added prototypes, removed unused variables

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

diff --git a/ultrix/bsd-comp.c b/ultrix/bsd-comp.c
index 5fb7312ba9a2d27d5ce50dd7bc186d50edb55379..12bca928f04c3b5220b8e16c41cf82396ea9382c 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.
  *
 /*
  * This version is for use with mbufs on Ultrix systems.
  *

- * $Id: bsd-comp.c,v 1.2 1994/11/28 01:41:29 paulus Exp $
+ * $Id: bsd-comp.c,v 1.6 1996/01/18 03:13:09 paulus Exp $

  */
 
 #include "../h/param.h"
  */
 
 #include "../h/param.h"


@@ -54,6 +54,10 @@
 #define PACKETPTR      struct mbuf *
 #include "ppp-comp.h"
 
 #define PACKETPTR      struct mbuf *
 #include "ppp-comp.h"
 

+#if DO_BSD_COMPRESS
+
+#define BSD_LITTLE_ENDIAN      /* all Ultrix machines are little-endian */
+

 /*
  * PPP "BSD compress" compression
  *  The differences between this compression and the classic BSD LZW
 /*
  * PPP "BSD compress" compression
  *  The differences between this compression and the classic BSD LZW


@@ -76,15 +80,6 @@
  *         compression is not going well.
  */
 
  *         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.
  */
 /*
  * A dictionary for doing BSD compress.
  */


@@ -97,6 +92,7 @@ struct bsd_db {
     u_char  debug;
     u_char  unit;
     u_short seqno;                     /* sequence # of next packet */
     u_char  debug;
     u_char  unit;
     u_short seqno;                     /* sequence # of next packet */

+    u_int   hdrlen;                    /* header length to preallocate */

     u_int   mru;
     u_int   maxmaxcode;                        /* largest valid code */
     u_int   max_ent;                   /* largest code in use */
     u_int   mru;
     u_int   maxmaxcode;                        /* largest valid code */
     u_int   max_ent;                   /* largest code in use */


@@ -116,7 +112,7 @@ struct bsd_db {
        union {                         /* hash value */
            u_int32_t   fcode;
            struct {
        union {                         /* hash value */
            u_int32_t   fcode;
            struct {

-#if BYTE_ORDER == LITTLE_ENDIAN
+#ifdef BSD_LITTLE_ENDIAN

                u_short prefix;         /* preceding code */
                u_char  suffix;         /* last character of new code */
                u_char  pad;
                u_short prefix;         /* preceding code */
                u_char  suffix;         /* last character of new code */
                u_char  pad;


@@ -133,17 +129,15 @@ struct bsd_db {
 };
 
 #define BSD_OVHD       2               /* BSD compress overhead/packet */
 };
 
 #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,
 
 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,
 static int     bsd_decomp_init __P((void *state, u_char *options, int opt_len,

-                                    int unit, int mru, int debug));
+                                    int unit, int hdrlen, int mru, int debug));

 static int     bsd_compress __P((void *state, struct mbuf **mret,
                                  struct mbuf *mp, int slen, int maxolen));
 static void    bsd_incomp __P((void *state, struct mbuf *dmsg));
 static int     bsd_compress __P((void *state, struct mbuf **mret,
                                  struct mbuf *mp, int slen, int maxolen));
 static void    bsd_incomp __P((void *state, struct mbuf *dmsg));


@@ -156,7 +150,7 @@ static void bsd_comp_stats __P((void *state, struct compstat *stats));
  * Procedures exported to if_ppp.c.
  */
 struct compressor ppp_bsd_compress = {
  * 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 */
     bsd_comp_alloc,            /* comp_alloc */
     bsd_free,                  /* comp_free */
     bsd_comp_init,             /* comp_init */


@@ -190,7 +184,7 @@ struct compressor ppp_bsd_compress = {
 #define LAST   255
 
 #define MAXCODE(b)     ((1 << (b)) - 1)
 #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))
 
 #define BSD_HASH(prefix,suffix,hshift) ((((u_int32_t)(suffix)) << (hshift)) \
                                         ^ (u_int32_t)(prefix))


@@ -324,7 +318,8 @@ bsd_alloc(options, opt_len, decomp)
     u_int newlen, hsize, hshift, maxmaxcode;
     struct bsd_db *db;
 
     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]);
        || BSD_VERSION(options[2]) != BSD_CURRENT_VERSION)
        return NULL;
     bits = BSD_NBITS(options[2]);


@@ -414,14 +409,15 @@ bsd_decomp_alloc(options, opt_len)
  * Initialize the database.
  */
 static int
  * Initialize the database.
  */
 static int

-bsd_init(db, options, opt_len, unit, mru, debug, decomp)
+bsd_init(db, options, opt_len, unit, hdrlen, mru, debug, decomp)

     struct bsd_db *db;
     u_char *options;
     struct bsd_db *db;
     u_char *options;

-    int opt_len, unit, mru, debug, decomp;
+    int opt_len, unit, hdrlen, mru, debug, decomp;

 {
     int i;
 
 {
     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)
        || BSD_VERSION(options[2]) != BSD_CURRENT_VERSION
        || BSD_NBITS(options[2]) != db->maxbits
        || decomp && db->lens == NULL)


@@ -439,6 +435,7 @@ bsd_init(db, options, opt_len, unit, mru, debug, decomp)
     }
 
     db->unit = unit;
     }
 
     db->unit = unit;

+    db->hdrlen = hdrlen;

     db->mru = mru;
 #ifndef DEBUG
     if (debug)
     db->mru = mru;
 #ifndef DEBUG
     if (debug)


@@ -451,23 +448,23 @@ bsd_init(db, options, opt_len, unit, mru, debug, decomp)
 }
 
 static int
 }
 
 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;
     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,
 {
     return bsd_init((struct bsd_db *) state, options, opt_len,

-                   unit, 0, debug, 0);
+                   unit, hdrlen, 0, debug, 0);

 }
 
 static int
 }
 
 static int

-bsd_decomp_init(state, options, opt_len, unit, mru, debug)
+bsd_decomp_init(state, options, opt_len, unit, hdrlen, mru, debug)

     void *state;
     u_char *options;
     void *state;
     u_char *options;

-    int opt_len, unit, mru, debug;
+    int opt_len, unit, hdrlen, mru, debug;

 {
     return bsd_init((struct bsd_db *) state, options, opt_len,
 {
     return bsd_init((struct bsd_db *) state, options, opt_len,

-                   unit, mru, debug, 1);
+                   unit, hdrlen, mru, debug, 1);

 }
 
 
 }
 
 


@@ -551,9 +548,10 @@ bsd_compress(state, mret, mp, slen, maxolen)
     MGET(m, M_DONTWAIT, MT_DATA);
     *mret = m;
     if (m != NULL) {
     MGET(m, M_DONTWAIT, MT_DATA);
     *mret = m;
     if (m != NULL) {

-       if (maxolen > MLEN) {
+       if (maxolen + db->hdrlen > MLEN) {

            MCLGET(m, clp);
        }
            MCLGET(m, clp);
        }

+       m->m_off += db->hdrlen;

        m->m_len = 0;
        wptr = mtod(m, u_char *);
        cp_end = wptr + M_TRAILINGSPACE(m);
        m->m_len = 0;
        wptr = mtod(m, u_char *);
        cp_end = wptr + M_TRAILINGSPACE(m);


@@ -873,12 +871,13 @@ bsd_decompress(state, cmp, dmpp)
      * Check the sequence number and give up if it differs from
      * the value we're expecting.
      */
      * 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;
     }
        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.
 
     /*
      * Allocate one mbuf to start with.


@@ -890,6 +889,7 @@ bsd_decompress(state, cmp, dmpp)
     dmp->m_next = NULL;
     MCLGET(dmp, clp);
     dmp->m_len = 0;
     dmp->m_next = NULL;
     MCLGET(dmp, clp);
     dmp->m_len = 0;

+    dmp->m_off += db->hdrlen;

     wptr = mtod(dmp, u_char *);
     space = M_TRAILINGSPACE(dmp) - PPP_HDRLEN + 1;
 
     wptr = mtod(dmp, u_char *);
     space = M_TRAILINGSPACE(dmp) - PPP_HDRLEN + 1;
 


@@ -1124,3 +1124,4 @@ bsd_decompress(state, cmp, dmpp)
     return DECOMP_FATALERROR;
 #endif /* DEBUG */
 }
     return DECOMP_FATALERROR;
 #endif /* DEBUG */
 }

+#endif /* DO_BSD_COMPRESS */