IMAP4 non-synchronizing literals (Obsoleted)

Network Working Group                                           J. Myers
Request for Comments: 2088                               Carnegie Mellon
Cateogry: Standards Track                                   January 1997


                    <span class="h1">IMAP4 non-synchronizing literals</span>

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>.   Abstract</span>

   The Internet Message Access Protocol [<a href="#ref-IMAP4" title=""Internet Message Access Protocol - Version 4"">IMAP4</a>] contains the "literal"
   syntactic construct for communicating strings.  When sending a
   literal from client to server, IMAP4 requires the client to wait for
   the server to send a command continuation request between sending the
   octet count and the string data.  This document specifies an
   alternate form of literal which does not require this network round
   trip.

<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>.   Conventions Used in this Document</span>

   In examples, "C:" and "S:" indicate lines sent by the client and
   server respectively.

<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>.   Specification</span>

   The non-synchronizing literal is added an alternate form of literal,
   and may appear in communication from client to server instead of the
   IMAP4 form of literal.  The IMAP4 form of literal, used in
   communication from client to server, is referred to as a
   synchronizing literal.

   Non-synchronizing literals may be used with any IMAP4 server
   implementation which returns "LITERAL+" as one of the supported
   capabilities to the CAPABILITY command.  If the server does not
   advertise the LITERAL+ capability, the client must use synchronizing
   literals instead.

   The non-synchronizing literal is distinguished from the original
   synchronizing literal by having a plus ('+') between the octet count
   and the closing brace ('}').  The server does not generate a command
   continuation request in response to a non-synchronizing literal, and



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<span id="page-2" ></span>
<span class="grey"><a href="./rfc2088">RFC 2088</a>                        LITERAL                     January 1997</span>


   clients are not required to wait before sending the octets of a non-
   synchronizing literal.

   The protocol receiver of an IMAP4 server must check the end of every
   received line for an open brace ('{') followed by an octet count, a
   plus ('+'), and a close brace ('}') immediately preceeding the CRLF.
   If it finds this sequence, it is the octet count of a non-
   synchronizing literal and the server MUST treat the specified number
   of following octets and the following line as part of the same
   command.  A server MAY still process commands and reject errors on a
   line-by-line basis, as long as it checks for non-synchronizing
   literals at the end of each line.

   Example:    C: A001 LOGIN {11+}
               C: FRED FOOBAR {7+}
               C: fat man
               S: A001 OK LOGIN completed

<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>.   Formal Syntax</span>

   The following syntax specification uses the augmented Backus-Naur
   Form (BNF) notation as specified in [<a href="./rfc822" title=""Standard for the Format of ARPA Internet Text Messages"">RFC-822</a>] as modified by [<a href="#ref-IMAP4" title=""Internet Message Access Protocol - Version 4"">IMAP4</a>].
   Non-terminals referenced but not defined below are as defined by
   [<a href="#ref-IMAP4" title=""Internet Message Access Protocol - Version 4"">IMAP4</a>].

   literal         ::= "{" number ["+"] "}" CRLF *CHAR8
                       ;; Number represents the number of CHAR8 octets

<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>.   References</span>

   [<a id="ref-IMAP4">IMAP4</a>] Crispin, M., "Internet Message Access Protocol - Version 4",
   <a href="./draft-crispin-imap-base-XX.txt">draft-crispin-imap-base-XX.txt</a>, University of Washington, April 1996.

   [<a id="ref-RFC-822">RFC-822</a>] Crocker, D., "Standard for the Format of ARPA Internet Text
   Messages", STD 11, <a href="./rfc822">RFC 822</a>.

<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>.   Security Considerations</span>

   There are no known security issues with this extension.

<span class="h2"><a class="selflink" id="section-8" href="#section-8">8</a>.   Author's Address</span>

   John G. Myers
   Carnegie-Mellon University
   5000 Forbes Ave.
   Pittsburgh PA, 15213-3890

   Email: [email protected]



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