Gracefully handle payloads >2GB.

PiperOrigin-RevId: 892497477

Author: haberman

ruby/ext/google/protobuf_c/message.c

@@ -978,7 +978,7 @@ static VALUE Message_decode(int argc, VALUE* argv, VALUE klass) {
                               klass, /*freeze*/ false);
 }
 
-VALUE Message_decode_bytes(int size, const char* bytes, int options,
+VALUE Message_decode_bytes(size_t size, const char* bytes, int options,
                            VALUE klass, bool freeze) {
   VALUE msg_rb = initialize_rb_class_with_no_args(klass);
   Message* msg = ruby_to_Message(msg_rb);

ruby/ext/google/protobuf_c/message.h

@@ -70,7 +70,7 @@ VALUE build_module_from_enumdesc(VALUE _enumdesc);
 VALUE MessageOrEnum_GetDescriptor(VALUE klass);
 
 // Decodes a Message from a byte sequence.
-VALUE Message_decode_bytes(int size, const char* bytes, int options,
+VALUE Message_decode_bytes(size_t size, const char* bytes, int options,
                            VALUE klass, bool freeze);
 
 // Recursively freeze message

ruby/tests/encode_decode_test.rb

@@ -214,4 +214,17 @@ def test_encode_depth_limit
     assert_match msg.to_json, msg_out.to_json
   end
 
+  def test_decode_2gb_payload_without_crashing
+    # Skip if JRuby
+    omit "JRuby cannot create strings >= 2GB" if defined?(JRUBY_VERSION)
+
+    # 2. Skip 32-bit: Address space cannot hold a 2GB string + overhead
+    omit "Cannot test 2GB+ payloads on 32-bit systems" if 0.size <= 4
+
+    payload = "A" * (2**31)
+    assert_raises Google::Protobuf::ParseError do
+      A::B::C::TestMessage.decode(payload)
+    end
+  end
+
 end