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package MIME::Decoder::NBit; use strict; use warnings; =head1 NAME MIME::Decoder::NBit - encode/decode a "7bit" or "8bit" stream =head1 SYNOPSIS A generic decoder object; see L<MIME::Decoder> for usage. =head1 DESCRIPTION This is a MIME::Decoder subclass for the C<7bit> and C<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, I<this class does no modification of its input when encoding;> all it does is attempt to I<detect violations> of the 7bit/8bit assertion, and issue a warning (one per message) if any are found. =head2 Legal 7bit data RFC-2045 Section 2.7 defines legal C<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. =head2 Legal 8bit data RFC-2045 Section 2.8 defines legal C<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. =head2 How decoding is done The B<decoder> does a line-by-line pass-through from input to output, leaving the data unchanged I<except> that an end-of-line sequence of CRLF is converted to a newline "\n". Given the line-oriented nature of 7bit and 8bit, this seems relatively sensible. =head2 How encoding is done The B<encoder> does a line-by-line pass-through from input to output, and simply attempts to I<detect> violations of the C<7bit>/C<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 L<MIME::Tools>. =head1 SEE ALSO L<MIME::Decoder> =head1 AUTHOR Eryq (F<eryq@zeegee.com>), ZeeGee Software Inc (F<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. =cut use vars qw(@ISA $VERSION); use MIME::Decoder; use MIME::Tools qw(:msgs); @ISA = qw(MIME::Decoder); ### The package version, both in 1.23 style *and* usable by MakeMaker: $VERSION = "5.510"; ### How many bytes to decode at a time? my $DecodeChunkLength = 8 * 1024; #------------------------------ # # decode_it IN, OUT # sub decode_it { my ($self, $in, $out) = @_; my $and_also; ### Allocate a buffer suitable for a chunk and a line: local $_ = (' ' x ($DecodeChunkLength + 1024)); $_ = ''; ### Get chunks until done: while ($in->read($_, $DecodeChunkLength)) { $and_also = $in->getline; $_ .= $and_also if defined($and_also); ### Just got a chunk ending in a line. s/\015\012$/\n/g; $out->print($_); } 1; } #------------------------------ # # encode_it IN, OUT # sub encode_it { my ($self, $in, $out) = @_; my $saw_8bit = 0; ### warn them ONCE PER ENCODING if 8-bit data exists my $saw_long = 0; ### warn them ONCE PER ENCODING if long lines exist my $seven_bit = ($self->encoding eq '7bit'); ### 7bit? my $line; while (defined($line = $in->getline)) { ### Whine if encoding is 7bit and it has 8-bit data: if ($seven_bit && ($line =~ /[\200-\377]/)) { ### oops! saw 8-bit data! whine "saw 8-bit data while encoding 7bit" unless $saw_8bit++; } ### Whine if long lines detected: if (length($line) > 998) { whine "saw long line while encoding 7bit/8bit" unless $saw_long++; } ### Output! $out->print($line); } 1; } 1;