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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta name="description" content="LuaSocket: MIME support">
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<meta name="keywords" content="Lua, LuaSocket, MIME, Library, Support">
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<title>LuaSocket: MIME module</title>
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<link rel="stylesheet" href="reference.css" type="text/css">
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</head>
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<body>
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<center>
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Network support for the Lua language
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home ·
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download ·
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installation ·
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introduction ·
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reference
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</center>
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MIME
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The <tt>mime</tt> namespace offers filters that apply and remove common
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content transfer encodings, such as Base64 and Quoted-Printable.
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It also provides functions to break text into lines and change
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the end-of-line convention.
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MIME is described mainly in
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RFC 2045,
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2046,
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2047,
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2048, and
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2049.
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All functionality provided by the MIME module
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follows the ideas presented in
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LTN012, Filters sources and sinks.
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To obtain the <tt>mime</tt> namespace, run:
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-- loads the MIME module and everything it requires
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local mime = require("mime")
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High-level filters
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mime.normalize([marker])
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Converts most common end-of-line markers to a specific given marker.
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<tt>Marker</tt> is the new marker. It defaults to CRLF, the canonic
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end-of-line marker defined by the MIME standard.
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The function returns a filter that performs the conversion.
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Note: There is no perfect solution to this problem. Different end-of-line
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markers are an evil that will probably plague developers forever.
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This function, however, will work perfectly for text created with any of
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the most common end-of-line markers, i.e. the Mac OS (CR), the Unix (LF),
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or the DOS (CRLF) conventions. Even if the data has mixed end-of-line
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markers, the function will still work well, although it doesn't
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guarantee that the number of empty lines will be correct.
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mime.decode("base64")
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mime.decode("quoted-printable")
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Returns a filter that decodes data from a given transfer content
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encoding.
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mime.encode("base64")
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mime.encode("quoted-printable" [, mode])
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Returns a filter that encodes data according to a given transfer content
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encoding.
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In the Quoted-Printable case, the user can specify whether the data is
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textual or binary, by passing the <tt>mode</tt> strings "<tt>text</tt>" or
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"<tt>binary</tt>". <tt>Mode</tt> defaults to "<tt>text</tt>".
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Although both transfer content encodings specify a limit for the line
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length, the encoding filters do not break text into lines (for
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added flexibility).
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Below is a filter that converts binary data to the Base64 transfer content
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encoding and breaks it into lines of the correct size.
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base64 = ltn12.filter.chain(
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mime.encode("base64"),
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mime.wrap("base64")
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)
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Note: Text data has to be converted to canonic form
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before being encoded.
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base64 = ltn12.filter.chain(
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mime.normalize(),
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mime.encode("base64"),
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mime.wrap("base64")
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)
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mime.stuff()
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Creates and returns a filter that performs stuffing of SMTP messages.
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Note: The <tt>smtp.send</tt> function
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uses this filter automatically. You don't need to chain it with your
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source, or apply it to your message body.
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mime.wrap("text" [, length])
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mime.wrap("base64")
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mime.wrap("quoted-printable")
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Returns a filter that breaks data into lines.
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The "<tt>text</tt>" line-wrap filter simply breaks text into lines by
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inserting CRLF end-of-line markers at appropriate positions.
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<tt>Length</tt> defaults 76.
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The "<tt>base64</tt>" line-wrap filter works just like the default
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"<tt>text</tt>" line-wrap filter with default length.
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The function can also wrap "<tt>quoted-printable</tt>" lines, taking care
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not to break lines in the middle of an escaped character. In that case, the
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line length is fixed at 76.
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For example, to create an encoding filter for the Quoted-Printable transfer content encoding of text data, do the following:
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qp = ltn12.filter.chain(
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mime.normalize(),
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mime.encode("quoted-printable"),
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mime.wrap("quoted-printable")
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)
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Note: To break into lines with a different end-of-line convention, apply
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a normalization filter after the line break filter.
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Low-level filters
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A, B = mime.b64(C [, D])
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Low-level filter to perform Base64 encoding.
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<tt>A</tt> is the encoded version of the largest prefix of
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<tt>C..D</tt>
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that can be encoded unambiguously. <tt>B</tt> has the remaining bytes of
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<tt>C..D</tt>, before encoding.
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If <tt>D</tt> is <tt>nil</tt>, <tt>A</tt> is padded with
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the encoding of the remaining bytes of <tt>C</tt>.
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Note: The simplest use of this function is to encode a string into it's
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Base64 transfer content encoding. Notice the extra parenthesis around the
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call to <tt>mime.b64</tt>, to discard the second return value.
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print((mime.b64("diego:password")))
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--> ZGllZ286cGFzc3dvcmQ=
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A, n = mime.dot(m [, B])
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Low-level filter to perform SMTP stuffing and enable transmission of
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messages containing the sequence "CRLF.CRLF".
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<tt>A</tt> is the stuffed version of <tt>B</tt>. '<tt>n</tt>' gives the
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number of characters from the sequence CRLF seen in the end of <tt>B</tt>.
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'<tt>m</tt>' should tell the same, but for the previous chunk.
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Note: The message body is defined to begin with
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an implicit CRLF. Therefore, to stuff a message correctly, the
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first <tt>m</tt> should have the value 2.
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print((string.gsub(mime.dot(2, ".\r\nStuffing the message.\r\n.\r\n."), "\r\n", "\\n")))
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--> ..\nStuffing the message.\n..\n..
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Note: The <tt>smtp.send</tt> function
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uses this filter automatically. You don't need to
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apply it again.
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A, B = mime.eol(C [, D, marker])
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Low-level filter to perform end-of-line marker translation.
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For each chunk, the function needs to know if the last character of the
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previous chunk could be part of an end-of-line marker or not. This is the
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context the function receives besides the chunk. An updated version of
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the context is returned after each new chunk.
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<tt>A</tt> is the translated version of <tt>D</tt>. <tt>C</tt> is the
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ASCII value of the last character of the previous chunk, if it was a
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candidate for line break, or 0 otherwise.
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<tt>B</tt> is the same as <tt>C</tt>, but for the current
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chunk. <tt>Marker</tt> gives the new end-of-line marker and defaults to CRLF.
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-- translates the end-of-line marker to UNIX
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unix = mime.eol(0, dos, "\n")
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A, B = mime.qp(C [, D, marker])
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Low-level filter to perform Quoted-Printable encoding.
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<tt>A</tt> is the encoded version of the largest prefix of
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<tt>C..D</tt>
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that can be encoded unambiguously. <tt>B</tt> has the remaining bytes of
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<tt>C..D</tt>, before encoding.
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If <tt>D</tt> is <tt>nil</tt>, <tt>A</tt> is padded with
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b53373 |
the encoding of the remaining bytes of <tt>C</tt>.
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Throughout encoding, occurrences of CRLF are replaced by the
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<tt>marker</tt>, which itself defaults to CRLF.
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b53373 |
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b53373 |
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b53373 |
Note: The simplest use of this function is to encode a string into it's
|
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b53373 |
Quoted-Printable transfer content encoding.
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b53373 |
Notice the extra parenthesis around the call to <tt>mime.qp</tt>, to discard the second return value.
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b53373 |
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print((mime.qp("maçã")))
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--> ma=E7=E3=
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A, m = mime.qpwrp(n [, B, length])
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b53373 |
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b53373 |
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b53373 |
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b53373 |
Low-level filter to break Quoted-Printable text into lines.
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b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
<tt>A</tt> is a copy of <tt>B</tt>, broken into lines of at most
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Packit |
b53373 |
<tt>length</tt> bytes (defaults to 76).
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Packit |
b53373 |
'<tt>n</tt>' should tell how many bytes are left for the first
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Packit |
b53373 |
line of <tt>B</tt> and '<tt>m</tt>' returns the number of bytes
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Packit |
b53373 |
left in the last line of <tt>A</tt>.
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
Note: Besides breaking text into lines, this function makes sure the line
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Packit |
b53373 |
breaks don't fall in the middle of an escaped character combination. Also,
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Packit |
b53373 |
this function only breaks lines that are bigger than <tt>length</tt> bytes.
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
A, B = mime.unb64(C [, D])
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
Low-level filter to perform Base64 decoding.
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
<tt>A</tt> is the decoded version of the largest prefix of
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Packit |
b53373 |
<tt>C..D</tt>
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Packit |
b53373 |
that can be decoded unambiguously. <tt>B</tt> has the remaining bytes of
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Packit |
b53373 |
<tt>C..D</tt>, before decoding.
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Packit |
b53373 |
If <tt>D</tt> is <tt>nil</tt>, <tt>A</tt> is the empty string
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Packit |
b53373 |
and <tt>B</tt> returns whatever couldn't be decoded.
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
Note: The simplest use of this function is to decode a string from it's
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Packit |
b53373 |
Base64 transfer content encoding.
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Packit |
b53373 |
Notice the extra parenthesis around the call to <tt>mime.unqp</tt>, to discard the second return value.
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
print((mime.unb64("ZGllZ286cGFzc3dvcmQ=")))
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Packit |
b53373 |
--> diego:password
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
A, B = mime.unqp(C [, D])
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
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Packit |
b53373 |
Low-level filter to remove the Quoted-Printable transfer content encoding
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|
Packit |
b53373 |
from data.
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|
Packit |
b53373 |
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|
Packit |
b53373 |
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|
Packit |
b53373 |
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|
Packit |
b53373 |
<tt>A</tt> is the decoded version of the largest prefix of
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|
Packit |
b53373 |
<tt>C..D</tt>
|
|
Packit |
b53373 |
that can be decoded unambiguously. <tt>B</tt> has the remaining bytes of
|
|
Packit |
b53373 |
<tt>C..D</tt>, before decoding.
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|
Packit |
b53373 |
If <tt>D</tt> is <tt>nil</tt>, <tt>A</tt> is augmented with
|
|
Packit |
b53373 |
the encoding of the remaining bytes of <tt>C</tt>.
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|
Packit |
b53373 |
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|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
Note: The simplest use of this function is to decode a string from it's
|
|
Packit |
b53373 |
Quoted-Printable transfer content encoding.
|
|
Packit |
b53373 |
Notice the extra parenthesis around the call to <tt>mime.unqp</tt>, to discard the second return value.
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
print((mime.qp("ma=E7=E3=")))
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|
Packit |
b53373 |
--> maçã
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
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|
Packit |
b53373 |
|
|
Packit |
b53373 |
A, m = mime.wrp(n [, B, length])
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|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
Low-level filter to break text into lines with CRLF marker.
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|
Packit |
b53373 |
Text is assumed to be in the <tt>normalize</tt> form.
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
<tt>A</tt> is a copy of <tt>B</tt>, broken into lines of at most
|
|
Packit |
b53373 |
<tt>length</tt> bytes (defaults to 76).
|
|
Packit |
b53373 |
'<tt>n</tt>' should tell how many bytes are left for the first
|
|
Packit |
b53373 |
line of <tt>B</tt> and '<tt>m</tt>' returns the number of bytes
|
|
Packit |
b53373 |
left in the last line of <tt>A</tt>.
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
Note: This function only breaks lines that are bigger than
|
|
Packit |
b53373 |
<tt>length</tt> bytes. The resulting line length does not include the CRLF
|
|
Packit |
b53373 |
marker.
|
|
Packit |
b53373 |
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|
Packit |
b53373 |
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|
Packit |
b53373 |
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|
Packit |
b53373 |
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Packit |
b53373 |
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|
Packit |
b53373 |
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|
Packit |
b53373 |
|
|
Packit |
b53373 |
<center>
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
home ·
|
|
Packit |
b53373 |
download ·
|
|
Packit |
b53373 |
installation ·
|
|
Packit |
b53373 |
introduction ·
|
|
Packit |
b53373 |
reference
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
<small>
|
|
Packit |
b53373 |
Last modified by Diego Nehab on
|
|
Packit |
b53373 |
Thu Apr 20 00:25:44 EDT 2006
|
|
Packit |
b53373 |
</small>
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
</center>
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
|
|
Packit |
b53373 |
</body>
|
|
Packit |
b53373 |
</html>
|