The format of the name of each generated XER encode function is as follows:
asn1XE_[<prefix>]<prodName>
where <prodName>
is the name of the ASN.1
production for which the function is being generated and
<prefix>
is an optional prefix that can be
set via a configuration file setting. The configuration setting used
to set the prefix is the <typePrefix> element. This element
specifies a prefix that will be applied to all generated typedef
names and function names for the production.
The calling sequence for each encode function is as follows:
status = asn1XE_<name> (OSCTXT* pctxt, <name>[*] value, const char* elemName, const char* attributes);
In this definition, <name> denotes the prefixed production name defined above.
The pctxt
argument is used to hold a context pointer
to keep track of encode parameters. This is a basic "handle"
variable that is used to make the function reentrant so it can be
used in an asynchronous or threaded application. The user is
required to supply a pointer to a variable of this type declared
somewhere in his or her or her program.
The value
argument contains the value to be encoded
or holds a pointer to the value to be encoded. This variable is of
the type generated from the ASN.1 production. The object is passed
by value if it is a primitive ASN.1 data type such as BOOLEAN,
INTEGER, ENUMERATED, etc.. It is passed using a pointer reference if
it is a structured ASN.1 type value (in this case, the name will be
pvalue instead of value). Check the generated function prototype in
the header file to determine how this argument is to be passed for a
given function.
The elemName and attributes arguments are used to pass the XML element name and attributes respectively. The elemName argument is the name that will be included in the <name> </name> brackets used to delimit an XML item. There are three distinct ways this argument can be specified:
If it contains standard text, this text will be used as the element name.
If it is null, a default element name will be applied. Default names for all of the built-in ASN.1 types are defined in the 2002 X.680 standard. For example, <BOOLEAN> is the default element name for the BOOLEAN built-in type.
If the name is empty (i.e. equal to “”, a zero-length string – not to be confused with null), then no element name is applied to the encoded data.
The function result variable stat
returns the status
of the encode operation. Status code zero indicates the function was
successful. A negative value indicates encoding failed. Return
status values are defined in the rtxErrCodes.h include file. The error text and a
stack trace can be displayed using the rtxErrPrint function.