IO callbacks restored

pandas/_libs/parsers.pyx

@@ -325,6 +325,15 @@ cdef double round_trip_wrapper(const char *p, char **q, char decimal,
  return round_trip(p, q, decimal, sci, tsep, skip_trailing, error, maybe_int)
 
 
+cdef void* buffer_rd_bytes_wrapper(void *source, size_t nbytes,
+ size_t *bytes_read, int *status,
+ const char *encoding_errors):
+ return buffer_rd_bytes(source, nbytes, bytes_read, status, encoding_errors)
+
+cdef int del_rd_source_wrapper(void *src):
+ return del_rd_source(src)
+
+
 cdef class TextReader:
  """
 
@@ -634,8 +643,8 @@ cdef class TextReader:
 
  ptr = new_rd_source(source)
  self.parser.source = ptr
- # self.parser.cb_io = &(PandasParser_CAPI.buffer_rd_bytes)
- # self.parser.cb_cleanup = &(PandasParser_CAPI.del_rd_source)
+ self.parser.cb_io = buffer_rd_bytes_wrapper
+ self.parser.cb_cleanup = del_rd_source_wrapper
 
  cdef _get_header(self, list prelim_header):
  # header is now a list of lists, so field_count should use header[0]