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package base58
// Alphabet is a a b58 alphabet.
type Alphabet struct {
decode [128]int8
encode [58]byte
}
// NewAlphabet creates a new alphabet from the passed string.
//
// It panics if the passed string is not 58 bytes long or isn't valid ASCII.
func NewAlphabet(s string) *Alphabet {
if len(s) != 58 {
panic("base58 alphabets must be 58 bytes long")
}
ret := new(Alphabet)
copy(ret.encode[:], s)
for i := range ret.decode {
ret.decode[i] = -1
}
for i, b := range ret.encode {
ret.decode[b] = int8(i)
}
return ret
}
// BTCAlphabet is the bitcoin base58 alphabet.
var BTCAlphabet = NewAlphabet("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")
// FlickrAlphabet is the flickr base58 alphabet.
var FlickrAlphabet = NewAlphabet("123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ")
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