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annotate src/mime.lua @ 4:f0a27ccb1193 tip

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Added ignore file
author Eric Wing <ewing . public |-at-| gmail . com>
date Sat, 30 Aug 2008 08:46:39 -0700
parents 4b915342e2a8
children
rev   line source
0
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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1 -----------------------------------------------------------------------------
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2 -- MIME support for the Lua language.
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3 -- Author: Diego Nehab
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4 -- Conforming to RFCs 2045-2049
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5 -- RCS ID: $Id: mime.lua,v 1.29 2007/06/11 23:44:54 diego Exp $
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6 -----------------------------------------------------------------------------
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7
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8 -----------------------------------------------------------------------------
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9 -- Declare module and import dependencies
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10 -----------------------------------------------------------------------------
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11 local base = _G
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12 local ltn12 = require("ltn12")
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13 local mime = require("mime.core")
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14 local io = require("io")
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15 local string = require("string")
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16 module("mime")
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17
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18 -- encode, decode and wrap algorithm tables
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19 encodet = {}
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20 decodet = {}
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21 wrapt = {}
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22
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23 -- creates a function that chooses a filter by name from a given table
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24 local function choose(table)
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25 return function(name, opt1, opt2)
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26 if base.type(name) ~= "string" then
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27 name, opt1, opt2 = "default", name, opt1
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28 end
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29 local f = table[name or "nil"]
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30 if not f then
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31 base.error("unknown key (" .. base.tostring(name) .. ")", 3)
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32 else return f(opt1, opt2) end
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33 end
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34 end
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35
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36 -- define the encoding filters
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37 encodet['base64'] = function()
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38 return ltn12.filter.cycle(b64, "")
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39 end
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40
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41 encodet['quoted-printable'] = function(mode)
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42 return ltn12.filter.cycle(qp, "",
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43 (mode == "binary") and "=0D=0A" or "\r\n")
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44 end
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45
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46 -- define the decoding filters
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47 decodet['base64'] = function()
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48 return ltn12.filter.cycle(unb64, "")
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49 end
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50
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51 decodet['quoted-printable'] = function()
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52 return ltn12.filter.cycle(unqp, "")
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53 end
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54
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55 local function format(chunk)
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56 if chunk then
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57 if chunk == "" then return "''"
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58 else return string.len(chunk) end
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59 else return "nil" end
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60 end
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61
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62 -- define the line-wrap filters
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63 wrapt['text'] = function(length)
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64 length = length or 76
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65 return ltn12.filter.cycle(wrp, length, length)
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66 end
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67 wrapt['base64'] = wrapt['text']
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68 wrapt['default'] = wrapt['text']
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69
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70 wrapt['quoted-printable'] = function()
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71 return ltn12.filter.cycle(qpwrp, 76, 76)
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72 end
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73
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74 -- function that choose the encoding, decoding or wrap algorithm
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75 encode = choose(encodet)
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76 decode = choose(decodet)
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77 wrap = choose(wrapt)
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78
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79 -- define the end-of-line normalization filter
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80 function normalize(marker)
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81 return ltn12.filter.cycle(eol, 0, marker)
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82 end
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83
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84 -- high level stuffing filter
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85 function stuff()
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86 return ltn12.filter.cycle(dot, 2)
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87 end