Index: /trunk/include/iprt/zip.h
===================================================================
--- /trunk/include/iprt/zip.h	(revision 84202)
+++ /trunk/include/iprt/zip.h	(revision 84203)
@@ -311,5 +311,5 @@
  *                              another one is retained.
  * @param   enmFormat           The desired output format.
- * @param   fFlags              RTZIPTAR_C_XXX.
+ * @param   fFlags              RTZIPTAR_C_XXX, except RTZIPTAR_C_UPDATE.
  * @param   phVfsFss            Where to return the handle to the TAR
  *                              filesystem stream.
@@ -331,4 +331,21 @@
 
 /**
+ * Opens a TAR filesystem stream for the purpose of create a new TAR archive or
+ * updating an existing one.
+ *
+ * @returns IPRT status code.
+ *
+ * @param   hVfsFileOut         The TAR file handle, i.e. where the tar stuff is
+ *                              written and optionally read/update.  The
+ *                              reference is not consumed, instead another one
+ *                              is retained.
+ * @param   enmFormat           The desired output format.
+ * @param   fFlags              RTZIPTAR_C_XXX.
+ * @param   phVfsFss            Where to return the handle to the TAR
+ *                              filesystem stream.
+ */
+RTDECL(int) RTZipTarFsStreamForFile(RTVFSFILE hVfsFile, RTZIPTARFORMAT enmFormat, uint32_t fFlags, PRTVFSFSSTREAM phVfsFss);
+
+/**
  * Set the owner to store the archive entries with.
  *