Build with Lua 5.2 without LUA_COMPAT_MODULE flag.

LUASOCKET_USE_GLOBAL flag enable create global variables when load socket/mime modules.

src/mime.lua

@@ -10,13 +10,16 @@
 local base = _G
 local ltn12 = require("ltn12")
 local mime = require("mime.core")
+local io = require("io")
 local string = require("string")
-module("mime")
+local _M = mime
 
 -- encode, decode and wrap algorithm tables
-encodet = {}
-decodet = {}
-wrapt = {}
+local encodet, decodet, wrapt = {},{},{}
+
+_M.encodet = encodet
+_M.decodet = decodet
+_M.wrapt   = wrapt  
 
 -- creates a function that chooses a filter by name from a given table
 local function choose(table)
@@ -33,21 +36,21 @@ end
 
 -- define the encoding filters
 encodet['base64'] = function()
-    return ltn12.filter.cycle(b64, "")
+    return ltn12.filter.cycle(_M.b64, "")
 end
 
 encodet['quoted-printable'] = function(mode)
-    return ltn12.filter.cycle(qp, "",
+    return ltn12.filter.cycle(_M.qp, "",
         (mode == "binary") and "=0D=0A" or "\r\n")
 end
 
 -- define the decoding filters
 decodet['base64'] = function()
-    return ltn12.filter.cycle(unb64, "")
+    return ltn12.filter.cycle(_M.unb64, "")
 end
 
 decodet['quoted-printable'] = function()
-    return ltn12.filter.cycle(unqp, "")
+    return ltn12.filter.cycle(_M.unqp, "")
 end
 
 local function format(chunk)
@@ -60,26 +63,28 @@ end
 -- define the line-wrap filters
 wrapt['text'] = function(length)
     length = length or 76
-    return ltn12.filter.cycle(wrp, length, length)
+    return ltn12.filter.cycle(_M.wrp, length, length)
 end
 wrapt['base64'] = wrapt['text']
 wrapt['default'] = wrapt['text']
 
 wrapt['quoted-printable'] = function()
-    return ltn12.filter.cycle(qpwrp, 76, 76)
+    return ltn12.filter.cycle(_M.qpwrp, 76, 76)
 end
 
 -- function that choose the encoding, decoding or wrap algorithm
-encode = choose(encodet)
-decode = choose(decodet)
-wrap = choose(wrapt)
+_M.encode = choose(encodet)
+_M.decode = choose(decodet)
+_M.wrap = choose(wrapt)
 
 -- define the end-of-line normalization filter
-function normalize(marker)
-    return ltn12.filter.cycle(eol, 0, marker)
+function _M.normalize(marker)
+    return ltn12.filter.cycle(_M.eol, 0, marker)
 end
 
 -- high level stuffing filter
-function stuff()
-    return ltn12.filter.cycle(dot, 2)
+function _M.stuff()
+    return ltn12.filter.cycle(_M.dot, 2)
 end
+
+return _M