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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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