Fix maximum encoded size for negative enums (issue #166).

3 files changed, 72 insertions, 0 deletions

diff --git a/tests/regression/issue_166/SConscript b/tests/regression/issue_166/SConscript
new file mode 100644
index 00000000..c50b9193
--- /dev/null
+++ b/tests/regression/issue_166/SConscript
@@ -0,0 +1,13 @@
+# Verify that the maximum encoded size is calculated properly
+# for enums.
+
+Import('env')
+
+env.NanopbProto('enums')
+
+p = env.Program(["enum_encoded_size.c",
+                 "enums.pb.c",
+                 "$COMMON/pb_encode.o",
+                 "$COMMON/pb_common.o"])
+env.RunTest(p)
+
diff --git a/tests/regression/issue_166/enum_encoded_size.c b/tests/regression/issue_166/enum_encoded_size.c
new file mode 100644
index 00000000..84e1c7de
--- /dev/null
+++ b/tests/regression/issue_166/enum_encoded_size.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <string.h>
+#include <pb_encode.h>
+#include "unittests.h"
+#include "enums.pb.h"
+
+int main()
+{
+    int status = 0;
+    
+    uint8_t buf[256];
+    SignedMsg msg1;
+    UnsignedMsg msg2;
+    pb_ostream_t s;
+    
+    {
+        COMMENT("Test negative value of signed enum");
+        /* Negative value should take up the maximum size */
+        msg1.value = SignedEnum_SE_MIN;
+        s = pb_ostream_from_buffer(buf, sizeof(buf));
+        TEST(pb_encode(&s, SignedMsg_fields, &msg1));
+        TEST(s.bytes_written == SignedMsg_size);
+        
+        COMMENT("Test positive value of signed enum");
+        /* Positive value should be smaller */
+        msg1.value = SignedEnum_SE_MAX;
+        s = pb_ostream_from_buffer(buf, sizeof(buf));
+        TEST(pb_encode(&s, SignedMsg_fields, &msg1));
+        TEST(s.bytes_written < SignedMsg_size);
+    }
+    
+    {
+        COMMENT("Test positive value of unsigned enum");
+        /* This should take up the maximum size */
+        msg2.value = UnsignedEnum_UE_MAX;
+        s = pb_ostream_from_buffer(buf, sizeof(buf));
+        TEST(pb_encode(&s, UnsignedMsg_fields, &msg2));
+        TEST(s.bytes_written == UnsignedMsg_size);
+    }
+    
+    return status;
+}
+
diff --git a/tests/regression/issue_166/enums.proto b/tests/regression/issue_166/enums.proto
new file mode 100644
index 00000000..a0964ab4
--- /dev/null
+++ b/tests/regression/issue_166/enums.proto
@@ -0,0 +1,16 @@
+enum SignedEnum {
+    SE_MIN = -1;
+    SE_MAX = 255;
+}
+
+enum UnsignedEnum {
+    UE_MAX = 65536;
+}
+
+message SignedMsg {
+    required SignedEnum value = 1;
+}
+
+message UnsignedMsg {
+    required UnsignedEnum value = 1;
+}