external/zlib-1.2.11/inflate.h
changeset 521 9ed2f7d4a251
     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/external/zlib-1.2.11/inflate.h	Sat Oct 21 21:05:43 2017 -0700
     1.3 @@ -0,0 +1,125 @@
     1.4 +/* inflate.h -- internal inflate state definition
     1.5 + * Copyright (C) 1995-2016 Mark Adler
     1.6 + * For conditions of distribution and use, see copyright notice in zlib.h
     1.7 + */
     1.8 +
     1.9 +/* WARNING: this file should *not* be used by applications. It is
    1.10 +   part of the implementation of the compression library and is
    1.11 +   subject to change. Applications should only use zlib.h.
    1.12 + */
    1.13 +
    1.14 +/* define NO_GZIP when compiling if you want to disable gzip header and
    1.15 +   trailer decoding by inflate().  NO_GZIP would be used to avoid linking in
    1.16 +   the crc code when it is not needed.  For shared libraries, gzip decoding
    1.17 +   should be left enabled. */
    1.18 +#ifndef NO_GZIP
    1.19 +#  define GUNZIP
    1.20 +#endif
    1.21 +
    1.22 +/* Possible inflate modes between inflate() calls */
    1.23 +typedef enum {
    1.24 +    HEAD = 16180,   /* i: waiting for magic header */
    1.25 +    FLAGS,      /* i: waiting for method and flags (gzip) */
    1.26 +    TIME,       /* i: waiting for modification time (gzip) */
    1.27 +    OS,         /* i: waiting for extra flags and operating system (gzip) */
    1.28 +    EXLEN,      /* i: waiting for extra length (gzip) */
    1.29 +    EXTRA,      /* i: waiting for extra bytes (gzip) */
    1.30 +    NAME,       /* i: waiting for end of file name (gzip) */
    1.31 +    COMMENT,    /* i: waiting for end of comment (gzip) */
    1.32 +    HCRC,       /* i: waiting for header crc (gzip) */
    1.33 +    DICTID,     /* i: waiting for dictionary check value */
    1.34 +    DICT,       /* waiting for inflateSetDictionary() call */
    1.35 +        TYPE,       /* i: waiting for type bits, including last-flag bit */
    1.36 +        TYPEDO,     /* i: same, but skip check to exit inflate on new block */
    1.37 +        STORED,     /* i: waiting for stored size (length and complement) */
    1.38 +        COPY_,      /* i/o: same as COPY below, but only first time in */
    1.39 +        COPY,       /* i/o: waiting for input or output to copy stored block */
    1.40 +        TABLE,      /* i: waiting for dynamic block table lengths */
    1.41 +        LENLENS,    /* i: waiting for code length code lengths */
    1.42 +        CODELENS,   /* i: waiting for length/lit and distance code lengths */
    1.43 +            LEN_,       /* i: same as LEN below, but only first time in */
    1.44 +            LEN,        /* i: waiting for length/lit/eob code */
    1.45 +            LENEXT,     /* i: waiting for length extra bits */
    1.46 +            DIST,       /* i: waiting for distance code */
    1.47 +            DISTEXT,    /* i: waiting for distance extra bits */
    1.48 +            MATCH,      /* o: waiting for output space to copy string */
    1.49 +            LIT,        /* o: waiting for output space to write literal */
    1.50 +    CHECK,      /* i: waiting for 32-bit check value */
    1.51 +    LENGTH,     /* i: waiting for 32-bit length (gzip) */
    1.52 +    DONE,       /* finished check, done -- remain here until reset */
    1.53 +    BAD,        /* got a data error -- remain here until reset */
    1.54 +    MEM,        /* got an inflate() memory error -- remain here until reset */
    1.55 +    SYNC        /* looking for synchronization bytes to restart inflate() */
    1.56 +} inflate_mode;
    1.57 +
    1.58 +/*
    1.59 +    State transitions between above modes -
    1.60 +
    1.61 +    (most modes can go to BAD or MEM on error -- not shown for clarity)
    1.62 +
    1.63 +    Process header:
    1.64 +        HEAD -> (gzip) or (zlib) or (raw)
    1.65 +        (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT ->
    1.66 +                  HCRC -> TYPE
    1.67 +        (zlib) -> DICTID or TYPE
    1.68 +        DICTID -> DICT -> TYPE
    1.69 +        (raw) -> TYPEDO
    1.70 +    Read deflate blocks:
    1.71 +            TYPE -> TYPEDO -> STORED or TABLE or LEN_ or CHECK
    1.72 +            STORED -> COPY_ -> COPY -> TYPE
    1.73 +            TABLE -> LENLENS -> CODELENS -> LEN_
    1.74 +            LEN_ -> LEN
    1.75 +    Read deflate codes in fixed or dynamic block:
    1.76 +                LEN -> LENEXT or LIT or TYPE
    1.77 +                LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
    1.78 +                LIT -> LEN
    1.79 +    Process trailer:
    1.80 +        CHECK -> LENGTH -> DONE
    1.81 + */
    1.82 +
    1.83 +/* State maintained between inflate() calls -- approximately 7K bytes, not
    1.84 +   including the allocated sliding window, which is up to 32K bytes. */
    1.85 +struct inflate_state {
    1.86 +    z_streamp strm;             /* pointer back to this zlib stream */
    1.87 +    inflate_mode mode;          /* current inflate mode */
    1.88 +    int last;                   /* true if processing last block */
    1.89 +    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip,
    1.90 +                                   bit 2 true to validate check value */
    1.91 +    int havedict;               /* true if dictionary provided */
    1.92 +    int flags;                  /* gzip header method and flags (0 if zlib) */
    1.93 +    unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */
    1.94 +    unsigned long check;        /* protected copy of check value */
    1.95 +    unsigned long total;        /* protected copy of output count */
    1.96 +    gz_headerp head;            /* where to save gzip header information */
    1.97 +        /* sliding window */
    1.98 +    unsigned wbits;             /* log base 2 of requested window size */
    1.99 +    unsigned wsize;             /* window size or zero if not using window */
   1.100 +    unsigned whave;             /* valid bytes in the window */
   1.101 +    unsigned wnext;             /* window write index */
   1.102 +    unsigned char FAR *window;  /* allocated sliding window, if needed */
   1.103 +        /* bit accumulator */
   1.104 +    unsigned long hold;         /* input bit accumulator */
   1.105 +    unsigned bits;              /* number of bits in "in" */
   1.106 +        /* for string and stored block copying */
   1.107 +    unsigned length;            /* literal or length of data to copy */
   1.108 +    unsigned offset;            /* distance back to copy string from */
   1.109 +        /* for table and code decoding */
   1.110 +    unsigned extra;             /* extra bits needed */
   1.111 +        /* fixed and dynamic code tables */
   1.112 +    code const FAR *lencode;    /* starting table for length/literal codes */
   1.113 +    code const FAR *distcode;   /* starting table for distance codes */
   1.114 +    unsigned lenbits;           /* index bits for lencode */
   1.115 +    unsigned distbits;          /* index bits for distcode */
   1.116 +        /* dynamic table building */
   1.117 +    unsigned ncode;             /* number of code length code lengths */
   1.118 +    unsigned nlen;              /* number of length code lengths */
   1.119 +    unsigned ndist;             /* number of distance code lengths */
   1.120 +    unsigned have;              /* number of code lengths in lens[] */
   1.121 +    code FAR *next;             /* next available space in codes[] */
   1.122 +    unsigned short lens[320];   /* temporary storage for code lengths */
   1.123 +    unsigned short work[288];   /* work area for code table building */
   1.124 +    code codes[ENOUGH];         /* space for code tables */
   1.125 +    int sane;                   /* if false, allow invalid distance too far */
   1.126 +    int back;                   /* bits back of last unprocessed length/lit */
   1.127 +    unsigned was;               /* initial length of match */
   1.128 +};