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
|
/*
Copyright (C) 2024 Selwin van Dijk
This file is part of signalbackup-tools.
signalbackup-tools is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
signalbackup-tools 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 General Public License
along with signalbackup-tools. If not, see <https://www.gnu.org/licenses/>.
*/
#include "signalbackup.ih"
#include "../common_bytes.h"
std::string SignalBackup::utf8BytesToHexString(unsigned char const *const data, size_t data_size) const
{
// NOTE THIS IS NOT GENERIC UTF-8 CONVERSION, THIS
// DATA IS GUARANTEED TO HAVE ONLY SINGLE- AND TWO-BYTE
// CHARS (NO 3 OR 4-BYTE). THE TWO-BYTE CHARS NEVER
// CONTAIN MORE THAN TWO BITS OF DATA
unsigned char output[16]{0};
unsigned int outputpos = 0;
for (unsigned int i = 0; i < data_size; ++i)
{
if (outputpos >= 16) [[unlikely]]
return std::string();
if ((data[i] & 0b10000000) == 0) // single byte char
output[outputpos++] += data[i];
else // 2 byte char
output[outputpos++] = ((data[i] & 0b00000011) << 6) | (data[i + 1] & 0b00111111), ++i;
}
return bepaald::bytesToHexString(output, 16, true);
}
|
