99 lines
3.6 KiB
C
99 lines
3.6 KiB
C
/* infutil.h -- types and macros common to blocks and codes
|
|
* Copyright (C) 1995-2002 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.
|
|
*/
|
|
|
|
#ifndef _INFUTIL_H
|
|
#define _INFUTIL_H
|
|
|
|
typedef enum {
|
|
TYPE, /* get type bits (3, including end bit) */
|
|
LENS, /* get lengths for stored */
|
|
STORED, /* processing stored block */
|
|
TABLE, /* get table lengths */
|
|
BTREE, /* get bit lengths tree for a dynamic block */
|
|
DTREE, /* get length, distance trees for a dynamic block */
|
|
CODES, /* processing fixed or dynamic block */
|
|
DRY, /* output remaining window bytes */
|
|
DONE, /* finished last block, done */
|
|
BAD} /* got a data error--stuck here */
|
|
inflate_block_mode;
|
|
|
|
/* inflate blocks semi-private state */
|
|
struct inflate_blocks_state {
|
|
|
|
/* mode */
|
|
inflate_block_mode mode; /* current inflate_block mode */
|
|
|
|
/* mode dependent information */
|
|
union {
|
|
uInt left; /* if STORED, bytes left to copy */
|
|
struct {
|
|
uInt table; /* table lengths (14 bits) */
|
|
uInt index; /* index into blens (or border) */
|
|
uIntf *blens; /* bit lengths of codes */
|
|
uInt bb; /* bit length tree depth */
|
|
inflate_huft *tb; /* bit length decoding tree */
|
|
} trees; /* if DTREE, decoding info for trees */
|
|
struct {
|
|
inflate_codes_statef
|
|
*codes;
|
|
} decode; /* if CODES, current state */
|
|
} sub; /* submode */
|
|
uInt last; /* true if this block is the last block */
|
|
|
|
/* mode independent information */
|
|
uInt bitk; /* bits in bit buffer */
|
|
uLong bitb; /* bit buffer */
|
|
inflate_huft *hufts; /* single malloc for tree space */
|
|
Bytef *window; /* sliding window */
|
|
Bytef *end; /* one byte after sliding window */
|
|
Bytef *read; /* window read pointer */
|
|
Bytef *write; /* window write pointer */
|
|
check_func checkfn; /* check function */
|
|
uLong check; /* check on output */
|
|
|
|
};
|
|
|
|
|
|
/* defines for inflate input/output */
|
|
/* update pointers and return */
|
|
#define UPDBITS {s->bitb=b;s->bitk=k;}
|
|
#define UPDIN {z->avail_in=n;z->total_in+=p-z->next_in;z->next_in=p;}
|
|
#define UPDOUT {s->write=q;}
|
|
#define UPDATE {UPDBITS UPDIN UPDOUT}
|
|
#define LEAVE {UPDATE return inflate_flush(s,z,r);}
|
|
/* get bytes and bits */
|
|
#define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;}
|
|
#define NEEDBYTE {if(n)r=Z_OK;else LEAVE}
|
|
#define NEXTBYTE (n--,*p++)
|
|
#define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}}
|
|
#define DUMPBITS(j) {b>>=(j);k-=(j);}
|
|
/* output bytes */
|
|
#define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q)
|
|
#define LOADOUT {q=s->write;m=(uInt)WAVAIL;}
|
|
#define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}}
|
|
#define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT}
|
|
#define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;}
|
|
#define OUTBYTE(a) {*q++=(Byte)(a);m--;}
|
|
/* load local pointers */
|
|
#define LOAD {LOADIN LOADOUT}
|
|
|
|
/* masks for lower bits (size given to avoid silly warnings with Visual C++) */
|
|
extern uInt inflate_mask[17];
|
|
|
|
/* copy as much as possible from the sliding window to the output area */
|
|
extern int inflate_flush OF((
|
|
inflate_blocks_statef *,
|
|
z_streamp ,
|
|
int));
|
|
|
|
struct internal_state {int dummy;}; /* for buggy compilers */
|
|
|
|
#endif
|