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
|
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include "libbase64.h"
#include "codecs.h"
const uint8_t
neon64_base64_table_enc[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
// In the lookup table below, note that the value for '=' (character 61) is
// 254, not 255. This character is used for in-band signaling of the end of
// the datastream, and we will use that later. The characters A-Z, a-z, 0-9
// and + / are mapped to their "decoded" values. The other bytes all map to
// the value 255, which flags them as "invalid input".
const uint8_t
neon64_base64_table_dec[] =
{
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, // 0..15
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, // 16..31
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 254, 62, 255, 63, // 32..47
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 254, 255, 255, // 48..63
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 64..79
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 63, // 80..95
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 96..111
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 255, 255, 255, 255, 255, // 112..127
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, // 128..143
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
};
void
neon64_base64_stream_encode_init (struct neon64_base64_state *state)
{
state->eof = 0;
state->bytes = 0;
state->carry = 0;
}
void
neon64_base64_stream_encode_final
( struct neon64_base64_state *state
, char *out
, size_t *outlen
)
{
uint8_t *o = (uint8_t *)out;
if (state->bytes == 1) {
*o++ = neon64_base64_table_enc[state->carry];
*o++ = '=';
*o++ = '=';
*outlen = 3;
return;
}
if (state->bytes == 2) {
*o++ = neon64_base64_table_enc[state->carry];
*o++ = '=';
*outlen = 2;
return;
}
*outlen = 0;
}
void
neon64_base64_stream_decode_init (struct neon64_base64_state *state)
{
state->eof = 0;
state->bytes = 0;
state->carry = 0;
}
void
neon64_base64_encode
( const char *src
, size_t srclen
, char *out
, size_t *outlen
)
{
size_t s;
size_t t;
struct neon64_base64_state state;
// Init the stream reader:
neon64_base64_stream_encode_init(&state);
// Feed the whole string to the stream reader:
neon64_base64_stream_encode(&state, src, srclen, out, &s);
// Finalize the stream by writing trailer if any:
neon64_base64_stream_encode_final(&state, out + s, &t);
// Final output length is stream length plus tail:
*outlen = s + t;
}
int
neon64_base64_decode
( const char *src
, size_t srclen
, char *out
, size_t *outlen
)
{
struct neon64_base64_state state;
// Init the stream reader:
neon64_base64_stream_decode_init(&state);
// Feed the whole string to the stream reader:
return neon64_base64_stream_decode(&state, src, srclen, out, outlen);
}
|
