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| Rev | Author | Line No. | Line |
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| 107 | pj | 1 | /* infutil.h -- types and macros common to blocks and codes |
| 2 | * Copyright (C) 1995-2002 Mark Adler |
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| 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
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| 4 | */ |
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| 5 | |||
| 6 | /* WARNING: this file should *not* be used by applications. It is |
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| 7 | part of the implementation of the compression library and is |
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| 8 | subject to change. Applications should only use zlib.h. |
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| 9 | */ |
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| 10 | |||
| 11 | #ifndef _INFUTIL_H |
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| 12 | #define _INFUTIL_H |
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| 13 | |||
| 14 | typedef enum { |
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| 15 | TYPE, /* get type bits (3, including end bit) */ |
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| 16 | LENS, /* get lengths for stored */ |
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| 17 | STORED, /* processing stored block */ |
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| 18 | TABLE, /* get table lengths */ |
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| 19 | BTREE, /* get bit lengths tree for a dynamic block */ |
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| 20 | DTREE, /* get length, distance trees for a dynamic block */ |
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| 21 | CODES, /* processing fixed or dynamic block */ |
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| 22 | DRY, /* output remaining window bytes */ |
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| 23 | DONE, /* finished last block, done */ |
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| 24 | BAD} /* got a data error--stuck here */ |
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| 25 | inflate_block_mode; |
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| 26 | |||
| 27 | /* inflate blocks semi-private state */ |
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| 28 | struct inflate_blocks_state { |
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| 29 | |||
| 30 | /* mode */ |
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| 31 | inflate_block_mode mode; /* current inflate_block mode */ |
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| 32 | |||
| 33 | /* mode dependent information */ |
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| 34 | union { |
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| 35 | uInt left; /* if STORED, bytes left to copy */ |
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| 36 | struct { |
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| 37 | uInt table; /* table lengths (14 bits) */ |
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| 38 | uInt index; /* index into blens (or border) */ |
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| 39 | uIntf *blens; /* bit lengths of codes */ |
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| 40 | uInt bb; /* bit length tree depth */ |
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| 41 | inflate_huft *tb; /* bit length decoding tree */ |
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| 42 | } trees; /* if DTREE, decoding info for trees */ |
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| 43 | struct { |
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| 44 | inflate_codes_statef |
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| 45 | *codes; |
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| 46 | } decode; /* if CODES, current state */ |
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| 47 | } sub; /* submode */ |
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| 48 | uInt last; /* true if this block is the last block */ |
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| 49 | |||
| 50 | /* mode independent information */ |
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| 51 | uInt bitk; /* bits in bit buffer */ |
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| 52 | uLong bitb; /* bit buffer */ |
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| 53 | inflate_huft *hufts; /* single malloc for tree space */ |
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| 54 | Bytef *window; /* sliding window */ |
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| 55 | Bytef *end; /* one byte after sliding window */ |
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| 56 | Bytef *read; /* window read pointer */ |
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| 57 | Bytef *write; /* window write pointer */ |
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| 58 | check_func checkfn; /* check function */ |
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| 59 | uLong check; /* check on output */ |
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| 60 | |||
| 61 | }; |
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| 62 | |||
| 63 | |||
| 64 | /* defines for inflate input/output */ |
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| 65 | /* update pointers and return */ |
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| 66 | #define UPDBITS {s->bitb=b;s->bitk=k;} |
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| 67 | #define UPDIN {z->avail_in=n;z->total_in+=p-z->next_in;z->next_in=p;} |
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| 68 | #define UPDOUT {s->write=q;} |
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| 69 | #define UPDATE {UPDBITS UPDIN UPDOUT} |
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| 70 | #define LEAVE {UPDATE return inflate_flush(s,z,r);} |
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| 71 | /* get bytes and bits */ |
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| 72 | #define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;} |
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| 73 | #define NEEDBYTE {if(n)r=Z_OK;else LEAVE} |
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| 74 | #define NEXTBYTE (n--,*p++) |
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| 75 | #define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}} |
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| 76 | #define DUMPBITS(j) {b>>=(j);k-=(j);} |
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| 77 | /* output bytes */ |
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| 78 | #define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q) |
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| 79 | #define LOADOUT {q=s->write;m=(uInt)WAVAIL;} |
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| 80 | #define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}} |
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| 81 | #define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT} |
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| 82 | #define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;} |
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| 83 | #define OUTBYTE(a) {*q++=(Byte)(a);m--;} |
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| 84 | /* load local pointers */ |
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| 85 | #define LOAD {LOADIN LOADOUT} |
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| 86 | |||
| 87 | /* masks for lower bits (size given to avoid silly warnings with Visual C++) */ |
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| 88 | extern uInt inflate_mask[17]; |
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| 89 | |||
| 90 | /* copy as much as possible from the sliding window to the output area */ |
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| 91 | extern int inflate_flush OF(( |
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| 92 | inflate_blocks_statef *, |
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| 93 | z_streamp , |
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| 94 | int)); |
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| 95 | |||
| 96 | struct internal_state {int dummy;}; /* for buggy compilers */ |
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| 97 | |||
| 98 | #endif |