| /* 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++) */ |
| #ifndef NO_INFLATE_MASK |
| local uInt inflate_mask[17]; |
| #endif |
| |
| /* copy as much as possible from the sliding window to the output area */ |
| local int inflate_flush OF(( |
| inflate_blocks_statef *, |
| z_streamp , |
| int)); |
| |
| #endif |