mime::quotedprint(3perl) [debian man page]
MIME::QuotedPrint(3perl) Perl Programmers Reference Guide MIME::QuotedPrint(3perl) NAME
MIME::QuotedPrint - Encoding and decoding of quoted-printable strings SYNOPSIS
use MIME::QuotedPrint; $encoded = encode_qp($decoded); $decoded = decode_qp($encoded); DESCRIPTION
This module provides functions to encode and decode strings into and from the quoted-printable encoding specified in RFC 2045 - MIME (Multipurpose Internet Mail Extensions). The quoted-printable encoding is intended to represent data that largely consists of bytes that correspond to printable characters in the ASCII character set. Each non-printable character (as defined by English Americans) is represented by a triplet consisting of the character "=" followed by two hexadecimal digits. The following functions are provided: encode_qp( $str) encode_qp( $str, $eol) encode_qp( $str, $eol, $binmode ) This function returns an encoded version of the string ($str) given as argument. The second argument ($eol) is the line-ending sequence to use. It is optional and defaults to " ". Every occurrence of " " is replaced with this string, and it is also used for additional "soft line breaks" to ensure that no line end up longer than 76 characters. Pass it as " 15 12" to produce data suitable for external consumption. The string " " produces the same result on many platforms, but not all. The third argument ($binmode) will select binary mode if passed as a TRUE value. In binary mode " " will be encoded in the same way as any other non-printable character. This ensures that a decoder will end up with exactly the same string whatever line ending sequence it uses. In general it is preferable to use the base64 encoding for binary data; see MIME::Base64. An $eol of "" (the empty string) is special. In this case, no "soft line breaks" are introduced and binary mode is effectively enabled so that any " " in the original data is encoded as well. decode_qp( $str ) This function returns the plain text version of the string given as argument. The lines of the result are " " terminated, even if the $str argument contains " " terminated lines. If you prefer not to import these routines into your namespace, you can call them as: use MIME::QuotedPrint (); $encoded = MIME::QuotedPrint::encode($decoded); $decoded = MIME::QuotedPrint::decode($encoded); Perl v5.8 and better allow extended Unicode characters in strings. Such strings cannot be encoded directly, as the quoted-printable encoding is only defined for single-byte characters. The solution is to use the Encode module to select the byte encoding you want. For example: use MIME::QuotedPrint qw(encode_qp); use Encode qw(encode); $encoded = encode_qp(encode("UTF-8", "x{FFFF} ")); print $encoded; COPYRIGHT
Copyright 1995-1997,2002-2004 Gisle Aas. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
MIME::Base64 perl v5.14.2 2011-09-19 MIME::QuotedPrint(3perl)
Check Out this Related Man Page
MIME::Base64(3pm) Perl Programmers Reference Guide MIME::Base64(3pm) NAME
MIME::Base64 - Encoding and decoding of base64 strings SYNOPSIS
use MIME::Base64; $encoded = encode_base64('Aladdin:open sesame'); $decoded = decode_base64($encoded); DESCRIPTION
This module provides functions to encode and decode strings into and from the base64 encoding specified in RFC 2045 - MIME (Multipurpose Internet Mail Extensions). The base64 encoding is designed to represent arbitrary sequences of octets in a form that need not be humanly readable. A 65-character subset ([A-Za-z0-9+/=]) of US-ASCII is used, enabling 6 bits to be represented per printable character. The following primary functions are provided: encode_base64( $bytes ) encode_base64( $bytes, $eol ); Encode data by calling the encode_base64() function. The first argument is the byte string to encode. The second argument is the line-ending sequence to use. It is optional and defaults to " ". The returned encoded string is broken into lines of no more than 76 characters each and it will end with $eol unless it is empty. Pass an empty string as second argument if you do not want the encoded string to be broken into lines. The function will croak with "Wide character in subroutine entry" if $bytes contains characters with code above 255. The base64 encoding is only defined for single-byte characters. Use the Encode module to select the byte encoding you want. decode_base64( $str ) Decode a base64 string by calling the decode_base64() function. This function takes a single argument which is the string to decode and returns the decoded data. Any character not part of the 65-character base64 subset is silently ignored. Characters occurring after a '=' padding character are never decoded. If you prefer not to import these routines into your namespace, you can call them as: use MIME::Base64 (); $encoded = MIME::Base64::encode($decoded); $decoded = MIME::Base64::decode($encoded); Additional functions not exported by default: encode_base64url( $bytes ) decode_base64url( $str ) Encode and decode according to the base64 scheme for "URL applications" [1]. This is a variant of the base64 encoding which does not use padding, does not break the string into multiple lines and use the characters "-" and "_" instead of "+" and "/" to avoid using reserved URL characters. encoded_base64_length( $bytes ) encoded_base64_length( $bytes, $eol ) Returns the length that the encoded string would have without actually encoding it. This will return the same value as "length(encode_base64($bytes))", but should be more efficient. decoded_base64_length( $str ) Returns the length that the decoded string would have without actually decoding it. This will return the same value as "length(decode_base64($str))", but should be more efficient. EXAMPLES
If you want to encode a large file, you should encode it in chunks that are a multiple of 57 bytes. This ensures that the base64 lines line up and that you do not end up with padding in the middle. 57 bytes of data fills one complete base64 line (76 == 57*4/3): use MIME::Base64 qw(encode_base64); open(FILE, "/var/log/wtmp") or die "$!"; while (read(FILE, $buf, 60*57)) { print encode_base64($buf); } or if you know you have enough memory use MIME::Base64 qw(encode_base64); local($/) = undef; # slurp print encode_base64(<STDIN>); The same approach as a command line: perl -MMIME::Base64 -0777 -ne 'print encode_base64($_)' <file Decoding does not need slurp mode if every line contains a multiple of four base64 chars: perl -MMIME::Base64 -ne 'print decode_base64($_)' <file Perl v5.8 and better allow extended Unicode characters in strings. Such strings cannot be encoded directly, as the base64 encoding is only defined for single-byte characters. The solution is to use the Encode module to select the byte encoding you want. For example: use MIME::Base64 qw(encode_base64); use Encode qw(encode); $encoded = encode_base64(encode("UTF-8", "x{FFFF} ")); print $encoded; COPYRIGHT
Copyright 1995-1999, 2001-2004, 2010 Gisle Aas. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Distantly based on LWP::Base64 written by Martijn Koster <m.koster@nexor.co.uk> and Joerg Reichelt <j.reichelt@nexor.co.uk> and code posted to comp.lang.perl <3pd2lp$6gf@wsinti07.win.tue.nl> by Hans Mulder <hansm@wsinti07.win.tue.nl> The XS implementation uses code from metamail. Copyright 1991 Bell Communications Research, Inc. (Bellcore) SEE ALSO
MIME::QuotedPrint [1] <http://en.wikipedia.org/wiki/Base64#URL_applications> perl v5.18.2 2014-01-06 MIME::Base64(3pm)