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Skip Unicode tag characters in text processing.

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This commit is contained in:
John Preston 2020-01-21 14:12:41 +03:00
parent 4c165ea446
commit f401e8c085
1 changed files with 20 additions and 0 deletions
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20
ui/text/text.cpp
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@ -760,6 +760,26 @@ void Parser::parseCurrentChar() {
if (_ptr + 1 >= _end || !(_ptr + 1)->isLowSurrogate()) {
return true;
}
const auto ucs4 = QChar::surrogateToUcs4(_ch, *(_ptr + 1));
if (ucs4 >= 0xE0000) {
// Unicode tags are skipped.
// Only place they work is in some flag emoji,
// but in that case they were already parsed as emoji before.
//
// For unknown reason in some unknown cases strings with such
// symbols lead to crashes on some Linux distributions, see
// https://github.com/telegramdesktop/tdesktop/issues/7005
//
// At least one crashing text was starting that way:
//
// 0xd83d 0xdcda 0xdb40 0xdc69 0xdb40 0xdc64 0xdb40 0xdc6a
// 0xdb40 0xdc77 0xdb40 0xdc7f 0x32 ... simple text here ...
//
// or in codepoints:
//
// 0x1f4da 0xe0069 0xe0064 0xe006a 0xe0077 0xe007f 0x32 ...
return true;
}
}
return false;
}();