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

MIME::Decoder::Base64 - encode/decode a "base64" stream

A generic decoder object; see MIME::Decoder for usage.

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.

  • 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).
  • 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.


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.

2023-07-25 perl v5.38.0