Add test case for extensions decoding

tests/Makefile

@@ -8,7 +8,7 @@ TESTS=  decode_unittests encode_unittests \
 	test_decode_callbacks test_encode_callbacks \
 	test_missing_fields test_no_messages test_funny_name \
 	test_multiple_files test_cxxcompile test_options \
-	bc_encode bc_decode test_encode_extensions
+	bc_encode bc_decode test_encode_extensions test_decode_extensions
 
 # More strict checks for the core part of nanopb
 CC_VERSION=$(shell $(CC) -v 2>&1)
@@ -85,6 +85,7 @@ test_funny_name: funny-proto+name.pb.h funny-proto+name.pb.o
 bc_encode: bc_alltypes.pb.o pb_encode.o bc_encode.o
 bc_decode: bc_alltypes.pb.o pb_decode.o bc_decode.o
 test_encode_extensions: test_encode_extensions.c pb_encode.o alltypes.pb.o extensions.pb.o
+test_decode_extensions: test_decode_extensions.c pb_decode.o alltypes.pb.o extensions.pb.o
 
 %.pb: %.proto
 	protoc -I. -I../generator -I/usr/include -o$@ $<
@@ -126,6 +127,7 @@ run_unittests: $(TESTS)
 	./test_encode3_buf 1 | ./test_decode3_buf 1
 	./test_decode3 < alltypes_with_extra_fields.pb
 	./bc_encode | ./bc_decode
+	./test_encode_extensions | ./test_decode_extensions
 
 	./test_missing_fields
 

tests/test_decode_extensions.c

@@ -0,0 +1,35 @@
+/* Test decoding of extension fields. */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <pb_decode.h>
+#include "alltypes.pb.h"
+#include "extensions.pb.h"
+
+int main(int argc, char **argv)
+{
+    uint8_t buffer[1024];
+    size_t count = fread(buffer, 1, sizeof(buffer), stdin);
+    pb_istream_t stream = pb_istream_from_buffer(buffer, count);
+    
+    AllTypes alltypes = {};
+    int32_t extensionfield1;
+    pb_extension_t ext1 = {&AllTypes_extensionfield1, &extensionfield1, NULL};
+    alltypes.extensions = &ext1;
+    
+    if (!pb_decode(&stream, AllTypes_fields, &alltypes))
+    {
+        printf("Parsing failed: %s\n", PB_GET_ERROR(&stream));
+        return 1;
+    }
+
+    if (extensionfield1 != 12345)
+    {
+        printf("Wrong value for extension field: %d\n", extensionfield1);
+        return 2;
+    }    
+    
+    return 0;
+}
+

tests/test_encode_extensions.c

@@ -10,7 +10,7 @@
 
 int main(int argc, char **argv)
 {
-    AllTypes alltypes = {0};
+    AllTypes alltypes = {};
     int32_t extensionfield1 = 12345;
     pb_extension_t ext1 = {&AllTypes_extensionfield1, &extensionfield1, NULL};