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