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{$mode objfpc}{$H+}
uses
{$ifdef unix}
cwstring,
{$endif}
Classes, SysUtils;
function localUnicodeToUTF8(u: cardinal; Buf: PChar): integer;
procedure RaiseInvalidUnicode;
begin
raise Exception.Create('UnicodeToUTF8: invalid unicode: '+IntToStr(u));
end;
begin
case u of
0..$7f:
begin
Result:=1;
Buf[0]:=char(byte(u));
end;
$80..$7ff:
begin
Result:=2;
Buf[0]:=char(byte($c0 or (u shr 6)));
Buf[1]:=char(byte($80 or (u and $3f)));
end;
$800..$ffff:
begin
Result:=3;
Buf[0]:=char(byte($e0 or (u shr 12)));
Buf[1]:=char(byte((u shr 6) and $3f) or $80);
Buf[2]:=char(byte(u and $3f) or $80);
end;
$10000..$10ffff:
begin
Result:=4;
Buf[0]:=char(byte($f0 or (u shr 18)));
Buf[1]:=char(byte((u shr 12) and $3f) or $80);
Buf[2]:=char(byte((u shr 6) and $3f) or $80);
Buf[3]:=char(byte(u and $3f) or $80);
end;
else
RaiseInvalidUnicode;
end;
end;
function localUnicodeToUTF8(u: cardinal): shortstring;
begin
Result[0]:=chr(localUnicodeToUTF8(u,@Result[1]));
end;
function localUnicodeToUTF16(u: cardinal): widestring;
begin
// u should be <= $10FFFF to fit into UTF-16
if u < $10000 then
// Note: codepoints $D800 - $DFFF are reserved
Result:=widechar(u)
else
Result:=widechar($D800+((u - $10000) shr 10))+widechar($DC00+((u - $10000) and $3ff));
end;
function UnicodeToCESU8(u: cardinal; Buf: PChar): integer;
procedure RaiseInvalidUnicode;
begin
raise Exception.Create('UnicodeToCESU8: invalid unicode: '+IntToStr(u));
end;
var
st: widestring;
begin
case u of
0..$ffff:
begin
Result:=localUnicodeToUTF8(u,Buf);
end;
$10000..$10ffff:
begin
st := localUnicodeToUTF16(u);
Result:=6;
Buf[0]:=char(byte($e0 or (ord(st[1]) shr 12)));
Buf[1]:=char(byte((ord(st[1]) shr 6) and $3f) or $80);
Buf[2]:=char(byte(ord(st[1]) and $3f) or $80);
Buf[3]:=char(byte($e0 or (ord(st[2]) shr 12)));
Buf[4]:=char(byte((ord(st[2]) shr 6) and $3f) or $80);
Buf[5]:=char(byte(ord(st[2]) and $3f) or $80);
end;
else
RaiseInvalidUnicode;
end;
end;
function UnicodeToCESU8(u: cardinal): utf8string;
begin
setlength(result,1000);
setlength(result,UnicodeToCESU8(u,@Result[1]));
end;
procedure dotest;
var
s1,s2: utf8string;
w1,w2: unicodestring;
s3,s4: utf8string;
i: longint;
begin
s1 := localUnicodeToUTF8 ($10300);
s2 := UnicodeToCESU8 ($10300);
setlength(w1,20);
setlength(w2,20);
// -1 because UTF8ToUnicode returns a null-terminated string
setlength(w1,UTF8ToUnicode(punicodechar(@w1[1]),length(w1),pchar(s1),Length(s1))-1);
setlength(w2,UTF8ToUnicode(punicodechar(@w2[1]),length(w2),pchar(s2),Length(s2))-1);
(*
writeln('len: ',length(w1),' - "',w1,'"');
write(' ');
for i:= 1 to length(w1) do
write('#$',hexstr(ord(w1[i]),4));
writeln;
writeln('len: ',length(w2),' - "',w2,'"');
write(' ');
for i:= 1 to length(w2) do
write('#$',hexstr(ord(w2[i]),4));
writeln;
writeln;
*)
setlength(s3,20);
setlength(s4,20);
// -1 because UnicodeToUTF8 returns a null-terminated string
setlength(s3,UnicodeToUTF8(@s3[1],length(s3),punicodechar(@w1[1]),length(w1))-1);
setlength(s4,UnicodeToUTF8(@s4[1],length(s4),punicodechar(@w2[1]),length(w2))-1);
if (s3<>s1) or
{ invalid: CESU-8 }
(w2<>'??') or
(s4<>'??') then
begin
writeln('len: ',length(s1),' - "',s1,'"');
write(' ');
for i:= 1 to length(s1) do
write('#$',hexstr(ord(s1[i]),2));
writeln;
writeln('len: ',length(s2),' - "',s2,'"');
write(' ');
for i:= 1 to length(s2) do
write('#$',hexstr(ord(s2[i]),2));
writeln;
writeln('len: ',length(s3),' - "',s3,'"');
write(' ');
for i:= 1 to length(s3) do
write('#$',hexstr(ord(s3[i]),2));
writeln;
writeln('len: ',length(s4),' - "',s4,'"');
write(' ');
for i:= 1 to length(s4) do
write('#$',hexstr(ord(s4[i]),2));
writeln;
halt(1);
end;
end;
begin
dotest;
end.
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