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/*
Copyright (C) 2019-2024 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"
void SignalBackup::escapeXmlString(std::string *str) const
{
size_t pos = 0;
while (pos != str->size())
{
if ((*str)[pos] == '&')
{
str->replace(pos, 1, "&");
pos += STRLEN("&");
continue;
}
if ((*str)[pos] == '<')
{
str->replace(pos, 1, "<");
pos += STRLEN("<");
continue;
}
if ((*str)[pos] == '>')
{
str->replace(pos, 1, ">");
pos += STRLEN(">");
continue;
}
if ((*str)[pos] == '"')
{
str->replace(pos, 1, """);
pos += STRLEN(""");
continue;
}
if ((*str)[pos] == '\'')
{
str->replace(pos, 1, "'");
pos += STRLEN("'");
continue;
}
// [^\u0020-\uD7FF] <-- range that's escaped (note the ^)
/*
under \u0020 = control chars (escape, linebreak, etc...)
*/
if ((static_cast<unsigned int>((*str)[pos]) & 0xFF) < 0x20)
{
std::string rep = "&#" + bepaald::toString(static_cast<unsigned int>((*str)[pos]) & 0xFF) + ";";
str->replace(pos, 1, rep);
pos += rep.length();
continue;
}
/*
If you know that the data is UTF-8, then you just have to check the high bit:
0xxxxxxx = single-byte ASCII character
1xxxxxxx = part of multi-byte character
Or, if you need to distinguish lead/trail bytes:
10xxxxxx = 2nd, 3rd, or 4th byte of multi-byte character
110xxxxx = 1st byte of 2-byte character
1110xxxx = 1st byte of 3-byte character
11110xxx = 1st byte of 4-byte character
*/
/*
Over 0xd7ff.
*/
//0x800 - 0xffff is only 3 byte utf chars, and are represented by utf16 points directly?
if (((*str)[pos] & 0b11110000) == 0b11100000)
{
if (pos + 2 >= str->size())
{
++pos;
continue;
}
uint32_t unicode = 0;
unicode += (static_cast<uint32_t>((*str)[pos] & 0b0001111) << 12);
unicode += (static_cast<uint32_t>((*str)[pos + 1] & 0b0111111) << 6);
unicode += (static_cast<uint32_t>((*str)[pos + 2] & 0b0111111));
std::string rep = "&#" + bepaald::toString(unicode) + ";";
str->replace(pos, 3, rep);
pos += rep.length();
continue;
}
// Beyond 0xffff is only 4 byte utf chars
if (((*str)[pos] & 0b11111000) == 0b11110000) // or 0b11110000
{
if (pos + 3 >= str->size())
{
++pos;
continue;
}
/*
bytes of unicode char:
UTF8: 11110XXX 10XXXXXX 10XXXXXX 10XXXXXX
UNICODE: ........ ...XXX_XX XXXX_XXXX XX_XXXXXX {21}
U' (UNICODE - 0x10000): yyyyyyyyyzzzzzzzzzz
UTF16 LOW: 110110yyyyyyyyyy // DONT REMEMBER WHY IM DOING THIS,
UTF16 HI : 110111zzzzzzzzzz // THE ORIGINAL PROBABLY OUTPUT UTF16? BUT I DONT NEED TO
*/
uint32_t unicode = 0;
unicode += (static_cast<uint32_t>((*str)[pos] & 0b0000111) << 18);
unicode += (static_cast<uint32_t>((*str)[pos + 1] & 0b0111111) << 12);
unicode += (static_cast<uint32_t>((*str)[pos + 2] & 0b0111111) << 6);
unicode += (static_cast<uint32_t>((*str)[pos + 3] & 0b0111111));
//unicode -= 0x10000;
//std::string rep = "&#" + bepaald::toString(0xd800 + (unicode >> 10)) + ";&#" + bepaald::toString(0xdc00 + (unicode & 0x3FF)) + ";";
std::string rep = "&#" + bepaald::toString(unicode) + ";";
str->replace(pos, 4, rep);
pos += rep.length();
continue;
}
++pos;
}
}
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