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package MIME::Decoder::Base64; |
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use strict; |
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use warnings; |
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=head1 NAME |
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MIME::Decoder::Base64 - encode/decode a "base64" stream |
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=head1 SYNOPSIS |
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A generic decoder object; see L for usage. |
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=head1 DESCRIPTION |
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A L subclass for the C<"base64"> encoding. |
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The name was chosen to jibe with the pre-existing MIME::Base64 |
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utility package, which this class actually uses to translate each chunk. |
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=over 4 |
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=item * |
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When B, the input is read one line at a time. |
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The input accumulates in an internal buffer, which is decoded in |
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multiple-of-4-sized chunks (plus a possible "leftover" input chunk, |
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of course). |
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=item * |
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When B, the input is read 45 bytes at a time: this ensures |
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that the output lines are not too long. We chose 45 since it is |
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a multiple of 3 and produces lines under 76 characters, as RFC 2045 |
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specifies: |
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The encoded output stream must be represented in lines of no more |
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than 76 characters each. |
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=back |
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=head1 SEE ALSO |
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L |
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=head1 AUTHOR |
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Eryq (F), ZeeGee Software Inc (F). |
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All rights reserved. This program is free software; you can redistribute |
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it and/or modify it under the same terms as Perl itself. |
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=cut |
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use vars qw(@ISA $VERSION); |
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use MIME::Decoder; |
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use MIME::Base64 2.04; |
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use MIME::Tools qw(debug); |
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@ISA = qw(MIME::Decoder); |
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### The package version, both in 1.23 style *and* usable by MakeMaker: |
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$VERSION = "5.509"; |
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### How many bytes to encode at a time (must be a multiple of 3, and |
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### less than (76 * 0.75)! |
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my $EncodeChunkLength = 45; |
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### How many bytes to decode at a time? |
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my $DecodeChunkLength = 32 * 1024; |
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#------------------------------ |
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# |
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# decode_it IN, OUT |
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# |
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sub decode_it { |
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my ($self, $in, $out) = @_; |
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my $len_4xN; |
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### Create a suitable buffer: |
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my $buffer = ' ' x (120 + $DecodeChunkLength); $buffer = ''; |
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debug "in = $in; out = $out"; |
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### Get chunks until done: |
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local($_) = ' ' x $DecodeChunkLength; |
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while ($in->read($_, $DecodeChunkLength)) { |
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tr{A-Za-z0-9+/}{}cd; ### get rid of non-base64 chars |
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### Concat any new input onto any leftover from the last round: |
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$buffer .= $_; |
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length($buffer) >= $DecodeChunkLength or next; |
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### Extract substring with highest multiple of 4 bytes: |
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### 0 means not enough to work with... get more data! |
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$len_4xN = length($buffer) & ~3; |
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### Partition into largest-multiple-of-4 (which we decode), |
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### and the remainder (which gets handled next time around): |
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$out->print(decode_base64(substr($buffer, 0, $len_4xN))); |
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$buffer = substr($buffer, $len_4xN); |
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} |
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### No more input remains. Dispose of anything left in buffer: |
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if (length($buffer)) { |
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### Pad to 4-byte multiple, and decode: |
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$buffer .= "==="; ### need no more than 3 pad chars |
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$len_4xN = length($buffer) & ~3; |
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### Decode it! |
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$out->print(decode_base64(substr($buffer, 0, $len_4xN))); |
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} |
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1; |
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} |
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#------------------------------ |
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# |
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# encode_it IN, OUT |
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# |
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sub encode_it { |
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my ($self, $in, $out) = @_; |
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my $encoded; |
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my $nread; |
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my $buf = ''; |
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my $nl = $MIME::Entity::BOUNDARY_DELIMITER || "\n"; |
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while ($nread = $in->read($buf, $EncodeChunkLength)) { |
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$encoded = encode_base64($buf, $nl); |
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$encoded .= $nl unless ($encoded =~ /$nl\Z/); ### ensure newline! |
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$out->print($encoded); |
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} |
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1; |
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} |
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#------------------------------ |
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1; |
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