version 2.8

Makefile

@@ -8,11 +8,12 @@ ext:
 	python setup.py build_ext --inplace
 
 test:
+	python setup.py build_ext --inplace
 	python -m pytest tests
 
 clean:
-	find pyModeS/decoder -type f -name '*.c' -delete
-	find pyModeS/decoder -type f -name '*.so' -delete
+	find pyModeS -type f -name '*.c' -delete
+	find pyModeS -type f -name '*.so' -delete
 	find . | grep -E "(__pycache__|\.pyc|\.pyo$$)" | xargs rm -rf
 	rm -rf *.egg-info
 	rm -rf .pytest_cache

pyModeS/__init__.py

@@ -5,8 +5,8 @@ try:
     from . import c_common as common
     from .c_common import *
 except:
-    from . import common
-    from .common import *
+    from . import py_common as common
+    from .py_common import *
 
 from .decoder import tell
 from .decoder import adsb

pyModeS/c_common.pxd

@@ -5,7 +5,8 @@ cdef unsigned char int_to_char(unsigned char i)
 
 cpdef str hex2bin(str hexstr)
 cpdef long bin2int(str binstr)
-cpdef long hex2int(str binstr)
+cpdef long hex2int(str hexstr)
+cpdef str bin2hex(str binstr)
 
 cpdef unsigned char df(str msg)
 cpdef long crc(str msg, bint encode=*)

pyModeS/c_common.pyx

@@ -66,6 +66,11 @@ cpdef long hex2int(str hexstr):
         cumul = 16*cumul + char_to_int(v_hexstr[i])
     return cumul
 
+@cython.boundscheck(False)
+cpdef str bin2hex(str binstr):
+    return "{0:X}".format(int(binstr, 2))
+
+
 @cython.boundscheck(False)
 cpdef unsigned char df(str msg):
     """Decode Downlink Format vaule, bits 1 to 5."""

pyModeS/encoder/__init__.py

@@ -1,68 +0,0 @@
-from .bds.bds08 import me08
-from .bds.bds09 import me09
-from pyModeS import common
-
-
-def encode_adsb(**kwargs):
-    """Encode ADS-B message.
-
-    Args:
-        icao (string): Transponder ICAO address (6 hexdigits)
-        capability (int): Transponder capability, between 0 and 7
-        typecode (int): Typecode, less than 32
-
-        callsign (string): Callsign (6 hexdigits)
-        category (int): Aircraft category, between 0 and 7, Default to 0.
-
-        speed (int): Speed in knots.
-        angle (float): Track angle or heading angle in degrees.
-        vertical_rate (int): vertical rate in feet/minute
-        intent_change (int): Intent change flag, 0 or 1. Default to 0.
-        ifr_capability (int): IFR capability flag, 0 or 1. Default to 1.
-        navigation_quality (int): NUC (ver 0) or NACv (ver 1, 2), between 0 and 7.
-            Default to 0.
-        supersonic (bool): Is this a supersonic flight? Default to False.
-        speed_type (str): Speed type: GS, IAS, or TAS. Default to GS.
-        vertical_rate_source (str): GNSS or BARO. Default to BARO.
-        gnss_baro_alt_diff (int): Different between GNSS and barometric altitude in feet.
-            Negative value indicates GNSS altitude below barometric altitude. Default to 0
-
-    Returns:
-        string: 28 hexdigits raw message
-
-    """
-    tc = kwargs.get("typecode")
-
-    if 1 <= tc <= 4:
-        me = me08(**kwargs)
-    elif tc == 19:
-        me = me09(**kwargs)
-
-    msg = _constuct(**dict(kwargs, me=me))
-    return msg
-
-
-def _constuct(**kwargs):
-    icao = kwargs.get("icao")
-    me = kwargs.get("me")
-    capability = kwargs.get("capability", 6)
-
-    if icao is None or len(icao) != 6:
-        raise Exception("Transponder address must be 6 hexadecimal characters.")
-
-    if me is None or len(me) != 14:
-        raise Exception("Message be 14 hexadecimal characters.")
-
-    if capability > 6:
-        raise Exception("Transponder capability must be smaller than 7.")
-
-    header_bin = "10001" + "{0:03b}".format(capability)
-    header_hex = "{0:02X}".format(int(header_bin, 2))
-
-    msg = header_hex + icao + me + "000000"
-
-    pi = common.crc(msg, encode=True)
-    pi_hex = "{0:06X}".format(pi)
-
-    msg = msg[:-6] + pi_hex
-    return msg

pyModeS/encoder/bds/bds05.py

@@ -1,5 +0,0 @@
-# ------------------------------------------
-#   BDS 0,5
-#   ADS-B TC=9-18
-#   Airborn position
-# ------------------------------------------

pyModeS/encoder/bds/bds06.py

@@ -1,5 +0,0 @@
-# ------------------------------------------
-#   BDS 0,6
-#   ADS-B TC=5-8
-#   Surface position
-# ------------------------------------------

pyModeS/encoder/bds/bds08.py

@@ -1,40 +0,0 @@
-# ------------------------------------------
-#   BDS 0,8
-#   ADS-B TC=1-4
-#   Aircraft identitification and category
-# ------------------------------------------
-
-from pyModeS import common
-
-charmap = "#ABCDEFGHIJKLMNOPQRSTUVWXYZ##### ###############0123456789######"
-
-
-def me08(callsign, **kwargs):
-    cs = callsign
-    tc = kwargs.get("typecode")
-    cat = kwargs.get("category", 0)
-
-    if len(cs) > 8:
-        raise Exception("callsign must contain less than 9 characters")
-
-    if tc > 4:
-        raise Exception("typecode must be less 5")
-
-    if cat > 7:
-        raise Exception("category must be less 8")
-
-    if not cs.isalnum():
-        raise Exception("callsign must only contain alphanumeric characters")
-
-    cs = "{:<8}".format(cs.upper())
-
-    idx = [charmap.index(c) for c in cs]
-    me_bin = (
-        "{0:05b}".format(tc)
-        + "{0:03b}".format(cat)
-        + "".join("{0:06b}".format(i) for i in idx)
-    )
-
-    me_hex = "{0:04X}".format(int(me_bin, 2))
-
-    return me_hex

pyModeS/encoder/bds/bds09.py

@@ -1,119 +0,0 @@
-# ------------------------------------------
-#   BDS 0,9
-#   ADS-B TC=19
-#   Aircraft Airborn velocity
-# ------------------------------------------
-
-import numpy as np
-
-
-def me09(speed, angle, vertical_rate, **kwargs):
-    spd = speed
-    agl = angle
-    vr = vertical_rate
-
-    tc = kwargs.get("typecode")
-    intent = kwargs.get("intent_change", 0)
-    ifr = kwargs.get("ifr_capability", 1)
-    navq = kwargs.get("navigation_quality", 0)
-    supersonic = kwargs.get("supersonic", False)
-    spd_type = kwargs.get("speed_type", "gs").lower()
-    vr_source = kwargs.get("vertical_rate_source", "baro").lower()
-    alt_diff = kwargs.get("gnss_baro_alt_diff", 0)
-
-    if tc != 19:
-        raise Exception("Typecode must be 19.")
-
-    if intent not in (0, 1):
-        raise Exception("Intent change flag must be 0 or 1.")
-
-    if ifr not in (0, 1):
-        raise Exception("IFR capability flag must be 0 or 1.")
-
-    if type(supersonic) != bool:
-        raise Exception("Subsonic flag must be True or False.")
-
-    if navq > 7:
-        raise Exception("Navigation quality indicator must be smaller than 8.")
-
-    if spd_type not in ["gs", "tas"]:
-        raise Exception("Speed type must be 'gs', 'ias', or 'tas'.")
-
-    if vr_source not in ["baro", "gnss"]:
-        raise Exception("Vertical rate source must be 'baro' or 'gnss'.")
-
-    me_bin = ""
-
-    # typecode
-    me_bin += "{0:05b}".format(tc)
-
-    # sub-type
-    if supersonic:
-        if spd_type == "gs":
-            me_bin += "010"
-        else:
-            me_bin += "100"
-    else:
-        if spd_type == "gs":
-            me_bin += "001"
-        else:
-            me_bin += "011"
-
-    # intent, ifr, navigation quality
-    me_bin += str(intent) + str(ifr) + "{0:03b}".format(navq)
-
-    # speed and angle part
-    if spd_type == "gs":
-        vx = spd * np.sin(np.radians(agl))
-        vy = spd * np.cos(np.radians(agl))
-
-        if supersonic:
-            vx /= 4
-            vy /= 4
-
-        vx = int(round(vx))
-        vy = int(round(vy))
-
-        sew = "0" if vx >= 0 else "1"
-        sns = "0" if vy >= 0 else "1"
-        vew = "{0:010b}".format(min(abs(vx), 1023) + 1)
-        vns = "{0:010b}".format(min(abs(vy), 1023) + 1)
-
-        me_bin += sew + vew + sns + vns
-
-    elif spd_type == "ias" or spd_type == "tas":
-        hdg = int(round(agl * 1024 / 360))
-        hdg = min(hdg, 1023)
-
-        air_type = "1" if spd_type == "tas" else "0"
-
-        if supersonic:
-            spd /= 4
-
-        spd = min(int(round(spd)), 1023)
-
-        me_bin += "1" + "{0:010b}".format(hdg) + air_type + "{0:010b}".format(spd)
-
-    # vertical rate source
-    me_bin += "1" if vr_source == "baro" else "0"
-
-    # vertical rate
-    me_bin += "0" if vr > 0 else "1"
-    vr = int(round((abs(vr) / 64 + 1)))
-    vr = min(vr, 511)
-    me_bin += "{0:09b}".format(vr)
-
-    # reserved
-    me_bin += "00"
-
-    # altitude difference
-    me_bin += "1" if alt_diff < 0 else "0"
-    alt_diff = int(round(abs(alt_diff) / 25 + 1))
-    alt_diff = min(alt_diff, 127)
-    me_bin += "{0:07b}".format(alt_diff)
-    print(me_bin)
-
-    # convert to hexdigits
-    me_hex = "{0:04X}".format(int(me_bin, 2))
-
-    return me_hex

pyModeS/py_common.py

@@ -19,6 +19,11 @@ def bin2int(binstr):
     return int(binstr, 2)
 
 
+def bin2hex(binstr):
+    """Convert a binary string to hexdecimal string."""
+    return "{0:X}".format(int(binstr, 2))
+
+
 def df(msg):
     """Decode Downlink Format value, bits 1 to 5."""
     dfbin = hex2bin(msg[:2])

setup.py

@@ -8,20 +8,12 @@ Steps for deploying a new version:
 1. Increase the version number
 2. remove the old deployment under [dist] and [build] folder
 3. run: python setup.py sdist
-   run: python setup.py bdist_wheel --universal
 4. twine upload dist/*
 """
 
 # Always prefer setuptools over distutils
 from setuptools import setup, find_packages
 
-# Compile some parts
-from setuptools.extension import Extension
-from Cython.Build import cythonize
-
-extensions = [Extension("pyModeS.c_common", ["pyModeS/c_common.pyx"])]
-
-
 # To use a consistent encoding
 from codecs import open
 from os import path
@@ -32,78 +24,37 @@ here = path.abspath(path.dirname(__file__))
 with open(path.join(here, "README.rst"), encoding="utf-8") as f:
     long_description = f.read()
 
-setup(
+
+details = dict(
     name="pyModeS",
-    # Versions should comply with PEP440.  For a discussion on single-sourcing
-    # the version across setup.py and the project code, see
-    # https://packaging.python.org/en/latest/single_source_version.html
-    version="2.5",
+    version="2.8",
     description="Python Mode-S and ADS-B Decoder",
     long_description=long_description,
-    # The project's main homepage.
     url="https://github.com/junzis/pyModeS",
-    # Author details
     author="Junzi Sun",
     author_email="j.sun-1@tudelft.nl",
-    # Choose your license
     license="GNU GPL v3",
-    # See https://pypi.python.org/pypi?%3Aaction=list_classifiers
     classifiers=[
-        # How mature is this project? Common values are
-        #   3 - Alpha
-        #   4 - Beta
-        #   5 - Production/Stable
         "Development Status :: 4 - Beta",
-        # Indicate who your project is intended for
         "Intended Audience :: Developers",
         "Topic :: Software Development :: Libraries",
-        # Pick your license as you wish (should match "license" above)
         "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
-        # Specify the Python versions you support here. In particular, ensure
-        # that you indicate whether you support Python 2, Python 3 or both.
-        # "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 3",
     ],
-    ext_modules=cythonize(extensions),
-    # What does your project relate to?
     keywords="Mode-S ADS-B EHS ELS Comm-B",
-    # You can just specify the packages manually here if your project is
-    # simple. Or you can use find_packages().
     packages=find_packages(exclude=["contrib", "docs", "tests"]),
-    # Alternatively, if you want to distribute just a my_module.py, uncomment
-    # this:
-    #   py_modules=["my_module"],
-    # List run-time dependencies here.  These will be installed by pip when
-    # your project is installed. For an analysis of "install_requires" vs pip's
-    # requirements files see:
-    # https://packaging.python.org/en/latest/requirements.html
     install_requires=["numpy", "pyzmq", "pyrtlsdr"],
-    # List additional groups of dependencies here (e.g. development
-    # dependencies). You can install these using the following syntax,
-    # for example:
-    # $ pip install -e .[dev,test]
-    # extras_require={
-    #     'dev': ['check-manifest'],
-    #     'test': ['coverage'],
-    # },
-    # If there are data files included in your packages that need to be
-    # installed, specify them here.  If using Python 2.6 or less, then these
-    # have to be included in MANIFEST.in as well.
-    # package_data={
-    #     'sample': ['package_data.dat'],
-    # },
-    # Although 'package_data' is the preferred approach, in some case you may
-    # need to place data files outside of your packages. See:
-    # http://docs.python.org/3.4/distutils/setupscript.html#installing-additional-files # noqa
-    # In this case, 'data_file' will be installed into '<sys.prefix>/my_data'
-    # data_files=[('my_data', ['data/data_file'])],
-    # To provide executable scripts, use entry points in preference to the
-    # "scripts" keyword. Entry points provide cross-platform support and allow
-    # pip to create the appropriate form of executable for the target platform.
-    # entry_points={
-    #     'console_scripts': [
-    #         'sample=sample:main',
-    #     ],
-    # },
+    package_data={"pyModeS": ["*.pyx", "*.pxd"]},
     scripts=["pyModeS/streamer/modeslive"],
 )
+
+try:
+    from setuptools.extension import Extension
+    from Cython.Build import cythonize
+
+    extensions = [Extension("pyModeS.c_common", ["pyModeS/c_common.pyx"])]
+
+    setup(**dict(details, ext_modules=cythonize(extensions)))
+
+except:
+    setup(**details)

tests/test_c_common.py

@@ -1,58 +1,62 @@
-try:
-    from pyModeS.decoder import c_common as common
-
-    def test_conversions():
-        assert common.hex2bin("6E406B") == "011011100100000001101011"
-
-    def test_crc_decode():
-
-        assert common.crc("8D406B902015A678D4D220AA4BDA") == 0
-        assert common.crc("8d8960ed58bf053cf11bc5932b7d") == 0
-        assert common.crc("8d45cab390c39509496ca9a32912") == 0
-        assert common.crc("8d74802958c904e6ef4ba0184d5c") == 0
-        assert common.crc("8d4400cd9b0000b4f87000e71a10") == 0
-        assert common.crc("8d4065de58a1054a7ef0218e226a") == 0
-
-        assert common.crc("c80b2dca34aa21dd821a04cb64d4") == 10719924
-        assert common.crc("a800089d8094e33a6004e4b8a522") == 4805588
-        assert common.crc("a8000614a50b6d32bed000bbe0ed") == 5659991
-        assert common.crc("a0000410bc900010a40000f5f477") == 11727682
-        assert common.crc("8d4ca251204994b1c36e60a5343d") == 16
-        assert common.crc("b0001718c65632b0a82040715b65") == 353333
-
-    def test_crc_encode():
-        parity = common.crc("8D406B902015A678D4D220AA4BDA", encode=True)
-        assert parity == 11160538
-
-    def test_icao():
-        assert common.icao("8D406B902015A678D4D220AA4BDA") == "406B90"
-        assert common.icao("A0001839CA3800315800007448D9") == "400940"
-        assert common.icao("A000139381951536E024D4CCF6B5") == "3C4DD2"
-        assert common.icao("A000029CFFBAA11E2004727281F1") == "4243D0"
-
-    def test_modes_altcode():
-        assert common.altcode("A02014B400000000000000F9D514") == 32300
-
-    def test_modes_idcode():
-        assert common.idcode("A800292DFFBBA9383FFCEB903D01") == "1346"
-
-    def test_graycode_to_altitude():
-        assert common.gray2alt("00000000010") == -1000
-        assert common.gray2alt("00000001010") == -500
-        assert common.gray2alt("00000011011") == -100
-        assert common.gray2alt("00000011010") == 0
-        assert common.gray2alt("00000011110") == 100
-        assert common.gray2alt("00000010011") == 600
-        assert common.gray2alt("00000110010") == 1000
-        assert common.gray2alt("00001001001") == 5800
-        assert common.gray2alt("00011100100") == 10300
-        assert common.gray2alt("01100011010") == 32000
-        assert common.gray2alt("01110000100") == 46300
-        assert common.gray2alt("01010101100") == 50200
-        assert common.gray2alt("11011110100") == 73200
-        assert common.gray2alt("10000000011") == 126600
-        assert common.gray2alt("10000000001") == 126700
+from pyModeS import c_common
 
 
-except:
-    pass
+def test_conversions():
+    assert c_common.hex2bin("6E") == "01101110"
+    assert c_common.bin2hex("01101110") == "6E"
+    assert c_common.bin2hex("1101110") == "6E"
+
+
+def test_crc_decode():
+
+    assert c_common.crc("8D406B902015A678D4D220AA4BDA") == 0
+    assert c_common.crc("8d8960ed58bf053cf11bc5932b7d") == 0
+    assert c_common.crc("8d45cab390c39509496ca9a32912") == 0
+    assert c_common.crc("8d74802958c904e6ef4ba0184d5c") == 0
+    assert c_common.crc("8d4400cd9b0000b4f87000e71a10") == 0
+    assert c_common.crc("8d4065de58a1054a7ef0218e226a") == 0
+
+    assert c_common.crc("c80b2dca34aa21dd821a04cb64d4") == 10719924
+    assert c_common.crc("a800089d8094e33a6004e4b8a522") == 4805588
+    assert c_common.crc("a8000614a50b6d32bed000bbe0ed") == 5659991
+    assert c_common.crc("a0000410bc900010a40000f5f477") == 11727682
+    assert c_common.crc("8d4ca251204994b1c36e60a5343d") == 16
+    assert c_common.crc("b0001718c65632b0a82040715b65") == 353333
+
+
+def test_crc_encode():
+    parity = c_common.crc("8D406B902015A678D4D220AA4BDA", encode=True)
+    assert parity == 11160538
+
+
+def test_icao():
+    assert c_common.icao("8D406B902015A678D4D220AA4BDA") == "406B90"
+    assert c_common.icao("A0001839CA3800315800007448D9") == "400940"
+    assert c_common.icao("A000139381951536E024D4CCF6B5") == "3C4DD2"
+    assert c_common.icao("A000029CFFBAA11E2004727281F1") == "4243D0"
+
+
+def test_modes_altcode():
+    assert c_common.altcode("A02014B400000000000000F9D514") == 32300
+
+
+def test_modes_idcode():
+    assert c_common.idcode("A800292DFFBBA9383FFCEB903D01") == "1346"
+
+
+def test_graycode_to_altitude():
+    assert c_common.gray2alt("00000000010") == -1000
+    assert c_common.gray2alt("00000001010") == -500
+    assert c_common.gray2alt("00000011011") == -100
+    assert c_common.gray2alt("00000011010") == 0
+    assert c_common.gray2alt("00000011110") == 100
+    assert c_common.gray2alt("00000010011") == 600
+    assert c_common.gray2alt("00000110010") == 1000
+    assert c_common.gray2alt("00001001001") == 5800
+    assert c_common.gray2alt("00011100100") == 10300
+    assert c_common.gray2alt("01100011010") == 32000
+    assert c_common.gray2alt("01110000100") == 46300
+    assert c_common.gray2alt("01010101100") == 50200
+    assert c_common.gray2alt("11011110100") == 73200
+    assert c_common.gray2alt("10000000011") == 126600
+    assert c_common.gray2alt("10000000001") == 126700

tests/test_common.py

@@ -1,62 +0,0 @@
-from pyModeS import common
-
-
-def test_conversions():
-    assert common.hex2bin("6E406B") == "011011100100000001101011"
-
-
-def test_crc_decode():
-    assert common.crc_legacy("8D406B902015A678D4D220AA4BDA") == 0
-
-    assert common.crc("8D406B902015A678D4D220AA4BDA") == 0
-    assert common.crc("8d8960ed58bf053cf11bc5932b7d") == 0
-    assert common.crc("8d45cab390c39509496ca9a32912") == 0
-    assert common.crc("8d49d3d4e1089d00000000744c3b") == 0
-    assert common.crc("8d74802958c904e6ef4ba0184d5c") == 0
-    assert common.crc("8d4400cd9b0000b4f87000e71a10") == 0
-    assert common.crc("8d4065de58a1054a7ef0218e226a") == 0
-
-    assert common.crc("c80b2dca34aa21dd821a04cb64d4") == 10719924
-    assert common.crc("a800089d8094e33a6004e4b8a522") == 4805588
-    assert common.crc("a8000614a50b6d32bed000bbe0ed") == 5659991
-    assert common.crc("a0000410bc900010a40000f5f477") == 11727682
-    assert common.crc("8d4ca251204994b1c36e60a5343d") == 16
-    assert common.crc("b0001718c65632b0a82040715b65") == 353333
-
-
-def test_crc_encode():
-    parity = common.crc("8D406B902015A678D4D220AA4BDA", encode=True)
-    assert parity == 11160538
-
-
-def test_icao():
-    assert common.icao("8D406B902015A678D4D220AA4BDA") == "406B90"
-    assert common.icao("A0001839CA3800315800007448D9") == "400940"
-    assert common.icao("A000139381951536E024D4CCF6B5") == "3C4DD2"
-    assert common.icao("A000029CFFBAA11E2004727281F1") == "4243D0"
-
-
-def test_modes_altcode():
-    assert common.altcode("A02014B400000000000000F9D514") == 32300
-
-
-def test_modes_idcode():
-    assert common.idcode("A800292DFFBBA9383FFCEB903D01") == "1346"
-
-
-def test_graycode_to_altitude():
-    assert common.gray2alt("00000000010") == -1000
-    assert common.gray2alt("00000001010") == -500
-    assert common.gray2alt("00000011011") == -100
-    assert common.gray2alt("00000011010") == 0
-    assert common.gray2alt("00000011110") == 100
-    assert common.gray2alt("00000010011") == 600
-    assert common.gray2alt("00000110010") == 1000
-    assert common.gray2alt("00001001001") == 5800
-    assert common.gray2alt("00011100100") == 10300
-    assert common.gray2alt("01100011010") == 32000
-    assert common.gray2alt("01110000100") == 46300
-    assert common.gray2alt("01010101100") == 50200
-    assert common.gray2alt("11011110100") == 73200
-    assert common.gray2alt("10000000011") == 126600
-    assert common.gray2alt("10000000001") == 126700

tests/test_encoder.py

@@ -1,23 +0,0 @@
-from pyModeS import encoder
-
-
-def test_identification():
-    msg = encoder.encode_adsb(
-        icao="406B90", typecode=4, capability=5, category=0, callsign="EZY85MH"
-    )
-    assert msg == "8D406B902015A678D4D220AA4BDA"
-
-
-def test_speed():
-    msg = encoder.encode_adsb(
-        icao="485020",
-        typecode=19,
-        capability=5,
-        speed_type="gs",
-        speed=159,
-        angle=182.88,
-        vertical_rate=-832,
-        vertical_rate_source="gnss",
-        gnss_baro_alt_diff=550,
-    )
-    assert msg == "8D485020994409940838175B284F"

tests/test_py_common.py

@@ -0,0 +1,64 @@
+from pyModeS import py_common
+
+
+def test_conversions():
+    assert py_common.hex2bin("6E") == "01101110"
+    assert py_common.bin2hex("01101110") == "6E"
+    assert py_common.bin2hex("1101110") == "6E"
+
+
+def test_crc_decode():
+    assert py_common.crc_legacy("8D406B902015A678D4D220AA4BDA") == 0
+
+    assert py_common.crc("8D406B902015A678D4D220AA4BDA") == 0
+    assert py_common.crc("8d8960ed58bf053cf11bc5932b7d") == 0
+    assert py_common.crc("8d45cab390c39509496ca9a32912") == 0
+    assert py_common.crc("8d49d3d4e1089d00000000744c3b") == 0
+    assert py_common.crc("8d74802958c904e6ef4ba0184d5c") == 0
+    assert py_common.crc("8d4400cd9b0000b4f87000e71a10") == 0
+    assert py_common.crc("8d4065de58a1054a7ef0218e226a") == 0
+
+    assert py_common.crc("c80b2dca34aa21dd821a04cb64d4") == 10719924
+    assert py_common.crc("a800089d8094e33a6004e4b8a522") == 4805588
+    assert py_common.crc("a8000614a50b6d32bed000bbe0ed") == 5659991
+    assert py_common.crc("a0000410bc900010a40000f5f477") == 11727682
+    assert py_common.crc("8d4ca251204994b1c36e60a5343d") == 16
+    assert py_common.crc("b0001718c65632b0a82040715b65") == 353333
+
+
+def test_crc_encode():
+    parity = py_common.crc("8D406B902015A678D4D220AA4BDA", encode=True)
+    assert parity == 11160538
+
+
+def test_icao():
+    assert py_common.icao("8D406B902015A678D4D220AA4BDA") == "406B90"
+    assert py_common.icao("A0001839CA3800315800007448D9") == "400940"
+    assert py_common.icao("A000139381951536E024D4CCF6B5") == "3C4DD2"
+    assert py_common.icao("A000029CFFBAA11E2004727281F1") == "4243D0"
+
+
+def test_modes_altcode():
+    assert py_common.altcode("A02014B400000000000000F9D514") == 32300
+
+
+def test_modes_idcode():
+    assert py_common.idcode("A800292DFFBBA9383FFCEB903D01") == "1346"
+
+
+def test_graycode_to_altitude():
+    assert py_common.gray2alt("00000000010") == -1000
+    assert py_common.gray2alt("00000001010") == -500
+    assert py_common.gray2alt("00000011011") == -100
+    assert py_common.gray2alt("00000011010") == 0
+    assert py_common.gray2alt("00000011110") == 100
+    assert py_common.gray2alt("00000010011") == 600
+    assert py_common.gray2alt("00000110010") == 1000
+    assert py_common.gray2alt("00001001001") == 5800
+    assert py_common.gray2alt("00011100100") == 10300
+    assert py_common.gray2alt("01100011010") == 32000
+    assert py_common.gray2alt("01110000100") == 46300
+    assert py_common.gray2alt("01010101100") == 50200
+    assert py_common.gray2alt("11011110100") == 73200
+    assert py_common.gray2alt("10000000011") == 126600
+    assert py_common.gray2alt("10000000001") == 126700