| /* 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" |
| |
| struct inflate_codes_state {int dummy;}; /* for buggy compilers */ |
| |
| /* And'ing with mask[n] masks the lower n bits */ |
| 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 */ |
| 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; |
| } |