/
Base64.cpp
265 lines (222 loc) · 11.8 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
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
/*
Copyright (C) 2000-2001 Dawit Alemayehu <adawit@kde.org>
Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
Copyright (C) 2007-2021 Apple Inc. All rights reserved.
Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License (LGPL)
version 2 as published by the Free Software Foundation.
This program 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 General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
This code is based on the java implementation in HTTPClient
package by Ronald Tschalär Copyright (C) 1996-1999.
*/
#include "config.h"
#include <wtf/text/Base64.h>
#include <limits.h>
namespace WTF {
constexpr const char nonAlphabet = -1;
constexpr unsigned encodeMapSize = 64;
constexpr unsigned decodeMapSize = 128;
static const char base64EncMap[encodeMapSize] = {
0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,
0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,
0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2B, 0x2F
};
static const char base64DecMap[decodeMapSize] = {
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, 0x3E, nonAlphabet, nonAlphabet, nonAlphabet, 0x3F,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
0x3C, 0x3D, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, 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, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, 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, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet
};
static const char base64URLEncMap[encodeMapSize] = {
0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,
0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,
0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2D, 0x5F
};
static const char base64URLDecMap[decodeMapSize] = {
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, 0x3E, nonAlphabet, nonAlphabet,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
0x3C, 0x3D, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet,
nonAlphabet, 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, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, 0x3F,
nonAlphabet, 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, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet, nonAlphabet
};
template<typename CharacterType> static void base64EncodeInternal(Span<const uint8_t> inputDataBuffer, Span<CharacterType> destinationDataBuffer, Base64EncodeMap map)
{
ASSERT(destinationDataBuffer.size() > 0);
ASSERT(calculateBase64EncodedSize(inputDataBuffer.size(), map) == destinationDataBuffer.size());
auto encodeMap = (map == Base64EncodeMap::URL) ? base64URLEncMap : base64EncMap;
unsigned sidx = 0;
unsigned didx = 0;
if (inputDataBuffer.size() > 1) {
while (sidx < inputDataBuffer.size() - 2) {
destinationDataBuffer[didx++] = encodeMap[ (inputDataBuffer[sidx ] >> 2) & 077];
destinationDataBuffer[didx++] = encodeMap[((inputDataBuffer[sidx + 1] >> 4) & 017) | ((inputDataBuffer[sidx ] << 4) & 077)];
destinationDataBuffer[didx++] = encodeMap[((inputDataBuffer[sidx + 2] >> 6) & 003) | ((inputDataBuffer[sidx + 1] << 2) & 077)];
destinationDataBuffer[didx++] = encodeMap[ inputDataBuffer[sidx + 2] & 077];
sidx += 3;
}
}
if (sidx < inputDataBuffer.size()) {
destinationDataBuffer[didx++] = encodeMap[(inputDataBuffer[sidx] >> 2) & 077];
if (sidx < inputDataBuffer.size() - 1) {
destinationDataBuffer[didx++] = encodeMap[((inputDataBuffer[sidx + 1] >> 4) & 017) | ((inputDataBuffer[sidx] << 4) & 077)];
destinationDataBuffer[didx++] = encodeMap[ (inputDataBuffer[sidx + 1] << 2) & 077];
} else
destinationDataBuffer[didx++] = encodeMap[ (inputDataBuffer[sidx ] << 4) & 077];
}
ASSERT(map != Base64EncodeMap::URL || didx == destinationDataBuffer.size());
while (didx < destinationDataBuffer.size())
destinationDataBuffer[didx++] = '=';
}
template<typename CharacterType> static void base64EncodeInternal(Span<const std::byte> input, Span<CharacterType> destinationDataBuffer, Base64EncodeMap map)
{
base64EncodeInternal(makeSpan(reinterpret_cast<const uint8_t*>(input.data()), input.size()), destinationDataBuffer, map);
}
static Vector<uint8_t> base64EncodeInternal(Span<const std::byte> input, Base64EncodeMap map)
{
auto destinationLength = calculateBase64EncodedSize(input.size(), map);
if (!destinationLength)
return { };
Vector<uint8_t> destinationVector(destinationLength);
base64EncodeInternal(input, makeSpan(destinationVector), map);
return destinationVector;
}
void base64Encode(Span<const std::byte> input, Span<UChar> destination, Base64EncodeMap map)
{
if (!destination.size())
return;
base64EncodeInternal(input, destination, map);
}
void base64Encode(Span<const std::byte> input, Span<LChar> destination, Base64EncodeMap map)
{
if (!destination.size())
return;
base64EncodeInternal(input, destination, map);
}
Vector<uint8_t> base64EncodeToVector(Span<const std::byte> input, Base64EncodeMap map)
{
return base64EncodeInternal(input, map);
}
String base64EncodeToString(Span<const std::byte> input, Base64EncodeMap map)
{
return makeString(base64Encoded(input, map));
}
template<typename T> static std::optional<Vector<uint8_t>> base64DecodeInternal(Span<const T> inputDataBuffer, OptionSet<Base64DecodeOptions> options, Base64DecodeMap map)
{
if (!inputDataBuffer.size())
return Vector<uint8_t> { };
auto decodeMap = (map == Base64DecodeMap::URL) ? base64URLDecMap : base64DecMap;
Vector<uint8_t> destination(inputDataBuffer.size());
unsigned equalsSignCount = 0;
unsigned destinationLength = 0;
for (unsigned idx = 0; idx < inputDataBuffer.size(); ++idx) {
unsigned ch = inputDataBuffer[idx];
if (ch == '=') {
++equalsSignCount;
// There should never be more than 2 padding characters.
if (options.contains(Base64DecodeOptions::ValidatePadding) && equalsSignCount > 2) {
return std::nullopt;
}
} else {
char decodedCharacter = ch < decodeMapSize ? decodeMap[ch] : nonAlphabet;
if (decodedCharacter != nonAlphabet) {
if (equalsSignCount)
return std::nullopt;
destination[destinationLength++] = decodedCharacter;
} else if (!options.contains(Base64DecodeOptions::IgnoreSpacesAndNewLines) || (!isLatin1(ch) || !isASCIISpace(ch) || (options.contains(Base64DecodeOptions::DiscardVerticalTab) && ch == '\v'))) {
return std::nullopt;
}
}
}
// Make sure we shrink back the Vector before returning. destinationLength may be shorter than expected
// in case of error or in case of ignored spaces.
if (destinationLength < destination.size())
destination.shrink(destinationLength);
if (!destinationLength) {
if (equalsSignCount)
return std::nullopt;
return Vector<uint8_t> { };
}
// The should be no padding if length is a multiple of 4.
// We use (destinationLength + equalsSignCount) instead of length because we don't want to account for ignored characters (i.e. spaces).
if (options.contains(Base64DecodeOptions::ValidatePadding) && equalsSignCount && (destinationLength + equalsSignCount) % 4)
return std::nullopt;
// Valid data is (n * 4 + [0,2,3]) characters long.
if ((destinationLength % 4) == 1)
return std::nullopt;
// 4-byte to 3-byte conversion
destinationLength -= (destinationLength + 3) / 4;
if (!destinationLength)
return std::nullopt;
unsigned sidx = 0;
unsigned didx = 0;
if (destinationLength > 1) {
while (didx < destinationLength - 2) {
destination[didx ] = (((destination[sidx ] << 2) & 255) | ((destination[sidx + 1] >> 4) & 003));
destination[didx + 1] = (((destination[sidx + 1] << 4) & 255) | ((destination[sidx + 2] >> 2) & 017));
destination[didx + 2] = (((destination[sidx + 2] << 6) & 255) | (destination[sidx + 3] & 077));
sidx += 4;
didx += 3;
}
}
if (didx < destinationLength)
destination[didx] = (((destination[sidx ] << 2) & 255) | ((destination[sidx + 1] >> 4) & 003));
if (++didx < destinationLength)
destination[didx] = (((destination[sidx + 1] << 4) & 255) | ((destination[sidx + 2] >> 2) & 017));
if (destinationLength < destination.size())
destination.shrink(destinationLength);
return destination;
}
std::optional<Vector<uint8_t>> base64Decode(Span<const std::byte> input, OptionSet<Base64DecodeOptions> options, Base64DecodeMap map)
{
if (input.size() > std::numeric_limits<unsigned>::max())
return std::nullopt;
return base64DecodeInternal(makeSpan(reinterpret_cast<const uint8_t*>(input.data()), input.size()), options, map);
}
std::optional<Vector<uint8_t>> base64Decode(StringView input, OptionSet<Base64DecodeOptions> options, Base64DecodeMap map)
{
unsigned length = input.length();
if (!length || input.is8Bit())
return base64DecodeInternal(makeSpan(input.characters8(), length), options, map);
return base64DecodeInternal(makeSpan(input.characters16(), length), options, map);
}
} // namespace WTF