diff --git a/fastbootd/utils.h b/fastbootd/utils.h
index a553a25..c714786 100644
--- a/fastbootd/utils.h
+++ b/fastbootd/utils.h
@@ -42,6 +42,9 @@
 uint64_t get_file_size(int fd);
 uint64_t get_block_device_size(int fd);
 int wipe_block_device(int fd, int64_t len);
+int create_temp_file();
+ssize_t bulk_read(int bulk_out, char *buf, size_t length);
+ssize_t bulk_write(int bulk_in, const char *buf, size_t length);
 
 #define ROUND_TO_PAGE(address,pagesize) ((address + pagesize - 1) & (~(pagesize - 1)))