198 lines
7.0 KiB
C
198 lines
7.0 KiB
C
/* infutil.h -- types and macros common to blocks and codes
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* Copyright (C) 1995-1998 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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/* 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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#include <linux/zconf.h>
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#include "inftrees.h"
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#include "infcodes.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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B_DONE, /* finished last block, done */
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B_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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uInt *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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Byte *window; /* sliding window */
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Byte *end; /* one byte after sliding window */
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Byte *read; /* window read pointer */
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Byte *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 zlib_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=zlib_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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extern uInt zlib_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 zlib_inflate_flush (
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inflate_blocks_statef *,
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z_streamp ,
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int);
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/* inflate private state */
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typedef enum {
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METHOD, /* waiting for method byte */
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FLAG, /* waiting for flag byte */
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DICT4, /* four dictionary check bytes to go */
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DICT3, /* three dictionary check bytes to go */
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DICT2, /* two dictionary check bytes to go */
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DICT1, /* one dictionary check byte to go */
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DICT0, /* waiting for inflateSetDictionary */
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BLOCKS, /* decompressing blocks */
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CHECK4, /* four check bytes to go */
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CHECK3, /* three check bytes to go */
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CHECK2, /* two check bytes to go */
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CHECK1, /* one check byte to go */
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I_DONE, /* finished check, done */
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I_BAD} /* got an error--stay here */
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inflate_mode;
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struct internal_state {
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/* mode */
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inflate_mode mode; /* current inflate mode */
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/* mode dependent information */
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union {
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uInt method; /* if FLAGS, method byte */
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struct {
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uLong was; /* computed check value */
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uLong need; /* stream check value */
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} check; /* if CHECK, check values to compare */
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uInt marker; /* if BAD, inflateSync's marker bytes count */
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} sub; /* submode */
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/* mode independent information */
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int nowrap; /* flag for no wrapper */
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uInt wbits; /* log2(window size) (8..15, defaults to 15) */
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inflate_blocks_statef
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*blocks; /* current inflate_blocks state */
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};
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/* inflate codes private state */
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typedef enum { /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
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START, /* x: set up for LEN */
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LEN, /* i: get length/literal/eob next */
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LENEXT, /* i: getting length extra (have base) */
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DIST, /* i: get distance next */
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DISTEXT, /* i: getting distance extra */
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COPY, /* o: copying bytes in window, waiting for space */
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LIT, /* o: got literal, waiting for output space */
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WASH, /* o: got eob, possibly still output waiting */
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END, /* x: got eob and all data flushed */
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BADCODE} /* x: got error */
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inflate_codes_mode;
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struct inflate_codes_state {
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/* mode */
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inflate_codes_mode mode; /* current inflate_codes mode */
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/* mode dependent information */
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uInt len;
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union {
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struct {
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inflate_huft *tree; /* pointer into tree */
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uInt need; /* bits needed */
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} code; /* if LEN or DIST, where in tree */
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uInt lit; /* if LIT, literal */
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struct {
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uInt get; /* bits to get for extra */
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uInt dist; /* distance back to copy from */
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} copy; /* if EXT or COPY, where and how much */
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} sub; /* submode */
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/* mode independent information */
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Byte lbits; /* ltree bits decoded per branch */
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Byte dbits; /* dtree bits decoder per branch */
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inflate_huft *ltree; /* literal/length/eob tree */
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inflate_huft *dtree; /* distance tree */
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};
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/* memory allocation for inflation */
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struct inflate_workspace {
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inflate_codes_statef working_state;
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struct inflate_blocks_state working_blocks_state;
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struct internal_state internal_state;
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unsigned int tree_work_area_1[19];
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unsigned int tree_work_area_2[288];
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unsigned working_blens[258 + 0x1f + 0x1f];
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inflate_huft working_hufts[MANY];
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unsigned char working_window[1 << MAX_WBITS];
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};
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#define WS(z) ((struct inflate_workspace *)(z->workspace))
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#endif
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