Add InternalUtils for array length checking to match Java

diff --git a/typescript_strings.py b/typescript_strings.py
index 379eaa6bd3f48c58421153c9e1c86307a2fd43c4..a1dcf813bc41ef168124f3c422242b849b1bf572 100644 (file)
--- a/typescript_strings.py
+++ b/typescript_strings.py
@@ -297,6 +297,7 @@ void __attribute__((visibility("default"))) TS_free(uint32_t ptr) {
         self.hu_struct_file_prefix = """
 import CommonBase from './CommonBase.mjs';
 import * as bindings from '../bindings.mjs'
+import * as InternalUtils from '../InternalUtils.mjs'
 
 """
         self.c_fn_ty_pfx = ""
@@ -308,6 +309,12 @@ import * as bindings from '../bindings.mjs'
         self.is_arr_some_check = ("", " != 0")
         self.get_native_arr_len_call = ("", "->arr_len")
 
+        with open(outdir + "/InternalUtils.mts", "w") as f:
+            f.write("export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {\n")
+            f.write("\tif (arr.length != len) { throw new Error(\"Expected array of length \" + len + \"got \" + arr.length); }\n")
+            f.write("\treturn arr;\n")
+            f.write("}")
+
     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
         return None
     def create_native_arr_call(self, arr_len, ty_info):