diff --git a/minadbd/fuse_adb_provider.h b/minadbd/fuse_adb_provider.h
index 23de44a..b88ce49 100644
--- a/minadbd/fuse_adb_provider.h
+++ b/minadbd/fuse_adb_provider.h
@@ -17,10 +17,21 @@
 #ifndef __FUSE_ADB_PROVIDER_H
 #define __FUSE_ADB_PROVIDER_H
 
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+struct adb_data {
+    int sfd;  // file descriptor for the adb channel
+
+    uint64_t file_size;
+    uint32_t block_size;
+};
+
+int read_block_adb(void* cookie, uint32_t block, uint8_t* buffer,
+                   uint32_t fetch_size);
 int run_adb_fuse(int sfd, uint64_t file_size, uint32_t block_size);
 
 #ifdef __cplusplus