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Issue 29606600: Issue 5146 - Implement DownloadableSubscription parsing in C++ (Closed) Base URL: https://hg.adblockplus.org/adblockpluscore/
Patch Set: Added md5 checksum. Reorganized some code. Created Nov. 28, 2017, 10:46 p.m.
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1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-present eyeo GmbH
4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation.
8 *
9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include "Base64.h"
19
20 static const char base64_alphabet[] = {
21 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
22 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
23 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
24 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
25 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
26 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
27 'w', 'x', 'y', 'z', '0', '1', '2', '3',
28 '4', '5', '6', '7', '8', '9', '+', '/'
29 };
30
31 // Note: this base64 encoding fill with 0 instead of using padding.
32 // ie it is not conformant.
33 OwnedString ToBase64(const uint8_t* buffer, size_t len)
34 {
35 String::size_type length = (len / 3 * 4) + (len % 3 ? 1 : 0);
36 OwnedString output(length);
37 String::size_type outputIndex = 0;
38 uint8_t input[3];
39 for (size_t i = 0; i < len; i += 3)
40 {
41 size_t left = len - i;
42 if (left > 3)
43 left = 3;
44 for (size_t j = 0; j < left; j++)
45 input[j] = *buffer++;
46 switch (left) {
47 case 1:
48 input[1] = 0;
49 case 2:
50 input[2] = 0;
51 }
52
53 output[outputIndex++] = base64_alphabet[input[0] >> 2];
54 output[outputIndex++] = base64_alphabet[((input[0] & 0x03) << 4) + (input[1] >> 4)];
55 output[outputIndex++] = base64_alphabet[((input[1] & 0x0f) << 2) + (input[2] >> 6)];
56 output[outputIndex++] = base64_alphabet[input[2] & 0x3f];
57 }
58
59 return output;
60 }
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