/* * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ /* inflate_util.c -- data and routines common to blocks and codes * Copyright (C) 1995-1998 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; }