FreeBSD/Linux Kernel Cross Reference
sys/libkern/zlib/inftrees.h

     /*
      * Copyright (c) 2008 Apple Inc. All rights reserved.
      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
      * Version 2.0 (the 'License'). You may not use this file except in
      * compliance with the License. The rights granted to you under the License
     * may not be used to create, or enable the creation or redistribution of,
     * unlawful or unlicensed copies of an Apple operating system, or to
     * circumvent, violate, or enable the circumvention or violation of, any
     * terms of an Apple operating system software license agreement.
     * 
     * Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
     */
    /* 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));

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