.chg file format of MONOMAKH-SAPR: Python parsing library

CHG is a container format file used by MONOMAKH-SAPR, a software package for analysis & design of reinforced concrete multi-storey buildings with arbitrary configuration in plan.

CHG is a simple container, which bundles several project files together.

Written and tested by Vladimir Shulzhitskiy, 2017

Application

MONOMAKH-SAPR

File extension

chg

KS implementation details

License: CC0-1.0
Minimal Kaitai Struct required: 0.7

This page hosts a formal specification of .chg file format of MONOMAKH-SAPR using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

Usage

Parse a local file and get structure in memory:

data = MonomakhSaprChg.from_file("path/to/local/file.chg")

Or parse structure from a bytes:

from kaitaistruct import KaitaiStream, BytesIO

raw = b"\x00\x01\x02..."
data = MonomakhSaprChg(KaitaiStream(BytesIO(raw)))

After that, one can get various attributes from the structure by invoking getter methods like:

data.title # => get title

Python source code to parse .chg file format of MONOMAKH-SAPR

monomakh_sapr_chg.py

# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild

from pkg_resources import parse_version
from kaitaistruct import __version__ as ks_version, KaitaiStruct, KaitaiStream, BytesIO


if parse_version(ks_version) < parse_version('0.7'):
    raise Exception("Incompatible Kaitai Struct Python API: 0.7 or later is required, but you have %s" % (ks_version))

class MonomakhSaprChg(KaitaiStruct):
    """CHG is a container format file used by
    [MONOMAKH-SAPR](https://www.liraland.com/mono/index.php), a software
    package for analysis & design of reinforced concrete multi-storey
    buildings with arbitrary configuration in plan.
    
    CHG is a simple container, which bundles several project files
    together.
    
    Written and tested by Vladimir Shulzhitskiy, 2017
    """
    def __init__(self, _io, _parent=None, _root=None):
        self._io = _io
        self._parent = _parent
        self._root = _root if _root else self
        self._read()

    def _read(self):
        self.title = (self._io.read_bytes(10)).decode(u"ascii")
        self.ent = []
        i = 0
        while not self._io.is_eof():
            self.ent.append(self._root.Block(self._io, self, self._root))
            i += 1


    class Block(KaitaiStruct):
        def __init__(self, _io, _parent=None, _root=None):
            self._io = _io
            self._parent = _parent
            self._root = _root if _root else self
            self._read()

        def _read(self):
            self.header = (self._io.read_bytes(13)).decode(u"ascii")
            self.file_size = self._io.read_u8le()
            self.file = self._io.read_bytes(self.file_size)