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mime::decoder::base64(3) [suse man page]

MIME::Decoder::Base64(3)				User Contributed Perl Documentation				  MIME::Decoder::Base64(3)

NAME
MIME::Decoder::Base64 - encode/decode a "base64" stream SYNOPSIS
A generic decoder object; see MIME::Decoder for usage. DESCRIPTION
A MIME::Decoder subclass for the "base64" encoding. The name was chosen to jibe with the pre-existing MIME::Base64 utility package, which this class actually uses to translate each chunk. o When decoding, the input is read one line at a time. The input accumulates in an internal buffer, which is decoded in multiple-of-4-sized chunks (plus a possible "leftover" input chunk, of course). o When encoding, the input is read 45 bytes at a time: this ensures that the output lines are not too long. We chose 45 since it is a multiple of 3 and produces lines under 76 characters, as RFC 2045 specifies: The encoded output stream must be represented in lines of no more than 76 characters each. SEE ALSO
MIME::Decoder AUTHOR
Eryq (eryq@zeegee.com), ZeeGee Software Inc (http://www.zeegee.com). All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.1 2008-06-30 MIME::Decoder::Base64(3)

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MIME::Decoder::NBit(3)					User Contributed Perl Documentation				    MIME::Decoder::NBit(3)

NAME
MIME::Decoder::NBit - encode/decode a "7bit" or "8bit" stream SYNOPSIS
A generic decoder object; see MIME::Decoder for usage. DESCRIPTION
This is a MIME::Decoder subclass for the "7bit" and "8bit" content transfer encodings. These are not "encodings" per se: rather, they are simply assertions of the content of the message. From RFC-2045 Section 6.2.: Three transformations are currently defined: identity, the "quoted- printable" encoding, and the "base64" encoding. The domains are "binary", "8bit" and "7bit". The Content-Transfer-Encoding values "7bit", "8bit", and "binary" all mean that the identity (i.e. NO) encoding transformation has been performed. As such, they serve simply as indicators of the domain of the body data, and provide useful information about the sort of encoding that might be needed for transmission in a given transport system. In keeping with this: as of MIME-tools 4.x, this class does no modification of its input when encoding; all it does is attempt to detect violations of the 7bit/8bit assertion, and issue a warning (one per message) if any are found. Legal 7bit data RFC-2045 Section 2.7 defines legal "7bit" data: "7bit data" refers to data that is all represented as relatively short lines with 998 octets or less between CRLF line separation sequences [RFC-821]. No octets with decimal values greater than 127 are allowed and neither are NULs (octets with decimal value 0). CR (decimal value 13) and LF (decimal value 10) octets only occur as part of CRLF line separation sequences. Legal 8bit data RFC-2045 Section 2.8 defines legal "8bit" data: "8bit data" refers to data that is all represented as relatively short lines with 998 octets or less between CRLF line separation sequences [RFC-821]), but octets with decimal values greater than 127 may be used. As with "7bit data" CR and LF octets only occur as part of CRLF line separation sequences and no NULs are allowed. How decoding is done The decoder does a line-by-line pass-through from input to output, leaving the data unchanged except that an end-of-line sequence of CRLF is converted to a newline " ". Given the line-oriented nature of 7bit and 8bit, this seems relatively sensible. How encoding is done The encoder does a line-by-line pass-through from input to output, and simply attempts to detect violations of the "7bit"/"8bit" domain. The default action is to warn once per encoding if violations are detected; the warnings may be silenced with the QUIET configuration of MIME::Tools. SEE ALSO
MIME::Decoder AUTHOR
Eryq (eryq@zeegee.com), ZeeGee Software Inc (http://www.zeegee.com). All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.18.2 2013-11-14 MIME::Decoder::NBit(3)

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