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