Chris@43: /* inflate9.h -- internal inflate state definition
Chris@43:  * Copyright (C) 1995-2003 Mark Adler
Chris@43:  * For conditions of distribution and use, see copyright notice in zlib.h
Chris@43:  */
Chris@43: 
Chris@43: /* WARNING: this file should *not* be used by applications. It is
Chris@43:    part of the implementation of the compression library and is
Chris@43:    subject to change. Applications should only use zlib.h.
Chris@43:  */
Chris@43: 
Chris@43: /* Possible inflate modes between inflate() calls */
Chris@43: typedef enum {
Chris@43:         TYPE,       /* i: waiting for type bits, including last-flag bit */
Chris@43:         STORED,     /* i: waiting for stored size (length and complement) */
Chris@43:         TABLE,      /* i: waiting for dynamic block table lengths */
Chris@43:             LEN,        /* i: waiting for length/lit code */
Chris@43:     DONE,       /* finished check, done -- remain here until reset */
Chris@43:     BAD         /* got a data error -- remain here until reset */
Chris@43: } inflate_mode;
Chris@43: 
Chris@43: /*
Chris@43:     State transitions between above modes -
Chris@43: 
Chris@43:     (most modes can go to the BAD mode -- not shown for clarity)
Chris@43: 
Chris@43:     Read deflate blocks:
Chris@43:             TYPE -> STORED or TABLE or LEN or DONE
Chris@43:             STORED -> TYPE
Chris@43:             TABLE -> LENLENS -> CODELENS -> LEN
Chris@43:     Read deflate codes:
Chris@43:                 LEN -> LEN or TYPE
Chris@43:  */
Chris@43: 
Chris@43: /* state maintained between inflate() calls.  Approximately 7K bytes. */
Chris@43: struct inflate_state {
Chris@43:         /* sliding window */
Chris@43:     unsigned char FAR *window;  /* allocated sliding window, if needed */
Chris@43:         /* dynamic table building */
Chris@43:     unsigned ncode;             /* number of code length code lengths */
Chris@43:     unsigned nlen;              /* number of length code lengths */
Chris@43:     unsigned ndist;             /* number of distance code lengths */
Chris@43:     unsigned have;              /* number of code lengths in lens[] */
Chris@43:     code FAR *next;             /* next available space in codes[] */
Chris@43:     unsigned short lens[320];   /* temporary storage for code lengths */
Chris@43:     unsigned short work[288];   /* work area for code table building */
Chris@43:     code codes[ENOUGH];         /* space for code tables */
Chris@43: };