int fd = open("/path/to/file", O_RDONLY); off_t offset = 0; size_t size = 1024; Parcel parcel; bool success = parcel.readFileDescriptor(fd, offset, size); if (success) { // data read successfully from file descriptor and written to Parcel object } else { // error occurred while reading from file descriptor }In this example, the function opens a file at the specified path in read-only mode, and then reads the first 1024 bytes of data from the file starting at offset 0. The data is then written to a Parcel object using the readFileDescriptor function, and the function returns a boolean indicating whether the operation was successful or not. The package or library to which the Parcel class belongs, varies based on the context of the code being written. It seems to be a part of the Android system libraries as an IPC (Inter Process Communication) mechanism.