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What is pycrate
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===============
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Pycrate is a french word for qualifying bad wine.
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The present software library has nothing to do with bad wine, it is simply a
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Python library for manipulating various digital formats in an easy way.
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It is the glorious successor of [libmich](https://github.com/mitshell/libmich),
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which was started 8 years ago and served well.
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Installation
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============
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Operating systems and Python version
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------------------------------------
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The library is designed to work with both Python 2 (2.7) and Python 3 (3.4, 3.5 and greater),
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from the official Python implementation [CPython](https://www.python.org/).
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It is also supporting alternative Python engine such as [pypy](http://pypy.org/) or
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[nuitka](http://nuitka.net/).
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It is regularly tested both on Linux and Windows, and should actually work on any
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operating system which has [r|d]ecent Python support (as in 2017).
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Dependencies
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------------
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Currently none. Only the Python builtins and few internal modules of Python
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(e.g. os, system, re) are required.
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Automatic installation
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----------------------
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An installation script is available.
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It installs the library within your Python package directory:
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```
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python setup.py install
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```
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It is also possible to test the library before installing it
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(this will create two local directories *./test_asn/* and *./pycrate.egg-info/* that
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you can just delete afterwards):
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```
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python setup.py test
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```
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Or to build the library without installing it in the system:
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```
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python setup.py build
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```
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It is also possible to recompile all ASN.1 modules, this will take few minutes
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(but if I did not do any mistake, all ASN.1 modules provided in *./pycrate_asn1dir/*
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should have been compiled with the last version nof the compiler):
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```
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python -m pycrate_asn1c.proc
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```
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License
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=======
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The whole library is licensed under GPLv2 and is compatible with more recent version
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of the GPL: all licensed files have an header making it self-explanatory.
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Contact and support
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==================
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As the unique developper of the library, I am the only person to contact:
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michau \[dot\] benoit \[at\] gmail \[dot\] com
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Extending the library
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=====================
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If you are willing to extend the library, do not hesitate to contact me by
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email or through the github service. Any patch or submission is very welcome!
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Moreover, in case you are using this library in any of your project and you
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find it useful, do not hesitate to drop me an email.
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It is always a pleasure to know where code provided on the Internet can end
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up...
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Components
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==========
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Pycrate is actually more a software suite than a single library. It is composed
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of several subdirectories, each providing specific services.
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pycrate_core
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------------
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The core of the library.
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* *utils* provides basics functions to manipulate integers, bytes and bits
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* *charpy* provides the Charpy class to handle easily the consumption of a bit-stream
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* *elt* and *base* are providing several classes to help when building complex
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data structures
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* *repr* provides simple functions to help with the representation of instances
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from the *elt* and *base* modules
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Some of the most useful features are provided by the *pack_val()* functions from
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the *utils* module and the *Charpy* class from the *charpy* module.
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They help to deal easily with packing and unpacking bytes and integers
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(signed / unsigned, little / big endian) in an aligned and unaligned way.
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All lengths of fields are provided in bits, hence facilitating the handling of
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unaligned structures.
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pycrate_ether
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-------------
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The modules provided here implement Ethernet and IP-oriented protocols and formats.
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* *Ethernet* with structures for Ethernet and VLAN headers
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* *ARP* simply providing the structure for ARP
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* *IP* with structures for IPv4, IPv6, ICMP, UDP and TCP
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* *PCAP* with structures for the PCAP global header and the record header
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pycrate_media
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-------------
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The modules here implement various multimedia formats.
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* *JPEG* with detailed structures used in the JPEG format
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* *GIF* with detailed structures used in the GIF format
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* *TIFF* with detailed structures used in the TIFF format
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* *BMP* with structures used in the BMP format
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* *PNG* with the basic structure used in the PNG format
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* *MPEG4* with the basic structure used in the MPEG4 file format
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* *MP3* with detailed structures used in the MP3 format, including ID3v1 and ID3v2 tags
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Most of the classes here implement complete recipe to parse all of those format in a
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single shot, by using their *from_char()* method.
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pycrate_asn1c
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-------------
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All the modules here serve the sole purpose of compiling ASN.1 specifications.
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The most important ones are:
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* *asnobj* which is the almighty class when parsing any ASN.1 definition
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* *generator* which provides two distinct generators to produce source files from
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the ASN.1 objects processed in Python: *PycrateGenerator* which produces source
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file to be used with the pycrate ASN.1 runtime (in *pycrate_asn1rt*),
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and *JSONDepGraphGenerator* which produces json file listing object dependencies
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(which then can be browsed dynamically thanks to D3).
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* *proc* which is the top-level module for the compiler, it contains for example
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the *compile_text()* function which compiles a serie of ASN.1 modules into
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Python objects
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This compiler support most of the ASN.1 language features, including parameterization and
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class objects and sets (especially useful when working with table constraints).
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It has however few restrictions, the biggest being the need for the left part of the ASN.1
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assignment *::=* being on a single line. Also, old-school ASN.1 macros are not supported ;
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hence, the compiler cannot parse SNMP MIBs.
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pycrate_asn1dir
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---------------
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This subdirectory contains several ASN.1 specifications that are supported and
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precompiled for pycrate. Very few specifications have been changed in order to
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work with pycrate :
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* Q.775, in which the terrible *AllPackagesAS* is commented out
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* Q.773 and Q.775, in which the *TCInvokeIdSet* constraint is modified to be easier
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used as a set of values
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That's all !
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pycrate_asn1rt
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--------------
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This subdirectory contains the ASN.1 runtime, that is loaded and used by the ASN.1
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specifications that are compiler with the compiler in *pycrate_asn1c*. It supports
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the PER encoding rules (aligned and not, canonical also), and the BER, CER and
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DER encoding rules.
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|
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Usage
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||||
=====
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Most of the modules have doc strings. I try also to write readable sources and to
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comment them as much as possible for understanding them easily (and to allow also
|
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myself to understand my own code years after...).
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||||
In a near future, a wiki may be provided to bring examples and methods on how to
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use the different modules (any contribution is welcome on this, too).
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||||
Finally, the code provided in the test/ subdirectory is also representative on
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how to use the different modules.
|
||||
|
||||
|
||||
ASN.1 usage
|
||||
===========
|
||||
|
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|
||||
Tools
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||||
=====
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|
||||
Two different tools are provided (yet):
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||||
* *pycrate_showmedia.py* parses some media files (jpg, bmp, gif, mp3, png,
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||||
tiff, mpeg4) and pretty print the file structure on the standard output.
|
||||
* *pycrate_asn1compile.py* compiles ASN.1 source file(s) and produce a Python
|
||||
source file that makes use of the ASN.1 runtime. This source file is then
|
||||
usable to encode / decode any ASN.1 object from the compiled ASN.1
|
||||
specification.
|
||||
|
||||
Examples
|
||||
========
|
||||
|
||||
It is possible to test the *pycrate_showmedia.py* tool with media test files
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||||
provided in *./test/res/*, or any other supported media file.
|
||||
|
||||
```console
|
||||
$ ./tools/pycrate_showmedia.py --help
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||||
usage: pycrate_showmedia.py [-h] [-bl BL] [-wt] input
|
||||
|
||||
print the internal structure of the input media file,supported formats are:
|
||||
BMP, GIF, JPEG, MP3, MPEG4, PNG, TIFF
|
||||
|
||||
positional arguments:
|
||||
input input media file
|
||||
|
||||
optional arguments:
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||||
-h, --help show this help message and exit
|
||||
-bl BL maximum length for buffer representation
|
||||
-wt show also absent / transparent fields
|
||||
|
||||
$ ./tools/pycrate_showmedia.py ./test/res/xkcd_wireless_signal.png
|
||||
### PNG ###
|
||||
<sig [PNG signature] : '\x89PNG\r\n\x1a\n'>
|
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### PNGBody ###
|
||||
### PNGChunk ###
|
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<len [chunk length] : 13>
|
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<type [chunk type] : 'IHDR'>
|
||||
### IHDR ###
|
||||
<width : 238>
|
||||
<height : 415>
|
||||
<depth [bit depth] : 8>
|
||||
<color [color type] : 0>
|
||||
<comp [compression method] : 0>
|
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<filter [filter method] : 0>
|
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<interlace [interlace method] : 0>
|
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<crc [chunk CRC32] : 0x7d8cb12e>
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### PNGChunk ###
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|
||||
46 22 23 61 90 65 ec 3f 64 f9 d9 bf c8 32 f6 41 | 'F"#a\x90e\xec?d\xf9\xd9\xbf\xc82\xf6A'
|
||||
dc 8d 7d 90 65 ec 83 dc 8c fd 77 13 19 b2 0c 92 | '\xdc\x8d}\x90e\xec\x83\xdc\x8c\xfdw\x13\x19\xb2\x0c\x92'
|
||||
26 a9 a6 bd 69 3d 73 ce 79 fe fe b8 ae 93 4a e9 | '&\xa9\xa6\xbdi=s\xcey\xfe\xfe\xb8\xae\x93J\xe9'
|
||||
94 ea be ef cf ed fd 8f e3 5c 57 d7 b9 1e d7 f5 | '\x94\xea\xbe\xef\xcf\xed\xfd\x8f\xe3\\W\xd7\xb9\x1e\xd7\xf5'
|
||||
5e 5e fb 1b 81 f8 0f b5 ff 0b 90 59 fd 67 9a 1c | '^^\xfb\x1b\x81\xf8\x0f\xb5\xff\x0b\x90Y\xfdg\x9a\x1c'
|
||||
80 2b ff 33 cd e7 37 ee 6f dc df b8 bf 71 7f e3 | '\x80+\xff3\xcd\xe77\xeeo\xdc\xdf\xb8\xbfq\x7f\xe3'
|
||||
fe c6 fd 8d fb 1b f7 37 6e cb e2 ae 8b fc f1 bb | '\xfe\xc6\xfd\x8d\xfb\x1b\xf77n\xcb\xe2\xae\x8b\xfc\xf1\xbb'
|
||||
0b f3 35 35 fe 5f 7a 78 42 77 af be 1b 72 ea be | '\x0b\xf355\xfe_zxBw\xaf\xbe\x1br\xea\xbe'
|
||||
42 f9 eb fa 7f 38 f7 c5 b7 9f dd 57 f6 e5 93 8f | 'B\xf9\xeb\xfa\x7f8\xf7\xc5\xb7\x9f\xddW\xf6\xe5\x93\x8f'
|
||||
b4 35 bf 7a a5 23 c9 a2 c4 94 ea bf 3f f7 64 f5 | '\xb45\xbfz\xa5#\xc9\xa2\xc4\x94\xea\xbf?\xf7d\xf5'
|
||||
53 34 b7 2a aa 3e 67 cc 5e 5a d4 18 5c 77 73 5d | 'S4\xb7*\xaa>g\xcc^Z\xd4\x18\\ws]'
|
||||
81 f8 a9 e4 40 ae f8 e1 8b b5 7d 25 49 26 38 f8 | '\x81\xf8\xa9\xe4@\xae\xf8\xe1\x8b\xb5}%I&8\xf8'
|
||||
a6 90 e4 05 7b 98 f9 06 39 a1 7b e2 c6 b9 a3 7b | '\xa6\x90\xe4\x05{\x98\xf9\x069\xa1{\xe2\xc6\xb9\xa3{'
|
||||
74 71 73 0c ac ac 7e 85 85 f2 37 f5 d0 3c ed 21 | 'tqs\x0c\xac\xac~\x85\x85\xf27\xf5\xd0<\xed!'
|
||||
00 d6 53 8b 2a 4a d3 9e 9c db b9 68 e2 83 ea 07 | '\x00\xd6S\x8b*J\xd3\x9e\x9c\xdb\xb9h\xe2\x83\xea\x07'
|
||||
af 0d 2e de 61 04 c0 29 56 47 92 7c 7d 54 47 f2 | '\xaf\r.\xdea\x04\xc0)VG\x92|}TG\xf2'
|
||||
1c 0e 90 19 11 4a a0 4f f6 f7 eb 00 63 4b 48 6e | '\x1c\x0e\x90\x19\x11J\xa0O\xf6\xf7\xeb\x00cKHn'
|
||||
b2 7f 4f 92 fb 71 49 7f 24 b3 2d 30 b5 61 5c 9f | '\xb2\x7fO\x92\xfbqI\x7f$\xb3-0\xb5a\\\x9f'
|
||||
39 fa 4f f6 ed f6 20 93 24 57 7a 62 26 49 b2 c2 | '9\xfaO\xf6\xed\xf6 \x93$Wzb&I\xb2\xc2'
|
||||
1f 27 49 32 cf d2 18 3d 75 64 92 bc eb 0d 35 a9 | "\x1f'I2\xcf\xd2\x18=ud\x92\xbc\xeb\r5\xa9"
|
||||
0d 81 00 58 74 ec e2 21 1f 52 fd 52 09 f2 ee 9a | '\r\x81\x00Xt\xec\xe2!\x1fR\xfdR\t\xf2\xee\x9a'
|
||||
d2 62 92 e4 7e cf 7c 52 d7 7b b5 74 e4 b1 a9 e9 | '\xd2b\x92\xe4~\xcf|R\xd7{\xb5t\xe4\xb1\xa9\xe9'
|
||||
f4 5d cb 83 6d 57 98 88 6a 99 ca ca ba ff cd aa | '\xf4]\xcb\x83mW\x98\x88j\x99\xca\xca\xba\xff\xcd\xaa'
|
||||
bf 9b 82 38 93 5e f7 92 0e 79 60 5c c5 e1 10 5d | '\xbf\x9b\x828\x93^\xf7\x92\x0ey`\\\xc5\xe1\x10]'
|
||||
91 2d d6 92 0c 43 3a 1f da 08 43 76 4e c0 a0 2a | '\x91-\xd6\x92\x0cC:\x1f\xda\x08CvN\xc0\xa0*'
|
||||
26 2f 00 fd 4b c9 de 88 24 c9 65 b8 af 3f 34 04 | '&/\x00\xfdK\xc9\xde\x88$\xc9e\xb8\xaf?4\x04'
|
||||
ab bd 15 99 0d e2 76 74 d4 7f 32 ee 7a 08 7f 92 | '\xab\xbd\x15\x99\r\xe2vt\xd4\x7f2\xeez\x08\x7f\x92'
|
||||
64 90 51 77 ac 21 c9 09 88 22 49 ae c0 91 d9 b8 | 'd\x90Qw\xac!\xc9\t\x88"I\xae\xc0\x91\xd9\xb8'
|
||||
40 ae c1 61 92 d4 f9 2a 4d c7 56 90 a4 d8 3f b3 | '@\xae\xc1a\x92\xd4\xf9*M\xc7V\x90\xa4\xd8?\xb3'
|
||||
c2 1e 93 64 7e 3b c5 bd f1 4a 58 44 15 52 6d af | '\xc2\x1e\x93d~;\xc5\xbd\xf1JXD\x15Rm\xaf'
|
||||
fa 4c aa db 59 a9 49 92 5a 4f e5 13 92 e4 84 9e | '\xfaL\xaa\xdbY\xa9I\x92ZO\xe5\x13\x92\xe4\x84\x9e'
|
||||
53 30 ea d2 8b fc ee 42 5f 15 76 50 e3 b3 9b 24 | 'S0\xea\xd2\x8b\xfc\xeeB_\x15vP\xe3\xb3\x9b$'
|
||||
fd 6d a6 0a 2f 48 96 8f c7 a6 70 05 af 00 e6 c5 | '\xfdm\xa6\n/H\x96\x8f\xc7\xa6p\x05\xaf\x00\xe6\xc5'
|
||||
a4 87 3d 13 4d 4c 2f 93 5c 85 f7 e2 1d 6a 7b 63 | '\xa4\x87=\x13ML/\x93\\\x85\xf7\xe2\x1dj{c'
|
||||
e3 3d 17 84 91 6e 50 66 93 0c c3 17 e9 e6 2f 63 | '\xe3=\x17\x84\x91nPf\x93\x0c\xc3\x17\xe9\xe6/c'
|
||||
84 ee 20 76 34 88 1b 8d 97 e2 87 62 04 5d c5 31 | '\x84\xee v4\x88\x1b\x8d\x97\xe2\x87b\x04]\xc51'
|
||||
92 8c 44 4a 7b 4c d1 70 17 fa 57 92 64 a5 95 ab | '\x92\x8cDJ{L\xd1p\x17\xfaW\x92d\xa5\x95\xab'
|
||||
36 cb bc ab 8e c9 d8 48 92 eb 10 81 b9 d5 2e f1 | '6\xcb\xbc\xab\x8e\xc9\xd8H\x92\xeb\x10\x81\xb9\xd5.\xf1'
|
||||
cc d4 e4 15 c9 49 58 ef 0f a7 80 1e f0 2d 4f c5 | '\xcc\xd4\xe4\x15\xc9IX\xef\x0f\xa7\x80\x1e\xf0-O\xc5'
|
||||
78 92 1c 2f 5d fb 1a 96 49 63 8d 89 d8 45 de c7 | 'x\x92\x1c/]\xfb\x1a\x96Ic\x8d\x89\xd8E\xde\xc7'
|
||||
0c be 75 56 a5 e5 41 95 4a d2 aa cf 72 64 91 a4 | '\x0c\xbeuV\xa5\xe5A\x95J\xd2\xaa\xcfrd\x91\xa4'
|
||||
d6 a5 fd 78 68 f6 23 0c fb 49 74 2b 70 36 be 4f | '\xd6\xa5\xfdxh\xf6#\x0c\xfbIt+p6\xbeO'
|
||||
92 da 27 d2 0f 5d c2 44 b2 a2 07 4e b1 ad 80 18 | "\x92\xda'\xd2\x0f]\xc2D\xb2\xa2\x07N\xb1\xad\x80\x18"
|
||||
92 5e 32 fd 78 ef 23 4f 65 a1 79 97 06 71 6f 60 | '\x92^2\xfdx\xef#Oe\xa1y\x97\x06qo`'
|
||||
8f f8 a1 08 41 4f b0 9d 24 17 21 35 cd 1b 63 1f | '\x8f\xf8\xa1\x08AO\xb0\x9d$\x17!5\xcd\x1bc\x1f'
|
||||
c9 dd c4 b1 7c 1b ab c9 45 b8 c1 74 2c ce ca 7c | '\xc9\xdd\xc4\xb1|\x1b\xab\xc9E\xb8\xc1t,\xce\xca|'
|
||||
30 01 1d 92 b0 aa fa 35 ee c8 ba ea 78 11 fd 0e | '0\x01\x1d\x92\xb0\xaa\xfa5\xee\xc8\xba\xeax\x11\xfd\x0e'
|
||||
62 b9 86 9c 8e f5 27 70 8e 24 63 c4 7f b8 0b d7 | "b\xb9\x86\x9c\x8e\xf5'p\x8e$c\xc4\x7f\xb8\x0b\xd7"
|
||||
c8 37 09 ef 49 26 62 1b b9 08 2f c8 eb 58 92 09 | '\xc87\t\xefI&b\x1b\xb9\x08/\xc8\xebX\x92\t'
|
||||
4c 23 35 18 b3 1d e2 24 17 89 49 c8 da 85 7b 16 | 'L#5\x18\xb3\x1d\xe2$\x17\x89I\xc8\xda\x85{\x16'
|
||||
7e a4 cc 37 0a 27 6a de 7c 98 2c 8b 64 aa 85 53 | "~\xa4\xcc7\n'j\xde|\x98,\x8bd\xaa\x85S"
|
||||
99 9d 97 6d 47 92 ae d6 fa 79 4a 18 4c 72 38 52 | '\x99\x9d\x97mG\x92\xae\xd6\xfayJ\x18Lr8R'
|
||||
1a c2 cd c2 24 e9 c9 c3 27 11 9b 49 72 0d 12 59 | "\x1a\xc2\xcd\xc2$\xe9\xc9\xc3'\x11\x9bIr\r\x12Y"
|
||||
d2 07 2a e3 57 e2 91 55 78 40 be 17 86 32 1f 32 | '\xd2\x07*\xe3W\xe2\x91Ux@\xbe\x17\x862\x1f2'
|
||||
00 e8 9d 96 04 6b 57 e7 80 8f 55 17 99 8d 83 a9 | '\x00\xe8\x9d\x96\x04kW\xe7\x80\x8fU\x17\x99\x8d\x83\xa9'
|
||||
76 36 e9 43 8c cb 49 56 d8 76 5c 85 4f 24 79 56 | 'v6\xe9C\x8c\xcbIV\xd8v\\\x85O$yV'
|
||||
ec 0d 4c 44 f7 ad 5d 00 0c cc e7 43 ec 22 bb 38 | '\xec\rLD\xf7\xad]\x00\x0c\xcc\xe7C\xec"\xbb8'
|
||||
68 5e fc b1 d9 d8 3d 05 96 b2 97 ac 44 d4 51 5c | 'h^\xfc\xb1\xd9\xd8=\x05\x96\xb2\x97\xacD\xd4Q\\'
|
||||
23 49 46 21 0c 1f 62 91 38 19 89 b4 73 56 05 d5 | '#IF!\x0c\x1fb\x918\x19\x89\xb4sV\x05\xd5'
|
||||
ba 79 3b 5f 8a f7 77 d4 ca 67 1e fe 22 15 ee d2 | '\xbay;_\x8a\xf7w\xd4\xcag\x1e\xfe"\x15\xee\xd2'
|
||||
91 a3 d8 5b fc e1 cb 51 fd ab fb c9 cc ec ee 21 | '\x91\xa3\xd8[\xfc\xe1\xcbQ\xfd\xab\xfb\xc9\xcc\xec\xee!'
|
||||
7d 70 6e f3 18 ce c1 c1 6d 8c 81 44 32 cf 51 ba | '}pn\xf3\x18\xce\xc1\xc1m\x8c\x81D2\xcfQ\xba'
|
||||
...>
|
||||
<crc [chunk CRC32] : 0xa9fbdd38>
|
||||
### PNGChunk ###
|
||||
<len [chunk length] : 0>
|
||||
<type [chunk type] : 'IEND'>
|
||||
<data [chunk data] : >
|
||||
<crc [chunk CRC32] : 0xae426082>
|
||||
```
|
||||
|
||||
It is possible to test the *pycrate_asn1compile.py* tool with some test ASN.1
|
||||
specification from *./test/res/*, or any other valid ASN.1 specification of your
|
||||
choice.
|
||||
|
||||
```console
|
||||
$ ./tools/pycrate_asn1compile.py --help
|
||||
usage: pycrate_asn1compile.py [-h] [-i INPUT [INPUT ...]] [-o OUTPUT]
|
||||
[-fautotags] [-fextimpl] [-fverifwarn]
|
||||
|
||||
compile ASN.1 input file(s) for the pycrate ASN.1 runtime
|
||||
|
||||
optional arguments:
|
||||
-h, --help show this help message and exit
|
||||
-i INPUT [INPUT ...] ASN.1 input file(s) or directory
|
||||
-o OUTPUT compiled output Python source file
|
||||
-fautotags force AUTOMATIC TAGS for all ASN.1 modules
|
||||
-fextimpl force EXTENSIBILITY IMPLIED for all ASN.1 modules
|
||||
-fverifwarn force warning instead of raising during the
|
||||
verification stage
|
||||
```
|
||||
|
||||
After compiling a module, it is possible to load it in Python and use it for
|
||||
encoding / decoding any objects defined in it.
|
||||
|
||||
```python
|
||||
Python 3.4.3 (default, Nov 17 2016, 01:08:31)
|
||||
[GCC 4.8.4] on linux
|
||||
Type "help", "copyright", "credits" or "license" for more information.
|
||||
>>> HardcoreSyntax # this is the only ASN.1 module provided in Hardcore.asn
|
||||
<class 'Hardcore.HardcoreSyntax'>
|
||||
>>> Final = HardcoreSyntax.Final # this is the Final object defined at line 115
|
||||
>>> Final
|
||||
<Final (SEQUENCE)>
|
||||
>>> Final.get_proto() # warning: this does not show optional or extended component
|
||||
{
|
||||
w1: {
|
||||
r10: {
|
||||
low: 'INTEGER',
|
||||
high: 'INTEGER',
|
||||
bool: 'BOOLEAN',
|
||||
null: 'NULL'
|
||||
},
|
||||
r90: {
|
||||
low: 'INTEGER',
|
||||
high: 'INTEGER',
|
||||
bool: 'BOOLEAN',
|
||||
null: 'NULL'
|
||||
}
|
||||
},
|
||||
w2: {
|
||||
r10: {
|
||||
low: 'INTEGER',
|
||||
high: 'INTEGER',
|
||||
bool: 'BOOLEAN',
|
||||
null: 'NULL'
|
||||
},
|
||||
r90: {
|
||||
low: 'INTEGER',
|
||||
high: 'INTEGER',
|
||||
bool: 'BOOLEAN',
|
||||
null: 'NULL'
|
||||
}
|
||||
},
|
||||
bool: 'BOOLEAN'
|
||||
}
|
||||
>>> V = { \
|
||||
... 'w1':{'r10':{'low':5, 'high':50, 'bool':False}, 'r90':{'low':50, 'high':95, 'bool':False, 'null':0}}, \
|
||||
... 'w2':{'r10':{'low':1, 'high':10, 'bool':False}, 'r90':{'low':90, 'high':100, 'bool':True}}, \
|
||||
... 'bool': True})
|
||||
>>> Final.set_val(V)
|
||||
>>> print(Final.to_asn1()) # .to_asn1() returns a printable ASN.1 representation of the value
|
||||
{
|
||||
w1 {
|
||||
r10 {
|
||||
low 5,
|
||||
high 50,
|
||||
bool FALSE
|
||||
},
|
||||
r90 {
|
||||
low 50,
|
||||
high 95,
|
||||
bool FALSE,
|
||||
null NULL
|
||||
}
|
||||
},
|
||||
w2 {
|
||||
r10 {
|
||||
low 1,
|
||||
high 10,
|
||||
bool FALSE
|
||||
},
|
||||
r90 {
|
||||
low 90,
|
||||
high 100,
|
||||
bool TRUE
|
||||
}
|
||||
},
|
||||
bool TRUE
|
||||
}
|
||||
>>> Final.to_aper() # aligned PER
|
||||
b'*\x85\x92\x80@\x01\x00\x08\x02\xd5`'
|
||||
>>> Final.to_uper() # unaligned PER
|
||||
b'*\x85\x92\x80@@\x02\x00\xb5X'
|
||||
>>> Final.to_ber()
|
||||
b'05\xa0\x18\xa0\t\x80\x01\x05\x81\x012\x82\x01\x00\xa1\x0b\x80\x012\x81\x01_\x82\x01\x00\x83\x00\xa1\x16\xa0\t\x80\x01\x01\x81\x01\n\x82\x01\x00\xa1\t\x80\x01Z\x81\x01d\x82\x01\xff\x82\x01\xff'
|
||||
>>> Final.to_cer()
|
||||
b'0\x80\xa0\x80\xa0\x80\x80\x01\x05\x81\x012\x82\x01\x00\x00\x00\xa1\x80\x80\x012\x81\x01_\x82\x01\x00\x83\x00\x00\x00\x00\x00\xa1\x80\xa0\x80\x80\x01\x01\x81\x01\n\x82\x01\x00\x00\x00\xa1\x80\x80\x01Z\x81\x01d\x82\x01\xff\x00\x00\x00\x00\x82\x01\xff\x00\x00'
|
||||
>>> Final.to_der()
|
||||
b'05\xa0\x18\xa0\t\x80\x01\x05\x81\x012\x82\x01\x00\xa1\x0b\x80\x012\x81\x01_\x82\x01\x00\x83\x00\xa1\x16\xa0\t\x80\x01\x01\x81\x01\n\x82\x01\x00\xa1\t\x80\x01Z\x81\x01d\x82\x01\xff\x82\x01\xff'
|
||||
>>> Final.from_ber( Final.to_ber() )
|
||||
>>> Final() == V # or Final._val == V
|
||||
True
|
||||
```
|
||||
|
||||
For more information about the API exposed for each ASN.1 object, you can check
|
||||
the docstrings of all ASN.1 objects, and also read the source file *./pycrate_asn1rt/asnobj.py*.
|
||||
|
||||
|
|
@ -0,0 +1,280 @@
|
|||
GNU GENERAL PUBLIC LICENSE
|
||||
Version 2, June 1991
|
||||
|
||||
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
|
||||
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
Everyone is permitted to copy and distribute verbatim copies
|
||||
of this license document, but changing it is not allowed.
|
||||
|
||||
Preamble
|
||||
|
||||
The licenses for most software are designed to take away your
|
||||
freedom to share and change it. By contrast, the GNU General Public
|
||||
License is intended to guarantee your freedom to share and change free
|
||||
software--to make sure the software is free for all its users. This
|
||||
General Public License applies to most of the Free Software
|
||||
Foundation's software and to any other program whose authors commit to
|
||||
using it. (Some other Free Software Foundation software is covered by
|
||||
the GNU Lesser General Public License instead.) You can apply it to
|
||||
your programs, too.
|
||||
|
||||
When we speak of free software, we are referring to freedom, not
|
||||
price. Our General Public Licenses are designed to make sure that you
|
||||
have the freedom to distribute copies of free software (and charge for
|
||||
this service if you wish), that you receive source code or can get it
|
||||
if you want it, that you can change the software or use pieces of it
|
||||
in new free programs; and that you know you can do these things.
|
||||
|
||||
To protect your rights, we need to make restrictions that forbid
|
||||
anyone to deny you these rights or to ask you to surrender the rights.
|
||||
These restrictions translate to certain responsibilities for you if you
|
||||
distribute copies of the software, or if you modify it.
|
||||
|
||||
For example, if you distribute copies of such a program, whether
|
||||
gratis or for a fee, you must give the recipients all the rights that
|
||||
you have. You must make sure that they, too, receive or can get the
|
||||
source code. And you must show them these terms so they know their
|
||||
rights.
|
||||
|
||||
We protect your rights with two steps: (1) copyright the software, and
|
||||
(2) offer you this license which gives you legal permission to copy,
|
||||
distribute and/or modify the software.
|
||||
|
||||
Also, for each author's protection and ours, we want to make certain
|
||||
that everyone understands that there is no warranty for this free
|
||||
software. If the software is modified by someone else and passed on, we
|
||||
want its recipients to know that what they have is not the original, so
|
||||
that any problems introduced by others will not reflect on the original
|
||||
authors' reputations.
|
||||
|
||||
Finally, any free program is threatened constantly by software
|
||||
patents. We wish to avoid the danger that redistributors of a free
|
||||
program will individually obtain patent licenses, in effect making the
|
||||
program proprietary. To prevent this, we have made it clear that any
|
||||
patent must be licensed for everyone's free use or not licensed at all.
|
||||
|
||||
The precise terms and conditions for copying, distribution and
|
||||
modification follow.
|
||||
|
||||
GNU GENERAL PUBLIC LICENSE
|
||||
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
|
||||
|
||||
0. This License applies to any program or other work which contains
|
||||
a notice placed by the copyright holder saying it may be distributed
|
||||
under the terms of this General Public License. The "Program", below,
|
||||
refers to any such program or work, and a "work based on the Program"
|
||||
means either the Program or any derivative work under copyright law:
|
||||
that is to say, a work containing the Program or a portion of it,
|
||||
either verbatim or with modifications and/or translated into another
|
||||
language. (Hereinafter, translation is included without limitation in
|
||||
the term "modification".) Each licensee is addressed as "you".
|
||||
|
||||
Activities other than copying, distribution and modification are not
|
||||
covered by this License; they are outside its scope. The act of
|
||||
running the Program is not restricted, and the output from the Program
|
||||
is covered only if its contents constitute a work based on the
|
||||
Program (independent of having been made by running the Program).
|
||||
Whether that is true depends on what the Program does.
|
||||
|
||||
1. You may copy and distribute verbatim copies of the Program's
|
||||
source code as you receive it, in any medium, provided that you
|
||||
conspicuously and appropriately publish on each copy an appropriate
|
||||
copyright notice and disclaimer of warranty; keep intact all the
|
||||
notices that refer to this License and to the absence of any warranty;
|
||||
and give any other recipients of the Program a copy of this License
|
||||
along with the Program.
|
||||
|
||||
You may charge a fee for the physical act of transferring a copy, and
|
||||
you may at your option offer warranty protection in exchange for a fee.
|
||||
|
||||
2. You may modify your copy or copies of the Program or any portion
|
||||
of it, thus forming a work based on the Program, and copy and
|
||||
distribute such modifications or work under the terms of Section 1
|
||||
above, provided that you also meet all of these conditions:
|
||||
|
||||
a) You must cause the modified files to carry prominent notices
|
||||
stating that you changed the files and the date of any change.
|
||||
|
||||
b) You must cause any work that you distribute or publish, that in
|
||||
whole or in part contains or is derived from the Program or any
|
||||
part thereof, to be licensed as a whole at no charge to all third
|
||||
parties under the terms of this License.
|
||||
|
||||
c) If the modified program normally reads commands interactively
|
||||
when run, you must cause it, when started running for such
|
||||
interactive use in the most ordinary way, to print or display an
|
||||
announcement including an appropriate copyright notice and a
|
||||
notice that there is no warranty (or else, saying that you provide
|
||||
a warranty) and that users may redistribute the program under
|
||||
these conditions, and telling the user how to view a copy of this
|
||||
License. (Exception: if the Program itself is interactive but
|
||||
does not normally print such an announcement, your work based on
|
||||
the Program is not required to print an announcement.)
|
||||
|
||||
These requirements apply to the modified work as a whole. If
|
||||
identifiable sections of that work are not derived from the Program,
|
||||
and can be reasonably considered independent and separate works in
|
||||
themselves, then this License, and its terms, do not apply to those
|
||||
sections when you distribute them as separate works. But when you
|
||||
distribute the same sections as part of a whole which is a work based
|
||||
on the Program, the distribution of the whole must be on the terms of
|
||||
this License, whose permissions for other licensees extend to the
|
||||
entire whole, and thus to each and every part regardless of who wrote it.
|
||||
|
||||
Thus, it is not the intent of this section to claim rights or contest
|
||||
your rights to work written entirely by you; rather, the intent is to
|
||||
exercise the right to control the distribution of derivative or
|
||||
collective works based on the Program.
|
||||
|
||||
In addition, mere aggregation of another work not based on the Program
|
||||
with the Program (or with a work based on the Program) on a volume of
|
||||
a storage or distribution medium does not bring the other work under
|
||||
the scope of this License.
|
||||
|
||||
3. You may copy and distribute the Program (or a work based on it,
|
||||
under Section 2) in object code or executable form under the terms of
|
||||
Sections 1 and 2 above provided that you also do one of the following:
|
||||
|
||||
a) Accompany it with the complete corresponding machine-readable
|
||||
source code, which must be distributed under the terms of Sections
|
||||
1 and 2 above on a medium customarily used for software interchange; or,
|
||||
|
||||
b) Accompany it with a written offer, valid for at least three
|
||||
years, to give any third party, for a charge no more than your
|
||||
cost of physically performing source distribution, a complete
|
||||
machine-readable copy of the corresponding source code, to be
|
||||
distributed under the terms of Sections 1 and 2 above on a medium
|
||||
customarily used for software interchange; or,
|
||||
|
||||
c) Accompany it with the information you received as to the offer
|
||||
to distribute corresponding source code. (This alternative is
|
||||
allowed only for noncommercial distribution and only if you
|
||||
received the program in object code or executable form with such
|
||||
an offer, in accord with Subsection b above.)
|
||||
|
||||
The source code for a work means the preferred form of the work for
|
||||
making modifications to it. For an executable work, complete source
|
||||
code means all the source code for all modules it contains, plus any
|
||||
associated interface definition files, plus the scripts used to
|
||||
control compilation and installation of the executable. However, as a
|
||||
special exception, the source code distributed need not include
|
||||
anything that is normally distributed (in either source or binary
|
||||
form) with the major components (compiler, kernel, and so on) of the
|
||||
operating system on which the executable runs, unless that component
|
||||
itself accompanies the executable.
|
||||
|
||||
If distribution of executable or object code is made by offering
|
||||
access to copy from a designated place, then offering equivalent
|
||||
access to copy the source code from the same place counts as
|
||||
distribution of the source code, even though third parties are not
|
||||
compelled to copy the source along with the object code.
|
||||
|
||||
4. You may not copy, modify, sublicense, or distribute the Program
|
||||
except as expressly provided under this License. Any attempt
|
||||
otherwise to copy, modify, sublicense or distribute the Program is
|
||||
void, and will automatically terminate your rights under this License.
|
||||
However, parties who have received copies, or rights, from you under
|
||||
this License will not have their licenses terminated so long as such
|
||||
parties remain in full compliance.
|
||||
|
||||
5. You are not required to accept this License, since you have not
|
||||
signed it. However, nothing else grants you permission to modify or
|
||||
distribute the Program or its derivative works. These actions are
|
||||
prohibited by law if you do not accept this License. Therefore, by
|
||||
modifying or distributing the Program (or any work based on the
|
||||
Program), you indicate your acceptance of this License to do so, and
|
||||
all its terms and conditions for copying, distributing or modifying
|
||||
the Program or works based on it.
|
||||
|
||||
6. Each time you redistribute the Program (or any work based on the
|
||||
Program), the recipient automatically receives a license from the
|
||||
original licensor to copy, distribute or modify the Program subject to
|
||||
these terms and conditions. You may not impose any further
|
||||
restrictions on the recipients' exercise of the rights granted herein.
|
||||
You are not responsible for enforcing compliance by third parties to
|
||||
this License.
|
||||
|
||||
7. If, as a consequence of a court judgment or allegation of patent
|
||||
infringement or for any other reason (not limited to patent issues),
|
||||
conditions are imposed on you (whether by court order, agreement or
|
||||
otherwise) that contradict the conditions of this License, they do not
|
||||
excuse you from the conditions of this License. If you cannot
|
||||
distribute so as to satisfy simultaneously your obligations under this
|
||||
License and any other pertinent obligations, then as a consequence you
|
||||
may not distribute the Program at all. For example, if a patent
|
||||
license would not permit royalty-free redistribution of the Program by
|
||||
all those who receive copies directly or indirectly through you, then
|
||||
the only way you could satisfy both it and this License would be to
|
||||
refrain entirely from distribution of the Program.
|
||||
|
||||
If any portion of this section is held invalid or unenforceable under
|
||||
any particular circumstance, the balance of the section is intended to
|
||||
apply and the section as a whole is intended to apply in other
|
||||
circumstances.
|
||||
|
||||
It is not the purpose of this section to induce you to infringe any
|
||||
patents or other property right claims or to contest validity of any
|
||||
such claims; this section has the sole purpose of protecting the
|
||||
integrity of the free software distribution system, which is
|
||||
implemented by public license practices. Many people have made
|
||||
generous contributions to the wide range of software distributed
|
||||
through that system in reliance on consistent application of that
|
||||
system; it is up to the author/donor to decide if he or she is willing
|
||||
to distribute software through any other system and a licensee cannot
|
||||
impose that choice.
|
||||
|
||||
This section is intended to make thoroughly clear what is believed to
|
||||
be a consequence of the rest of this License.
|
||||
|
||||
8. If the distribution and/or use of the Program is restricted in
|
||||
certain countries either by patents or by copyrighted interfaces, the
|
||||
original copyright holder who places the Program under this License
|
||||
may add an explicit geographical distribution limitation excluding
|
||||
those countries, so that distribution is permitted only in or among
|
||||
countries not thus excluded. In such case, this License incorporates
|
||||
the limitation as if written in the body of this License.
|
||||
|
||||
9. The Free Software Foundation may publish revised and/or new versions
|
||||
of the General Public License from time to time. Such new versions will
|
||||
be similar in spirit to the present version, but may differ in detail to
|
||||
address new problems or concerns.
|
||||
|
||||
Each version is given a distinguishing version number. If the Program
|
||||
specifies a version number of this License which applies to it and "any
|
||||
later version", you have the option of following the terms and conditions
|
||||
either of that version or of any later version published by the Free
|
||||
Software Foundation. If the Program does not specify a version number of
|
||||
this License, you may choose any version ever published by the Free Software
|
||||
Foundation.
|
||||
|
||||
10. If you wish to incorporate parts of the Program into other free
|
||||
programs whose distribution conditions are different, write to the author
|
||||
to ask for permission. For software which is copyrighted by the Free
|
||||
Software Foundation, write to the Free Software Foundation; we sometimes
|
||||
make exceptions for this. Our decision will be guided by the two goals
|
||||
of preserving the free status of all derivatives of our free software and
|
||||
of promoting the sharing and reuse of software generally.
|
||||
|
||||
NO WARRANTY
|
||||
|
||||
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
|
||||
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
|
||||
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
|
||||
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
|
||||
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
|
||||
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
|
||||
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
|
||||
REPAIR OR CORRECTION.
|
||||
|
||||
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
|
||||
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
|
||||
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
|
||||
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
|
||||
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
|
||||
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
|
||||
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
|
||||
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGES.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
Loading…
Reference in New Issue