Fix bugs in extension support when multiple extension fields are present.

generator/nanopb_generator.py

@@ -313,16 +313,19 @@ class ExtensionField(Field):
             raise NotImplementedError("Only 'optional' is supported for extension fields. "
                + "(%s.rules == %s)" % (self.fullname, self.rules))
 
+        self.rules = 'OPTEXT'
+
     def extension_decl(self):
         '''Declaration of the extension type in the .pb.h file'''
-        return 'extern const pb_extension_type_t %s;' % self.fullname
+        return 'extern const pb_extension_type_t %s;\n' % self.fullname
 
     def extension_def(self):
         '''Definition of the extension type in the .pb.c file'''
+
         result  = 'typedef struct {\n'
         result += str(self)
-        result += '} %s;\n' % self.struct_name
-        result += ('static const pb_field_t %s_field = %s;\n' %
+        result += '\n} %s;\n\n' % self.struct_name
+        result += ('static const pb_field_t %s_field = \n  %s;\n\n' %
                     (self.fullname, self.pb_field_t(None)))
         result += 'const pb_extension_type_t %s = {\n' % self.fullname
         result += '    NULL,\n'

pb.h

@@ -364,6 +364,17 @@ struct _pb_extension_t {
     {tag, PB_ATYPE_CALLBACK | PB_HTYPE_REPEATED | ltype, \
     pb_delta_end(st, m, pm), 0, pb_membersize(st, m), 0, ptr}
 
+/* Optional extensions don't have the has_ field, as that would be redundant. */
+#define PB_OPTEXT_STATIC(tag, st, m, pm, ltype, ptr) \
+    {tag, PB_ATYPE_STATIC | PB_HTYPE_OPTIONAL | ltype, \
+    0, \
+    0, \
+    pb_membersize(st, m), 0, ptr}
+
+#define PB_OPTEXT_CALLBACK(tag, st, m, pm, ltype, ptr) \
+    {tag, PB_ATYPE_CALLBACK | PB_HTYPE_OPTIONAL | ltype, \
+    0, 0, pb_membersize(st, m), 0, ptr}
+
 /* The mapping from protobuf types to LTYPEs is done using these macros. */
 #define PB_LTYPE_MAP_BOOL       PB_LTYPE_VARINT
 #define PB_LTYPE_MAP_BYTES      PB_LTYPE_BYTES

pb_encode.c

@@ -161,9 +161,14 @@ static bool checkreturn encode_static_field(pb_ostream_t *stream,
 {
     pb_encoder_t func;
     const void *pSize;
+    bool dummy = true;
     
     func = PB_ENCODERS[PB_LTYPE(field->type)];
-    pSize = (const char*)pData + field->size_offset;
+    
+    if (field->size_offset)
+        pSize = (const char*)pData + field->size_offset;
+    else
+        pSize = &dummy;
     
     switch (PB_HTYPE(field->type))
     {