105 lines
3.7 KiB
C
105 lines
3.7 KiB
C
/*
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* Copyright (C) 1995-2002 Mark Adler
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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/**
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* \file infutil.h
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* Types and macros common to blocks and codes.
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*/
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/* WARNING: this file should *not* be used by applications. It is
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part of the implementation of the compression library and is
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subject to change. Applications should only use zlib.h.
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*/
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#ifndef _INFUTIL_H
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#define _INFUTIL_H
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typedef enum {
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TYPE, /*!< get type bits (3, including end bit) */
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LENS, /*!< get lengths for stored */
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STORED, /*!< processing stored block */
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TABLE, /*!< get table lengths */
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BTREE, /*!< get bit lengths tree for a dynamic block */
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DTREE, /*!< get length, distance trees for a dynamic block */
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CODES, /*!< processing fixed or dynamic block */
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DRY, /*!< output remaining window bytes */
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DONE, /*!< finished last block, done */
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BAD} /*!< got a data error--stuck here */
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inflate_block_mode;
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/* inflate blocks semi-private state */
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struct inflate_blocks_state {
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/* mode */
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inflate_block_mode mode; /*!< current inflate_block mode */
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/* mode dependent information */
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union {
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uInt left; /*!< if STORED, bytes left to copy */
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struct {
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uInt table; /*!< table lengths (14 bits) */
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uInt index; /*!< index into blens (or border) */
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uIntf *blens; /*!< bit lengths of codes */
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uInt bb; /*!< bit length tree depth */
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inflate_huft *tb; /*!< bit length decoding tree */
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} trees; /*!< if DTREE, decoding info for trees */
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struct {
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inflate_codes_statef
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*codes;
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} decode; /*!< if CODES, current state */
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} sub; /*!< submode */
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uInt last; /*!< true if this block is the last block */
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/* mode independent information */
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uInt bitk; /*!< bits in bit buffer */
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uLong bitb; /*!< bit buffer */
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inflate_huft *hufts; /*!< single malloc for tree space */
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Bytef *window; /*!< sliding window */
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Bytef *end; /*!< one byte after sliding window */
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Bytef *read; /*!< window read pointer */
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Bytef *write; /*!< window write pointer */
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check_func checkfn; /*!< check function */
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uLong check; /*!< check on output */
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};
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/* defines for inflate input/output */
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/* update pointers and return */
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#define UPDBITS {s->bitb=b;s->bitk=k;}
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#define UPDIN {z->avail_in=n;z->total_in+=p-z->next_in;z->next_in=p;}
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#define UPDOUT {s->write=q;}
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#define UPDATE {UPDBITS UPDIN UPDOUT}
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#define LEAVE {UPDATE return inflate_flush(s,z,r);}
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/* get bytes and bits */
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#define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;}
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#define NEEDBYTE {if(n)r=Z_OK;else LEAVE}
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#define NEXTBYTE (n--,*p++)
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#define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}}
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#define DUMPBITS(j) {b>>=(j);k-=(j);}
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/* output bytes */
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#define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q)
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#define LOADOUT {q=s->write;m=(uInt)WAVAIL;}
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#define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}}
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#define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT}
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#define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;}
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#define OUTBYTE(a) {*q++=(Byte)(a);m--;}
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/* load local pointers */
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#define LOAD {LOADIN LOADOUT}
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/** masks for lower bits (size given to avoid silly warnings with Visual C++) */
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/*@unchecked@*/
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extern uInt inflate_mask[17];
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/** copy as much as possible from the sliding window to the output area */
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extern int inflate_flush OF((
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inflate_blocks_statef * s,
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z_streamp z,
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int r));
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struct internal_state {int dummy;}; /* for buggy compilers */
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#endif
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