Use uint64_t for string length in decode_string

include/rive/core/reader.h

diff --git a/include/rive/core/reader.h b/include/rive/core/reader.h
index 82eb80f..1779cc0 100644
--- a/include/rive/core/reader.h
+++ b/include/rive/core/reader.h
@@ -33,7 +33,7 @@
 /* Decodes a string
  */
 inline size_t
-decode_string(uint8_t str_len, const uint8_t* buf, const uint8_t* buf_end, char* char_buf) {
+decode_string(uint64_t str_len, const uint8_t* buf, const uint8_t* buf_end, char* char_buf) {
     // Return zero bytes read on buffer overflow
     if (buf_end - buf < str_len) {
         return 0;

test/assets/long_name.riv

diff --git a/test/assets/long_name.riv b/test/assets/long_name.riv
new file mode 100644
index 0000000..8dda98b
--- /dev/null
+++ b/test/assets/long_name.riv
Binary files differ

test/file_test.cpp

diff --git a/test/file_test.cpp b/test/file_test.cpp
index 4a0a99f..05d0e5e 100644
--- a/test/file_test.cpp
+++ b/test/file_test.cpp
@@ -111,6 +111,14 @@
     REQUIRE(world[5] == 29.535156f);
 }
 
+TEST_CASE("long name in object is parsed correctly", "[file]") {
+    auto file = ReadRiveFile("../../test/assets/long_name.riv");
+    auto artboard = file->artboard();
+
+    // Expect all object in file to be loaded, in this case 7
+    REQUIRE(artboard->objects().size() == 7);
+}
+
 // TODO:
 // ShapePaint (fill/stroke) needs to be implemented in WASM (jsFill/jsStroke) in
 // order to create Paint objects as necessary.