| 1 | /* infutil.h -- types and macros common to blocks and codes
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| 2 | * Copyright (C) 1995-2002 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 | #ifndef _INFUTIL_H
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| 12 | #define _INFUTIL_H
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| 13 |
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| 14 | typedef enum {
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| 15 | TYPE, /* get type bits (3, including end bit) */
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| 16 | LENS, /* get lengths for stored */
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| 17 | STORED, /* processing stored block */
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| 18 | TABLE, /* get table lengths */
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| 19 | BTREE, /* get bit lengths tree for a dynamic block */
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| 20 | DTREE, /* get length, distance trees for a dynamic block */
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| 21 | CODES, /* processing fixed or dynamic block */
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| 22 | DRY, /* output remaining window bytes */
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| 23 | DONE, /* finished last block, done */
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| 24 | BAD} /* got a data error--stuck here */
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| 25 | inflate_block_mode;
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| 26 |
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| 27 | /* inflate blocks semi-private state */
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| 28 | struct inflate_blocks_state {
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| 29 |
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| 30 | /* mode */
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| 31 | inflate_block_mode mode; /* current inflate_block mode */
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| 32 |
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| 33 | /* mode dependent information */
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| 34 | union {
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| 35 | uInt left; /* if STORED, bytes left to copy */
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| 36 | struct {
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| 37 | uInt table; /* table lengths (14 bits) */
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| 38 | uInt index; /* index into blens (or border) */
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| 39 | uIntf *blens; /* bit lengths of codes */
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| 40 | uInt bb; /* bit length tree depth */
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| 41 | inflate_huft *tb; /* bit length decoding tree */
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| 42 | } trees; /* if DTREE, decoding info for trees */
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| 43 | struct {
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| 44 | inflate_codes_statef
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| 45 | *codes;
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| 46 | } decode; /* if CODES, current state */
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| 47 | } sub; /* submode */
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| 48 | uInt last; /* true if this block is the last block */
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