/* Copyright 2012 The MathWorks, Inc. */

#ifndef _NET_PPP_COMP_H
#define _NET_PPP_COMP_H

#ifndef DO_BSD_COMPRESS
#define DO_BSD_COMPRESS 1
#endif
#ifndef DO_DEFLATE
#define DO_DEFLATE      1
#endif
#define DO_PREDICTOR_1  0
#define DO_PREDICTOR_2  0

struct compressor {
  int     compress_proto;
  void    *(*comp_alloc) (unsigned char *options, int opt_len);
  void    (*comp_free) (void *state);
  int     (*comp_init) (void *state, unsigned char *options, int opt_len, int unit, int opthdr, int debug);
  void    (*comp_reset) (void *state);
  int     (*compress) (void *state, unsigned char *rptr, unsigned char *obuf, int isize, int osize);
  void    (*comp_stat) (void *state, struct compstat *stats);
  void    *(*decomp_alloc) (unsigned char *options, int opt_len);
  void    (*decomp_free) (void *state);
  int     (*decomp_init) (void *state, unsigned char *options, int opt_len, int unit, int opthdr, int mru, int debug);
  void    (*decomp_reset) (void *state);
  int     (*decompress) (void *state, unsigned char *ibuf, int isize, unsigned char *obuf, int osize);
  void    (*incomp) (void *state, unsigned char *ibuf, int icnt);
  void    (*decomp_stat) (void *state, struct compstat *stats);
};

#define DECOMP_ERROR            -1
#define DECOMP_FATALERROR       -2

#define CCP_CONFREQ     1
#define CCP_CONFACK     2
#define CCP_TERMREQ     5
#define CCP_TERMACK     6
#define CCP_RESETREQ    14
#define CCP_RESETACK    15

#define CCP_MAX_OPTION_LENGTH   32

#define CCP_CODE(dp)            ((dp)[0])
#define CCP_ID(dp)              ((dp)[1])
#define CCP_LENGTH(dp)          (((dp)[2] << 8) + (dp)[3])
#define CCP_HDRLEN              4

#define CCP_OPT_CODE(dp)        ((dp)[0])
#define CCP_OPT_LENGTH(dp)      ((dp)[1])
#define CCP_OPT_MINLEN          2

#define CI_BSD_COMPRESS         21
#define CILEN_BSD_COMPRESS      3

#define BSD_NBITS(x)            ((x) & 0x1F)
#define BSD_VERSION(x)          ((x) >> 5)
#define BSD_CURRENT_VERSION     1
#define BSD_MAKE_OPT(v, n)      (((v) << 5) | (n))

#define BSD_MIN_BITS            9
#define BSD_MAX_BITS            15

#define CI_DEFLATE              26
#define CI_DEFLATE_DRAFT        24
#define CILEN_DEFLATE           4

#define DEFLATE_MIN_SIZE        8
#define DEFLATE_MAX_SIZE        15
#define DEFLATE_METHOD_VAL      8
#define DEFLATE_SIZE(x)         (((x) >> 4) + DEFLATE_MIN_SIZE)
#define DEFLATE_METHOD(x)       ((x) & 0x0F)
#define DEFLATE_MAKE_OPT(w)     ((((w) - DEFLATE_MIN_SIZE) << 4) \
                                 + DEFLATE_METHOD_VAL)
#define DEFLATE_CHK_SEQUENCE    0

#define CI_PREDICTOR_1          1
#define CILEN_PREDICTOR_1       2
#define CI_PREDICTOR_2          2
#define CILEN_PREDICTOR_2       2

#endif /* _NET_PPP_COMP_H */