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
|
/*
* $Id: hex.c 216 2012-10-16 19:57:01Z aaron $
*/
/************************************************************************
* *
* Copyright (C) 2003 *
* Internet2 *
* All Rights Reserved *
* *
************************************************************************/
/*
* File: hex.c
*
* Author: Jeff W. Boote
* Internet2
*
* Date: Tue Dec 16 15:45:00 MST 2003
*
* Description:
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <I2util/utilP.h>
#include <ctype.h>
/*
* buff must be at least (nbytes*2) +1 long or memory will be over-run.
*/
void
I2HexEncode(
char *buff,
const uint8_t *bytes,
size_t nbytes
)
{
char hex[]="0123456789abcdef";
size_t i;
for(i=0;i<nbytes;i++){
*buff++ = hex[*bytes >> 4];
*buff++ = hex[*bytes++ & 0x0f];
}
*buff = '\0';
}
/*
* Function: I2HexDecode
*
* Description:
* Decode hex chars into bytes. Return True on success, False on error.
*
* It is valid to pass the same memory in for buff and bytes. On
* input buff should hold the hex encoded string, on output the
* memory will hold the bytes. (It will take half the memory...)
*
* In Args:
*
* Out Args:
*
* Scope:
* Returns:
* Side Effect:
*/
I2Boolean
I2HexDecode(
const char *buff,
uint8_t *bytes,
size_t nbytes
)
{
char hex[]="0123456789abcdef";
unsigned int i,j,offset;
char a;
uint8_t byte;
for(i=0;i<nbytes;i++,bytes++){
byte = 0;
for(j=0;(*buff != '\0')&&(j<2);j++,buff++){
a = tolower(*buff);
for(offset=0;offset<sizeof(hex);offset++){
if(a == hex[offset]){
byte |= offset;
if(!j)
byte <<= 4;
goto byteset;
}
}
return False;
byteset:
;
}
*bytes = byte;
}
return True;
}
|
