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PROGRAM:

NAME


asn1c - ASN.1 Compiler

SYNOPSIS


asn1c [-E [-F] | -P | -R]
[-Sdir] [-X]
[-Wdebug-...] [-foption] [-gen-option] [-pdu={all|auto|Type}]
[-print-option]
infile...

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.

OPTIONS


Overall Options
-E -F -P -R -S directory -X

Warning Options
-Werror -Wdebug-lexer -Wdebug-fixer -Wdebug-compiler

Language Options
-fbless-SIZE -fcompound-names -findirect-choice -fknown-extern-type=<name>
-fnative-types -fno-constraints -fno-include-deps -funnamed-unions -fskeletons-copy

Codecs Generation Options
-gen-PER -pdu={all|auto|Type}

Output Options
-print-constraints -print-lines

OVERALL OPTIONS


-E Stop after the parsing stage and print the reconstructed ASN.1 specification code
to the standard output.

-F Used together with -E, instructs the compiler to stop after the ASN.1 syntax tree
fixing stage and dump the reconstructed ASN.1 specification to the standard output.

-P Dump the compiled output to the standard output instead of creating the target
language files on disk.

-R Restrict the compiler to generate only the ASN.1 tables, omitting the usual support
code.

-S directory
Use the specified directory with ASN.1 skeleton files.

-X Generate an XML DTD schema for the specified ASN.1 files.

WARNING OPTIONS


-Werror
Treat warnings as errors; abort if any warning is produced.

-Wdebug-lexer
Enable lexer debugging during the ASN.1 parsing stage.

-Wdebug-fixer
Enable ASN.1 syntax tree fixer debugging during the fixing stage.

-Wdebug-compiler
Enable debugging during the actual compile time.

LANGUAGE OPTIONS


-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.

-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).

-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
-fno-include-deps to prevent circular references.

-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.

-fnative-types
Use the native machine's data types (int, double) whenever possible, instead of the
compound INTEGER_t, ENUMERATED_t and REAL_t types.

-fno-constraints
Do not generate ASN.1 subtype constraint checking code. This may make a shorter
executable.

-fno-include-deps
Do not generate courtesy #include lines for non-critical type dependencies. Helps
prevent namespace collisions.

-funnamed-unions
Enable unnamed unions in the definitions of target language's structures.

-fskeletons-copy
Copy support files (skeletons) rather than symlink them.

CODECS GENERATION OPTIONS


-gen-PER
Generate Packed Encoding Rules (PER) support code.

-pdu={all|auto|Type}
Create a PDU table for specified types, or discover Protocol Data Units
automatically. In case of -pdu=all, all ASN.1 types defined in all modules will
form a PDU table. In case of -pdu=auto, all types not referenced by any other type
will form a PDU table. If Type 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.

OUTPUT OPTIONS


-print-constraints
When -EF are also specified, this option forces the compiler to explain its
internal understanding of subtype constraints.

-print-lines
Generate "-- #line" comments in -E output.

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