1*44bedb31SLionel Sambuc /* $NetBSD: inflate9.h,v 1.1.1.1 2006/01/14 20:10:51 christos Exp $ */ 2*44bedb31SLionel Sambuc 3*44bedb31SLionel Sambuc /* inflate9.h -- internal inflate state definition 4*44bedb31SLionel Sambuc * Copyright (C) 1995-2003 Mark Adler 5*44bedb31SLionel Sambuc * For conditions of distribution and use, see copyright notice in zlib.h 6*44bedb31SLionel Sambuc */ 7*44bedb31SLionel Sambuc 8*44bedb31SLionel Sambuc /* WARNING: this file should *not* be used by applications. It is 9*44bedb31SLionel Sambuc part of the implementation of the compression library and is 10*44bedb31SLionel Sambuc subject to change. Applications should only use zlib.h. 11*44bedb31SLionel Sambuc */ 12*44bedb31SLionel Sambuc 13*44bedb31SLionel Sambuc /* Possible inflate modes between inflate() calls */ 14*44bedb31SLionel Sambuc typedef enum { 15*44bedb31SLionel Sambuc TYPE, /* i: waiting for type bits, including last-flag bit */ 16*44bedb31SLionel Sambuc STORED, /* i: waiting for stored size (length and complement) */ 17*44bedb31SLionel Sambuc TABLE, /* i: waiting for dynamic block table lengths */ 18*44bedb31SLionel Sambuc LEN, /* i: waiting for length/lit code */ 19*44bedb31SLionel Sambuc DONE, /* finished check, done -- remain here until reset */ 20*44bedb31SLionel Sambuc BAD /* got a data error -- remain here until reset */ 21*44bedb31SLionel Sambuc } inflate_mode; 22*44bedb31SLionel Sambuc 23*44bedb31SLionel Sambuc /* 24*44bedb31SLionel Sambuc State transitions between above modes - 25*44bedb31SLionel Sambuc 26*44bedb31SLionel Sambuc (most modes can go to the BAD mode -- not shown for clarity) 27*44bedb31SLionel Sambuc 28*44bedb31SLionel Sambuc Read deflate blocks: 29*44bedb31SLionel Sambuc TYPE -> STORED or TABLE or LEN or DONE 30*44bedb31SLionel Sambuc STORED -> TYPE 31*44bedb31SLionel Sambuc TABLE -> LENLENS -> CODELENS -> LEN 32*44bedb31SLionel Sambuc Read deflate codes: 33*44bedb31SLionel Sambuc LEN -> LEN or TYPE 34*44bedb31SLionel Sambuc */ 35*44bedb31SLionel Sambuc 36*44bedb31SLionel Sambuc /* state maintained between inflate() calls. Approximately 7K bytes. */ 37*44bedb31SLionel Sambuc struct inflate_state { 38*44bedb31SLionel Sambuc /* sliding window */ 39*44bedb31SLionel Sambuc unsigned char FAR *window; /* allocated sliding window, if needed */ 40*44bedb31SLionel Sambuc /* dynamic table building */ 41*44bedb31SLionel Sambuc unsigned ncode; /* number of code length code lengths */ 42*44bedb31SLionel Sambuc unsigned nlen; /* number of length code lengths */ 43*44bedb31SLionel Sambuc unsigned ndist; /* number of distance code lengths */ 44*44bedb31SLionel Sambuc unsigned have; /* number of code lengths in lens[] */ 45*44bedb31SLionel Sambuc code FAR *next; /* next available space in codes[] */ 46*44bedb31SLionel Sambuc unsigned short lens[320]; /* temporary storage for code lengths */ 47*44bedb31SLionel Sambuc unsigned short work[288]; /* work area for code table building */ 48*44bedb31SLionel Sambuc code codes[ENOUGH]; /* space for code tables */ 49*44bedb31SLionel Sambuc }; 50