| 1 | /* inflate_util.c -- data and routines 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 | #include "zutil.h"
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| 7 | #include "infblock.h"
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| 8 | #include "inftrees.h"
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| 9 | #include "infcodes.h"
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| 10 | #include "infutil.h"
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| 11 |
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| 12 | struct inflate_codes_state {int dummy;}; /* for buggy compilers */
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| 13 |
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| 14 | /* And'ing with mask[n] masks the lower n bits */
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| 15 | uInt inflate_mask[17] = {
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| 16 | 0x0000,
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| 17 | 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
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| 18 | 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
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| 19 | };
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| 20 |
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| 21 |
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| 22 | /* copy as much as possible from the sliding window to the output area */
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| 23 | int inflate_flush(s, z, r)
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| 24 | inflate_blocks_statef *s;
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| 25 | z_streamp z;
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| 26 | int r;
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| 27 | {
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| 28 | uInt n;
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| 29 | Bytef *p;
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| 30 | Bytef *q;
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| 31 |
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| 32 | /* local copies of source and destination pointers */
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| 33 | p = z->next_out;
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| 34 | q = s->read;
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| 35 |
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| 36 | /* compute number of bytes to copy as far as end of window */
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| 37 | n = (uInt)((q <= s->write ? s->write : s->end) - q);
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| 38 | if (n > z->avail_out) n = z->avail_out;
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| 39 | if (n && r == Z_BUF_ERROR) r = Z_OK;
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| 40 |
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| 41 | /* update counters */
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| 42 | z->avail_out -= n;
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| 43 | z->total_out += n;
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| 44 |
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