5128eecc9f 2011-02-23 kinaba: /* infutil.h -- types and macros common to blocks and codes 5128eecc9f 2011-02-23 kinaba: * Copyright (C) 1995-1998 Mark Adler 5128eecc9f 2011-02-23 kinaba: * For conditions of distribution and use, see copyright notice in zlib.h 5128eecc9f 2011-02-23 kinaba: */ 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: /* WARNING: this file should *not* be used by applications. It is 5128eecc9f 2011-02-23 kinaba: part of the implementation of the compression library and is 5128eecc9f 2011-02-23 kinaba: subject to change. Applications should only use zlib.h. 5128eecc9f 2011-02-23 kinaba: */ 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: #ifndef _INFUTIL_H 5128eecc9f 2011-02-23 kinaba: #define _INFUTIL_H 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: typedef enum { 5128eecc9f 2011-02-23 kinaba: TYPE, /* get type bits (3, including end bit) */ 5128eecc9f 2011-02-23 kinaba: LENS, /* get lengths for stored */ 5128eecc9f 2011-02-23 kinaba: STORED, /* processing stored block */ 5128eecc9f 2011-02-23 kinaba: TABLE, /* get table lengths */ 5128eecc9f 2011-02-23 kinaba: BTREE, /* get bit lengths tree for a dynamic block */ 5128eecc9f 2011-02-23 kinaba: DTREE, /* get length, distance trees for a dynamic block */ 5128eecc9f 2011-02-23 kinaba: CODES, /* processing fixed or dynamic block */ 5128eecc9f 2011-02-23 kinaba: DRY, /* output remaining window bytes */ 5128eecc9f 2011-02-23 kinaba: DONE, /* finished last block, done */ 5128eecc9f 2011-02-23 kinaba: BAD} /* got a data error--stuck here */ 5128eecc9f 2011-02-23 kinaba: inflate_block_mode; 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: /* inflate blocks semi-private state */ 5128eecc9f 2011-02-23 kinaba: struct inflate_blocks_state { 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: /* mode */ 5128eecc9f 2011-02-23 kinaba: inflate_block_mode mode; /* current inflate_block mode */ 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: /* mode dependent information */ 5128eecc9f 2011-02-23 kinaba: union { 5128eecc9f 2011-02-23 kinaba: uInt left; /* if STORED, bytes left to copy */ 5128eecc9f 2011-02-23 kinaba: struct { 5128eecc9f 2011-02-23 kinaba: uInt table; /* table lengths (14 bits) */ 5128eecc9f 2011-02-23 kinaba: uInt index; /* index into blens (or border) */ 5128eecc9f 2011-02-23 kinaba: uIntf *blens; /* bit lengths of codes */ 5128eecc9f 2011-02-23 kinaba: uInt bb; /* bit length tree depth */ 5128eecc9f 2011-02-23 kinaba: inflate_huft *tb; /* bit length decoding tree */ 5128eecc9f 2011-02-23 kinaba: } trees; /* if DTREE, decoding info for trees */ 5128eecc9f 2011-02-23 kinaba: struct { 5128eecc9f 2011-02-23 kinaba: inflate_codes_statef 5128eecc9f 2011-02-23 kinaba: *codes; 5128eecc9f 2011-02-23 kinaba: } decode; /* if CODES, current state */ 5128eecc9f 2011-02-23 kinaba: } sub; /* submode */ 5128eecc9f 2011-02-23 kinaba: uInt last; /* true if this block is the last block */ 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: /* mode independent information */ 5128eecc9f 2011-02-23 kinaba: uInt bitk; /* bits in bit buffer */ 5128eecc9f 2011-02-23 kinaba: uLong bitb; /* bit buffer */ 5128eecc9f 2011-02-23 kinaba: inflate_huft *hufts; /* single malloc for tree space */ 5128eecc9f 2011-02-23 kinaba: Bytef *window; /* sliding window */ 5128eecc9f 2011-02-23 kinaba: Bytef *end; /* one byte after sliding window */ 5128eecc9f 2011-02-23 kinaba: Bytef *read; /* window read pointer */ 5128eecc9f 2011-02-23 kinaba: Bytef *write; /* window write pointer */ 5128eecc9f 2011-02-23 kinaba: check_func checkfn; /* check function */ 5128eecc9f 2011-02-23 kinaba: uLong check; /* check on output */ 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: }; 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: /* defines for inflate input/output */ 5128eecc9f 2011-02-23 kinaba: /* update pointers and return */ 5128eecc9f 2011-02-23 kinaba: #define UPDBITS {s->bitb=b;s->bitk=k;} 5128eecc9f 2011-02-23 kinaba: #define UPDIN {z->avail_in=n;z->total_in+=p-z->next_in;z->next_in=p;} 5128eecc9f 2011-02-23 kinaba: #define UPDOUT {s->write=q;} 5128eecc9f 2011-02-23 kinaba: #define UPDATE {UPDBITS UPDIN UPDOUT} 5128eecc9f 2011-02-23 kinaba: #define LEAVE {UPDATE return inflate_flush(s,z,r);} 5128eecc9f 2011-02-23 kinaba: /* get bytes and bits */ 5128eecc9f 2011-02-23 kinaba: #define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;} 5128eecc9f 2011-02-23 kinaba: #define NEEDBYTE {if(n)r=Z_OK;else LEAVE} 5128eecc9f 2011-02-23 kinaba: #define NEXTBYTE (n--,*p++) 5128eecc9f 2011-02-23 kinaba: #define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}} 5128eecc9f 2011-02-23 kinaba: #define DUMPBITS(j) {b>>=(j);k-=(j);} 5128eecc9f 2011-02-23 kinaba: /* output bytes */ 5128eecc9f 2011-02-23 kinaba: #define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q) 5128eecc9f 2011-02-23 kinaba: #define LOADOUT {q=s->write;m=(uInt)WAVAIL;} 5128eecc9f 2011-02-23 kinaba: #define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}} 5128eecc9f 2011-02-23 kinaba: #define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT} 5128eecc9f 2011-02-23 kinaba: #define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;} 5128eecc9f 2011-02-23 kinaba: #define OUTBYTE(a) {*q++=(Byte)(a);m--;} 5128eecc9f 2011-02-23 kinaba: /* load local pointers */ 5128eecc9f 2011-02-23 kinaba: #define LOAD {LOADIN LOADOUT} 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: /* masks for lower bits (size given to avoid silly warnings with Visual C++) */ 5128eecc9f 2011-02-23 kinaba: extern uInt inflate_mask[17]; 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: /* copy as much as possible from the sliding window to the output area */ 5128eecc9f 2011-02-23 kinaba: extern int inflate_flush OF(( 5128eecc9f 2011-02-23 kinaba: inflate_blocks_statef *, 5128eecc9f 2011-02-23 kinaba: z_streamp , 5128eecc9f 2011-02-23 kinaba: int)); 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: struct internal_state {int dummy;}; /* for buggy compilers */ 5128eecc9f 2011-02-23 kinaba: 5128eecc9f 2011-02-23 kinaba: #endif