forked from rdkcmf/rdk-aamp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
_base64.cpp
178 lines (167 loc) · 5.21 KB
/
_base64.cpp
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/*
* If not stated otherwise in this file or this component's license file the
* following copyright and licenses apply:
*
* Copyright 2018 RDK Management
*
* 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.
*/
/**
* @file _base64.cpp
* @brief optimized pair of base64 encode/decode implementations
*/
#include "_base64.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
/**
* @brief convert blob of binary data to ascii base64-encoded equivalent
* @param src pointer to first byte of binary data to be encoded
* @param len number of bytes to encode
* @retval pointer to malloc'd cstring containing base64 encoded version of string
* @retval NULL if insufficient memory to allocate base64-encoded copy
* @note caller responsible for freeing returned cstring
*/
char *base64_Encode(const unsigned char *src, size_t len)
{
static const char *mBase64IndexToChar =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789"
"+/"; // note: some older implementations use "-" instead of "/"
size_t outLen = ((len + 2) / 3) * 4;
char *outData = (char *)malloc(1 + outLen);
if( outData )
{ // aaaaaa aabbbb bbbbcc cccccc
char *dst = outData;
outData[outLen] = 0x00;
for (;;)
{
if (len == 0) break;
int in0 = src[0] >> 2;
int in1 = (src[0] & 0x3) << 4;
dst[0] = mBase64IndexToChar[in0];
dst[1] = mBase64IndexToChar[in1];
len--;
if (len == 0)
{
dst[2] = '=';
dst[3] = '=';
break;
}
in1 |= (src[1] >> 4);
int in2 = (src[1] & 0xf) << 2;
dst[1] = mBase64IndexToChar[in1];
dst[2] = mBase64IndexToChar[in2];
len--;
if (len == 0)
{
dst[3] = '=';
break;
}
in2 |= src[2] >> 6;
int in3 = src[2] & 0x3f;
dst[2] = mBase64IndexToChar[in2];
dst[3] = mBase64IndexToChar[in3];
len--;
src += 3;
dst += 4;
}
}
return outData;
}
/**
* @brief decode base64 encoded data to binary equivalent
* @param src pointer to cstring containing base64-encoded data
* @param len receives byte length of returned pointer, or zero upon failure
* @retval pointer to malloc'd memory containing decoded binary data
* @retval NULL if insufficient memory to allocate base64-decoded data
* @note caller responsible for freeing returned data
*/
unsigned char *base64_Decode(const char *src, size_t *len, size_t srcLen)
{
static const signed char mBase64CharToIndex[256] =
{
/*
Generated using:
static int CodeToIndex( char c )
{
if (c >= 'A' && c <= 'Z') return c - 'A';
if (c >= 'a' && c <= 'z') return (c - 'a') + 26;
if (c >= '0' && c <= '9') return (c - '0') + 26 * 2;
if (c == '+') return 62;
if (c == '-') return 63;
if (c == '/') return 63; // new
return -1; // error
}
*/
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 63, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 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, -1, -1, -1, -1, -1,
-1, 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, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
size_t numChars = (srcLen / 4) * 3; // initially round up to nearest 4 bytes
unsigned char *outData = (unsigned char *)malloc(numChars); // 5538
if (outData)
{
// memset(outData, 0x00, numChars); // not-needed
unsigned char *dst = outData;
const char *finish = src + srcLen;
while (src < finish)
{ // aaaaaa aabbbb bbbbcc cccccc
int data0 = mBase64CharToIndex[(unsigned char)src[0]];
int data1 = mBase64CharToIndex[(unsigned char)src[1]];
int data2 = mBase64CharToIndex[(unsigned char)src[2]];
int data3 = mBase64CharToIndex[(unsigned char)src[3]];
*dst++ = (data0 << 2) | (data1 >> 4);
if (data2 < 0)
{
numChars -= 2;
break;
}
*dst++ = (data1 << 4) | (data2 >> 2);
if (data3 < 0)
{
numChars--;
break;
}
*dst++ = (data2 << 6) | (data3);
src += 4;
}
*len = numChars; // 5536
}
else
{ // insufficient memory
*len = 0;
}
return outData;
}
unsigned char *base64_Decode(const char *src, size_t *len)
{
return base64_Decode(src, len, strlen(src));
}
/**
* @}
*/