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87 lines
2.0 KiB
87 lines
2.0 KiB
/* inflate_util.c -- data and routines common to blocks and codes |
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* Copyright (C) 1995-2002 Mark Adler |
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* For conditions of distribution and use, see copyright notice in zlib.h |
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*/ |
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#include "zutil.h" |
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#include "infblock.h" |
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#include "inftrees.h" |
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#include "infcodes.h" |
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#include "infutil.h" |
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struct inflate_codes_state {int dummy;}; /* for buggy compilers */ |
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/* And'ing with mask[n] masks the lower n bits */ |
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uInt inflate_mask[17] = { |
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0x0000, |
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0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, |
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0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff |
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}; |
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/* copy as much as possible from the sliding window to the output area */ |
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int inflate_flush(s, z, r) |
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inflate_blocks_statef *s; |
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z_streamp z; |
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int r; |
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{ |
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uInt n; |
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Bytef *p; |
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Bytef *q; |
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/* local copies of source and destination pointers */ |
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p = z->next_out; |
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q = s->read; |
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/* compute number of bytes to copy as far as end of window */ |
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n = (uInt)((q <= s->write ? s->write : s->end) - q); |
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if (n > z->avail_out) n = z->avail_out; |
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if (n && r == Z_BUF_ERROR) r = Z_OK; |
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/* update counters */ |
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z->avail_out -= n; |
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z->total_out += n; |
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/* update check information */ |
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if (s->checkfn != Z_NULL) |
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z->adler = s->check = (*s->checkfn)(s->check, q, n); |
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/* copy as far as end of window */ |
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zmemcpy(p, q, n); |
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p += n; |
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q += n; |
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/* see if more to copy at beginning of window */ |
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if (q == s->end) |
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{ |
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/* wrap pointers */ |
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q = s->window; |
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if (s->write == s->end) |
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s->write = s->window; |
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/* compute bytes to copy */ |
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n = (uInt)(s->write - q); |
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if (n > z->avail_out) n = z->avail_out; |
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if (n && r == Z_BUF_ERROR) r = Z_OK; |
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/* update counters */ |
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z->avail_out -= n; |
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z->total_out += n; |
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/* update check information */ |
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if (s->checkfn != Z_NULL) |
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z->adler = s->check = (*s->checkfn)(s->check, q, n); |
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/* copy */ |
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zmemcpy(p, q, n); |
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p += n; |
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q += n; |
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} |
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/* update pointers */ |
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z->next_out = p; |
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s->read = q; |
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/* done */ |
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return r; |
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}
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