/* inftrees.h -- header to use inftrees.c
   * Copyright (C) 1995-2005 Mark Adler
   * For conditions of distribution and use, see copyright notice in zlib.h
   */
  
  /* WARNING: this file should *not* be used by applications. It is
     part of the implementation of the compression library and is
     subject to change. Applications should only use zlib.h.
   */
  
  /* Structure for decoding tables.  Each entry provides either the
     information needed to do the operation requested by the code that
     indexed that table entry, or it provides a pointer to another
     table that indexes more bits of the code.  op indicates whether
     the entry is a pointer to another table, a literal, a length or
     distance, an end-of-block, or an invalid code.  For a table
     pointer, the low four bits of op is the number of index bits of
     that table.  For a length or distance, the low four bits of op
     is the number of extra bits to get after the code.  bits is
     the number of bits in this code or part of the code to drop off
     of the bit buffer.  val is the actual byte to output in the case
     of a literal, the base length or distance, or the offset from
     the current table to the next table.  Each entry is four bytes. */
  typedef struct {
      unsigned char op;           /* operation, extra bits, table bits */
      unsigned char bits;         /* bits in this part of the code */
      unsigned short val;         /* offset in table or code value */
  } code;
  
  /* op values as set by inflate_table():
      00000000 - literal
      0000tttt - table link, tttt != 0 is the number of table index bits
      0001eeee - length or distance, eeee is the number of extra bits
      01100000 - end of block
      01000000 - invalid code
   */
  
  /* Maximum size of dynamic tree.  The maximum found in a long but non-
     exhaustive search was 1444 code structures (852 for length/literals
     and 592 for distances, the latter actually the result of an
     exhaustive search).  The true maximum is not known, but the value
     below is more than safe. */
  #define ENOUGH 2048
  #define MAXD 592
  
  /* Type of code to build for inftable() */
  typedef enum {
      CODES,
      LENS,
      DISTS
  } codetype;
  
  extern int inflate_table OF((codetype type, unsigned short FAR *lens,
                               unsigned codes, code FAR * FAR *table,
                               unsigned FAR *bits, unsigned short FAR *work));