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if [ $# -gt 0 ]; then
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msg="$1"
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fi
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git commit -a -m "${msg}"
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git tag "v${next_ver}"
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178
langext/base58.go
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178
langext/base58.go
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@ -0,0 +1,178 @@
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package langext
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import (
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"bytes"
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"errors"
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"math/big"
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)
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// shamelessly stolen from https://github.com/btcsuite/
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type B58Encoding struct {
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bigRadix [11]*big.Int
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bigRadix10 *big.Int
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alphabet string
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alphabetIdx0 byte
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b58 [256]byte
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}
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var Base58DefaultEncoding = newBase58Encoding("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")
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var Base58FlickrEncoding = newBase58Encoding("123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ")
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var Base58RippleEncoding = newBase58Encoding("rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz")
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var Base58BitcoinEncoding = newBase58Encoding("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")
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func newBase58Encoding(alphabet string) *B58Encoding {
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bigRadix10 := big.NewInt(58 * 58 * 58 * 58 * 58 * 58 * 58 * 58 * 58 * 58)
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enc := &B58Encoding{
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alphabet: alphabet,
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alphabetIdx0: '1',
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bigRadix: [...]*big.Int{
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big.NewInt(0),
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big.NewInt(58),
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big.NewInt(58 * 58),
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big.NewInt(58 * 58 * 58),
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big.NewInt(58 * 58 * 58 * 58),
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big.NewInt(58 * 58 * 58 * 58 * 58),
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big.NewInt(58 * 58 * 58 * 58 * 58 * 58),
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big.NewInt(58 * 58 * 58 * 58 * 58 * 58 * 58),
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big.NewInt(58 * 58 * 58 * 58 * 58 * 58 * 58 * 58),
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big.NewInt(58 * 58 * 58 * 58 * 58 * 58 * 58 * 58 * 58),
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bigRadix10,
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},
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bigRadix10: bigRadix10,
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}
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b58 := make([]byte, 0, 256)
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for i := byte(0); i < 32; i++ {
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for j := byte(0); j < 8; j++ {
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b := i*8 + j
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idx := bytes.IndexByte([]byte(alphabet), b)
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if idx == -1 {
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b58 = append(b58, 255)
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} else {
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b58 = append(b58, byte(idx))
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}
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}
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}
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enc.b58 = *((*[256]byte)(b58))
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return enc
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}
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func (enc *B58Encoding) EncodeString(src string) (string, error) {
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v, err := enc.Encode([]byte(src))
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if err != nil {
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return "", err
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}
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return string(v), nil
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}
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func (enc *B58Encoding) Encode(src []byte) ([]byte, error) {
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x := new(big.Int)
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x.SetBytes(src)
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// maximum length of output is log58(2^(8*len(b))) == len(b) * 8 / log(58)
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maxlen := int(float64(len(src))*1.365658237309761) + 1
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answer := make([]byte, 0, maxlen)
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mod := new(big.Int)
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for x.Sign() > 0 {
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// Calculating with big.Int is slow for each iteration.
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// x, mod = x / 58, x % 58
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//
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// Instead we can try to do as much calculations on int64.
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// x, mod = x / 58^10, x % 58^10
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//
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// Which will give us mod, which is 10 digit base58 number.
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// We'll loop that 10 times to convert to the answer.
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x.DivMod(x, enc.bigRadix10, mod)
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if x.Sign() == 0 {
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// When x = 0, we need to ensure we don't add any extra zeros.
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m := mod.Int64()
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for m > 0 {
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answer = append(answer, enc.alphabet[m%58])
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m /= 58
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}
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} else {
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m := mod.Int64()
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for i := 0; i < 10; i++ {
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answer = append(answer, enc.alphabet[m%58])
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m /= 58
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}
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}
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}
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// leading zero bytes
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for _, i := range src {
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if i != 0 {
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break
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}
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answer = append(answer, enc.alphabetIdx0)
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}
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// reverse
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alen := len(answer)
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for i := 0; i < alen/2; i++ {
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answer[i], answer[alen-1-i] = answer[alen-1-i], answer[i]
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}
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return answer, nil
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}
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func (enc *B58Encoding) DecodeString(src string) (string, error) {
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v, err := enc.Decode([]byte(src))
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if err != nil {
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return "", err
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}
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return string(v), nil
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}
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func (enc *B58Encoding) Decode(src []byte) ([]byte, error) {
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answer := big.NewInt(0)
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scratch := new(big.Int)
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for t := src; len(t) > 0; {
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n := len(t)
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if n > 10 {
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n = 10
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}
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total := uint64(0)
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for _, v := range t[:n] {
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if v > 255 {
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return []byte{}, errors.New("invalid char in input")
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}
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tmp := enc.b58[v]
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if tmp == 255 {
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return []byte{}, errors.New("invalid char in input")
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}
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total = total*58 + uint64(tmp)
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}
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answer.Mul(answer, enc.bigRadix[n])
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scratch.SetUint64(total)
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answer.Add(answer, scratch)
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t = t[n:]
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}
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tmpval := answer.Bytes()
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var numZeros int
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for numZeros = 0; numZeros < len(src); numZeros++ {
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if src[numZeros] != enc.alphabetIdx0 {
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break
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}
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}
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flen := numZeros + len(tmpval)
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val := make([]byte, flen)
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copy(val[numZeros:], tmpval)
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return val, nil
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}
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67
langext/base58_test.go
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67
langext/base58_test.go
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@ -0,0 +1,67 @@
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package langext
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import (
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"testing"
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)
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func _encStr(t *testing.T, enc *B58Encoding, v string) string {
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v, err := enc.EncodeString(v)
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if err != nil {
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t.Error(err)
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}
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return v
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}
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func _decStr(t *testing.T, enc *B58Encoding, v string) string {
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v, err := enc.DecodeString(v)
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if err != nil {
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t.Error(err)
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}
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return v
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}
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func TestBase58DefaultEncoding(t *testing.T) {
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assertEqual(t, _encStr(t, Base58DefaultEncoding, "Hello"), "9Ajdvzr")
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assertEqual(t, _encStr(t, Base58DefaultEncoding, "If debugging is the process of removing software bugs, then programming must be the process of putting them in."), "48638SMcJuah5okqPx4kCVf5d8QAdgbdNf28g7ReY13prUENNbMyssjq5GjsrJHF5zeZfqs4uJMUJHr7VbrU4XBUZ2Fw9DVtqtn9N1eXucEWSEZahXV6w4ysGSWqGdpeYTJf1MdDzTg8vfcQViifJjZX")
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}
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func TestBase58DefaultDecoding(t *testing.T) {
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assertEqual(t, _decStr(t, Base58DefaultEncoding, "9Ajdvzr"), "Hello")
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assertEqual(t, _decStr(t, Base58DefaultEncoding, "48638SMcJuah5okqPx4kCVf5d8QAdgbdNf28g7ReY13prUENNbMyssjq5GjsrJHF5zeZfqs4uJMUJHr7VbrU4XBUZ2Fw9DVtqtn9N1eXucEWSEZahXV6w4ysGSWqGdpeYTJf1MdDzTg8vfcQViifJjZX"), "If debugging is the process of removing software bugs, then programming must be the process of putting them in.")
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}
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func TestBase58RippleEncoding(t *testing.T) {
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assertEqual(t, _encStr(t, Base58RippleEncoding, "Hello"), "9wjdvzi")
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assertEqual(t, _encStr(t, Base58RippleEncoding, "If debugging is the process of removing software bugs, then programming must be the process of putting them in."), "h3as3SMcJu26nokqPxhkUVCnd3Qwdgbd4Cp3gfReYrsFi7N44bMy11jqnGj1iJHEnzeZCq1huJM7JHifVbi7hXB7ZpEA9DVtqt894reXucNWSNZ26XVaAhy1GSWqGdFeYTJCrMdDzTg3vCcQV55CJjZX")
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}
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func TestBase58RippleDecoding(t *testing.T) {
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assertEqual(t, _decStr(t, Base58RippleEncoding, "9wjdvzi"), "Hello")
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assertEqual(t, _decStr(t, Base58RippleEncoding, "h3as3SMcJu26nokqPxhkUVCnd3Qwdgbd4Cp3gfReYrsFi7N44bMy11jqnGj1iJHEnzeZCq1huJM7JHifVbi7hXB7ZpEA9DVtqt894reXucNWSNZ26XVaAhy1GSWqGdFeYTJCrMdDzTg3vCcQV55CJjZX"), "If debugging is the process of removing software bugs, then programming must be the process of putting them in.")
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}
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func TestBase58BitcoinEncoding(t *testing.T) {
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assertEqual(t, _encStr(t, Base58BitcoinEncoding, "Hello"), "9Ajdvzr")
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assertEqual(t, _encStr(t, Base58BitcoinEncoding, "If debugging is the process of removing software bugs, then programming must be the process of putting them in."), "48638SMcJuah5okqPx4kCVf5d8QAdgbdNf28g7ReY13prUENNbMyssjq5GjsrJHF5zeZfqs4uJMUJHr7VbrU4XBUZ2Fw9DVtqtn9N1eXucEWSEZahXV6w4ysGSWqGdpeYTJf1MdDzTg8vfcQViifJjZX")
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}
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func TestBase58BitcoinDecoding(t *testing.T) {
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assertEqual(t, _decStr(t, Base58BitcoinEncoding, "9Ajdvzr"), "Hello")
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assertEqual(t, _decStr(t, Base58BitcoinEncoding, "48638SMcJuah5okqPx4kCVf5d8QAdgbdNf28g7ReY13prUENNbMyssjq5GjsrJHF5zeZfqs4uJMUJHr7VbrU4XBUZ2Fw9DVtqtn9N1eXucEWSEZahXV6w4ysGSWqGdpeYTJf1MdDzTg8vfcQViifJjZX"), "If debugging is the process of removing software bugs, then programming must be the process of putting them in.")
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}
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func TestBase58FlickrEncoding(t *testing.T) {
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assertEqual(t, _encStr(t, Base58FlickrEncoding, "Hello"), "9aJCVZR")
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assertEqual(t, _encStr(t, Base58FlickrEncoding, "If debugging is the process of removing software bugs, then programming must be the process of putting them in."), "48638rmBiUzG5NKQoX4KcuE5C8paCFACnE28F7qDx13PRtennAmYSSJQ5gJSRihf5ZDyEQS4UimtihR7uARt4wbty2fW9duTQTM9n1DwUBevreyzGwu6W4YSgrvQgCPDxsiE1mCdZsF8VEBpuHHEiJyw")
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}
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func TestBase58FlickrDecoding(t *testing.T) {
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assertEqual(t, _decStr(t, Base58FlickrEncoding, "9aJCVZR"), "Hello")
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assertEqual(t, _decStr(t, Base58FlickrEncoding, "48638rmBiUzG5NKQoX4KcuE5C8paCFACnE28F7qDx13PRtennAmYSSJQ5gJSRihf5ZDyEQS4UimtihR7uARt4wbty2fW9duTQTM9n1DwUBevreyzGwu6W4YSgrvQgCPDxsiE1mCdZsF8VEBpuHHEiJyw"), "If debugging is the process of removing software bugs, then programming must be the process of putting them in.")
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}
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func assertEqual(t *testing.T, actual string, expected string) {
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if actual != expected {
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t.Errorf("values differ: Actual: '%v', Expected: '%v'", actual, expected)
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}
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}
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