This code uses Cython to wrap C functions which take pointers to arrays as both IN and INOUT arguments.

Example code for wrapping an existing C dynamic library in Python by using Cython.

Build the dynamic library and Cython wrapper using the following shell script:

./build_cython.sh

Run pytest unit tests to verify everything is working as intended for the Cython wrapper: ./py.test -v

• C implementation
  • fastlz.h/.c
• Cython wrapper
  • Cython declaration
    • cfastlz.pxd
  • Cython wrapper
    • cyfastlz.pyx
  • Setuptools script
    • setup.py
  • pytest unit tests
    • test_cython_wrapper.py

You need to fill in the TODO: blocks in cfastlz.pxd and cyfastlz.pyx

Some useful things to keep in mind:

1. Read the documentation in fastlz.h to understand how the compress() and decompress() functions work.
2. You can cast from a Python type to a C type using syntax like the following:

<const uint8_t*>in_buf

3. In Python, you can use slicing to return a subarray, substring, etc using syntax similar to:

my_array = range(10)
my_array[2:7]
[2, 3, 4, 5, 6]

The slice includes the starting index, but excludes the ending index.

You know you are done when the unit test passes.

The solution is on the solutions branch. Don't peak until you have given this an honest effort.