1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
* Basic Allocators
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/internal/defalloc.h>
#include <botan/internal/mlock.h>
#include <botan/libstate.h>
#include <cstdlib>
#include <cstring>
namespace Botan {
namespace {
/*
* Perform Memory Allocation
*/
void* do_malloc(u32bit n, bool do_lock)
{
void* ptr = std::malloc(n);
if(!ptr)
return 0;
if(do_lock)
lock_mem(ptr, n);
std::memset(ptr, 0, n);
return ptr;
}
/*
* Perform Memory Deallocation
*/
void do_free(void* ptr, u32bit n, bool do_lock)
{
if(!ptr)
return;
std::memset(ptr, 0, n);
if(do_lock)
unlock_mem(ptr, n);
std::free(ptr);
}
}
/*
* Malloc_Allocator's Allocation
*/
void* Malloc_Allocator::allocate(u32bit n)
{
return do_malloc(n, false);
}
/*
* Malloc_Allocator's Deallocation
*/
void Malloc_Allocator::deallocate(void* ptr, u32bit n)
{
do_free(ptr, n, false);
}
/*
* Locking_Allocator's Allocation
*/
void* Locking_Allocator::alloc_block(u32bit n)
{
return do_malloc(n, true);
}
/*
* Locking_Allocator's Deallocation
*/
void Locking_Allocator::dealloc_block(void* ptr, u32bit n)
{
do_free(ptr, n, true);
}
/*
* Get an allocator
*/
Allocator* Allocator::get(bool locking)
{
std::string type = "";
if(!locking)
type = "malloc";
Allocator* alloc = global_state().get_allocator(type);
if(alloc)
return alloc;
throw Exception("Couldn't find an allocator to use in get_allocator");
}
}
|
