ref: afaf3f1de925ade18d7fc2a202f28922cd5e91ff
dir: /src/gzip/infutil.h/
/* 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