if (this.byteCount > bufferIndex - start) {
            try {
                // Attempt to read nativeFileSystem, but don't fail if there are issues
                final int fsLen = this.byteCount - (bufferIndex - start);
                if (fsLen > 0 && fsLen < 256) { // Sanity check on length
                    this.nativeFileSystem = readString(buffer, bufferIndex);