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PROGRAM:
NAME
snacc - ASN.1 to C, C++ or type table Compiler
SYNOPSIS
snacc [-h] [-P] [-t] [-e] [-d] [-p] [-f]
[-c | -C | -idl | -T <table output file>]
[-u <useful types ASN.1 file>]
[-mf <max file name len>]
[-l <neg number>]
[-meta] [-tcl <module.type>]
[-novolat]
<ASN.1 file list>
For complete and current documentation, refer to the snacc manual.
DESCRIPTION
Snacc (Sample Neufeld Asn.1 to C/C++ Compiler) generates C or C++ source code for BER
encode and decode routines as well as print and free routines for each type in the given
ASN.1 modules. Alternatively, snacc can produce type tables that can be used for table
based/interpreted encoding and decoding. The type table based methods tend to be slower
than their C or C++ counterparts but they usually use less memory (table size vs. C/C++
object code).
Most of the 1990 ASN.1 features are parsed although some do not affect the generated code.
Fairly rigourous error checking is performed on the ASN.1 source; any errors detected will
be reported (printed to stderr).
Each file in the ASN.1 file list should contain a complete ASN.1 module. ASN.1 modules
that use the IMPORTS feature must be compiled together (specify all necessary modules in
the ASN.1 file list). The generated source files will include each module's header file
in the command line order. This makes it important to order the modules from least
dependent to most dependent on the command line to avoid type ordering problems.
Currently, snacc assumes that each ASN.1 file given on the command line depends on all of
the others on the command line. No attempt is made to only include the header files from
modules referenced in the import list for that module.
If the target language is C, snacc will generate a .h and .c file for each specified ASN.1
module. If the target language is C++, snacc will generate a .h and .C file for each
module. The generated file names will be derived from the module names.
OPTIONS
-h Help. Prints a synopsis of snacc and exits.
-c Generate C source code. This is the default behaviour of snacc. Only one of -c ,
-C or -T should be specified.
-C Generate C++ source code.
-novolat
Generate ``return *this'' after calling ``abort()''. (Some broken compilers don't
know about volatile functions, or their abort() isn't correctly typed.)
-meta Generate meta code that describes the generated types. Implies -C.
-tcl module.type[,module.type] Generate code for a Tcl interpreter where module.type are
the top level PDUs. Implies -meta.
-T file
This causes snacc to generate type tables and write them to the given file.
-P This causes snacc to print the parsed ASN.1 modules to stdout after the types have
been linked, sorted, and processed. This option is useful for debugging snacc and
observing the modifications snacc performs on the types to make code generation
simpler.
-t Generate type definitions in the target language for each ASN.1 type.
-v Generate value definitions in the target language for each ASN.1 value. Currently
value definitions are limited to INTEGERs, BOOLEANs and OBJECT IDENTIFIERs.
-e Generate encode routines in the target language for each ASN.1 type.
-d Generate decode routines in the target language for each ASN.1 type.
-p Generate print routines in the target language for each ASN.1 type.
-f Generate free routines in the target language for each ASN.1 type. This option
only works when the target language is C.
If none of the -t, -v, -e, -d, -p, or -f options are given on the command line,
snacc assumes that all of them are in effect. They do not affect type table
generation.
-u file
Read the useful types definitions from the ASN.1 module in file file for linking
purposes. For some ASN.1 specifications, such as SNMP, the useful types are not
needed. The types in the given useful types file are globally available to all
modules; a useful type definition is overridden by a local or explicitly imported
type with the same name. The current list of useful types is:
ObjectDecscriptor
NumericString
PrintableString
TeletexString
T61String
VideoTexString
IA5String
GraphicString
ISO646String
GeneralString
UTCTime
GeneralizedTime
EXTERNAL
-mf number
This causes the generated source files to have a maximum length of number
characters, including their suffix. The number must be at least 3. This option is
useful for supporting operating systems that only support short file names. A
better solution is to shorten the module name of each ASN.1 module.
-l number
This is fairly obscure but may be useful. Each error that the decoders can report
is given an id number. The number number is where the error ids start decreasing
from as they are assigned to errors . The default is -100 if this option is not
given. Avoid using a number in the range -100 to 0 since they may conflict with
the library routines' error ids. If you are re-compiling the useful types for the
library use -50. Another use of this option is to integrate newly generated code
with older code; if done correctly, the error ids will not conflict.
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