/* inflate.h -- internal inflate state definition * Copyright (C) 1995-2003 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. *//* define NO_GZIP when compiling if you want to disable gzip header and   trailer decoding by inflate().  NO_GZIP would be used to avoid linking in   the crc code when it is not needed.  For shared libraries, gzip decoding   should be left enabled. */#ifndef NO_GZIP#  define GUNZIP#endif/* Possible inflate modes between inflate() calls */typedef enum {    HEAD,       /* i: waiting for magic header */#ifdef GUNZIP    FLAGS,      /* i: waiting for method and flags (gzip) */    TIME,       /* i: waiting for modification time (gzip) */    OS,         /* i: waiting for extra flags and operating system (gzip) */    EXLEN,      /* i: waiting for extra length (gzip) */    EXTRA,      /* i: waiting for extra bytes (gzip) */    NAME,       /* i: waiting for end of file name (gzip) */    COMMENT,    /* i: waiting for end of comment (gzip) */    HCRC,       /* i: waiting for header crc (gzip) */#endif    DICTID,     /* i: waiting for dictionary check value */    DICT,       /* waiting for inflateSetDictionary() call */        TYPE,       /* i: waiting for type bits, including last-flag bit */        TYPEDO,     /* i: same, but skip check to exit inflate on new block */        STORED,     /* i: waiting for stored size (length and complement) */        COPY,       /* i/o: waiting for input or output to copy stored block */        TABLE,      /* i: waiting for dynamic block table lengths */        LENLENS,    /* i: waiting for code length code lengths */        CODELENS,   /* i: waiting for length/lit and distance code lengths */            LEN,        /* i: waiting for length/lit code */            LENEXT,     /* i: waiting for length extra bits */            DIST,       /* i: waiting for distance code */            DISTEXT,    /* i: waiting for distance extra bits */            MATCH,      /* o: waiting for output space to copy string */            LIT,        /* o: waiting for output space to write literal */    CHECK,      /* i: waiting for 32-bit check value */#ifdef GUNZIP    LENGTH,     /* i: waiting for 32-bit length (gzip) */#endif    DONE,       /* finished check, done -- remain here until reset */    BAD,        /* got a data error -- remain here until reset */    MEM,        /* got an inflate() memory error -- remain here until reset */    SYNC        /* looking for synchronization bytes to restart inflate() */} inflate_mode;/*    State transitions between above modes -    (most modes can go to the BAD or MEM mode -- not shown for clarity)    Process header:        HEAD -> (gzip) or (zlib)        (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME        NAME -> COMMENT -> HCRC -> TYPE        (zlib) -> DICTID or TYPE        DICTID -> DICT -> TYPE    Read deflate blocks:            TYPE -> STORED or TABLE or LEN or CHECK            STORED -> COPY -> TYPE            TABLE -> LENLENS -> CODELENS -> LEN    Read deflate codes:                LEN -> LENEXT or LIT or TYPE                LENEXT -> DIST -> DISTEXT -> MATCH -> LEN                LIT -> LEN    Process trailer:        CHECK -> LENGTH -> DONE *//* state maintained between inflate() calls.  Approximately 7K bytes. */struct inflate_state {    inflate_mode mode;          /* current inflate mode */    int last;                   /* true if processing last block */    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip */    int havedict;               /* true if dictionary provided */    int flags;                  /* gzip header method and flags (0 if zlib) */    unsigned long check;        /* protected copy of check value */    unsigned long total;        /* protected copy of output count */        /* sliding window */    unsigned wbits;             /* log base 2 of requested window size */    unsigned wsize;             /* window size or zero if not using window */    unsigned whave;             /* valid bytes in the window */    unsigned write;             /* window write index */    unsigned char FAR *window;  /* allocated sliding window, if needed */        /* bit accumulator */    unsigned long hold;         /* input bit accumulator */    unsigned bits;              /* number of bits in "in" */        /* for string and stored block copying */    unsigned length;            /* literal or length of data to copy */    unsigned offset;            /* distance back to copy string from */        /* for table and code decoding */    unsigned extra;             /* extra bits needed */        /* fixed and dynamic code tables */    code const FAR *lencode;    /* starting table for length/literal codes */    code const FAR *distcode;   /* starting table for distance codes */    unsigned lenbits;           /* index bits for lencode */    unsigned distbits;          /* index bits for distcode */        /* dynamic table building */    unsigned ncode;             /* number of code length code lengths */    unsigned nlen;              /* number of length code lengths */    unsigned ndist;             /* number of distance code lengths */    unsigned have;              /* number of code lengths in lens[] */    code FAR *next;             /* next available space in codes[] */    unsigned short lens[320];   /* temporary storage for code lengths */    unsigned short work[288];   /* work area for code table building */    code codes[ENOUGH];         /* space for code tables */};