pmt: add memory test function and some new functions to libhelper

srclib/libhelper/src/Classes.cpp

@@ -95,6 +95,8 @@ garbageCollector::~garbageCollector() {
     close(fd);
   for (const auto &fp : _fps)
     fclose(fp);
+  for (const auto &file: _files)
+    eraseEntry(file);
 }
 
 void garbageCollector::delAfterProgress(char *&_ptr) {
@@ -103,6 +105,9 @@ void garbageCollector::delAfterProgress(char *&_ptr) {
 void garbageCollector::delAfterProgress(uint8_t *&_ptr) {
   _ptrs_u.push_back(_ptr);
 }
+void garbageCollector::delFileAfterProgress(const std::string_view path) {
+  _files.push_back(path);
+}
 void garbageCollector::closeAfterProgress(const int _fd) {
   _fds.push_back(_fd);
 }

srclib/libhelper/src/Utilities.cpp

@@ -216,5 +216,11 @@ bool reboot(const std::string_view arg) {
   return android_reboot(cmd, 0, arg.empty() ? nullptr : arg.data()) != -1;
 }
 
+uint64_t getRandomOffset(const uint64_t size, const uint64_t bufferSize) {
+  if (size <= bufferSize) return 0;
+  const uint64_t maxOffset = size - bufferSize;
+  return rand() % maxOffset;
+}
+
 std::string getLibVersion() { MKVERSION("libhelper"); }
 } // namespace Helper