From f5c4671bfbad96bf346bd7e9a21fc4317b4959df Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Sat, 3 Dec 2022 17:00:20 +0530
Subject: Adds most of the tools

---
 v_windows/v/vlib/encoding/base58/alphabet.v | 65 +++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 v_windows/v/vlib/encoding/base58/alphabet.v

(limited to 'v_windows/v/vlib/encoding/base58/alphabet.v')

diff --git a/v_windows/v/vlib/encoding/base58/alphabet.v b/v_windows/v/vlib/encoding/base58/alphabet.v
new file mode 100644
index 0000000..44d4fc3
--- /dev/null
+++ b/v_windows/v/vlib/encoding/base58/alphabet.v
@@ -0,0 +1,65 @@
+module base58
+
+// alphabets is a map of common base58 alphabets
+pub const alphabets = init_alphabets()
+
+// init_alphabet instantiates the preconfigured `Alphabet`s and returns them as `map[string]Alphabet`.
+// This is a temporary function. Setting const alphabets to the value returned in this function
+// causes a C error right now.
+fn init_alphabets() map[string]Alphabet {
+	return {
+		'btc':    new_alphabet('123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz') or {
+			panic(@MOD + '.' + @FN + ': this should never happen')
+		}
+		'flickr': new_alphabet('123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ') or {
+			panic(@MOD + '.' + @FN + ': this should never happen')
+		}
+		'ripple': new_alphabet('rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz') or {
+			panic(@MOD + '.' + @FN + ': this should never happen')
+		}
+	}
+}
+
+// Alphabet is the series of characters that an input
+// will be encoded to and a decode table.
+struct Alphabet {
+mut:
+	decode []i8   = []i8{len: 128, init: -1}
+	encode []byte = []byte{len: 58}
+}
+
+// str returns an Alphabet encode table byte array as a string
+pub fn (alphabet Alphabet) str() string {
+	// i guess i had a brain fart here. Why would I actually use this code?!
+	// mut str := []byte{}
+	// for entry in alphabet.encode {
+	// 	str << entry
+	// }
+	// return str.bytestr()
+	return alphabet.encode.bytestr()
+}
+
+// new_alphabet instantiates an Alphabet object based on
+// the provided characters
+pub fn new_alphabet(str string) ?Alphabet {
+	if str.len != 58 {
+		return error(@MOD + '.' + @FN + ': string must be 58 characters in length')
+	}
+
+	mut ret := Alphabet{}
+	copy(ret.encode, str.bytes())
+
+	mut distinct := 0
+	for i, b in ret.encode {
+		if ret.decode[b] == -1 {
+			distinct++
+		}
+		ret.decode[b] = i8(i)
+	}
+
+	if distinct != 58 {
+		return error(@MOD + '.' + @FN + ': string must not contain repeating characters')
+	}
+
+	return ret
+}
-- 
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