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Member "zsync-0.6.2/zlib/inflate.h" (16 Sep 2010, 5861 Bytes) of package /linux/privat/old/zsync-0.6.2.tar.gz:


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    1 /* inflate.h -- internal inflate state definition
    2  * Copyright (C) 1995-2003 Mark Adler
    3  * For conditions of distribution and use, see copyright notice in zlib.h
    4  */
    5 
    6 /* WARNING: this file should *not* be used by applications. It is
    7    part of the implementation of the compression library and is
    8    subject to change. Applications should only use zlib.h.
    9  */
   10 
   11 /* define NO_GZIP when compiling if you want to disable gzip header and
   12    trailer decoding by inflate().  NO_GZIP would be used to avoid linking in
   13    the crc code when it is not needed.  For shared libraries, gzip decoding
   14    should be left enabled. */
   15 #ifndef NO_GZIP
   16 #  define GUNZIP
   17 #endif
   18 
   19 /* Possible inflate modes between inflate() calls */
   20 typedef enum {
   21     HEAD,       /* i: waiting for magic header */
   22 #ifdef GUNZIP
   23     FLAGS,      /* i: waiting for method and flags (gzip) */
   24     TIME,       /* i: waiting for modification time (gzip) */
   25     OS,         /* i: waiting for extra flags and operating system (gzip) */
   26     EXLEN,      /* i: waiting for extra length (gzip) */
   27     EXTRA,      /* i: waiting for extra bytes (gzip) */
   28     NAME,       /* i: waiting for end of file name (gzip) */
   29     COMMENT,    /* i: waiting for end of comment (gzip) */
   30     HCRC,       /* i: waiting for header crc (gzip) */
   31 #endif
   32     DICTID,     /* i: waiting for dictionary check value */
   33     DICT,       /* waiting for inflateSetDictionary() call */
   34         TYPE,       /* i: waiting for type bits, including last-flag bit */
   35         TYPEDO,     /* i: same, but skip check to exit inflate on new block */
   36         STORED,     /* i: waiting for stored size (length and complement) */
   37         COPY,       /* i/o: waiting for input or output to copy stored block */
   38         TABLE,      /* i: waiting for dynamic block table lengths */
   39         LENLENS,    /* i: waiting for code length code lengths */
   40         CODELENS,   /* i: waiting for length/lit and distance code lengths */
   41             LEN,        /* i: waiting for length/lit code */
   42             LENDO,      /* i: same, but skip exit check */
   43             LENEXT,     /* i: waiting for length extra bits */
   44             DIST,       /* i: waiting for distance code */
   45             DISTEXT,    /* i: waiting for distance extra bits */
   46             MATCH,      /* o: waiting for output space to copy string */
   47             LIT,        /* o: waiting for output space to write literal */
   48     CHECK,      /* i: waiting for 32-bit check value */
   49 #ifdef GUNZIP
   50     LENGTH,     /* i: waiting for 32-bit length (gzip) */
   51 #endif
   52     DONE,       /* finished check, done -- remain here until reset */
   53     BAD,        /* got a data error -- remain here until reset */
   54     MEM,        /* got an inflate() memory error -- remain here until reset */
   55     SYNC        /* looking for synchronization bytes to restart inflate() */
   56 } inflate_mode;
   57 
   58 /*
   59     State transitions between above modes -
   60 
   61     (most modes can go to the BAD or MEM mode -- not shown for clarity)
   62 
   63     Process header:
   64         HEAD -> (gzip) or (zlib)
   65         (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME
   66         NAME -> COMMENT -> HCRC -> TYPE
   67         (zlib) -> DICTID or TYPE
   68         DICTID -> DICT -> TYPE
   69     Read deflate blocks:
   70             TYPE -> STORED or TABLE or LEN or CHECK
   71             STORED -> COPY -> TYPE
   72             TABLE -> LENLENS -> CODELENS -> LEN
   73     Read deflate codes:
   74                 LEN -> LENEXT or LIT or TYPE
   75                 LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
   76                 LIT -> LEN
   77     Process trailer:
   78         CHECK -> LENGTH -> DONE
   79  */
   80 
   81 /* state maintained between inflate() calls.  Approximately 7K bytes. */
   82 struct inflate_state {
   83     inflate_mode mode;          /* current inflate mode */
   84     int last;                   /* true if processing last block */
   85     int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip */
   86     int havedict;               /* true if dictionary provided */
   87     int flags;                  /* gzip header method and flags (0 if zlib) */
   88     unsigned long check;        /* protected copy of check value */
   89     unsigned long total;        /* protected copy of output count */
   90         /* sliding window */
   91     unsigned wbits;             /* log base 2 of requested window size */
   92     unsigned wsize;             /* window size or zero if not using window */
   93     unsigned whave;             /* valid bytes in the window */
   94     unsigned write;             /* window write index */
   95     unsigned char FAR *window;  /* allocated sliding window, if needed */
   96         /* bit accumulator */
   97     unsigned long hold;         /* input bit accumulator */
   98     unsigned bits;              /* number of bits in "in" */
   99         /* for string and stored block copying */
  100     unsigned length;            /* literal or length of data to copy */
  101     unsigned offset;            /* distance back to copy string from */
  102         /* for table and code decoding */
  103     unsigned extra;             /* extra bits needed */
  104         /* fixed and dynamic code tables */
  105     code const FAR *lencode;    /* starting table for length/literal codes */
  106     code const FAR *distcode;   /* starting table for distance codes */
  107     unsigned lenbits;           /* index bits for lencode */
  108     unsigned distbits;          /* index bits for distcode */
  109         /* dynamic table building */
  110     unsigned ncode;             /* number of code length code lengths */
  111     unsigned nlen;              /* number of length code lengths */
  112     unsigned ndist;             /* number of distance code lengths */
  113     unsigned have;              /* number of code lengths in lens[] */
  114     code FAR *next;             /* next available space in codes[] */
  115     unsigned short lens[320];   /* temporary storage for code lengths */
  116     unsigned short work[288];   /* work area for code table building */
  117     code codes[ENOUGH];         /* space for code tables */
  118 };