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Additional EBCDIC codecs

Project description

ebcdic is a Python package adding additional EBCDIC codecs for data exchange with legacy system. It works with Python 2.7 and Python 3.4+.

EBCDIC is short for Extended Binary Coded Decimal Interchange Code and is a family of character encodings that is mainly used on mainframe computers. There is no real point in using it unless you have to exchange data with legacy systems that still only support EBCDIC as character encoding.

Installation

The ebcdic package is available from https://pypi.python.org/pypi/ebcdic and can be installed using pip:

pip install ebcdic

Example usage

To encode 'hello world' on EBCDIC systems in German speaking countries, use:

>>> import ebcdic
>>> 'hello world'.encode('cp1141')
b'\x88\x85\x93\x93\x96@\xa6\x96\x99\x93\x84O'

Supported codecs

The ebcdic package includes EBCDIC codecs for the following regions:

  • cp290 - Japan (Katakana)
  • cp420 - Arabic bilingual
  • cp424 - Israel (Hebrew)
  • cp833 - Korea Extended (single byte)
  • cp838 - Thailand
  • cp870 - Eastern Europe (Poland, Hungary, Czech, Slovakia, Slovenia, Croatian, Serbia, Bulgarian); represents Latin-2
  • cp1097 - Iran (Farsi)
  • cp1140 - Australia, Brazil, Canada, New Zealand, Portugal, South Africa, USA
  • cp1141 - Austria, Germany, Switzerland
  • cp1142 - Denmark, Norway
  • cp1143 - Finland, Sweden
  • cp1144 - Italy
  • cp1145 - Latin America, Spain
  • cp1146 - Great Britain, Ireland, North Ireland
  • cp1147 - France
  • cp1148 - International
  • cp1148ms - International, Microsoft interpretation; similar to cp1148 except that 0x15 is mapped to 0x85 (“next line”) instead if 0x0a (“linefeed”)
  • cp1149 - Iceland

It also includes legacy codecs:

  • cp037 - Australia, Brazil, Canada, New Zealand, Portugal, South Africa; similar to cp1140 but without Euro sign
  • cp273 - Austria, Germany, Switzerland; similar to cp1141 but without Euro sign
  • cp277 - Denmark, Norway; similar to cp1142 but without Euro sign
  • cp278 - Finland, Sweden; similar to cp1143 but without Euro sign
  • cp280 - Italy; similar to cp1141 but without Euro sign
  • cp284 - Latin America, Spain; similar to cp1145 but without Euro sign
  • cp285 - Great Britain, Ireland, North Ireland; similar to cp1146 but without Euro sign
  • cp297 - France; similar to cp1147 but without Euro sign
  • cp500 - International; similar to cp1148 but without Euro sign
  • cp500ms - International, Microsoft interpretation; identical to codecs.cp500 similar to ebcdic.cp500 except that 0x15 is mapped to 0x85 (“next line”) instead if 0x0a (“linefeed”)
  • cp871 - Iceland; similar to cp1149 but without Euro sign
  • cp875 - Greece; similar to cp9067 but without Euro sign and a few other characters
  • cp1025 - Cyrillic
  • cp1047 - Open Systems (MVS C compiler)
  • cp1112 - Estonia, Latvia, Lithuania (Baltic)
  • cp1122 - Estonia; similar to cp1157 but without Euro sign
  • cp1123 - Ukraine; similar to cp1158 but without Euro sign

Codecs in the standard library overrule some of these codecs. At the time of this writing this concerns cp037, cp273 (since 3.4), cp500 and cp1140.

To see get a list of EBCDIC codecs that are already provided by different sources, use ebcdic.ignored_codec_names(). For example, with Python 3.6 the result is:

>>> ebcdic.ignored_codec_names()
['cp037', 'cp1140', 'cp273', 'cp424', 'cp500', 'cp875']

Unsupported codecs

According to a comprehensive list of code pages, there are additional codecs this package does not support yet. Possible reasons and solutions are:

  1. It’s a double byte codec, e.g. cp834 (Korea). Technically CodecMapper can easily support them by increasing the mapping size from 256 to 65536. Due lack of test date and access to Asian mainframes this was deemed too experimental for now.
  2. The codec contains combining characters, e.g. cp1132 (Lao) which allows to represent more than 256 characters combining several characters.
  3. Java does not include a mapping for the respective code page, e.g. cp410/880 (Cyrillic). You can add such a codec based on the information found at the link above and submit an enhancement request for the Java standard library. Once it is released, simply add the new codec to the build.xml as described below.
  4. I missed a codec. Simply open an issue on Github at https://github.com/roskakori/CodecMapper/issues and it will be added with the next version.

Source code

These codecs have been generated using CodecMapper, available from https://github.com/roskakori/CodecMapper. Read the README in order to to build the ebcdic package from source.

To add another 8 bit EBCDIC codec just extend the ant target ebcdic in build.xml using a line like:

<arg value="cpXXX" />

Replace XXX by the number of the 8 bit code page you want to include.

Then run:

ant test

to build and test the distribution.

The ebcdic/setup.py automatically includes the new encoding in the package and ebcdic/__init__.py registers it during import ebcdic, so no further steps are needed.

Changes

Version 1.1.1, 2019-08-09

  • Moved license information from README to LICENSE (#5). This required the distribution to change from sdist to wheel because apparently it is a major challenge to include a text file in a platform independent way (#11).

    Sadly this breaks compatibility with Python 2.6, 3.1, 3.2 and 3.3. If you still need ebcdic with one of these Python versions, use ebcdic-1.0.0.

    This took several attempts and intermediate releases that where broken in different ways on different platforms. To prevent people from accidentally installing one of these broken releases they have been removed from PyPI. If you still want to take a look at them, use the respective tags.

Version 1.0.0, 2019-06-06

  • Changed development status to “Production/Stable”.
  • Added international code pages cp500ms and cp1148ms which are the Microsoft interpretations of the respective IBM code pages. The only difference is that 0x1f is mapped to 0x85 (“next line”) instead of 0x0a (“new line”). Note that codecs.cp500 included with the Python standard library also uses the Microsoft interpretation (#4).
  • Added Arabian bilingual code page 420.
  • Added Baltic code page 1112.
  • Added Cyrillic code page 1025.
  • Added Eastern Europe code page 870.
  • Added Estonian code pages 1122 and 1157.
  • Added Greek code page 875.
  • Added Farsi Bilingual code page 1097.
  • Added Hebrew code page 424 and 803.
  • Added Korean code page 833.
  • Added Meahreb/French code page 425.
  • Added Japanese (Katakana) code page 290.
  • Added Thailand code page 838.
  • Added Turkish code page 322.
  • Added Ukraine code page 1123.
  • Added Python 3.5 to 3.8 as supported version.
  • Improved PEP8 conformance of generated codecs.

Version 0.7, 2014-11-17

  • Clarified which codecs are already part of the standard library and that these codecs overrule the ebcdic package. Also added a function ebcdic.ignored_codec_names() that returns the name of the EBCDIC codecs provided by other means. To obtain access to ebcdic codecs overruled by the standard library, use ebcdic.lookup().
  • Cleaned up (PEP8, __all__, typos, …).

Version 0.6, 2014-11-15

  • Added support for Python 2.6+ and 3.1+ (#1).
  • Included a modified version of gencodec.py that still builds maps instead of tables so the generated codecs work with Python versions earlier than 3.3. It also does a from __future__ import unicode_literals so the codecs even work with Python 2.6+ using the same source code. As a side effect, this simplifies building the codecs because it removes the the need for a local copy of the cpython source code.

Version 0.5, 2014-11-13

  • Initial public release

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