62 lines
2.4 KiB
TeX
62 lines
2.4 KiB
TeX
\section{\module{base64} ---
|
|
Encode and decode MIME base64 data}
|
|
|
|
\declaremodule{standard}{base64}
|
|
\modulesynopsis{Encode and decode files using the MIME base64 data.}
|
|
|
|
|
|
\indexii{base64}{encoding}
|
|
\index{MIME!base64 encoding}
|
|
|
|
This module performs base64 encoding and decoding of arbitrary binary
|
|
strings into text strings that can be safely sent by email or included
|
|
as part of an HTTP POST request. The
|
|
encoding scheme is defined in \rfc{1521} (\emph{MIME
|
|
(Multipurpose Internet Mail Extensions) Part One: Mechanisms for
|
|
Specifying and Describing the Format of Internet Message Bodies},
|
|
section 5.2, ``Base64 Content-Transfer-Encoding'') and is used for
|
|
MIME email and various other Internet-related applications; it is not
|
|
the same as the output produced by the \program{uuencode} program.
|
|
For example, the string \code{'www.python.org'} is encoded as the
|
|
string \code{'d3d3LnB5dGhvbi5vcmc=\e n'}.
|
|
|
|
|
|
\begin{funcdesc}{decode}{input, output}
|
|
Decode the contents of the \var{input} file and write the resulting
|
|
binary data to the \var{output} file.
|
|
\var{input} and \var{output} must either be file objects or objects that
|
|
mimic the file object interface. \var{input} will be read until
|
|
\code{\var{input}.read()} returns an empty string.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{decodestring}{s}
|
|
Decode the string \var{s}, which must contain one or more lines of
|
|
base64 encoded data, and return a string containing the resulting
|
|
binary data.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{encode}{input, output}
|
|
Encode the contents of the \var{input} file and write the resulting
|
|
base64 encoded data to the \var{output} file.
|
|
\var{input} and \var{output} must either be file objects or objects that
|
|
mimic the file object interface. \var{input} will be read until
|
|
\code{\var{input}.read()} returns an empty string.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{encodestring}{s}
|
|
Encode the string \var{s}, which can contain arbitrary binary data,
|
|
and return a string containing one or more lines of
|
|
base64 encoded data.
|
|
\end{funcdesc}
|
|
|
|
|
|
\begin{seealso}
|
|
\seemodule{binascii}{Support module containing \ASCII{}-to-binary
|
|
and binary-to-\ASCII{} conversions.}
|
|
\seerfc{1521}{MIME (Multipurpose Internet Mail Extensions) Part One:
|
|
Mechanisms for Specifying and Describing the Format of
|
|
Internet Message Bodies}{Section 5.2, ``Base64
|
|
Content-Transfer-Encoding,'' provides the definition of the
|
|
base64 encoding.}
|
|
\end{seealso}
|