2
Copyright (C) 2000-2001 Dawit Alemayehu <adawit@kde.org>
3
Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
4
Copyright (C) 2007 Apple Inc. All rights reserved.
6
This program is free software; you can redistribute it and/or modify
7
it under the terms of the GNU Lesser General Public License (LGPL)
8
version 2 as published by the Free Software Foundation.
10
This program is distributed in the hope that it will be useful,
11
but WITHOUT ANY WARRANTY; without even the implied warranty of
12
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13
GNU General Public License for more details.
15
You should have received a copy of the GNU Library General Public
16
License along with this program; if not, write to the Free Software
17
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19
This code is based on the java implementation in HTTPClient
20
package by Ronald Tschalär Copyright (C) 1996-1999.
26
#include <wtf/Platform.h>
27
#include <wtf/StringExtras.h>
31
static const char base64EncMap[64] = {
32
0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
33
0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
34
0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
35
0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
36
0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,
37
0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,
38
0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,
39
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2B, 0x2F
42
static const char base64DecMap[128] = {
43
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
44
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
45
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
47
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48
0x00, 0x00, 0x00, 0x3E, 0x00, 0x00, 0x00, 0x3F,
49
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
50
0x3C, 0x3D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
51
0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
52
0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
53
0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
54
0x17, 0x18, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
55
0x00, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
56
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
57
0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
58
0x31, 0x32, 0x33, 0x00, 0x00, 0x00, 0x00, 0x00
61
void base64Encode(const Vector<char>& in, Vector<char>& out, bool insertLFs)
67
// If the input string is pathologically large, just return nothing.
68
// Note: Keep this in sync with the "out_len" computation below.
69
// Rather than being perfectly precise, this is a bit conservative.
70
const unsigned maxInputBufferSize = UINT_MAX / 77 * 76 / 4 * 3 - 2;
71
if (in.size() > maxInputBufferSize)
76
const char* data = in.data();
77
const unsigned len = in.size();
79
unsigned out_len = ((len + 2) / 3) * 4;
81
// Deal with the 76 character per line limit specified in RFC 2045.
82
insertLFs = (insertLFs && out_len > 76);
84
out_len += ((out_len - 1) / 76);
89
// 3-byte to 4-byte conversion + 0-63 to ascii printable conversion
91
while (sidx < len - 2) {
93
if (count && (count % 76) == 0)
97
out[didx++] = base64EncMap[(data[sidx] >> 2) & 077];
98
out[didx++] = base64EncMap[(data[sidx + 1] >> 4) & 017 | (data[sidx] << 4) & 077];
99
out[didx++] = base64EncMap[(data[sidx + 2] >> 6) & 003 | (data[sidx + 1] << 2) & 077];
100
out[didx++] = base64EncMap[data[sidx + 2] & 077];
106
if (insertLFs && (count > 0) && (count % 76) == 0)
109
out[didx++] = base64EncMap[(data[sidx] >> 2) & 077];
110
if (sidx < len - 1) {
111
out[didx++] = base64EncMap[(data[sidx + 1] >> 4) & 017 | (data[sidx] << 4) & 077];
112
out[didx++] = base64EncMap[(data[sidx + 1] << 2) & 077];
114
out[didx++] = base64EncMap[(data[sidx] << 4) & 077];
118
while (didx < out.size()) {
124
bool base64Decode(const Vector<char>& in, Vector<char>& out)
130
// If the input string is pathologically large, just return nothing.
131
if (in.size() > UINT_MAX)
134
unsigned len = in.size();
135
const char* data = in.data();
137
while (len && data[len-1] == '=')
141
for (unsigned idx = 0; idx < len; idx++) {
142
unsigned char ch = data[idx];
143
if ((ch > 47 && ch < 58) || (ch > 64 && ch < 91) || (ch > 96 && ch < 123) || ch == '+' || ch == '/' || ch == '=')
144
out[idx] = base64DecMap[ch];
149
// 4-byte to 3-byte conversion
150
unsigned outLen = len - ((len + 3) / 4);
151
if (!outLen || ((outLen + 2) / 3) * 4 < len)
157
while (didx < outLen - 2) {
158
out[didx] = (((out[sidx] << 2) & 255) | ((out[sidx + 1] >> 4) & 003));
159
out[didx + 1] = (((out[sidx + 1] << 4) & 255) | ((out[sidx + 2] >> 2) & 017));
160
out[didx + 2] = (((out[sidx + 2] << 6) & 255) | (out[sidx + 3] & 077));
167
out[didx] = (((out[sidx] << 2) & 255) | ((out[sidx + 1] >> 4) & 003));
170
out[didx] = (((out[sidx + 1] << 4) & 255) | ((out[sidx + 2] >> 2) & 017));
172
if (outLen < out.size())