1/*
2 *  cc.h
3 *  corecrypto
4 *
5 *  Created by Michael Brouwer on 12/16/10.
6 *  Copyright 2010,2011 Apple Inc. All rights reserved.
7 *
8 */
9
10#ifndef _CORECRYPTO_CC_H_
11#define _CORECRYPTO_CC_H_
12
13#include <corecrypto/cc_config.h>
14#include <string.h>
15#include <stdint.h>
16
17#if CC_KERNEL
18#include <kern/assert.h>
19#else
20#include <assert.h>
21#include <stdio.h>
22#endif
23
24/* Declare a struct element with a guarenteed alignment of _alignment_.
25   The resulting struct can be used to create arrays that are aligned by
26   a certain amount.  */
27#define cc_aligned_struct(_alignment_)  \
28    typedef struct { \
29        uint8_t b[_alignment_]; \
30    } __attribute__((aligned(_alignment_)))
31
32/* number of array elements used in a cc_ctx_decl */
33#define cc_ctx_n(_type_, _size_) ((_size_ + sizeof(_type_) - 1) / sizeof(_type_))
34
35/* sizeof of a context declared with cc_ctx_decl */
36#define cc_ctx_sizeof(_type_, _size_) sizeof(_type_[cc_ctx_n(_type_, _size_)])
37
38#define cc_ctx_decl(_type_, _size_, _name_)  \
39    _type_ _name_[cc_ctx_n(_type_, _size_)]
40
41#if CC_HAS_BZERO
42#define cc_zero(_size_,_data_) bzero((_data_), (_size_))
43#else
44/* Alternate version if you don't have bzero. */
45#define cc_zero(_size_,_data_) memset((_data_),0 ,(_size_))
46#endif
47
48#if CC_KERNEL
49#define cc_printf(x...) printf(x)
50#else
51#define cc_printf(x...) fprintf(stderr, x)
52#endif
53
54#define cc_assert(x) assert(x)
55
56#define cc_copy(_size_, _dst_, _src_) memcpy(_dst_, _src_, _size_)
57
58CC_INLINE CC_NONNULL2 CC_NONNULL3 CC_NONNULL4
59void cc_xor(size_t size, void *r, const void *s, const void *t) {
60    uint8_t *_r=(uint8_t *)r;
61    const uint8_t *_s=(uint8_t *)s;
62    const uint8_t *_t=(uint8_t *)t;
63    while (size--) {
64        _r[size] = _s[size] ^ _t[size];
65    }
66}
67
68/* Exchange S and T of any type.  NOTE: Both and S and T are evaluated
69   mutliple times and MUST NOT be expressions. */
70#define CC_SWAP(S,T)  do { \
71    __typeof__(S) _cc_swap_tmp = S; S = T; T = _cc_swap_tmp; \
72} while(0)
73
74/* Return the maximum value between S and T. */
75#define CC_MAX(S, T) ({__typeof__(S) _cc_max_s = S; __typeof__(T) _cc_max_t = T; _cc_max_s > _cc_max_t ? _cc_max_s : _cc_max_t;})
76
77/* Return the minimum value between S and T. */
78#define CC_MIN(S, T) ({__typeof__(S) _cc_min_s = S; __typeof__(T) _cc_min_t = T; _cc_min_s <= _cc_min_t ? _cc_min_s : _cc_min_t;})
79
80#endif /* _CORECRYPTO_CC_H_ */
81