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-rw-r--r--util/hex.lua26
1 files changed, 26 insertions, 0 deletions
diff --git a/util/hex.lua b/util/hex.lua
new file mode 100644
index 00000000..4cc28d33
--- /dev/null
+++ b/util/hex.lua
@@ -0,0 +1,26 @@
+local s_char = string.char;
+local s_format = string.format;
+local s_gsub = string.gsub;
+local s_lower = string.lower;
+
+local char_to_hex = {};
+local hex_to_char = {};
+
+do
+ local char, hex;
+ for i = 0,255 do
+ char, hex = s_char(i), s_format("%02x", i);
+ char_to_hex[char] = hex;
+ hex_to_char[hex] = char;
+ end
+end
+
+local function to(s)
+ return (s_gsub(s, ".", char_to_hex));
+end
+
+local function from(s)
+ return (s_gsub(s_lower(s), "%X*(%x%x)%X*", hex_to_char));
+end
+
+return { to = to, from = from }