mirror of https://gerrit.osmocom.org/asn1c
converted from tex
git-svn-id: https://asn1c.svn.sourceforge.net/svnroot/asn1c/trunk@621 59561ff5-6e30-0410-9f3c-9617f08c8826
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@ -41,93 +41,103 @@ Contents</A>
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|||
<!--Table of Contents-->
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<UL>
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<LI><A NAME="tex2html48"
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<LI><A NAME="tex2html50"
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HREF="asn1c-usage.html#SECTION02000000000000000000">ASN.1 Basics</A>
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<UL>
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<LI><A NAME="tex2html49"
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<LI><A NAME="tex2html51"
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HREF="asn1c-usage.html#SECTION02100000000000000000">Abstract Syntax Notation: ASN.1</A>
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<UL>
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<LI><A NAME="tex2html50"
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<LI><A NAME="tex2html52"
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HREF="asn1c-usage.html#SECTION02110000000000000000">Some of the ASN.1 Basic Types</A>
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<UL>
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||||
<LI><A NAME="tex2html51"
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HREF="asn1c-usage.html#SECTION02111000000000000000">The BOOLEAN type</A>
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||||
<LI><A NAME="tex2html52"
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||||
HREF="asn1c-usage.html#SECTION02112000000000000000">The INTEGER type</A>
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||||
<LI><A NAME="tex2html53"
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||||
HREF="asn1c-usage.html#SECTION02113000000000000000">The ENUMERATED type</A>
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||||
HREF="asn1c-usage.html#SECTION02111000000000000000">The BOOLEAN type</A>
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<LI><A NAME="tex2html54"
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||||
HREF="asn1c-usage.html#SECTION02114000000000000000">The OCTET STRING type</A>
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HREF="asn1c-usage.html#SECTION02112000000000000000">The INTEGER type</A>
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<LI><A NAME="tex2html55"
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||||
HREF="asn1c-usage.html#SECTION02115000000000000000">The OBJECT IDENTIFIER type</A>
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HREF="asn1c-usage.html#SECTION02113000000000000000">The ENUMERATED type</A>
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<LI><A NAME="tex2html56"
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||||
HREF="asn1c-usage.html#SECTION02114000000000000000">The OCTET STRING type</A>
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<LI><A NAME="tex2html57"
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HREF="asn1c-usage.html#SECTION02115000000000000000">The OBJECT IDENTIFIER type</A>
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<LI><A NAME="tex2html58"
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HREF="asn1c-usage.html#SECTION02116000000000000000">The RELATIVE-OID type</A>
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</UL>
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<LI><A NAME="tex2html57"
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<LI><A NAME="tex2html59"
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HREF="asn1c-usage.html#SECTION02120000000000000000">Some of the ASN.1 String Types</A>
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<UL>
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<LI><A NAME="tex2html58"
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HREF="asn1c-usage.html#SECTION02121000000000000000">The IA5String type</A>
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<LI><A NAME="tex2html59"
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HREF="asn1c-usage.html#SECTION02122000000000000000">The UTF8String type</A>
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<LI><A NAME="tex2html60"
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||||
HREF="asn1c-usage.html#SECTION02123000000000000000">The NumericString type</A>
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HREF="asn1c-usage.html#SECTION02121000000000000000">The IA5String type</A>
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<LI><A NAME="tex2html61"
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HREF="asn1c-usage.html#SECTION02124000000000000000">The PrintableString type</A>
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HREF="asn1c-usage.html#SECTION02122000000000000000">The UTF8String type</A>
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<LI><A NAME="tex2html62"
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HREF="asn1c-usage.html#SECTION02123000000000000000">The NumericString type</A>
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<LI><A NAME="tex2html63"
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HREF="asn1c-usage.html#SECTION02124000000000000000">The PrintableString type</A>
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<LI><A NAME="tex2html64"
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HREF="asn1c-usage.html#SECTION02125000000000000000">The VisibleString type</A>
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</UL>
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<LI><A NAME="tex2html63"
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<LI><A NAME="tex2html65"
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HREF="asn1c-usage.html#SECTION02130000000000000000">ASN.1 Constructed Types</A>
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<UL>
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<LI><A NAME="tex2html64"
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HREF="asn1c-usage.html#SECTION02131000000000000000">The SEQUENCE type</A>
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<LI><A NAME="tex2html65"
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HREF="asn1c-usage.html#SECTION02132000000000000000">The SET type</A>
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<LI><A NAME="tex2html66"
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HREF="asn1c-usage.html#SECTION02133000000000000000">The CHOICE type</A>
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HREF="asn1c-usage.html#SECTION02131000000000000000">The SEQUENCE type</A>
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<LI><A NAME="tex2html67"
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HREF="asn1c-usage.html#SECTION02134000000000000000">The SEQUENCE OF type</A>
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HREF="asn1c-usage.html#SECTION02132000000000000000">The SET type</A>
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<LI><A NAME="tex2html68"
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HREF="asn1c-usage.html#SECTION02133000000000000000">The CHOICE type</A>
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<LI><A NAME="tex2html69"
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HREF="asn1c-usage.html#SECTION02134000000000000000">The SEQUENCE OF type</A>
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<LI><A NAME="tex2html70"
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HREF="asn1c-usage.html#SECTION02135000000000000000">The SET OF type</A>
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</UL>
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</UL>
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</UL><BR>
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<LI><A NAME="tex2html69"
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<LI><A NAME="tex2html71"
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HREF="asn1c-usage.html#SECTION03000000000000000000">Using the ASN.1 Compiler</A>
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<UL>
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<LI><A NAME="tex2html70"
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HREF="asn1c-usage.html#SECTION03100000000000000000">Introduction to the ASN.1 Compiler</A>
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<LI><A NAME="tex2html71"
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HREF="asn1c-usage.html#SECTION03200000000000000000">Quick start</A>
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<LI><A NAME="tex2html72"
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HREF="asn1c-usage.html#SECTION03100000000000000000">Introduction to the ASN.1 Compiler</A>
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<LI><A NAME="tex2html73"
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HREF="asn1c-usage.html#SECTION03200000000000000000">Quick start</A>
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<LI><A NAME="tex2html74"
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HREF="asn1c-usage.html#SECTION03300000000000000000">Using the ASN.1 Compiler</A>
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<UL>
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<LI><A NAME="tex2html73"
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HREF="asn1c-usage.html#SECTION03310000000000000000">Command-line options</A>
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<LI><A NAME="tex2html74"
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HREF="asn1c-usage.html#SECTION03320000000000000000">Recognizing compiler output</A>
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<LI><A NAME="tex2html75"
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HREF="asn1c-usage.html#SECTION03310000000000000000">Command-line options</A>
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<LI><A NAME="tex2html76"
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HREF="asn1c-usage.html#SECTION03320000000000000000">Recognizing compiler output</A>
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<LI><A NAME="tex2html77"
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HREF="asn1c-usage.html#SECTION03330000000000000000">Invoking the ASN.1 helper code from an application</A>
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<UL>
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<LI><A NAME="tex2html76"
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HREF="asn1c-usage.html#SECTION03331000000000000000">Decoding BER</A>
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<LI><A NAME="tex2html77"
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HREF="asn1c-usage.html#SECTION03332000000000000000">Encoding DER</A>
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<LI><A NAME="tex2html78"
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HREF="asn1c-usage.html#SECTION03333000000000000000">Encoding XER</A>
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HREF="asn1c-usage.html#SECTION03331000000000000000">Decoding BER</A>
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<LI><A NAME="tex2html79"
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HREF="asn1c-usage.html#SECTION03334000000000000000">Validating the target structure</A>
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HREF="asn1c-usage.html#SECTION03332000000000000000">Encoding DER</A>
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<LI><A NAME="tex2html80"
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HREF="asn1c-usage.html#SECTION03335000000000000000">Printing the target structure</A>
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HREF="asn1c-usage.html#SECTION03333000000000000000">Encoding XER</A>
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<LI><A NAME="tex2html81"
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HREF="asn1c-usage.html#SECTION03334000000000000000">Validating the target structure</A>
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<LI><A NAME="tex2html82"
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HREF="asn1c-usage.html#SECTION03335000000000000000">Printing the target structure</A>
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<LI><A NAME="tex2html83"
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HREF="asn1c-usage.html#SECTION03336000000000000000">Freeing the target structure</A>
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</UL>
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</UL>
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</UL><BR>
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<LI><A NAME="tex2html82"
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<LI><A NAME="tex2html84"
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HREF="asn1c-usage.html#SECTION04000000000000000000">Examples</A>
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<LI><A NAME="tex2html83"
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<UL>
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<LI><A NAME="tex2html85"
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HREF="asn1c-usage.html#SECTION04100000000000000000">Step by step examples</A>
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<UL>
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<LI><A NAME="tex2html86"
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HREF="asn1c-usage.html#SECTION04110000000000000000">A ''Rectangle'' Encoder</A>
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<LI><A NAME="tex2html87"
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HREF="asn1c-usage.html#SECTION04120000000000000000">A ''Rectangle'' Decoder</A>
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</UL>
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</UL><BR>
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<LI><A NAME="tex2html88"
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HREF="asn1c-usage.html#SECTION05000000000000000000">Bibliography</A>
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</UL>
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<!--End of Table of Contents-->
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@ -570,7 +580,7 @@ language structures and surrounding maintenance code. For example,
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the C structure which may be created by compiler to represent the
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simple <I>Rectangle</I> specification defined earlier in this document,
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may look like this<A NAME="tex2html2"
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HREF="#foot574"><SUP>2.2</SUP></A>:
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HREF="#foot739"><SUP>2.2</SUP></A>:
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<P>
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@ -596,8 +606,8 @@ Quick start</A>
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<P>
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After building and installing the compiler, the <I>asn1c</I><A NAME="tex2html4"
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HREF="#foot575"><SUP>3.1</SUP></A> command may be used to compile the ASN.1 specification<A NAME="tex2html5"
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HREF="#foot576"><SUP>3.2</SUP></A>:
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HREF="#foot740"><SUP>3.1</SUP></A> command may be used to compile the ASN.1 specification<A NAME="tex2html5"
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HREF="#foot741"><SUP>3.2</SUP></A>:
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<P>
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@ -663,7 +673,7 @@ the compiler's behavior.
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<P>
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<BR><P></P>
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<DIV ALIGN="CENTER"><A NAME="579"></A>
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<DIV ALIGN="CENTER"><A NAME="744"></A>
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<TABLE>
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<CAPTION><STRONG><A NAME=Table1>Table 1:</A></STRONG>
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The list of asn1c command line options</CAPTION>
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@ -807,7 +817,7 @@ be possible to compile everything with the single instruction:
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<BLOCKQUOTE><PRE>
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cc -o rectangle *.c # It could be <I>that</I> simple<A NAME="tex2html7"
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HREF="#foot582"><SUP>4.1</SUP></A>
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HREF="#foot747"><SUP>4.1</SUP></A>
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</PRE>
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</BLOCKQUOTE>
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@ -1059,19 +1069,6 @@ function, which is somewhat simpler:
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<P>
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<BLOCKQUOTE><PRE>
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/*
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* This is a custom function which writes the
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* encoded output into some FILE stream.
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*/
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static int
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write_stream(const void *buffer, size_t size, void *app_key) {
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FILE *ostream = app_key;
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size_t wrote;
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wrote = fwrite(buffer, 1, size, ostream);
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return (wrote == size) ? 0 : -1;
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}
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/*
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* This is the serializer itself,
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@ -1112,7 +1109,7 @@ DER encoder will essentially do the same thing (i.e., encode the data)
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but no callbacks will be invoked (so the data goes nowhere). It may
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prove useful to determine the size of the structure's encoding before
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actually doing the encoding<A NAME="tex2html9"
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HREF="#foot329"><SUP>4.3</SUP></A>.
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HREF="#foot322"><SUP>4.3</SUP></A>.
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<P>
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Please look into der_encoder.h for the precise definition of der_encode()
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@ -1299,11 +1296,159 @@ Examples</A>
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<P>
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<H1><A NAME="SECTION04100000000000000000">
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Step-by-step: A ''Rectangle'' Decoder</A>
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Step by step examples</A>
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</H1>
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<P>
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This chapter will help you to create a simple decoder of a simple
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<H1><A NAME="SECTION04110000000000000000">
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A ''Rectangle'' Encoder</A>
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</H1>
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<P>
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This chapter will help you to create a simple BER and XER encoder
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of a ''Rectangle'' type used throughout this document.
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<P>
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<OL>
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<LI>Create a file named <B>rectangle.asn1</B> with the following contents:
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<P>
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<BLOCKQUOTE><PRE>
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RectangleModule1 DEFINITIONS ::=
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BEGIN
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Rectangle ::= SEQUENCE {
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height INTEGER,
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width INTEGER
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}
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END
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</PRE>
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</BLOCKQUOTE>
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</LI>
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<LI>Compile it into the set of .c and .h files using asn1c compiler [<A
|
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HREF="asn1c-usage.html#ASN1C">ASN1C</A>]:
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<P>
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<BLOCKQUOTE><PRE>
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<I>asn1c -fnative-types</I> <B>rectangle.asn1</B>
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</PRE>
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</BLOCKQUOTE>
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</LI>
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<LI>Alternatively, use the Online ASN.1 compiler [<A
|
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HREF="asn1c-usage.html#AONL">AONL</A>] by uploading
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the <B>rectangle.asn1</B> file into the Web form and unpacking the
|
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produced archive on your computer.
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</LI>
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<LI>By this time, you should have gotten multiple files in the current
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directory, including the <B>Rectangle.c</B> and <B>Rectangle.h</B>.
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</LI>
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<LI>Create a main() routine which creates the Rectangle_t structure in
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memory and encodes it using BER and XER encoding rules. Let's name
|
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the file <B>main.c</B>:
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<P>
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<BLOCKQUOTE><PRE>
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<FONT SIZE="-1">#include <stdio.h></FONT>
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<FONT SIZE="-1">#include <sys/types.h></FONT>
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<FONT SIZE="-1">#include <Rectangle.h> /* Rectangle ASN.1 type */</FONT>
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<FONT SIZE="-1">/*</FONT>
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<FONT SIZE="-1">* This is a custom function which writes the</FONT>
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<FONT SIZE="-1">* encoded output into some FILE stream.</FONT>
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<FONT SIZE="-1">*/</FONT>
|
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<FONT SIZE="-1">static int</FONT>
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<FONT SIZE="-1">write_out(const void *buffer, size_t size, void *app_key) {</FONT>
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<FONT SIZE="-1"> FILE *out_fp = app_key;</FONT>
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<FONT SIZE="-1"> size_t wrote;</FONT>
|
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|
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<FONT SIZE="-1"> wrote = fwrite(buffer, 1, size, out_fp);</FONT>
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|
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<FONT SIZE="-1"> return (wrote == size) ? 0 : -1;</FONT>
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<FONT SIZE="-1">}</FONT>
|
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|
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<FONT SIZE="-1">int main(int ac, char *av) {</FONT>
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<FONT SIZE="-1"> Rectangle_t *rectangle; /* Type to encode */</FONT>
|
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<FONT SIZE="-1"> asn_enc_rval_t ec; /* Encoder return value */</FONT>
|
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|
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<FONT SIZE="-1"> /* Allocate the Rectangle_t */</FONT>
|
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<FONT SIZE="-1"> rectangle = calloc(1, sizeof(Rectangle_t); /* not malloc! */</FONT>
|
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<FONT SIZE="-1"> if(!rectangle) {</FONT>
|
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<FONT SIZE="-1"> perror(''calloc() failed'');</FONT>
|
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<FONT SIZE="-1"> exit(71); /* better, EX_OSERR */</FONT>
|
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<FONT SIZE="-1"> }</FONT>
|
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|
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<FONT SIZE="-1"> /* Initialize the Rectangle members */</FONT>
|
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<FONT SIZE="-1"> rectangle->height = 42; /* any random value */</FONT>
|
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<FONT SIZE="-1"> rectangle->width = 23; /* any random value */</FONT>
|
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<FONT SIZE="-1"> </FONT>
|
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<FONT SIZE="-1"> /* BER encode the data if filename is given */</FONT>
|
||||
<FONT SIZE="-1"> if(ac < 2) {</FONT>
|
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<FONT SIZE="-1"> fprintf(stderr, ''Specify filename for BER output\n'');</FONT>
|
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<FONT SIZE="-1"> } else {</FONT>
|
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<FONT SIZE="-1"> const char *filename = av[1];</FONT>
|
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<FONT SIZE="-1"> FILE *fp = fopen(filename, ''w''); /* for BER output */</FONT>
|
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|
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<FONT SIZE="-1"> if(!fp) {</FONT>
|
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<FONT SIZE="-1"> perror(filename);</FONT>
|
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<FONT SIZE="-1"> exit(71); /* better, EX_OSERR */</FONT>
|
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<FONT SIZE="-1"> }</FONT>
|
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<FONT SIZE="-1"> </FONT>
|
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<FONT SIZE="-1"> /* Encode the Rectangle type as BER (DER) */</FONT>
|
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<FONT SIZE="-1"> ec = der_encode(&asn_DEF_Rectangle,</FONT>
|
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<FONT SIZE="-1"> rectangle, write_out, stream);</FONT>
|
||||
<FONT SIZE="-1"> fclose(fp);</FONT>
|
||||
<FONT SIZE="-1"> if(ec.encoded == -1) {</FONT>
|
||||
<FONT SIZE="-1"> fprintf(stderr,</FONT>
|
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<FONT SIZE="-1"> ''Could not encode Rectangle (at %s)\n'',</FONT>
|
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<FONT SIZE="-1"> ec.failed_type ? ec.failed_type->name : ''unknown'');</FONT>
|
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<FONT SIZE="-1"> exit(65); /* better, EX_DATAERR */</FONT>
|
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<FONT SIZE="-1"> } else {</FONT>
|
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<FONT SIZE="-1"> fprintf(stderr, ''Created %s with BER encoded Rectangle\n'',</FONT>
|
||||
<FONT SIZE="-1"> filename);</FONT>
|
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<FONT SIZE="-1"> }</FONT>
|
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<FONT SIZE="-1"> }</FONT>
|
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|
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<FONT SIZE="-1"> /* Also print the constructed Rectangle XER encoded (XML) */</FONT>
|
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<FONT SIZE="-1"> xer_fprint(stdout, &asn_DEF_Rectangle, rectangle);</FONT>
|
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|
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<FONT SIZE="-1"> return 0; /* Encoding finished successfully */</FONT>
|
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<FONT SIZE="-1">}</FONT>
|
||||
</PRE>
|
||||
</BLOCKQUOTE>
|
||||
|
||||
</LI>
|
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<LI>Compile all files together using C compiler (varies by platform):
|
||||
|
||||
<P>
|
||||
|
||||
<BLOCKQUOTE><PRE>
|
||||
<I>cc -I. -o</I> <B><I>rencode</I></B> <I>*.c</I>
|
||||
</PRE>
|
||||
</BLOCKQUOTE>
|
||||
|
||||
</LI>
|
||||
<LI>Voila! You have just created the BER and XER encoder of a Rectangle
|
||||
type, named <B>rencode</B>!
|
||||
</LI>
|
||||
</OL>
|
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|
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|
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<P>
|
||||
|
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<H1><A NAME="SECTION04120000000000000000">
|
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A ''Rectangle'' Decoder</A>
|
||||
</H1>
|
||||
|
||||
<P>
|
||||
This chapter will help you to create a simple BER decoder of a simple
|
||||
''Rectangle'' type used throughout this document.
|
||||
|
||||
<P>
|
||||
|
|
@ -1417,7 +1562,8 @@ it as it were a BER-encoded Rectangle type, and prints out the text
|
|||
</BLOCKQUOTE>
|
||||
|
||||
</LI>
|
||||
<LI>Voila! You have just created the Rectangle type decoder named <B>rdecode</B>!
|
||||
<LI>Voila! You have just created the BER decoder of a Rectangle type,
|
||||
named <B>rdecode</B>!
|
||||
</LI>
|
||||
</OL>
|
||||
<H2><A NAME="SECTION05000000000000000000">
|
||||
|
|
@ -1442,7 +1588,7 @@ ISBN:0-12-6333361-0.
|
|||
not a definitive factor.
|
||||
|
||||
</DD>
|
||||
<DT><A NAME="foot574">... this</A><A
|
||||
<DT><A NAME="foot739">... this</A><A
|
||||
HREF="asn1c-usage.html#tex2html2"><SUP>2.2</SUP></A></DT>
|
||||
<DD><I>-fnative-types</I> compiler option is used to produce basic C <I>int</I>
|
||||
types instead of infinite width INTEGER_t structures. See <A HREF=#Table1>Table 1</A>.
|
||||
|
|
@ -1454,19 +1600,19 @@ types instead of infinite width INTEGER_t structures. See <A HREF=#Table1>Table
|
|||
text (XML) based.
|
||||
|
||||
</DD>
|
||||
<DT><A NAME="foot575">...asn1c</A><A
|
||||
<DT><A NAME="foot740">...asn1c</A><A
|
||||
HREF="asn1c-usage.html#tex2html4"><SUP>3.1</SUP></A></DT>
|
||||
<DD>The 1 symbol in asn<B>1</B>c is a digit, not an ''ell'' letter.
|
||||
|
||||
</DD>
|
||||
<DT><A NAME="foot576">... specification</A><A
|
||||
<DT><A NAME="foot741">... specification</A><A
|
||||
HREF="asn1c-usage.html#tex2html5"><SUP>3.2</SUP></A></DT>
|
||||
<DD>This is probably <B>not</B> what you want to try out right now -
|
||||
read through the rest of this chapter to find out about <B>-P</B>
|
||||
and <B>-R</B> options.
|
||||
|
||||
</DD>
|
||||
<DT><A NAME="foot582">...that simple</A><A
|
||||
<DT><A NAME="foot747">...that simple</A><A
|
||||
HREF="asn1c-usage.html#tex2html7"><SUP>4.1</SUP></A></DT>
|
||||
<DD>Provided that you've also created a .c file with the <I>int main()</I>
|
||||
routine.
|
||||
|
|
@ -1479,7 +1625,7 @@ it will fail, but may later be invoked again with the rest of the
|
|||
buffer to continue decoding.
|
||||
|
||||
</DD>
|
||||
<DT><A NAME="foot329">... encoding</A><A
|
||||
<DT><A NAME="foot322">... encoding</A><A
|
||||
HREF="asn1c-usage.html#tex2html9"><SUP>4.3</SUP></A></DT>
|
||||
<DD>It is actually faster too: the encoder might skip over some computations
|
||||
which aren't important for the size determination.
|
||||
|
|
@ -1488,7 +1634,7 @@ which aren't important for the size determination.
|
|||
</DL><BR><HR>
|
||||
<ADDRESS>
|
||||
Lev Walkin
|
||||
2005-01-17
|
||||
2005-01-31
|
||||
</ADDRESS>
|
||||
</BODY>
|
||||
</HTML>
|
||||
|
|
|
|||
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Reference in New Issue