ggwave : update bindings to toggle logging on and off (#55)

ref #54

bindings/python/cggwave.pxd

@@ -47,3 +47,5 @@ cdef extern from "ggwave.h" nogil:
             const char * dataBuffer,
             int dataSize,
             char * outputBuffer);
+
+    void ggwave_setLogFile(void * fptr);

bindings/python/ggwave.pyx

@@ -1,5 +1,6 @@
 cimport cython
 
+from libc.stdio cimport stderr
 from cpython.mem cimport PyMem_Malloc, PyMem_Free
 
 import re
@@ -62,3 +63,9 @@ def decode(instance, waveform):
         return coutput[0:rxDataLength]
 
     return None
+
+def disableLog():
+    cggwave.ggwave_setLogFile(NULL);
+
+def enableLog():
+    cggwave.ggwave_setLogFile(stderr);

bindings/python/test.py

@@ -3,6 +3,9 @@ import ggwave
 
 testFailed = False
 
+ggwave.disableLog()
+ggwave.enableLog()
+
 samples = ggwave.encode("hello python")
 
 if not (samples):