news

Version 0.10.0 is a bugfix release.

• Removed Python 2 compatibility. Use pycrc v0.9.x if Python 2 is required.
• The xor-in value is never reflected. Thanks to Ralf Schlatterbeck·.
• Update to pyproject.toml for packaging.
• Use pytest for regression tests.

• ZIP file: pycrc-0.10.0.zip
• TGZ file: pycrc-0.10.0.tar.gz

Version 0.9.3 is a bugfix release.

• Fix compatibility with Python 3.10. Fixes #46.
• Slightly improved the performance of the bit-by-bit-fast algorithm.

• ZIP file: pycrc-0.9.3.zip
• TGZ file: pycrc-0.9.3.tar.gz

Version 0.9.2 is a bugfix release.

• Fix code generator to output the table correctly. Fixes #28.
• Ensure the data is aligned when using slice-by. Fixes #24.
• Fixed some spellings. Thanks to Jeff Widman.

• ZIP file: pycrc-0.9.2.zip
• TGZ file: pycrc-0.9.2.tar.gz

Version 0.9.1 is a bugfix release.

• Added checks about possibly unsuitable polynomials. Use the --force-poly option to override the error message.
• Added setup.py script to install pycrc on the system, if desired.
• Completely rewritten the code generator back-end. The new back-end is more flexible and allows for a better optimisation of the generated expressions.
• Moved the python code under the pycrc directory and changed how the pycrc sub-modules are included. Before one would write import crc_xxx, now one would write import pycrc.xxx.
• New license for the documentation: Creative Commons Attribution-Share Alike 4.0 Unported License.
• Fixed binary files handling with Python 2.7. Fixes #11. Thanks to James Bowman.
• Fixed some spelling. Thanks to Frank (ftheile) and ashelly.
• Fixed Header Guard generation. Don't use underscores to start the header guard name. Thanks to Andre Hartmann.

• ZIP file: pycrc-0.9.1.zip
• TGZ file: pycrc-0.9.1.tar.gz

Version 0.9 is a feature release.

• Added a new option --slice-by.
• Suppressed the crc_reflect function where not needed. Addresses part of #8. Thanks to Craig McQueen.
• Allow strings with values greater than 0x80 in --check-hexstring.
• Fixed a bug in CRC when the width is less than 8. Thanks to Steve Geo.
• Fixed the initial value of the 16-bit CCITT algorithm. Renamed the model from ccitt to crc-16-ccitt. Fixes #7. Thanks to Craig McQueen.
• Simplified the implementation where Width is less than 8 bits.
• Run the code through pylint.

The --slice-by option is a major new feature. It enables a variant of the table-driven algorithm that operates on 32 bits of data or more at a time rather than 8 bits. This can dramatically speed-up the calculation of the CRC, at the cost of increased code and data size. Note: this option is still experimental and not well-tested. Check your results and please raise bugs if you find problems. Also not all CRC models can be used currently with the --slice-by option. This will change in future.

Compliance with PEP 0008 required a change in the python API. Member variables of classes should be in lowercase and not in CamelCase.

• ZIP file: pycrc-0.9.zip
• TGZ file: pycrc-0.9.tar.gz

Version 0.8.3 is a minor bugfix release.

• pycrc has a new homepage: pycrc.org
• Removed the experimental --bitwise-expression option to facilitate restructuring of the code.
• Applied some minor optimisations to the generated table-driven code.
• Changed the signature of the crc_update() function: the data argument is now a pointer to void to improve compatibility with C++.
• Added a AUTHORS file. If I have forgotten to mention someone please don't hesitate to send a mail.
• Upgraded documentation to DocBook 5.

In an effort to move away from sourceforge, a few changes in the organisation of pycrc: the sourceforge issue tracker is now closed and people are encouraged to use the GitHub tracker. All past releases can be downloaded from the pycrc news page.

• ZIP file: pycrc-0.8.3.zip
• TGZ file: pycrc-0.8.3.tar.gz

Version 0.8.2 is a bugfix release.

• Removed warning about even polynomials. As Lars Pötter rightly pointed out, polynomials may be even.
• Updated the generated code to cope with big Widths (>32 bits) on 32 bit processors.
• The table-driven code for polynomials of width < 8 using a table index width < 8 was producing a wrong checksum. Thanks to Radosław Gancarz.
• Fixed a typo in the documentation. Thanks to Andreas Nebenfuehr.

• ZIP file: pycrc-0.8.2.zip
• TGZ file: pycrc-0.8.2.tar.gz

Version 0.8.1 is a feature release.

• Remove obsolete and unused 'direct' parameter. Thanks to Matthias Urlichs.
• Don't recurse into main() when an unknown algorithm is selected. Thanks to Matthias Urlichs.
• Fixed a bug in the handling of hex strings in Python3. Thanks to Matthias Kuehlewein.
• The input to the CRC routines can now be bytes or strings.
• Re-organised the symbol table.
• Updated qm.py from https://github.com/tpircher/quine-mccluskey.

• ZIP file: pycrc-0.8.1.zip
• TGZ file: pycrc-0.8.1.tar.gz

Version 0.8 is a bugfix release.

• Added the experimental bitwise-expression generator target.
• Allow to specify the --include option multiple times.
• Completely revisited and reworked the documentation.
• Allow to abbreviate the names of the algorithms.
• Minor documentation changes.

The bitwise-expression generator is an experimental feature, which might one day be almost as fast as the table-driven code but much smaller. At the moment the generated code is bigger and slower than any other algorithm, so use at your own risk.

• ZIP file: pycrc-0.8.zip
• TGZ file: pycrc-0.8.tar.gz

Version 0.7.11 is a minor bugfix release.

• Improved Python3 compatibility. pycrc now requires Python 2.6 or later.
• Fixed a wrong check value of the crc-64-jones model.
• Don't use snprintf() with c89 code, changed to sprintf().
• Rewrote the regression test script in Python.

• ZIP file: pycrc-0.7.11.zip
• TGZ file: pycrc-0.7.11.tar.gz

Version 0.7.10 is a minor feature and bugfix release.

• Added the CRC models crc-12-3gpp, crc-16-genibus, crc-32-bzip2 and crc-64-xz.
• Fixed bad-looking generated C code. Thanks to "intgr" for the fix.
• Fixed a mistake in the man page that still used the old model name crc-32mpeg instead of crc-32-mpeg. Thanks to Marek Erban.
• Smaller code cleanups.

• ZIP file: pycrc-0.7.10.zip
• TGZ file: pycrc-0.7.10.tar.gz

Version 0.7.9 is a minor bugfix release.

• Fixed a bug in the generated C89 code that included stdint.h. (This time for real!)
• Fixed a bug in the generated C89 code when using a 64 bit CRC.
• The --verbose option made pycrc quit without error message.

• ZIP file: pycrc-0.7.9.zip
• TGZ file: pycrc-0.7.9.tar.gz

pycrc has now a repository on GitHub. Feel free to fork and to contribute back!

Version 0.7.8 is a minor bugfix release.

• The C99 header file stdint.h is no more included in C89/ANSI code.
• Found a more helpful name of the included pycrc header file when generating C code to stdout. Thanks to Lorenzo Cappelletti.
• Removed an unused variable in the option parser.

• ZIP file: pycrc-0.7.8.zip
• TGZ file: pycrc-0.7.8.tar.gz

Version 0.7.7 is a minor bugfix release.

• Substituted the deprecated function atoi() with int(). Closes issue 3136566. Thanks to Tony Smith.
• Updated the documentation with a Windows-style call of the python interpreter.
• Fixed a few coding style issues found by pylint and pychecker.

• ZIP file: pycrc-0.7.7.zip
• TGZ file: pycrc-0.7.7.tar.gz

Version 0.7.6 is a minor bugfix release.

• Fixed a minor bug in the command line parsing of the generated main function.
• Use integer division for Python3 compatibility.
• Complete rewrite of the internal macro language and code generator.

• ZIP file: pycrc-0.7.6.zip
• TGZ file: pycrc-0.7.6.tar.gz

I have added a Tutorial how to use the generated source code in your program.

• The table-driven algorithm can handle widths that are not byte-aligned as well as widths less than 8. This feature was heavily inspired by a similar feature in Danjel McGougan's Universal Crc.
• Removed half-baked and confusing --direct option. Closes issue 2938846.
• Code clean-up; the generated C code should no more generate warnings about unused variables.

Version 0.7.5 introduces a C/C++ API change: this version introduces the additional (internal) parameter crc_shift in the crc_cfg_t structure. This variable is used by the table-driven algorithm when the width is not defined during code generation. This variable is zero if the width is ≥ 8.

• ZIP file: pycrc-0.7.5.zip
• TGZ file: pycrc-0.7.5.tar.gz

• Set xmodem parameters equal to zmodem parameters.
• Changed the xor-in value of the crc-64-jones model.
• Added crc-16-modbus model. Closes issue 2896611.
• pycrc now writes a warning message if an even polynomial is used.
• Fix for unused variable argv. Closes issue 2893224. Thanks to Marko von Oppen.

• ZIP file: pycrc-0.7.4.zip
• TGZ file: pycrc-0.7.4.tar.gz

• a new CRC model, crc-64-jones was added. Thanks to Waterspirit.
• crc-32mpeg was renamed to crc-32-mpeg.

• ZIP file: pycrc-0.7.3.zip
• TGZ file: pycrc-0.7.3.tar.gz

• The result of the Python table-driven code was not being evaluated at all. Thanks to Ildar Muslukhov.

• ZIP file: pycrc-0.7.2.zip
• TGZ file: pycrc-0.7.2.tar.gz

• a new CRC model, crc-32mpeg (now crc-32-mpeg) was added. Thanks to Thomas Edwards.

• ZIP file: pycrc-0.7.1.zip
• TGZ file: pycrc-0.7.1.tar.gz

• added --direct option. Now it is possible to select 'direct' and 'not direct' version of the algorithm.
• added --check-hexstring option. With this option it is possible to check a hexadecimal number on-the-fly. Closes issue 2545183. Thanks to Arnim Littek.
• added a check for extra arguments on the command line. Previously, additional arguments were silently ignored. Closes issue 2545185. Thanks to Arnim Littek.

• ZIP file: pycrc-0.7.zip
• TGZ file: pycrc-0.7.tar.gz

• The code should run on both Python 2.x and 3.0.
• Fixed a bug that gave wrong results on x64 platforms.
• Fixed a bug that raised an exception when an unknown model was selected.

• ZIP file: pycrc-0.6.7.zip
• TGZ file: pycrc-0.6.7.tar.gz

• Fixed a bug in the print_params() function. Closes issue 1985197. Thanks to Artur Lipowski.
• Using Creative Commons license for the documentation.

• ZIP file: pycrc-0.6.6.zip
• TGZ file: pycrc-0.6.6.tar.gz

• fixed a problem with the generated code for bit-by-bit-fast algorithms. Thanks to Hans Bacher.
• added extern "C" declaration to the generated C header file. Thanks to Nathan Royer.
• added --crc-type and --include-file options.

• ZIP file: pycrc-0.6.5.zip
• TGZ file: pycrc-0.6.5.tar.gz

• Fixed issue 1843774: The code does not work for multiple calls to crc_update().

• ZIP file: pycrc-0.6.4.zip
• TGZ file: pycrc-0.6.4.tar.gz

• Fixed issue 1812894: portability problems in the generated code. Thanks to Helmut Bauer.
• Fixed issue 1794343: --check-file works now with --width < 8.
• Fixed issue 1794344: unnecessary restriction on the width when using the bit-by-bit-fast algorithm.

• ZIP file: pycrc-0.6.3.zip
• TGZ file: pycrc-0.6.3.tar.gz

• Fixed issue 1781637: The parameter to --check-string is ignored.
• Fixed issue 1727128: Generated Table driven code is ugly/not elegant.

• ZIP file: pycrc-0.6.2.zip
• TGZ file: pycrc-0.6.2.tar.gz

• Bugfix in the source code generator for C89: Compilation error due to mismatch of parameters in the crc_finalize() function.
• Changes related to 919107: Code generator includes reflect() function even if not needed.
• Fixed a typo in the C89 source code generator. Thanks to Helmut Bauer
• Documentation tidy-up.
• Previously deprecated command line options have been deleted in this version.

• ZIP file: pycrc-0.6.1.zip
• TGZ file: pycrc-0.6.1.tar.gz

• This release contains a major rewrite of the code generation back-end and a re-organisation of the source code.
• With version v0.6 the license has changed from (a modified) GPLv2 to MIT. This makes it hopefully easier to deploy the source code in third-party programs.
• There are also several other minor improvements.

• ZIP file: pycrc-0.6.zip
• TGZ file: pycrc-0.6.tar.gz

Version 0.5 of pycrc was released today. This release includes minor fixes and corrections. No new features are added.

• ZIP file: pycrc-0.5.zip
• TGZ file: pycrc-0.5.tar.gz

• This version calculates the checksum of files and new parameter sets are added.
• The generated source code is now documented in Doxygen style.

• ZIP file: pycrc-0.4.zip
• TGZ file: pycrc-0.4.tar.gz

Version 0.3 of pycrc was released today. This is the first public release. Although it is in a early beta stage, most of the main functionality is implemented.

• ZIP file: pycrc-0.3.zip
• TGZ file: pycrc-0.3.tar.gz