Create separate C and python interface for better docs building

Author: rhpvorderman

src/isal/igzip_lib.pxd

@@ -19,6 +19,7 @@
 # SOFTWARE.
 
 # cython: language_level=3
+# cython: binding=True
 
 cdef extern from "<isa-l/igzip_lib.h>":
     # Deflate compression standard defines
@@ -492,16 +493,16 @@ cdef:
 
 cdef int mem_level_to_bufsize(int compression_level, int mem_level, unsigned int *bufsize)
 
-cpdef compress(data,
-             int level= ?,
-             int flag = ?,
-             int mem_level = ?,
-             int hist_bits = ?,
+cdef _compress(data,
+             int level,
+             int flag,
+             int mem_level,
+             int hist_bits,
             )
 
-cpdef decompress(data,
-                 int flag = ?,
-                 int hist_bits= ?,
-                 Py_ssize_t bufsize= ?)
+cdef _decompress(data,
+                 int flag,
+                 int hist_bits,
+                 Py_ssize_t bufsize)
 
 cdef bytes view_bitbuffer(inflate_state * stream)

src/isal/igzip_lib.pyx

@@ -168,7 +168,7 @@ cdef void arrange_input_buffer(stream_or_state *stream, Py_ssize_t *remains):
     stream.avail_in = <unsigned int>py_ssize_t_min(remains[0], UINT32_MAX)
     remains[0] -= stream.avail_in
 
-cpdef compress(data,
+def compress(data,
              int level=ISAL_DEFAULT_COMPRESSION_I,
              int flag = IGZIP_DEFLATE,
              int mem_level = MEM_LEVEL_DEFAULT_I,
@@ -196,6 +196,15 @@ cpdef compress(data,
                       hist_bits is not used to set the compression flag.
                       This is best left at the default (15, maximum).
     """
+    return _compress(data, level, flag, mem_level, hist_bits)
+
+
+cdef _compress(data,
+             int level,
+             int flag,
+             int mem_level,
+             int hist_bits,
+            ):
     # Initialise stream
     cdef isal_zstream stream
     cdef unsigned int level_buf_size
@@ -252,7 +261,7 @@ cpdef compress(data,
         PyMem_Free(obuf)
 
 
-cpdef decompress(data,
+def decompress(data,
                  int flag = ISAL_DEFLATE,
                  int hist_bits=ISAL_DEF_MAX_HIST_BITS,
                  Py_ssize_t bufsize=DEF_BUF_SIZE):
@@ -274,6 +283,13 @@ cpdef decompress(data,
                     larger buffer will improve performance by negating the 
                     costs associated with the dynamic resizing.
     """
+    return _decompress(data, flag, hist_bits, bufsize)
+
+
+cdef _decompress(data,
+                 int flag,
+                 int hist_bits,
+                 Py_ssize_t bufsize):
     if bufsize < 0:
         raise ValueError("bufsize must be non-negative")
 

src/isal/isal_zlib.pyx

@@ -85,8 +85,8 @@ from .igzip_lib cimport(
     view_bitbuffer,)
 
 # Alias igzip_lib compress and decompress functions
-from .igzip_lib cimport compress as igzip_compress
-from .igzip_lib cimport decompress as igzip_decompress
+from .igzip_lib cimport _compress as igzip_compress
+from .igzip_lib cimport _decompress as igzip_decompress
 
 from . import igzip_lib
 from libc.stdint cimport UINT64_MAX, UINT32_MAX