Add a test for the backwards compatibility of generated files.

It is not necessary to maintain full compatibility of generated files
for all of eternity, but this test will warn us if there is
a need to regenerate the files.

1 files changed, 197 insertions, 0 deletions

diff --git a/tests/bc_decode.c b/tests/bc_decode.c
new file mode 100644
index 00000000..b74172fd
--- /dev/null
+++ b/tests/bc_decode.c
@@ -0,0 +1,197 @@
+/* Tests the decoding of all types.
+ * This is a backwards-compatibility test, using bc_alltypes.pb.h.
+ * It is similar to test_decode3, but duplicated in order to allow
+ * test_decode3 to test any new features introduced later.
+ *
+ * Run e.g. ./bc_encode | ./bc_decode
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <pb_decode.h>
+#include "bc_alltypes.pb.h"
+
+#define TEST(x) if (!(x)) { \
+    printf("Test " #x " failed.\n"); \
+    return false; \
+    }
+
+/* This function is called once from main(), it handles
+   the decoding and checks the fields. */
+bool check_alltypes(pb_istream_t *stream, int mode)
+{
+    AllTypes alltypes;
+    
+    /* Fill with garbage to better detect initialization errors */
+    memset(&alltypes, 0xAA, sizeof(alltypes));
+    
+    if (!pb_decode(stream, AllTypes_fields, &alltypes))
+        return false;
+    
+    TEST(alltypes.req_int32         == -1001);
+    TEST(alltypes.req_int64         == -1002);
+    TEST(alltypes.req_uint32        == 1003);
+    TEST(alltypes.req_uint64        == 1004);
+    TEST(alltypes.req_sint32        == -1005);
+    TEST(alltypes.req_sint64        == -1006);
+    TEST(alltypes.req_bool          == true);
+    
+    TEST(alltypes.req_fixed32       == 1008);
+    TEST(alltypes.req_sfixed32      == -1009);
+    TEST(alltypes.req_float         == 1010.0f);
+    
+    TEST(alltypes.req_fixed64       == 1011);
+    TEST(alltypes.req_sfixed64      == -1012);
+    TEST(alltypes.req_double        == 1013.0f);
+    
+    TEST(strcmp(alltypes.req_string, "1014") == 0);
+    TEST(alltypes.req_bytes.size == 4);
+    TEST(memcmp(alltypes.req_bytes.bytes, "1015", 4) == 0);
+    TEST(strcmp(alltypes.req_submsg.substuff1, "1016") == 0);
+    TEST(alltypes.req_submsg.substuff2 == 1016);
+    TEST(alltypes.req_submsg.substuff3 == 3);
+    TEST(alltypes.req_enum == MyEnum_Truth);
+    
+    TEST(alltypes.rep_int32_count == 5 && alltypes.rep_int32[4] == -2001 && alltypes.rep_int32[0] == 0);
+    TEST(alltypes.rep_int64_count == 5 && alltypes.rep_int64[4] == -2002 && alltypes.rep_int64[0] == 0);
+    TEST(alltypes.rep_uint32_count == 5 && alltypes.rep_uint32[4] == 2003 && alltypes.rep_uint32[0] == 0);
+    TEST(alltypes.rep_uint64_count == 5 && alltypes.rep_uint64[4] == 2004 && alltypes.rep_uint64[0] == 0);
+    TEST(alltypes.rep_sint32_count == 5 && alltypes.rep_sint32[4] == -2005 && alltypes.rep_sint32[0] == 0);
+    TEST(alltypes.rep_sint64_count == 5 && alltypes.rep_sint64[4] == -2006 && alltypes.rep_sint64[0] == 0);
+    TEST(alltypes.rep_bool_count == 5 && alltypes.rep_bool[4] == true && alltypes.rep_bool[0] == false);
+    
+    TEST(alltypes.rep_fixed32_count == 5 && alltypes.rep_fixed32[4] == 2008 && alltypes.rep_fixed32[0] == 0);
+    TEST(alltypes.rep_sfixed32_count == 5 && alltypes.rep_sfixed32[4] == -2009 && alltypes.rep_sfixed32[0] == 0);
+    TEST(alltypes.rep_float_count == 5 && alltypes.rep_float[4] == 2010.0f && alltypes.rep_float[0] == 0.0f);
+    
+    TEST(alltypes.rep_fixed64_count == 5 && alltypes.rep_fixed64[4] == 2011 && alltypes.rep_fixed64[0] == 0);
+    TEST(alltypes.rep_sfixed64_count == 5 && alltypes.rep_sfixed64[4] == -2012 && alltypes.rep_sfixed64[0] == 0);
+    TEST(alltypes.rep_double_count == 5 && alltypes.rep_double[4] == 2013.0 && alltypes.rep_double[0] == 0.0);
+    
+    TEST(alltypes.rep_string_count == 5 && strcmp(alltypes.rep_string[4], "2014") == 0 && alltypes.rep_string[0][0] == '\0');
+    TEST(alltypes.rep_bytes_count == 5 && alltypes.rep_bytes[4].size == 4 && alltypes.rep_bytes[0].size == 0);
+    TEST(memcmp(alltypes.rep_bytes[4].bytes, "2015", 4) == 0);
+
+    TEST(alltypes.rep_submsg_count == 5);
+    TEST(strcmp(alltypes.rep_submsg[4].substuff1, "2016") == 0 && alltypes.rep_submsg[0].substuff1[0] == '\0');
+    TEST(alltypes.rep_submsg[4].substuff2 == 2016 && alltypes.rep_submsg[0].substuff2 == 0);
+    TEST(alltypes.rep_submsg[4].substuff3 == 2016 && alltypes.rep_submsg[0].substuff3 == 3);
+    
+    TEST(alltypes.rep_enum_count == 5 && alltypes.rep_enum[4] == MyEnum_Truth && alltypes.rep_enum[0] == MyEnum_Zero);
+    
+    if (mode == 0)
+    {
+        /* Expect default values */
+        TEST(alltypes.has_opt_int32     == false);
+        TEST(alltypes.opt_int32         == 4041);
+        TEST(alltypes.has_opt_int64     == false);
+        TEST(alltypes.opt_int64         == 4042);
+        TEST(alltypes.has_opt_uint32    == false);
+        TEST(alltypes.opt_uint32        == 4043);
+        TEST(alltypes.has_opt_uint64    == false);
+        TEST(alltypes.opt_uint64        == 4044);
+        TEST(alltypes.has_opt_sint32    == false);
+        TEST(alltypes.opt_sint32        == 4045);
+        TEST(alltypes.has_opt_sint64    == false);
+        TEST(alltypes.opt_sint64        == 4046);
+        TEST(alltypes.has_opt_bool      == false);
+        TEST(alltypes.opt_bool          == false);
+        
+        TEST(alltypes.has_opt_fixed32   == false);
+        TEST(alltypes.opt_fixed32       == 4048);
+        TEST(alltypes.has_opt_sfixed32  == false);
+        TEST(alltypes.opt_sfixed32      == 4049);
+        TEST(alltypes.has_opt_float     == false);
+        TEST(alltypes.opt_float         == 4050.0f);
+        
+        TEST(alltypes.has_opt_fixed64   == false);
+        TEST(alltypes.opt_fixed64       == 4051);
+        TEST(alltypes.has_opt_sfixed64  == false);
+        TEST(alltypes.opt_sfixed64      == 4052);
+        TEST(alltypes.has_opt_double    == false);
+        TEST(alltypes.opt_double        == 4053.0);
+        
+        TEST(alltypes.has_opt_string    == false);
+        TEST(strcmp(alltypes.opt_string, "4054") == 0);
+        TEST(alltypes.has_opt_bytes     == false);
+        TEST(alltypes.opt_bytes.size == 4);
+        TEST(memcmp(alltypes.opt_bytes.bytes, "4055", 4) == 0);
+        TEST(alltypes.has_opt_submsg    == false);
+        TEST(strcmp(alltypes.opt_submsg.substuff1, "1") == 0);
+        TEST(alltypes.opt_submsg.substuff2 == 2);
+        TEST(alltypes.opt_submsg.substuff3 == 3);
+        TEST(alltypes.has_opt_enum     == false);
+        TEST(alltypes.opt_enum == MyEnum_Second);
+    }
+    else
+    {
+        /* Expect filled-in values */
+        TEST(alltypes.has_opt_int32     == true);
+        TEST(alltypes.opt_int32         == 3041);
+        TEST(alltypes.has_opt_int64     == true);
+        TEST(alltypes.opt_int64         == 3042);
+        TEST(alltypes.has_opt_uint32    == true);
+        TEST(alltypes.opt_uint32        == 3043);
+        TEST(alltypes.has_opt_uint64    == true);
+        TEST(alltypes.opt_uint64        == 3044);
+        TEST(alltypes.has_opt_sint32    == true);
+        TEST(alltypes.opt_sint32        == 3045);
+        TEST(alltypes.has_opt_sint64    == true);
+        TEST(alltypes.opt_sint64        == 3046);
+        TEST(alltypes.has_opt_bool      == true);
+        TEST(alltypes.opt_bool          == true);
+        
+        TEST(alltypes.has_opt_fixed32   == true);
+        TEST(alltypes.opt_fixed32       == 3048);
+        TEST(alltypes.has_opt_sfixed32  == true);
+        TEST(alltypes.opt_sfixed32      == 3049);
+        TEST(alltypes.has_opt_float     == true);
+        TEST(alltypes.opt_float         == 3050.0f);
+        
+        TEST(alltypes.has_opt_fixed64   == true);
+        TEST(alltypes.opt_fixed64       == 3051);
+        TEST(alltypes.has_opt_sfixed64  == true);
+        TEST(alltypes.opt_sfixed64      == 3052);
+        TEST(alltypes.has_opt_double    == true);
+        TEST(alltypes.opt_double        == 3053.0);
+        
+        TEST(alltypes.has_opt_string    == true);
+        TEST(strcmp(alltypes.opt_string, "3054") == 0);
+        TEST(alltypes.has_opt_bytes     == true);
+        TEST(alltypes.opt_bytes.size == 4);
+        TEST(memcmp(alltypes.opt_bytes.bytes, "3055", 4) == 0);
+        TEST(alltypes.has_opt_submsg    == true);
+        TEST(strcmp(alltypes.opt_submsg.substuff1, "3056") == 0);
+        TEST(alltypes.opt_submsg.substuff2 == 3056);
+        TEST(alltypes.opt_submsg.substuff3 == 3);
+        TEST(alltypes.has_opt_enum      == true);
+        TEST(alltypes.opt_enum == MyEnum_Truth);
+    }
+    
+    TEST(alltypes.end == 1099);
+    
+    return true;
+}
+
+int main(int argc, char **argv)
+{
+    /* Whether to expect the optional values or the default values. */
+    int mode = (argc > 1) ? atoi(argv[1]) : 0;
+    
+    /* Read the data into buffer */
+    uint8_t buffer[1024];
+    size_t count = fread(buffer, 1, sizeof(buffer), stdin);
+    
+    /* Construct a pb_istream_t for reading from the buffer */
+    pb_istream_t stream = pb_istream_from_buffer(buffer, count);
+    
+    /* Decode and print out the stuff */
+    if (!check_alltypes(&stream, mode))
+    {
+        printf("Parsing failed: %s\n", PB_GET_ERROR(&stream));
+        return 1;
+    } else {
+        return 0;
+    }
+}