J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 3 | * |
| 4 | * This code is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License version 2 only, as |
| 6 | * published by the Free Software Foundation. Sun designates this |
| 7 | * particular file as subject to the "Classpath" exception as provided |
| 8 | * by Sun in the LICENSE file that accompanied this code. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 21 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 22 | * have any questions. |
| 23 | */ |
| 24 | |
| 25 | /* |
| 26 | * This file is available under and governed by the GNU General Public |
| 27 | * License version 2 only, as published by the Free Software Foundation. |
| 28 | * However, the following notice accompanied the original version of this |
| 29 | * file and, per its terms, should not be removed: |
| 30 | * |
| 31 | * infutil.h -- types and macros common to blocks and codes |
| 32 | * Copyright (C) 1995-1998 Mark Adler |
| 33 | * For conditions of distribution and use, see copyright notice in zlib.h |
| 34 | */ |
| 35 | |
| 36 | /* WARNING: this file should *not* be used by applications. It is |
| 37 | part of the implementation of the compression library and is |
| 38 | subject to change. Applications should only use zlib.h. |
| 39 | */ |
| 40 | |
| 41 | #ifndef _INFUTIL_H |
| 42 | #define _INFUTIL_H |
| 43 | |
| 44 | typedef enum { |
| 45 | TYPE, /* get type bits (3, including end bit) */ |
| 46 | LENS, /* get lengths for stored */ |
| 47 | STORED, /* processing stored block */ |
| 48 | TABLE, /* get table lengths */ |
| 49 | BTREE, /* get bit lengths tree for a dynamic block */ |
| 50 | DTREE, /* get length, distance trees for a dynamic block */ |
| 51 | CODES, /* processing fixed or dynamic block */ |
| 52 | DRY, /* output remaining window bytes */ |
| 53 | DONE, /* finished last block, done */ |
| 54 | BAD} /* got a data error--stuck here */ |
| 55 | inflate_block_mode; |
| 56 | |
| 57 | /* inflate blocks semi-private state */ |
| 58 | struct inflate_blocks_state { |
| 59 | |
| 60 | /* mode */ |
| 61 | inflate_block_mode mode; /* current inflate_block mode */ |
| 62 | |
| 63 | /* mode dependent information */ |
| 64 | union { |
| 65 | uInt left; /* if STORED, bytes left to copy */ |
| 66 | struct { |
| 67 | uInt table; /* table lengths (14 bits) */ |
| 68 | uInt index; /* index into blens (or border) */ |
| 69 | uIntf *blens; /* bit lengths of codes */ |
| 70 | uInt bb; /* bit length tree depth */ |
| 71 | inflate_huft *tb; /* bit length decoding tree */ |
| 72 | } trees; /* if DTREE, decoding info for trees */ |
| 73 | struct { |
| 74 | inflate_codes_statef |
| 75 | *codes; |
| 76 | } decode; /* if CODES, current state */ |
| 77 | } sub; /* submode */ |
| 78 | uInt last; /* true if this block is the last block */ |
| 79 | |
| 80 | /* mode independent information */ |
| 81 | uInt bitk; /* bits in bit buffer */ |
| 82 | uLong bitb; /* bit buffer */ |
| 83 | inflate_huft *hufts; /* single malloc for tree space */ |
| 84 | Bytef *window; /* sliding window */ |
| 85 | Bytef *end; /* one byte after sliding window */ |
| 86 | Bytef *read; /* window read pointer */ |
| 87 | Bytef *write; /* window write pointer */ |
| 88 | check_func checkfn; /* check function */ |
| 89 | uLong check; /* check on output */ |
| 90 | |
| 91 | }; |
| 92 | |
| 93 | |
| 94 | /* defines for inflate input/output */ |
| 95 | /* update pointers and return */ |
| 96 | #define UPDBITS {s->bitb=b;s->bitk=k;} |
| 97 | #define UPDIN {z->avail_in=n;z->total_in+=p-z->next_in;z->next_in=p;} |
| 98 | #define UPDOUT {s->write=q;} |
| 99 | #define UPDATE {UPDBITS UPDIN UPDOUT} |
| 100 | #define LEAVE {UPDATE return inflate_flush(s,z,r);} |
| 101 | /* get bytes and bits */ |
| 102 | #define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;} |
| 103 | #define NEEDBYTE {if(n)r=Z_OK;else LEAVE} |
| 104 | #define NEXTBYTE (n--,*p++) |
| 105 | #define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}} |
| 106 | #define DUMPBITS(j) {b>>=(j);k-=(j);} |
| 107 | /* output bytes */ |
| 108 | #define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q) |
| 109 | #define LOADOUT {q=s->write;m=(uInt)WAVAIL;} |
| 110 | #define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}} |
| 111 | #define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT} |
| 112 | #define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;} |
| 113 | #define OUTBYTE(a) {*q++=(Byte)(a);m--;} |
| 114 | /* load local pointers */ |
| 115 | #define LOAD {LOADIN LOADOUT} |
| 116 | |
| 117 | /* masks for lower bits (size given to avoid silly warnings with Visual C++) */ |
| 118 | extern uInt inflate_mask[17]; |
| 119 | |
| 120 | /* copy as much as possible from the sliding window to the output area */ |
| 121 | extern int inflate_flush OF(( |
| 122 | inflate_blocks_statef *, |
| 123 | z_streamp , |
| 124 | int)); |
| 125 | |
| 126 | struct internal_state {int dummy;}; /* for buggy compilers */ |
| 127 | |
| 128 | #endif |