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