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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/* buffer.c
*
* A bare-bones string stream.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 Niels Mller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "buffer.h"
int
nettle_buffer_grow(struct nettle_buffer *buffer,
unsigned length)
{
assert(buffer->size <= buffer->alloc);
if (buffer->size + length > buffer->alloc)
{
unsigned alloc;
uint8_t *p;
if (!buffer->realloc)
return 0;
alloc = buffer->alloc * 2 + length + 100;
p = buffer->realloc(buffer->realloc_ctx, buffer->contents, alloc);
if (!p)
return 0;
buffer->contents = p;
buffer->alloc = alloc;
}
return 1;
}
void
nettle_buffer_init_realloc(struct nettle_buffer *buffer,
void *realloc_ctx,
nettle_realloc_func realloc)
{
buffer->contents = NULL;
buffer->alloc = 0;
buffer->realloc = realloc;
buffer->realloc_ctx = realloc_ctx;
buffer->size = 0;
}
void
nettle_buffer_init_size(struct nettle_buffer *buffer,
unsigned length, uint8_t *space)
{
buffer->contents = space;
buffer->alloc = length;
buffer->realloc = NULL;
buffer->realloc_ctx = NULL;
buffer->size = 0;
}
void
nettle_buffer_clear(struct nettle_buffer *buffer)
{
if (buffer->realloc)
buffer->realloc(buffer->realloc_ctx, buffer->contents, 0);
buffer->contents = NULL;
buffer->alloc = 0;
buffer->size = 0;
}
void
nettle_buffer_reset(struct nettle_buffer *buffer)
{
buffer->size = 0;
}
uint8_t *
nettle_buffer_space(struct nettle_buffer *buffer,
unsigned length)
{
uint8_t *p;
if (!nettle_buffer_grow(buffer, length))
return NULL;
p = buffer->contents + buffer->size;
buffer->size += length;
return p;
}
int
nettle_buffer_write(struct nettle_buffer *buffer,
unsigned length, const uint8_t *data)
{
uint8_t *p = nettle_buffer_space(buffer, length);
if (p)
{
memcpy(p, data, length);
return 1;
}
else
return 0;
}
int
nettle_buffer_copy(struct nettle_buffer *dst,
const struct nettle_buffer *src)
{
return nettle_buffer_write(dst, src->size, src->contents);
}
|
