-typedef int avwCallbackIoRead(void *, uint8_t *, int);\r
-typedef int64_t avwCallbackIoSeek(void *, int64_t, int);\r
-typedef int64_t avwCallbackIoSeekSize(void *);\r
+typedef int avwCallbackIoRead(void *, unsigned char *, int);\r
+typedef fs_offset_t avwCallbackIoSeek(void *, fs_offset_t, int);\r
+typedef fs_offset_t avwCallbackIoSeekSize(void *);\r