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d4286ec4 | 1 | /* infutil.h -- types and macros common to blocks and codes |
be59d0ec | 2 | * Copyright (C) 1995-2002 Mark Adler |
d4286ec4 PM |
3 | * For conditions of distribution and use, see copyright notice in zlib.h |
4 | */ | |
5 | ||
6 | /* WARNING: this file should *not* be used by applications. It is | |
7 | part of the implementation of the compression library and is | |
8 | subject to change. Applications should only use zlib.h. | |
9 | */ | |
10 | ||
11 | #ifndef _INFUTIL_H | |
12 | #define _INFUTIL_H | |
13 | ||
9819f005 WD |
14 | #ifdef BAD /* For AIX */ |
15 | #undef BAD | |
16 | #endif | |
17 | ||
d4286ec4 PM |
18 | typedef enum { |
19 | TYPE, /* get type bits (3, including end bit) */ | |
20 | LENS, /* get lengths for stored */ | |
21 | STORED, /* processing stored block */ | |
22 | TABLE, /* get table lengths */ | |
23 | BTREE, /* get bit lengths tree for a dynamic block */ | |
24 | DTREE, /* get length, distance trees for a dynamic block */ | |
25 | CODES, /* processing fixed or dynamic block */ | |
26 | DRY, /* output remaining window bytes */ | |
27 | DONE, /* finished last block, done */ | |
9819f005 | 28 | BAD} /* got a data error--stuck here */ |
d4286ec4 PM |
29 | inflate_block_mode; |
30 | ||
31 | /* inflate blocks semi-private state */ | |
32 | struct inflate_blocks_state { | |
33 | ||
34 | /* mode */ | |
35 | inflate_block_mode mode; /* current inflate_block mode */ | |
36 | ||
37 | /* mode dependent information */ | |
38 | union { | |
39 | uInt left; /* if STORED, bytes left to copy */ | |
40 | struct { | |
41 | uInt table; /* table lengths (14 bits) */ | |
42 | uInt index; /* index into blens (or border) */ | |
43 | uIntf *blens; /* bit lengths of codes */ | |
44 | uInt bb; /* bit length tree depth */ | |
45 | inflate_huft *tb; /* bit length decoding tree */ | |
46 | } trees; /* if DTREE, decoding info for trees */ | |
47 | struct { | |
48 | inflate_codes_statef | |
49 | *codes; | |
50 | } decode; /* if CODES, current state */ | |
51 | } sub; /* submode */ | |
52 | uInt last; /* true if this block is the last block */ | |
53 | ||
54 | /* mode independent information */ | |
55 | uInt bitk; /* bits in bit buffer */ | |
56 | uLong bitb; /* bit buffer */ | |
57 | inflate_huft *hufts; /* single malloc for tree space */ | |
58 | Bytef *window; /* sliding window */ | |
59 | Bytef *end; /* one byte after sliding window */ | |
60 | Bytef *read; /* window read pointer */ | |
61 | Bytef *write; /* window write pointer */ | |
62 | check_func checkfn; /* check function */ | |
63 | uLong check; /* check on output */ | |
64 | ||
65 | }; | |
66 | ||
67 | ||
68 | /* defines for inflate input/output */ | |
69 | /* update pointers and return */ | |
70 | #define UPDBITS {s->bitb=b;s->bitk=k;} | |
71 | #define UPDIN {z->avail_in=n;z->total_in+=p-z->next_in;z->next_in=p;} | |
72 | #define UPDOUT {s->write=q;} | |
73 | #define UPDATE {UPDBITS UPDIN UPDOUT} | |
74 | #define LEAVE {UPDATE return inflate_flush(s,z,r);} | |
75 | /* get bytes and bits */ | |
76 | #define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;} | |
77 | #define NEEDBYTE {if(n)r=Z_OK;else LEAVE} | |
78 | #define NEXTBYTE (n--,*p++) | |
79 | #define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}} | |
80 | #define DUMPBITS(j) {b>>=(j);k-=(j);} | |
81 | /* output bytes */ | |
82 | #define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q) | |
83 | #define LOADOUT {q=s->write;m=(uInt)WAVAIL;} | |
9add51f1 | 84 | #define ZWRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}} |
d4286ec4 | 85 | #define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT} |
9add51f1 | 86 | #define NEEDOUT {if(m==0){ZWRAP if(m==0){FLUSH ZWRAP if(m==0) LEAVE}}r=Z_OK;} |
d4286ec4 PM |
87 | #define OUTBYTE(a) {*q++=(Byte)(a);m--;} |
88 | /* load local pointers */ | |
89 | #define LOAD {LOADIN LOADOUT} | |
90 | ||
91 | /* masks for lower bits (size given to avoid silly warnings with Visual C++) */ | |
92 | extern uInt inflate_mask[17]; | |
93 | ||
94 | /* copy as much as possible from the sliding window to the output area */ | |
95 | extern int inflate_flush OF(( | |
96 | inflate_blocks_statef *, | |
97 | z_streamp , | |
98 | int)); | |
99 | ||
100 | struct internal_state {int dummy;}; /* for buggy compilers */ | |
101 | ||
102 | #endif |