William Casarin
cebd1f48ca
This is a refactor of the codebase to use a more memory-efficient representation of notes. It should also be much faster at decoding since we're using a custom C json parser now. Changelog-Changed: Improved memory usage and performance when processing events
77 lines
1.4 KiB
Swift
77 lines
1.4 KiB
Swift
//
|
|
// ProofOfWork.swift
|
|
// damus
|
|
//
|
|
// Created by William Casarin on 2022-04-11.
|
|
//
|
|
|
|
import Foundation
|
|
|
|
func char_to_hex(_ c: UInt8) -> UInt8?
|
|
{
|
|
// 0 && 9
|
|
if (c >= 48 && c <= 57) {
|
|
return c - 48 // 0
|
|
}
|
|
// a && f
|
|
if (c >= 97 && c <= 102) {
|
|
return c - 97 + 10;
|
|
}
|
|
// A && F
|
|
if (c >= 65 && c <= 70) {
|
|
return c - 65 + 10;
|
|
}
|
|
return nil;
|
|
}
|
|
|
|
@discardableResult
|
|
func hex_decode(_ str: String) -> [UInt8]?
|
|
{
|
|
if str.count == 0 {
|
|
return nil
|
|
}
|
|
var ret: [UInt8] = []
|
|
let chars = Array(str.utf8)
|
|
var i: Int = 0
|
|
for c in zip(chars, chars[1...]) {
|
|
i += 1
|
|
|
|
if i % 2 == 0 {
|
|
continue
|
|
}
|
|
|
|
guard let c1 = char_to_hex(c.0) else {
|
|
return nil
|
|
}
|
|
|
|
guard let c2 = char_to_hex(c.1) else {
|
|
return nil
|
|
}
|
|
|
|
ret.append((c1 << 4) | c2)
|
|
}
|
|
|
|
return ret
|
|
}
|
|
|
|
|
|
func hex_decode_id(_ str: String) -> Data? {
|
|
guard str.utf8.count == 64, let decoded = hex_decode(str) else {
|
|
return nil
|
|
}
|
|
|
|
return Data(decoded)
|
|
}
|
|
|
|
func hex_decode_noteid(_ str: String) -> NoteId? {
|
|
return hex_decode_id(str).map(NoteId.init)
|
|
}
|
|
|
|
func hex_decode_pubkey(_ str: String) -> Pubkey? {
|
|
return hex_decode_id(str).map(Pubkey.init)
|
|
}
|
|
|
|
func hex_decode_privkey(_ str: String) -> Privkey? {
|
|
return hex_decode_id(str).map(Privkey.init)
|
|
}
|