1/*
2 * Copyright (c) 2012 Apple Inc. All Rights Reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24#ifndef CommonNumerics_cn_globals_h
25#define CommonNumerics_cn_globals_h
26
27
28/*
29 *  cn_globals.h - CommonNumerics global DATA
30 */
31
32#include <asl.h>
33#include <dispatch/dispatch.h>
34#include "crc.h"
35#include "basexx.h"
36#include "CommonCRC.h"
37
38#if __has_include(<os/alloc_once_private.h>)
39#include <os/alloc_once_private.h>
40#if defined(OS_ALLOC_ONCE_KEY_LIBCOMMONNUMERICS) && !defined(KERNEL)
41#define _LIBCOMMONNUMERICS_HAS_ALLOC_ONCE 1
42#endif
43#endif
44
45#define CN_SUPPORTED_CRCS kCN_CRC_64_ECMA_182+1
46#define CN_STANDARD_BASE_ENCODERS kCNEncodingBase16+1
47
48struct cn_globals_s {
49	// CommonCRC.c
50    dispatch_once_t crc_init;
51    crcInfo crcSelectionTab[CN_SUPPORTED_CRCS];
52    dispatch_once_t basexx_init;
53    BaseEncoderFrame encoderTab[CN_STANDARD_BASE_ENCODERS];
54};
55typedef struct cn_globals_s *cn_globals_t;
56
57__attribute__((__pure__))
58static inline cn_globals_t
59_cn_globals(void) {
60#if _LIBCOMMONNUMERICS_HAS_ALLOC_ONCE
61	return (cn_globals_t) os_alloc_once(OS_ALLOC_ONCE_KEY_LIBCOMMONNUMERICS,
62                                        sizeof(struct cn_globals_s),
63                                        NULL);
64#else
65	static struct cn_globals_s storage;
66	return &storage;
67#endif
68}
69
70#endif
71