/* inflate.h -- internal inflate state definition+
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 * Copyright (C) 1995-2004 Mark Adler+
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 * For conditions of distribution and use, see copyright notice in zlib.h+
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 */+
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+
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/* WARNING: this file should *not* be used by applications. It is+
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   part of the implementation of the compression library and is+
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   subject to change. Applications should only use zlib.h.+
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 */+
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+
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/* define NO_GZIP when compiling if you want to disable gzip header and+
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   trailer decoding by inflate().  NO_GZIP would be used to avoid linking in+
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   the crc code when it is not needed.  For shared libraries, gzip decoding+
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   should be left enabled. */+
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#ifndef NO_GZIP+
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#  define GUNZIP+
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#endif+
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+
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/* Possible inflate modes between inflate() calls */+
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typedef enum {+
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    HEAD,       /* i: waiting for magic header */+
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    FLAGS,      /* i: waiting for method and flags (gzip) */+
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    TIME,       /* i: waiting for modification time (gzip) */+
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    OS,         /* i: waiting for extra flags and operating system (gzip) */+
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    EXLEN,      /* i: waiting for extra length (gzip) */+
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    EXTRA,      /* i: waiting for extra bytes (gzip) */+
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    NAME,       /* i: waiting for end of file name (gzip) */+
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    COMMENT,    /* i: waiting for end of comment (gzip) */+
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    HCRC,       /* i: waiting for header crc (gzip) */+
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    DICTID,     /* i: waiting for dictionary check value */+
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    DICT,       /* waiting for inflateSetDictionary() call */+
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        TYPE,       /* i: waiting for type bits, including last-flag bit */+
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        TYPEDO,     /* i: same, but skip check to exit inflate on new block */+
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        STORED,     /* i: waiting for stored size (length and complement) */+
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        COPY,       /* i/o: waiting for input or output to copy stored block */+
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        TABLE,      /* i: waiting for dynamic block table lengths */+
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        LENLENS,    /* i: waiting for code length code lengths */+
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        CODELENS,   /* i: waiting for length/lit and distance code lengths */+
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            LEN,        /* i: waiting for length/lit code */+
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            LENEXT,     /* i: waiting for length extra bits */+
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            DIST,       /* i: waiting for distance code */+
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            DISTEXT,    /* i: waiting for distance extra bits */+
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            MATCH,      /* o: waiting for output space to copy string */+
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            LIT,        /* o: waiting for output space to write literal */+
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    CHECK,      /* i: waiting for 32-bit check value */+
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    LENGTH,     /* i: waiting for 32-bit length (gzip) */+
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    DONE,       /* finished check, done -- remain here until reset */+
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    BAD,        /* got a data error -- remain here until reset */+
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    MEM,        /* got an inflate() memory error -- remain here until reset */+
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    SYNC        /* looking for synchronization bytes to restart inflate() */+
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} inflate_mode;+
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+
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/*+
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    State transitions between above modes -+
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+
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    (most modes can go to the BAD or MEM mode -- not shown for clarity)+
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+
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    Process header:+
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        HEAD -> (gzip) or (zlib)+
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        (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME+
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        NAME -> COMMENT -> HCRC -> TYPE+
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        (zlib) -> DICTID or TYPE+
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        DICTID -> DICT -> TYPE+
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    Read deflate blocks:+
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            TYPE -> STORED or TABLE or LEN or CHECK+
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            STORED -> COPY -> TYPE+
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            TABLE -> LENLENS -> CODELENS -> LEN+
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    Read deflate codes:+
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                LEN -> LENEXT or LIT or TYPE+
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                LENEXT -> DIST -> DISTEXT -> MATCH -> LEN+
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                LIT -> LEN+
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    Process trailer:+
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        CHECK -> LENGTH -> DONE+
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 */+
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+
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/* state maintained between inflate() calls.  Approximately 7K bytes. */+
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struct inflate_state {+
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    inflate_mode mode;          /* current inflate mode */+
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    int last;                   /* true if processing last block */+
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    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip */+
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    int havedict;               /* true if dictionary provided */+
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    int flags;                  /* gzip header method and flags (0 if zlib) */+
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    unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */+
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    unsigned long check;        /* protected copy of check value */+
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    unsigned long total;        /* protected copy of output count */+
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    gz_headerp head;            /* where to save gzip header information */+
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        /* sliding window */+
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    unsigned wbits;             /* log base 2 of requested window size */+
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    unsigned wsize;             /* window size or zero if not using window */+
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    unsigned whave;             /* valid bytes in the window */+
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    unsigned write;             /* window write index */+
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    unsigned char FAR *window;  /* allocated sliding window, if needed */+
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        /* bit accumulator */+
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    unsigned long hold;         /* input bit accumulator */+
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    unsigned bits;              /* number of bits in "in" */+
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        /* for string and stored block copying */+
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    unsigned length;            /* literal or length of data to copy */+
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    unsigned offset;            /* distance back to copy string from */+
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        /* for table and code decoding */+
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    unsigned extra;             /* extra bits needed */+
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        /* fixed and dynamic code tables */+
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    code const FAR *lencode;    /* starting table for length/literal codes */+
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    code const FAR *distcode;   /* starting table for distance codes */+
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    unsigned lenbits;           /* index bits for lencode */+
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    unsigned distbits;          /* index bits for distcode */+
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        /* dynamic table building */+
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    unsigned ncode;             /* number of code length code lengths */+
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    unsigned nlen;              /* number of length code lengths */+
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    unsigned ndist;             /* number of distance code lengths */+
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    unsigned have;              /* number of code lengths in lens[] */+
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    code FAR *next;             /* next available space in codes[] */+
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    unsigned short lens[320];   /* temporary storage for code lengths */+
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    unsigned short work[288];   /* work area for code table building */+
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    code codes[ENOUGH];         /* space for code tables */+
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};+
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