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swig/Lib/python/pybuffer.i

+/* Implementing buffer protocol typemaps */
+
+/* %pybuffer_mutable_binary(TYPEMAP, SIZE)
+ *
+ * Macro for functions accept mutable buffer pointer with a size.
+ * This can be used for both input and output. For example:
+ * 
+ *      %pybuffer_mutable_binary(char *buff, int size);
+ *      void foo(char *buff, int size) {
+ *        for(int i=0; i<size; ++i)
+ *          buff[i]++;  
+ *      }
+ */
+
+%define %pybuffer_mutable_binary(TYPEMAP, SIZE)
+%typemap(in) (TYPEMAP, SIZE)
+  (int res, Py_ssize_t size = 0, void *buf = 0) {
+  res = PyObject_AsWriteBuffer($input, &buf, &size);
+  if (res<0) {
+    PyErr_Clear();
+    %argument_fail(res, "(TYPEMAP, SIZE)", $symname, $argnum);
+  }
+  $1 = ($1_ltype) buf;
+  $2 = ($2_ltype) (size/sizeof($*1_type));
+}
+%enddef
+
+/* %pybuffer_mutable_string(TYPEMAP, SIZE)
+ *
+ * Macro for functions accept mutable zero terminated string pointer.
+ * This can be used for both input and output. For example:
+ * 
+ *      %pybuffer_mutable_string(char *str);
+ *      void foo(char *str) {
+ *        while(*str) {
+ *          *str = toupper(*str);
+ *          str++;
+ *      }
+ */
+
+%define %pybuffer_mutable_string(TYPEMAP)
+%typemap(in) (TYPEMAP)
+  (int res, Py_ssize_t size = 0, void *buf = 0) {
+  res = PyObject_AsWriteBuffer($input, &buf, &size);
+  if (res<0) {
+    PyErr_Clear();
+    %argument_fail(res, "(TYPEMAP, SIZE)", $symname, $argnum);
+  }
+  $1 = ($1_ltype) buf;
+}
+%enddef
+
+/* pybuffer_binary(TYPEMAP, SIZE)
+ *
+ * Macro for functions accept read only buffer pointer with a size.
+ * This must be used for input. For example:
+ * 
+ *      %pybuffer_binary(char *buff, int size);
+ *      int foo(char *buff, int size) {
+ *        int count = 0;
+ *        for(int i=0; i<size; ++i)
+ *          if (0==buff[i]) count++;
+ *        return count;
+ *      }
+ */
+
+%define %pybuffer_binary(TYPEMAP, SIZE)
+%typemap(in) (TYPEMAP, SIZE)
+  (int res, Py_ssize_t size = 0, const void *buf = 0) {
+  res = PyObject_AsReadBuffer($input, &buf, &size);
+  if (res<0) {
+    PyErr_Clear();
+    %argument_fail(res, "(TYPEMAP, SIZE)", $symname, $argnum);
+  }
+  $1 = ($1_ltype) buf;
+  $2 = ($2_ltype) (size / sizeof($*1_type));
+}
+%enddef
+
+/* %pybuffer_string(TYPEMAP, SIZE)
+ *
+ * Macro for functions accept read only zero terminated string pointer.
+ * This can be used for input. For example:
+ * 
+ *      %pybuffer_string(char *str);
+ *      int foo(char *str) {
+ *        int count = 0;
+ *        while(*str) {
+ *          if (isalnum(*str))
+ *            count++;
+ *          str++;
+ *      }
+ */
+
+%define %pybuffer_string(TYPEMAP)
+%typemap(in) (TYPEMAP)
+  (int res, Py_ssize_t size = 0, const void *buf = 0) {
+  res = PyObject_AsReadBuffer($input, &buf, &size);
+  if (res<0) {
+    %argument_fail(res, "(TYPEMAP, SIZE)", $symname, $argnum);
+  }
+  $1 = ($1_ltype) buf;
+}
+%enddef
+
+
+