update to 2.3 based on netbsd stuff

[ppp.git] / ultrix / bsd-comp.c

diff --git a/ultrix/bsd-comp.c b/ultrix/bsd-comp.c
index 39d2b85df7d23e3cdfd68a1629d08f56f67435af..8246343ee37be9b046928153746f2ab93704a9e5 100644 (file)
--- a/ultrix/bsd-comp.c
+++ b/ultrix/bsd-comp.c
@@ -40,7 +40,7 @@
 /*
  * This version is for use with mbufs on Ultrix systems.
  *
- * $Id: bsd-comp.c,v 1.3 1994/12/08 00:33:31 paulus Exp $
+ * $Id: bsd-comp.c,v 1.7 1996/07/01 01:24:24 paulus Exp $
  */
 
 #include "../h/param.h"
@@ -54,6 +54,8 @@
 #define PACKETPTR      struct mbuf *
 #include "ppp-comp.h"
 
+#if DO_BSD_COMPRESS
+
 #define BSD_LITTLE_ENDIAN      /* all Ultrix machines are little-endian */
 
 /*
@@ -78,15 +80,6 @@
  *         compression is not going well.
  */
 
-/*
- * Macros to extract protocol version and number of bits
- * from the third byte of the BSD Compress CCP configuration option.
- */
-#define BSD_VERSION(x) ((x) >> 5)
-#define BSD_NBITS(x)   ((x) & 0x1F)
-
-#define BSD_CURRENT_VERSION    1
-
 /*
  * A dictionary for doing BSD compress.
  */
@@ -136,15 +129,13 @@ struct bsd_db {
 };
 
 #define BSD_OVHD       2               /* BSD compress overhead/packet */
-#define MIN_BSD_BITS   9
-#define BSD_INIT_BITS  MIN_BSD_BITS
-#define MAX_BSD_BITS   15
+#define BSD_INIT_BITS  BSD_MIN_BITS
 
 static void    *bsd_comp_alloc __P((u_char *options, int opt_len));
 static void    *bsd_decomp_alloc __P((u_char *options, int opt_len));
 static void    bsd_free __P((void *state));
 static int     bsd_comp_init __P((void *state, u_char *options, int opt_len,
-                                  int unit, int debug));
+                                  int unit, int hdrlen, int debug));
 static int     bsd_decomp_init __P((void *state, u_char *options, int opt_len,
                                     int unit, int hdrlen, int mru, int debug));
 static int     bsd_compress __P((void *state, struct mbuf **mret,
@@ -159,7 +150,7 @@ static void bsd_comp_stats __P((void *state, struct compstat *stats));
  * Procedures exported to if_ppp.c.
  */
 struct compressor ppp_bsd_compress = {
-    0x21,                      /* compress_proto */
+    CI_BSD_COMPRESS,           /* compress_proto */
     bsd_comp_alloc,            /* comp_alloc */
     bsd_free,                  /* comp_free */
     bsd_comp_init,             /* comp_init */
@@ -193,7 +184,7 @@ struct compressor ppp_bsd_compress = {
 #define LAST   255
 
 #define MAXCODE(b)     ((1 << (b)) - 1)
-#define BADCODEM1      MAXCODE(MAX_BSD_BITS);
+#define BADCODEM1      MAXCODE(BSD_MAX_BITS)
 
 #define BSD_HASH(prefix,suffix,hshift) ((((u_int32_t)(suffix)) << (hshift)) \
                                         ^ (u_int32_t)(prefix))
@@ -206,6 +197,12 @@ struct compressor ppp_bsd_compress = {
 #define RATIO_SCALE    (1<<RATIO_SCALE_LOG)
 #define RATIO_MAX      (0x7fffffff>>RATIO_SCALE_LOG)
 
+static void bsd_clear __P((struct bsd_db *));
+static int bsd_check __P((struct bsd_db *));
+static void *bsd_alloc __P((u_char *, int, int));
+static int bsd_init __P((struct bsd_db *, u_char *, int, int, int, int,
+                        int, int));
+
 /*
  * clear the dictionary
  */
@@ -327,7 +324,8 @@ bsd_alloc(options, opt_len, decomp)
     u_int newlen, hsize, hshift, maxmaxcode;
     struct bsd_db *db;
 
-    if (opt_len != 3 || options[0] != 0x21 || options[1] != 3
+    if (opt_len < CILEN_BSD_COMPRESS || options[0] != CI_BSD_COMPRESS
+       || options[1] != CILEN_BSD_COMPRESS
        || BSD_VERSION(options[2]) != BSD_CURRENT_VERSION)
        return NULL;
     bits = BSD_NBITS(options[2]);
@@ -424,7 +422,8 @@ bsd_init(db, options, opt_len, unit, hdrlen, mru, debug, decomp)
 {
     int i;
 
-    if (opt_len != 3 || options[0] != 0x21 || options[1] != 3
+    if (opt_len < CILEN_BSD_COMPRESS || options[0] != CI_BSD_COMPRESS
+       || options[1] != CILEN_BSD_COMPRESS
        || BSD_VERSION(options[2]) != BSD_CURRENT_VERSION
        || BSD_NBITS(options[2]) != db->maxbits
        || decomp && db->lens == NULL)
@@ -455,13 +454,13 @@ bsd_init(db, options, opt_len, unit, hdrlen, mru, debug, decomp)
 }
 
 static int
-bsd_comp_init(state, options, opt_len, unit, debug)
+bsd_comp_init(state, options, opt_len, unit, hdrlen, debug)
     void *state;
     u_char *options;
-    int opt_len, unit, debug;
+    int opt_len, unit, hdrlen, debug;
 {
     return bsd_init((struct bsd_db *) state, options, opt_len,
-                   unit, 0, 0, debug, 0);
+                   unit, hdrlen, 0, debug, 0);
 }
 
 static int
@@ -501,7 +500,7 @@ bsd_compress(state, mret, mp, slen, maxolen)
     u_char *rptr, *wptr;
     u_char *cp_end;
     int olen;
-    struct mbuf *m, **mnp, *clp;
+    struct mbuf *m, *clp;
        
 #define PUTBYTE(v) {                                   \
     ++olen;                                            \
@@ -555,9 +554,10 @@ bsd_compress(state, mret, mp, slen, maxolen)
     MGET(m, M_DONTWAIT, MT_DATA);
     *mret = m;
     if (m != NULL) {
-       if (maxolen > MLEN) {
+       if (maxolen + db->hdrlen > MLEN) {
            MCLGET(m, clp);
        }
+       m->m_off += db->hdrlen;
        m->m_len = 0;
        wptr = mtod(m, u_char *);
        cp_end = wptr + M_TRAILINGSPACE(m);
@@ -727,7 +727,6 @@ bsd_incomp(state, dmsg)
     if (ent < 0x21 || ent > 0xf9)
        return;
 
-    db->incomp_count++;
     db->seqno++;
     ilen = 1;          /* count the protocol as 1 byte */
     rptr += PPP_HDRLEN;
@@ -848,7 +847,7 @@ bsd_decompress(state, cmp, dmpp)
     struct mbuf *m, *dmp, *mret;
     int adrs, ctrl, ilen;
     int space, codelen, extra;
-    struct mbuf *last, *clp;
+    struct mbuf *clp;
 
     /*
      * Save the address/control from the PPP header
@@ -877,12 +876,13 @@ bsd_decompress(state, cmp, dmpp)
      * Check the sequence number and give up if it differs from
      * the value we're expecting.
      */
-    if (seq != db->seqno++) {
+    if (seq != db->seqno) {
        if (db->debug)
            printf("bsd_decomp%d: bad sequence # %d, expected %d\n",
                   db->unit, seq, db->seqno - 1);
        return DECOMP_ERROR;
     }
+    ++db->seqno;
 
     /*
      * Allocate one mbuf to start with.
@@ -1129,3 +1129,4 @@ bsd_decompress(state, cmp, dmpp)
     return DECOMP_FATALERROR;
 #endif /* DEBUG */
 }
+#endif /* DO_BSD_COMPRESS */