66 lines
1.9 KiB
V
66 lines
1.9 KiB
V
module base58
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// alphabets is a map of common base58 alphabets
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pub const alphabets = init_alphabets()
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// init_alphabet instantiates the preconfigured `Alphabet`s and returns them as `map[string]Alphabet`.
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// This is a temporary function. Setting const alphabets to the value returned in this function
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// causes a C error right now.
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fn init_alphabets() map[string]Alphabet {
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return {
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'btc': new_alphabet('123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz') or {
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panic(@MOD + '.' + @FN + ': this should never happen')
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}
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'flickr': new_alphabet('123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ') or {
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panic(@MOD + '.' + @FN + ': this should never happen')
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}
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'ripple': new_alphabet('rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz') or {
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panic(@MOD + '.' + @FN + ': this should never happen')
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}
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}
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}
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// Alphabet is the series of characters that an input
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// will be encoded to and a decode table.
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struct Alphabet {
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mut:
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decode []i8 = []i8{len: 128, init: -1}
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encode []u8 = []u8{len: 58}
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}
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// str returns an Alphabet encode table byte array as a string
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pub fn (alphabet Alphabet) str() string {
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// i guess i had a brain fart here. Why would I actually use this code?!
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// mut str := []u8{}
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// for entry in alphabet.encode {
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// str << entry
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// }
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// return str.bytestr()
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return alphabet.encode.bytestr()
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}
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// new_alphabet instantiates an Alphabet object based on
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// the provided characters
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pub fn new_alphabet(str string) ?Alphabet {
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if str.len != 58 {
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return error(@MOD + '.' + @FN + ': string must be 58 characters in length')
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}
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mut ret := Alphabet{}
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copy(mut ret.encode, str.bytes())
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mut distinct := 0
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for i, b in ret.encode {
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if ret.decode[b] == -1 {
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distinct++
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}
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ret.decode[b] = i8(i)
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}
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if distinct != 58 {
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return error(@MOD + '.' + @FN + ': string must not contain repeating characters')
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}
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return ret
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}
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