Add testcase for releasing memory in submessages/extensions

tests/mem_release/SConscript

@@ -0,0 +1,13 @@
+Import("env", "malloc_env")
+
+env.NanopbProto("mem_release.proto")
+
+test = malloc_env.Program(["mem_release.c",
+                    "mem_release.pb.c",
+                    "$COMMON/pb_encode_with_malloc.o",
+                    "$COMMON/pb_decode_with_malloc.o",
+                    "$COMMON/pb_common_with_malloc.o",
+                    "$COMMON/malloc_wrappers.o"])
+
+env.RunTest(test)
+

tests/mem_release/mem_release.c

@@ -0,0 +1,112 @@
+/* Make sure that all fields are freed in various scenarios. */
+
+#include <pb_decode.h>
+#include <pb_encode.h>
+#include <malloc_wrappers.h>
+#include <stdio.h>
+#include <test_helpers.h>
+#include "mem_release.pb.h"
+
+#define TEST(x) if (!(x)) { \
+    fprintf(stderr, "Test " #x " on line %d failed.\n", __LINE__); \
+    return false; \
+    }
+
+static char *test_str_arr[] = {"1", "2", ""};
+static SubMessage test_msg_arr[] = {SubMessage_init_zero, SubMessage_init_zero};
+
+static bool do_test()
+{
+    uint8_t buffer[256];
+    size_t msgsize;
+    
+    /* Construct a message with various fields filled in */
+    {
+        TestMessage msg = TestMessage_init_zero;
+        pb_extension_t ext1, ext2;
+        pb_ostream_t stream;
+        msg.static_req_submsg.dynamic_str = "12345";
+        msg.static_req_submsg.dynamic_str_arr_count = 3;
+        msg.static_req_submsg.dynamic_str_arr = test_str_arr;
+        msg.static_req_submsg.dynamic_submsg_count = 2;
+        msg.static_req_submsg.dynamic_submsg = test_msg_arr;
+        msg.static_req_submsg.dynamic_submsg[1].dynamic_str = "abc";
+        msg.static_opt_submsg.dynamic_str = "abc";
+        msg.has_static_opt_submsg = true;
+        msg.dynamic_submsg = &msg.static_req_submsg;
+        
+        msg.extensions = &ext1;
+        ext1.type = &dynamic_ext;
+        ext1.dest = &msg.static_req_submsg;
+        ext1.next = &ext2;
+        ext2.type = &static_ext;
+        ext2.dest = &msg.static_req_submsg;
+        ext2.next = NULL;
+        
+        stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
+        if (!pb_encode(&stream, TestMessage_fields, &msg))
+        {
+            fprintf(stderr, "Encode failed: %s\n", PB_GET_ERROR(&stream));
+            return false;
+        }
+        msgsize = stream.bytes_written;
+    }
+    
+    /* Output encoded message for debug */
+    SET_BINARY_MODE(stdout);
+    fwrite(buffer, 1, msgsize, stdout);
+    
+    /* Decode memory using dynamic allocation */
+    {
+        TestMessage msg = TestMessage_init_zero;
+        pb_istream_t stream;
+        SubMessage ext2_dest;
+        pb_extension_t ext1, ext2;
+        
+        msg.extensions = &ext1;
+        ext1.type = &dynamic_ext;
+        ext1.dest = NULL;
+        ext1.next = &ext2;
+        ext2.type = &static_ext;
+        ext2.dest = &ext2_dest;
+        ext2.next = NULL;
+        
+        stream = pb_istream_from_buffer(buffer, msgsize);
+        if (!pb_decode(&stream, TestMessage_fields, &msg))
+        {
+            fprintf(stderr, "Decode failed: %s\n", PB_GET_ERROR(&stream));
+            return false;
+        }
+        
+        /* Make sure it encodes back to same data */
+        {
+            uint8_t buffer2[256];
+            pb_ostream_t ostream = pb_ostream_from_buffer(buffer2, sizeof(buffer2));
+            TEST(pb_encode(&ostream, TestMessage_fields, &msg));
+            TEST(ostream.bytes_written == msgsize);
+            TEST(memcmp(buffer, buffer2, msgsize) == 0);
+        }
+        
+        /* Make sure that malloc counters work */
+        TEST(get_alloc_count() > 0);
+        
+        /* Make sure that pb_release releases everything */
+        pb_release(TestMessage_fields, &msg);
+        TEST(get_alloc_count() == 0);
+        
+        /* Check that double-free is a no-op */
+        pb_release(TestMessage_fields, &msg);
+        TEST(get_alloc_count() == 0);
+    }
+    
+    return true;
+}
+
+int main()
+{
+    if (do_test())
+        return 0;
+    else
+        return 1;
+}
+

tests/mem_release/mem_release.proto

@@ -0,0 +1,24 @@
+syntax = "proto2";
+import "nanopb.proto";
+
+message SubMessage
+{
+    optional string dynamic_str = 1 [(nanopb).type = FT_POINTER];
+    repeated string dynamic_str_arr = 2 [(nanopb).type = FT_POINTER];
+    repeated SubMessage dynamic_submsg = 3 [(nanopb).type = FT_POINTER];
+}
+
+message TestMessage
+{
+    required SubMessage static_req_submsg = 1 [(nanopb).type = FT_STATIC];
+    optional SubMessage dynamic_submsg = 2 [(nanopb).type = FT_POINTER];
+    optional SubMessage static_opt_submsg = 3 [(nanopb).type = FT_STATIC];
+    extensions 100 to 200;
+}
+
+extend TestMessage
+{
+    optional SubMessage dynamic_ext = 100 [(nanopb).type = FT_POINTER];
+    optional SubMessage static_ext = 101 [(nanopb).type = FT_STATIC];
+}
+