prosody
442019e955dc
util/hex.lua

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util/hex.lua @ 6802:442019e955dc

util.hex: Normalize hex to lowercase and discard non-hex input
author Kim Alvefur <zash@zash.se>
date Wed, 26 Aug 2015 14:32:20 +0200
parent 6545:ec566d7cd518
child 12355:a0ff5c438e9d
comparison
equal deleted inserted replaced
6798:8b4c8e957211 6802:442019e955dc
1 local s_char = string.char; 1 local s_char = string.char;
2 local s_format = string.format; 2 local s_format = string.format;
3 local s_gsub = string.gsub; 3 local s_gsub = string.gsub;
4 local s_lower = string.lower;
4 5
5 local char_to_hex = {}; 6 local char_to_hex = {};
6 local hex_to_char = {}; 7 local hex_to_char = {};
7 8
8 do 9 do
17 local function to(s) 18 local function to(s)
18 return (s_gsub(s, ".", char_to_hex)); 19 return (s_gsub(s, ".", char_to_hex));
19 end 20 end
20 21
21 local function from(s) 22 local function from(s)
22 return (s_gsub(s, "..", hex_to_char)); 23 return (s_gsub(s_lower(s), "%X*(%x%x)%X*", hex_to_char));
23 end 24 end
24 25
25 return { to = to, from = from } 26 return { to = to, from = from }