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<hr><h1>infutil.h</h1><div class="fragment"><pre>00001 <font class="comment">/* infutil.h -- types and macros common to blocks and codes</font>
00002 <font class="comment"> * Copyright (C) 1995-1998 Mark Adler</font>
00003 <font class="comment"> * For conditions of distribution and use, see copyright notice in zlib.h </font>
00004 <font class="comment"> */</font>
00005
00006 <font class="comment">/* WARNING: this file should *not* be used by applications. It is</font>
00007 <font class="comment"> part of the implementation of the compression library and is</font>
00008 <font class="comment"> subject to change. Applications should only use zlib.h.</font>
00009 <font class="comment"> */</font>
00010
00011 <font class="preprocessor">#ifndef _INFUTIL_H</font>
00012 <font class="preprocessor"></font><font class="preprocessor">#define _INFUTIL_H</font>
00013 <font class="preprocessor"></font>
00014 <font class="keyword">typedef</font> <font class="keyword">enum</font> {
00015 TYPE, <font class="comment">/* get type bits (3, including end bit) */</font>
00016 LENS, <font class="comment">/* get lengths for stored */</font>
00017 STORED, <font class="comment">/* processing stored block */</font>
00018 TABLE, <font class="comment">/* get table lengths */</font>
00019 BTREE, <font class="comment">/* get bit lengths tree for a dynamic block */</font>
00020 DTREE, <font class="comment">/* get length, distance trees for a dynamic block */</font>
00021 CODES, <font class="comment">/* processing fixed or dynamic block */</font>
00022 DRY, <font class="comment">/* output remaining window bytes */</font>
00023 DONE, <font class="comment">/* finished last block, done */</font>
00024 BAD} <font class="comment">/* got a data error--stuck here */</font>
00025 inflate_block_mode;
00026
00027 <font class="comment">/* inflate blocks semi-private state */</font>
00028 <font class="keyword">struct </font>inflate_blocks_state {
00029
00030 <font class="comment">/* mode */</font>
00031 inflate_block_mode mode; <font class="comment">/* current inflate_block mode */</font>
00032
00033 <font class="comment">/* mode dependent information */</font>
00034 <font class="keyword">union </font>{
00035 uInt left; <font class="comment">/* if STORED, bytes left to copy */</font>
00036 <font class="keyword">struct </font>{
00037 uInt table; <font class="comment">/* table lengths (14 bits) */</font>
00038 uInt index; <font class="comment">/* index into blens (or border) */</font>
00039 uIntf *blens; <font class="comment">/* bit lengths of codes */</font>
00040 uInt bb; <font class="comment">/* bit length tree depth */</font>
00041 inflate_huft *tb; <font class="comment">/* bit length decoding tree */</font>
00042 } trees; <font class="comment">/* if DTREE, decoding info for trees */</font>
00043 <font class="keyword">struct </font>{
00044 inflate_codes_statef
00045 *codes;
00046 } decode; <font class="comment">/* if CODES, current state */</font>
00047 } sub; <font class="comment">/* submode */</font>
00048 uInt last; <font class="comment">/* true if this block is the last block */</font>
00049
00050 <font class="comment">/* mode independent information */</font>
00051 uInt bitk; <font class="comment">/* bits in bit buffer */</font>
00052 uLong bitb; <font class="comment">/* bit buffer */</font>
00053 inflate_huft *hufts; <font class="comment">/* single malloc for tree space */</font>
00054 Bytef *window; <font class="comment">/* sliding window */</font>
00055 Bytef *end; <font class="comment">/* one byte after sliding window */</font>
00056 Bytef *read; <font class="comment">/* window read pointer */</font>
00057 Bytef *write; <font class="comment">/* window write pointer */</font>
00058 check_func checkfn; <font class="comment">/* check function */</font>
00059 uLong check; <font class="comment">/* check on output */</font>
00060
00061 };
00062
00063
00064 <font class="comment">/* defines for inflate input/output */</font>
00065 <font class="comment">/* update pointers and return */</font>
00066 <font class="preprocessor">#define UPDBITS {s->bitb=b;s->bitk=k;}</font>
00067 <font class="preprocessor"></font><font class="preprocessor">#define UPDIN {z->avail_in=n;z->total_in+=p-z->next_in;z->next_in=p;}</font>
00068 <font class="preprocessor"></font><font class="preprocessor">#define UPDOUT {s->write=q;}</font>
00069 <font class="preprocessor"></font><font class="preprocessor">#define UPDATE {UPDBITS UPDIN UPDOUT}</font>
00070 <font class="preprocessor"></font><font class="preprocessor">#define LEAVE {UPDATE return inflate_flush(s,z,r);}</font>
00071 <font class="preprocessor"></font><font class="comment">/* get bytes and bits */</font>
00072 <font class="preprocessor">#define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;}</font>
00073 <font class="preprocessor"></font><font class="preprocessor">#define NEEDBYTE {if(n)r=Z_OK;else LEAVE}</font>
00074 <font class="preprocessor"></font><font class="preprocessor">#define NEXTBYTE (n--,*p++)</font>
00075 <font class="preprocessor"></font><font class="preprocessor">#define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}}</font>
00076 <font class="preprocessor"></font><font class="preprocessor">#define DUMPBITS(j) {b>>=(j);k-=(j);}</font>
00077 <font class="preprocessor"></font><font class="comment">/* output bytes */</font>
00078 <font class="preprocessor">#define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q)</font>
00079 <font class="preprocessor"></font><font class="preprocessor">#define LOADOUT {q=s->write;m=(uInt)WAVAIL;}</font>
00080 <font class="preprocessor"></font><font class="preprocessor">#define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}}</font>
00081 <font class="preprocessor"></font><font class="preprocessor">#define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT}</font>
00082 <font class="preprocessor"></font><font class="preprocessor">#define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;}</font>
00083 <font class="preprocessor"></font><font class="preprocessor">#define OUTBYTE(a) {*q++=(Byte)(a);m--;}</font>
00084 <font class="preprocessor"></font><font class="comment">/* load local pointers */</font>
00085 <font class="preprocessor">#define LOAD {LOADIN LOADOUT}</font>
00086 <font class="preprocessor"></font>
00087 <font class="comment">/* masks for lower bits (size given to avoid silly warnings with Visual C++) */</font>
00088 <font class="keyword">extern</font> uInt inflate_mask[17];
00089
00090 <font class="comment">/* copy as much as possible from the sliding window to the output area */</font>
00091 <font class="keyword">extern</font> <font class="keywordtype">int</font> inflate_flush OF((
00092 inflate_blocks_statef *,
00093 z_streamp ,
00094 <font class="keywordtype">int</font>));
00095
00096 <font class="keyword">struct </font>internal_state {<font class="keywordtype">int</font> dummy;}; <font class="comment">/* for buggy compilers */</font>
00097
00098 <font class="preprocessor">#endif</font>
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