Fix bug with large extension field numbers.

Previously, extensions with field numbers greater than 268435455 would
result in a compile time error in generated code that looks something
like this:

Foo.java:3178: error: integer number too large: 3346754610
                3346754610);

This is because we were trying to represent the tag number (an
unsigned int) using a java int constant, but java int constants are
signed, and can't exceed Integer.MAX_VALUE.

Fixed by declaring it as a long instead, and casting it down to an
int in the implementation. This is safe, because the tag value always
fits in 32 bis.

Change-Id: If2017bacb4e20af667eaeaf9b65ddc2c30a7709f

1 files changed, 3 insertions, 0 deletions

diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto
index 2a678a80..d1c5766d 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto
+++ b/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto
@@ -21,6 +21,9 @@ message AnotherMessage {
 message ContainerMessage {
   extend ExtendableMessage {
     optional bool another_thing = 100;
+    // The largest permitted field number, per
+    // https://developers.google.com/protocol-buffers/docs/proto#simple
+    optional bool large_field_number = 536870911;
   }
 }