NAME
    Bit::MorseSignals - The MorseSignals protocol.

VERSION
    Version 0.01

DESCRIPTION
    In unidirectionnal communication channels (such as networking or IPC),
    the main issue is often to know the length of the message. Some possible
    solutions are fixed-length messages (which is quite cumbersome) or a
    special ending sequence (but it no longer can appear in the data). This
    module proposes another solution, by using a begin/end signature
    specialized for each message.

    An actual implementation is also provided :

    Bit::MorseSignals::Emitter is a base class for emitters ;
    Bit::MorseSignals::Receiver is a base class for receivers ;

    Go to those pages if you just want the stuff done and don't care about
    how it gets there.

PROTOCOL
    Each byte of the data string is converted into its bits sequence, with
    bits of lowest weight coming first. All those bits sequences are put
    into the same order as the characters occur in the string.

    The header is composed of three bits (lowest weight coming first) :

    - The 2 first ones denotes the data type : a value of 0 is used for a
    plain string, 1 for an UTF-8 encoded string, and 2 for a Storable
    object. See also the "CONSTANTS" sections ;
    - The third one is reserved. For compatibility reasons, the receiver
    should for now enforce the message data type to plain when this bit is
    lit.

    The emitter computes then the longuest sequence of successives 0 (say,
    m) and 1 (n) in the concatenation of the header and the data. A
    signature is then chosen :

    - If m > n, we take n+1 times 1 followed by one 0 ;
    - Otherwise, we take m+1 times 0 followed by one 1.

    The signal is then formed by concatenating the signature, the header,
    the data bits and the reversed signature (i.e. the bits of the signature
    in the reverse order).

        a ... a b | t0 t1 r | ... data ... | b a ... a
        signature | header  |     data     | reversed signature

    The receiver knows that the signature has been sent when it has catched
    at least one 0 and one 1. The signal is completely transferred when it
    has received for the first time the whole reversed signature.

CONSTANTS
  "BM_DATA_AUTO"
    Default for non-references messages. Try to guess if the given scalar is
    an UTF-8 string with "Encode::is_utf8".

  "BM_DATA_PLAIN"
    Treats the data as a plain string. No extra mangling in done.

  "BM_DATA_UTF8"
    Treats the data as an UTF-8 string. The string is
    "Encode::encode_utf8"'d in a binary string before sending, and
    "Encode::decode_utf8"'d by the receiver.

  "BM_DATA_STORABLE"
    The scalar, array or hash reference given is "Storable::freeze"'d by the
    sender and "Storable::thaw"'d by the receiver.

EXPORT
    The constants "BM_DATA_AUTO", "BM_DATA_PLAIN", "BM_DATA_UTF8" and
    "BM_DATA_STORABLE" are only exported on request, either by specifying
    their names or the ':consts' tag.

DEPENDENCIES
    Carp (standard since perl 5), Encode (since perl 5.007003), Storable
    (idem).

SEE ALSO
    Bit::MorseSignals::Emitter, Bit::MorseSignals::Receiver.

AUTHOR
    Vincent Pit, "<perl at profvince.com>"

    You can contact me by mail or on #perl @ FreeNode (vincent or
    Prof_Vince).

BUGS
    Please report any bugs or feature requests to "bug-bit-morsesignals at
    rt.cpan.org", or through the web interface at
    <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Bit-MorseSignals>. I
    will be notified, and then you'll automatically be notified of progress
    on your bug as I make changes.

SUPPORT
    You can find documentation for this module with the perldoc command.

        perldoc Bit::MorseSignals

COPYRIGHT & LICENSE
    Copyright 2008 Vincent Pit, all rights reserved.

    This program is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.

