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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
|
/*=========================================================================
Program: KWSys - Kitware System Library
Module: $RCSfile$
Copyright (c) Kitware, Inc., Insight Consortium. All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#define KWSYS_IN_BASE64_C
#include "kwsysPrivate.h"
#include KWSYS_HEADER(Base64.h)
/*--------------------------------------------------------------------------*/
static const unsigned char kwsysBase64EncodeTable[65] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
/*--------------------------------------------------------------------------*/
static const unsigned char kwsysBase64DecodeTable[256] =
{
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0x3E,0xFF,0xFF,0xFF,0x3F,
0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,
0x3C,0x3D,0xFF,0xFF,0xFF,0x00,0xFF,0xFF,
0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,
0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,
0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
/*------------------------------------*/
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
};
/*--------------------------------------------------------------------------*/
static unsigned char kwsysBase64EncodeChar(int c)
{
return kwsysBase64EncodeTable[(unsigned char)c];
}
/*--------------------------------------------------------------------------*/
static unsigned char kwsysBase64DecodeChar(unsigned char c)
{
return kwsysBase64DecodeTable[c];
}
/*--------------------------------------------------------------------------*/
/* Encode 3 bytes into a 4 byte string. */
void kwsysBase64_Encode3(const unsigned char *src, unsigned char *dest)
{
dest[0] = kwsysBase64EncodeChar((src[0] >> 2) & 0x3F);
dest[1] = kwsysBase64EncodeChar(((src[0] << 4) & 0x30)|((src[1] >> 4) & 0x0F));
dest[2] = kwsysBase64EncodeChar(((src[1] << 2) & 0x3C)|((src[2] >> 6) & 0x03));
dest[3] = kwsysBase64EncodeChar(src[2] & 0x3F);
}
/*--------------------------------------------------------------------------*/
/* Encode 2 bytes into a 4 byte string. */
void kwsysBase64_Encode2(const unsigned char *src, unsigned char *dest)
{
dest[0] = kwsysBase64EncodeChar((src[0] >> 2) & 0x3F);
dest[1] = kwsysBase64EncodeChar(((src[0] << 4) & 0x30)|((src[1] >> 4) & 0x0F));
dest[2] = kwsysBase64EncodeChar(((src[1] << 2) & 0x3C));
dest[3] = '=';
}
/*--------------------------------------------------------------------------*/
/* Encode 1 bytes into a 4 byte string. */
void kwsysBase64_Encode1(const unsigned char *src, unsigned char *dest)
{
dest[0] = kwsysBase64EncodeChar((src[0] >> 2) & 0x3F);
dest[1] = kwsysBase64EncodeChar(((src[0] << 4) & 0x30));
dest[2] = '=';
dest[3] = '=';
}
/*--------------------------------------------------------------------------*/
/* Encode 'length' bytes from the input buffer and store the
encoded stream into the output buffer. Return the length of the encoded
buffer (output). Note that the output buffer must be allocated by the caller
(length * 1.5 should be a safe estimate). If 'mark_end' is true than an
extra set of 4 bytes is added to the end of the stream if the input is a
multiple of 3 bytes. These bytes are invalid chars and therefore they will
stop the decoder thus enabling the caller to decode a stream without
actually knowing how much data to expect (if the input is not a multiple of
3 bytes then the extra padding needed to complete the encode 4 bytes will
stop the decoding anyway). */
unsigned long kwsysBase64_Encode(const unsigned char *input,
unsigned long length,
unsigned char *output,
int mark_end)
{
const unsigned char *ptr = input;
const unsigned char *end = input + length;
unsigned char *optr = output;
/* Encode complete triplet */
while ((end - ptr) >= 3)
{
kwsysBase64_Encode3(ptr, optr);
ptr += 3;
optr += 4;
}
/* Encodes a 2-byte ending into 3 bytes and 1 pad byte and writes. */
if (end - ptr == 2)
{
kwsysBase64_Encode2(ptr, optr);
optr += 4;
}
/* Encodes a 1-byte ending into 2 bytes and 2 pad bytes */
else if (end - ptr == 1)
{
kwsysBase64_Encode1(ptr, optr);
optr += 4;
}
/* Do we need to mark the end */
else if (mark_end)
{
optr[0] = optr[1] = optr[2] = optr[3] = '=';
optr += 4;
}
return (unsigned long)(optr - output);
}
/*--------------------------------------------------------------------------*/
/* Decode 4 bytes into a 3 byte string. */
int kwsysBase64_Decode3(const unsigned char *src, unsigned char *dest)
{
unsigned char d0, d1, d2, d3;
d0 = kwsysBase64DecodeChar(src[0]);
d1 = kwsysBase64DecodeChar(src[1]);
d2 = kwsysBase64DecodeChar(src[2]);
d3 = kwsysBase64DecodeChar(src[3]);
/* Make sure all characters were valid */
if (d0 == 0xFF || d1 == 0xFF || d2 == 0xFF || d3 == 0xFF)
{
return 0;
}
/* Decode the 3 bytes */
dest[0] = (unsigned char)(((d0 << 2) & 0xFC) | ((d1 >> 4) & 0x03));
dest[1] = (unsigned char)(((d1 << 4) & 0xF0) | ((d2 >> 2) & 0x0F));
dest[2] = (unsigned char)(((d2 << 6) & 0xC0) | ((d3 >> 0) & 0x3F));
/* Return the number of bytes actually decoded */
if (src[2] == '=')
{
return 1;
}
if (src[3] == '=')
{
return 2;
}
return 3;
}
/*--------------------------------------------------------------------------*/
/* Decode bytes from the input buffer and store the decoded stream
into the output buffer until 'length' bytes have been decoded. Return the
real length of the decoded stream (which should be equal to 'length'). Note
that the output buffer must be allocated by the caller. If
'max_input_length' is not null, then it specifies the number of encoded
bytes that should be at most read from the input buffer. In that case the
'length' parameter is ignored. This enables the caller to decode a stream
without actually knowing how much decoded data to expect (of course, the
buffer must be large enough). */
unsigned long kwsysBase64_Decode(const unsigned char *input,
unsigned long length,
unsigned char *output,
unsigned long max_input_length)
{
const unsigned char *ptr = input;
unsigned char *optr = output;
/* Decode complete triplet */
if (max_input_length)
{
const unsigned char *end = input + max_input_length;
while (ptr < end)
{
int len = kwsysBase64_Decode3(ptr, optr);
optr += len;
if(len < 3)
{
return (unsigned long)(optr - output);
}
ptr += 4;
}
}
else
{
unsigned char *oend = output + length;
while ((oend - optr) >= 3)
{
int len = kwsysBase64_Decode3(ptr, optr);
optr += len;
if(len < 3)
{
return (unsigned long)(optr - output);
}
ptr += 4;
}
/* Decode the last triplet */
if (oend - optr == 2)
{
unsigned char temp[3];
int len = kwsysBase64_Decode3(ptr, temp);
optr[0] = temp[0];
optr[1] = temp[1];
optr += (len > 2 ? 2 : len);
}
else if (oend - optr == 1)
{
unsigned char temp[3];
int len = kwsysBase64_Decode3(ptr, temp);
optr[0] = temp[0];
optr += (len > 2 ? 2 : len);
}
}
return (unsigned long)(optr - output);
}
|
