1 files changed, 81 insertions, 0 deletions
diff --git a/comm/third_party/asn1js/src/internals/utils.ts b/comm/third_party/asn1js/src/internals/utils.ts
new file mode 100644
index 0000000000..84d1f3164f
--- /dev/null
+++ b/comm/third_party/asn1js/src/internals/utils.ts
@@ -0,0 +1,81 @@
+// Utility functions
+
+import type { LocalBaseBlock } from "./LocalBaseBlock";
+
+/**
+ * Throws an exception if BigInt is not supported
+ * @throws Throws Error if BigInt is not supported
+ */
+export function assertBigInt(): void {
+  if (typeof BigInt === "undefined") {
+    throw new Error("BigInt is not defined. Your environment doesn't implement BigInt.");
+  }
+}
+
+/**
+ * Concatenates buffers from the list
+ * @param buffers List of buffers
+ * @returns Concatenated buffer
+ */
+export function concat(buffers: ArrayBuffer[]): ArrayBuffer {
+  let outputLength = 0;
+  let prevLength = 0;
+
+  // Calculate output length
+  for (let i = 0; i < buffers.length; i++) {
+    const buffer = buffers[i];
+    outputLength += buffer.byteLength;
+  }
+
+  const retView = new Uint8Array(outputLength);
+
+  for (let i = 0; i < buffers.length; i++) {
+    const buffer = buffers[i];
+    retView.set(new Uint8Array(buffer), prevLength);
+    prevLength += buffer.byteLength;
+  }
+
+  return retView.buffer;
+}
+
+/**
+ * Check input "Uint8Array" for common functions
+ * @param baseBlock
+ * @param inputBuffer
+ * @param inputOffset
+ * @param inputLength
+ * @returns
+ */
+export function checkBufferParams(baseBlock: LocalBaseBlock, inputBuffer: Uint8Array, inputOffset: number, inputLength: number): boolean {
+  if (!(inputBuffer instanceof Uint8Array)) {
+    baseBlock.error = "Wrong parameter: inputBuffer must be 'Uint8Array'";
+
+    return false;
+  }
+
+  if (!inputBuffer.byteLength) {
+    baseBlock.error = "Wrong parameter: inputBuffer has zero length";
+
+    return false;
+  }
+
+  if (inputOffset < 0) {
+    baseBlock.error = "Wrong parameter: inputOffset less than zero";
+
+    return false;
+  }
+
+  if (inputLength < 0) {
+    baseBlock.error = "Wrong parameter: inputLength less than zero";
+
+    return false;
+  }
+
+  if ((inputBuffer.byteLength - inputOffset - inputLength) < 0) {
+    baseBlock.error = "End of input reached before message was fully decoded (inconsistent offset and length values)";
+
+    return false;
+  }
+
+  return true;
+}
+\ No newline at end of file