Make source seek/tell functions public.
diff --git a/lib/zip.h b/lib/zip.h
index aa9b683..67ef791 100644
--- a/lib/zip.h
+++ b/lib/zip.h
@@ -391,8 +391,12 @@
ZIP_EXTERN int zip_source_open(zip_source_t *);
ZIP_EXTERN zip_int64_t zip_source_read(zip_source_t *, void *, zip_uint64_t);
ZIP_EXTERN void zip_source_rollback_write(zip_source_t *);
+ZIP_EXTERN int zip_source_seek(zip_source_t *, zip_int64_t, int);
ZIP_EXTERN zip_int64_t zip_source_seek_compute_offset(zip_uint64_t, zip_uint64_t, void *, zip_uint64_t, zip_error_t *);
+ZIP_EXTERN int zip_source_seek_write(zip_source_t *, zip_int64_t, int);
ZIP_EXTERN int zip_source_stat(zip_source_t *, zip_stat_t *);
+ZIP_EXTERN zip_int64_t zip_source_tell(zip_source_t *);
+ZIP_EXTERN zip_int64_t zip_source_tell_write(zip_source_t *);
ZIP_EXTERN zip_int64_t zip_source_write(zip_source_t *, const void *, zip_uint64_t);
ZIP_EXTERN zip_source_t *zip_source_zip(zip_t *, zip_t *, zip_uint64_t, zip_flags_t, zip_uint64_t, zip_int64_t);
ZIP_EXTERN int zip_stat(zip_t *, const char *, zip_flags_t, zip_stat_t *);