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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
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The R13B03 release.OTP_R13B03
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+<!doctype chapter PUBLIC "-//Stork//DTD chapter//EN">
+<!--
+ ``The contents of this file are subject to the Erlang Public License,
+ Version 1.1, (the "License"); you may not use this file except in
+ compliance with the License. You should have received a copy of the
+ Erlang Public License along with this software. If not, it can be
+ retrieved via the world wide web at http://www.erlang.org/.
+
+ Software distributed under the License is distributed on an "AS IS"
+ basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ the License for the specific language governing rights and limitations
+ under the License.
+
+ The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+ Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+ AB. All Rights Reserved.''
+
+ $Id$
+-->
+<chapter>
+ <header>
+ <title>ASN1 Release Notes</title>
+ <prepared>Kenneth Lundin</prepared>
+ <responsible>Kenneth Lundin</responsible>
+ <docno></docno>
+ <approved>Kenneth Lundin</approved>
+ <checked>Kenneth Lundin</checked>
+ <date>97-10-07</date>
+ <rev>A</rev>
+ <file>notes_latest.sgml</file>
+ </header>
+
+ <p>This document describes the changes made to the asn1 application.
+
+ <section>
+ <title>ASN1 0.8.1</title>
+ <p>This is the first release of the ASN1 application. This version is released
+ for beta-testing. Some functionality will be added until the 1.0 version is
+ released. A list of missing features and restrictions can be found in the
+ chapter below.
+
+ <section>
+ <title>Missing features and other restrictions</title>
+ <list>
+ <item>
+ <p>The encoding rules BER and PER (aligned) is supported. <em>PER (unaligned)
+ IS NOT SUPPORTED</em>.
+ <item>
+ <p>NOT SUPPORTED types <c>ANY</c> and <c>ANY DEFINED BY</c>
+ (is not in the standard any more).
+ <item>
+ <p>NOT SUPPORTED types <c>EXTERNAL</c> and <c>EMBEDDED-PDV</c>.
+ <item>
+ <p>NOT SUPPORTED type <c>REAL</c> (planned to be implemented).
+ <item>
+ <p>The code generation support for value definitions in the ASN.1 notation is very limited
+ (planned to be enhanced).
+ <item>
+ <p>The support for constraints is limited to:
+ <list>
+ <item><p>
+ SizeConstraint SIZE(X)
+ <item><p>
+ SingleValue (1)
+ <item><p>
+ ValueRange (X..Y)
+ <item><p>
+ PermittedAlpabet FROM (but not for BMPString and UniversalString when generating PER).
+ </list>
+ <p>Complex expressions in constraints is not supported (planned to be extended).
+ <item>
+ <p>The current version of the compiler has very limited error checking:
+ <list>
+ <item><p>Stops at first syntax error.
+ <item><p>Does not stop when a reference to an undefined type is found ,
+ but prints an error message. Compilation of the generated
+ Erlang module will then fail.
+ <item><p>A whole number of other semantical controls is currently missing. This
+ means that the compiler will give little or bad help to detect what's wrong
+ with an ASN.1 specification, but will mostly work very well when the
+ ASN.1 specification is correct.
+ </list>
+ <item>
+ <p>The maximum INTEGER supported in this version is a signed 64 bit integer. This
+ limitation is probably quite reasonable. (Planned to be extended).
+ <item>
+ <p>Only AUTOMATIC TAGS supported for PER.
+ <item>
+ <p>Only EXPLICIT and IMPLICIT TAGS supported for BER.
+ <item>
+ <p>The compiler supports decoding of BER-data with indefinite length but it is
+ not possible to produce data with indefinite length with the encoder.
+ </list>
+ </section>
+
+ </section>
+</chapter>
+
+
+