cannam@128: /* inflate9.h -- internal inflate state definition
cannam@128:  * Copyright (C) 1995-2003 Mark Adler
cannam@128:  * For conditions of distribution and use, see copyright notice in zlib.h
cannam@128:  */
cannam@128: 
cannam@128: /* WARNING: this file should *not* be used by applications. It is
cannam@128:    part of the implementation of the compression library and is
cannam@128:    subject to change. Applications should only use zlib.h.
cannam@128:  */
cannam@128: 
cannam@128: /* Possible inflate modes between inflate() calls */
cannam@128: typedef enum {
cannam@128:         TYPE,       /* i: waiting for type bits, including last-flag bit */
cannam@128:         STORED,     /* i: waiting for stored size (length and complement) */
cannam@128:         TABLE,      /* i: waiting for dynamic block table lengths */
cannam@128:             LEN,        /* i: waiting for length/lit code */
cannam@128:     DONE,       /* finished check, done -- remain here until reset */
cannam@128:     BAD         /* got a data error -- remain here until reset */
cannam@128: } inflate_mode;
cannam@128: 
cannam@128: /*
cannam@128:     State transitions between above modes -
cannam@128: 
cannam@128:     (most modes can go to the BAD mode -- not shown for clarity)
cannam@128: 
cannam@128:     Read deflate blocks:
cannam@128:             TYPE -> STORED or TABLE or LEN or DONE
cannam@128:             STORED -> TYPE
cannam@128:             TABLE -> LENLENS -> CODELENS -> LEN
cannam@128:     Read deflate codes:
cannam@128:                 LEN -> LEN or TYPE
cannam@128:  */
cannam@128: 
cannam@128: /* state maintained between inflate() calls.  Approximately 7K bytes. */
cannam@128: struct inflate_state {
cannam@128:         /* sliding window */
cannam@128:     unsigned char FAR *window;  /* allocated sliding window, if needed */
cannam@128:         /* dynamic table building */
cannam@128:     unsigned ncode;             /* number of code length code lengths */
cannam@128:     unsigned nlen;              /* number of length code lengths */
cannam@128:     unsigned ndist;             /* number of distance code lengths */
cannam@128:     unsigned have;              /* number of code lengths in lens[] */
cannam@128:     code FAR *next;             /* next available space in codes[] */
cannam@128:     unsigned short lens[320];   /* temporary storage for code lengths */
cannam@128:     unsigned short work[288];   /* work area for code table building */
cannam@128:     code codes[ENOUGH];         /* space for code tables */
cannam@128: };