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function Unescape(const s: AnsiString): widestring;
var
i: Integer;
j: Integer;
c: Integer;
begin
// Make result at least large enough. This prevents too many reallocs
SetLength(Result, Length(s));
i := 1;
j := 1;
while i <= Length(s) do begin
if s[i] = '\' then begin
if i < Length(s) then begin
// escaped backslash?
if s[i + 1] = '\' then begin
Result[j] := '\';
inc(i, 2);
end
// convert hex number to WideChar
else if (s[i + 1] = 'u') and (i + 1 + 4 <= Length(s))
and TryStrToInt('$' + string(Copy(s, i + 2, 4)), c) then begin
inc(i, 6);
Result[j] := WideChar(c);
end else begin
raise Exception.CreateFmt('Invalid code at position %d', [i]);
end;
end else begin
raise Exception.Create('Unexpected end of string');
end;
end else begin
Result[j] := WideChar(s[i]);
inc(i);
end;
inc(j);
end;
// Trim result in case we reserved too much space
SetLength(Result, j - 1);
end;
Это не вирус. Просто в Delphi 7 не завезли JSon.