WIP: bytes2hexstring

Author: RaoulSchaffranek

runtime/strings/bytes.cpp

@@ -162,6 +162,21 @@ SortBytes hook_BYTES_string2bytes(SortString s) {
   return hook_BYTES_bytes2string(s);
 }
 
+string *bytes2hexstring(string *b, size_t len) {
+  static const char hexchars[] = "0123456789abcdef";
+  auto *result = static_cast<string *>(kore_alloc_token(sizeof(string) + len * 2));
+  for (size_t i = 0; i < len; i++) {
+    result->data[i * 2] = hexchars[(b->data[i] >> 4) & 0xf];
+    result->data[i * 2 + 1] = hexchars[b->data[i] & 0xf];
+  }
+  init_with_len(result, len * 2);
+  return result;
+}
+
+SortString hook_BYTES_bytes2hexstring(SortBytes b) {
+  return bytes2hexstring(b, len(b));
+}
+
 SortBytes hook_BYTES_substr(SortBytes input, SortInt start, SortInt end) {
   uint64_t ustart = GET_UI(start);
   uint64_t uend = GET_UI(end);

unittests/runtime-strings/bytestest.cpp

@@ -20,6 +20,7 @@ mpz_ptr
 hook_BYTES_bytes2int(string *b, uint64_t endianness, uint64_t signedness);
 string *hook_BYTES_int2bytes(mpz_t len, mpz_t i, uint64_t endianness);
 string *hook_BYTES_bytes2string(string *b);
+string *hook_BYTES_bytes2hexstring(string *b);
 string *hook_BYTES_string2bytes(string *s);
 string *hook_BYTES_substr(string *b, mpz_t start, mpz_t end);
 string *hook_BYTES_replaceAt(string *b, mpz_t start, string *b2);
@@ -171,6 +172,19 @@ BOOST_AUTO_TEST_CASE(bytes2string) {
   BOOST_CHECK_EQUAL(0, memcmp(_1234->data, "1234", 4));
 }
 
+BOOST_AUTO_TEST_CASE(bytes2hexstring) {
+  auto empty = make_string("");
+  auto res = hook_BYTES_bytes2hexstring(empty);
+  BOOST_CHECK(res != empty);
+  BOOST_CHECK_EQUAL(len(res), 0);
+
+  auto _00ff = make_string("\x00\xff", 2);
+  res = hook_BYTES_bytes2hexstring(_00ff);
+  BOOST_CHECK(res != _00ff);
+  BOOST_CHECK_EQUAL(len(res), 4);
+  BOOST_CHECK_EQUAL(0, memcmp(res->data, "00ff", 4));
+}
+
 BOOST_AUTO_TEST_CASE(string2bytes) {
   auto empty = make_string("");
   auto res = hook_BYTES_string2bytes(empty);