* packet.h, free-packet.c (free_encrypted, free_plaintext), parse-packet.c

(copy_packet, skip_packet, skip_rest, read_rest, parse_plaintext,
parse_encrypted, parse_gpg_control): Use a flag to indicate partial or
indeterminate encoding.  This is the first step in some minor surgery to
remove the old gpg partial length encoding.

g10/packet.h

@@ -279,6 +279,7 @@ typedef struct {
     u32  len;		  /* length of encrypted data */
     int  extralen;        /* this is (blocksize+2) */
     byte new_ctb;	  /* uses a new CTB */
+    byte is_partial;      /* partial length encoded */
     byte mdc_method;	  /* > 0: integrity protected encrypted data packet */
     IOBUF buf;		  /* IOBUF reference */
 } PKT_encrypted;