.TH ASN1C 1 "\*(Dt" "ASN.1 Compiler" "ASN.1 Compiler"
.SH NAME
asn1c \- ASN.1 Compiler
.SH SYNOPSIS
asn1c [\fB\-E\fR [\fB-F\fR] | \fB\-P\fR | \fB\-R\fR]
      [\fB\-S\fR\fIdir\fR] [\fB-X\fR]
      [\fB\-W\fR\fIdebug-\fR...] [\fB\-f\fR\fIoption\fR] [\fB\-gen-\fR\fIoption\fR] [\fB\-pdu=\fR{\fBall\fR|\fBauto\fR|\fIType\fR}\fR]
      [\fB\-print-\fR\fIoption\fR]
      \fIinfile\fR...
.SH DESCRIPTION
asn1c compiles ASN.1 specifications into a set of
target language (C/C++) encoders and decoders for BER, DER, PER, XER
and other encoding rules.
.SH OPTIONS
.TP
\fIOverall Options\fR
\fB\-E \-F \-P \-R\fR
.BI "\-S " directory
\fB\-X
.TP
\fIWarning Options\fR
.br
\fB\-Werror \-Wdebug-lexer \-Wdebug-fixer \-Wdebug-compiler\fR
.TP
\fILanguage Options\fR
.br
\fB\-fbless-SIZE \-fcompound-names \-findirect-choice
.BI "\-fknown-extern-type="<name>
\fB\-fno-constraints \-fno-include-deps \-funnamed-unions \-fwide-types
.TP
\fICodecs Generation Options\fR
.br
.B \-gen-PER \-pdu=\fR{\fBall\fR|\fBauto\fR|\fIType\fR}
.TP
\fIOutput Options\fR
.br
.B \-print-constraints \-print-lines
.SH OVERALL OPTIONS
.TP
.B \-E
Stop after the parsing stage and print the reconstructed ASN.1
specification code to the standard output.
.TP
.B \-F
Used together with \c
.B \-E\c
, instructs the compiler to stop after the ASN.1 syntax
tree fixing stage and dump the reconstructed ASN.1 specification
to the standard output.
.TP
.B \-P
Dump the compiled output to the standard output instead of creating the
target language files on disk.
.TP
.B \-R
Restrict the compiler to generate only the ASN.1 tables,
omitting the usual support code.
.TP
\fB\-S\fR \fIdirectory\fR
Use the specified directory with ASN.1 skeleton files.
.TP
.B \-X
Generate an XML DTD schema for the specified ASN.1 files.
.SH WARNING OPTIONS
.TP
.B \-Werror
Treat warnings as errors; abort if any warning is produced.
.TP
.B \-Wdebug-lexer
Enable lexer debugging during the ASN.1 parsing stage.
.TP
.B \-Wdebug-fixer
Enable ASN.1 syntax tree fixer debugging during the fixing stage.
.TP
.B \-Wdebug-compiler
Enable debugging during the actual compile time.
.SH LANGUAGE OPTIONS
.TP
.B \-fbless-SIZE
Allow SIZE() constraint for INTEGER, ENUMERATED, and other types for which this
constraint is normally prohibited by the standard. This is a violation of
ASN.1 standard, and the compiler may fail to produce a meaningful code.
.TP
.B \-fcompound-names
Using this option prevents name collisions in the target source code
by using complex names for target language structures. (Name collisions
may occur if the ASN.1 module reuses the same identifiers in multiple
contexts).
.TP
.B \-findirect-choice
When generating code for a CHOICE type, compile the CHOICE members as indirect
pointers instead of declaring them inline. Consider using this option
together with
.B \-fno-include-deps
to prevent circular references.
.TP
.BI "\-fknown-extern-type="<name>
Pretend the specified type is known. The compiler will assume the target
language source files for the given type have been provided manually.
.TP
.B \-fno-constraints
Do not generate ASN.1 subtype constraint checking code. This may make a shorter executable.
.TP
.B \-fno-include-deps
Do not generate courtesy #include lines for non-critical type dependencies.
Helps prevent namespace collisions.
.TP
.B \-funnamed-unions
Enable unnamed unions in the definitions of target language's structures.
.TP
.B \-fwide-types
Use the unbounded size data types (INTEGER_t, ENUMERATED_t, REAL_t) by default,
instead of the native machine's data types (long, double).
.SH CODECS GENERATION OPTIONS
.TP
.B \-gen-PER
Generate Packed Encoding Rules (PER) support code.
.TP
.B \-pdu=\fR{\fBall\fR|\fBauto\fR|\fIType\fR}
Create a PDU table for specified types, or discover Protocol Data Units
automatically. In case of -pdu=\fBall\fR, all ASN.1 types defined in
all modules will form a PDU table. In case of -pdu=\fBauto\fR, all types
not referenced by any other type will form a PDU table.
If \fIType\fR is an ASN.1 type identifier, it is added to a PDU table.
The last form may be specified multiple times to add any number of PDUs.
.SH OUTPUT OPTIONS
.TP
.B \-print-constraints
When -EF are also specified, this option forces the compiler to explain
its internal understanding of subtype constraints.
.TP
.B \-print-lines
Generate "-- #line" comments in \fB-E\fR output.
.SH SEE ALSO
.TP
\&\fIunber\fR\|(1), \&\fIenber\fR\|(1)
.SH AUTHORS
Lev Walkin <vlm@lionet.info>