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{* UltraStar Deluxe - Karaoke Game
*
* UltraStar Deluxe is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* $URL: https://ultrastardx.svn.sourceforge.net/svnroot/ultrastardx/trunk/src/menu/UMenuText.pas $
* $Id: UMenuText.pas 1485 2008-10-28 20:16:05Z tobigun $
*}
unit UTextEncoding;
interface
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{$I switches.inc}
uses
SysUtils,
StrUtils;
type
TEncoding = (
encCP1250, // Windows-1250 Central/Eastern Europe (used by Ultrastar)
encCP1252, // Windows-1252 Western Europe (used by UltraStar Deluxe < 1.1)
encUTF8, // UTF-8
encLocale // current locale (needs cwstring on linux)
);
const
EncodingNames: array[TEncoding] of AnsiString = (
'CP1250',
'CP1252',
'UTF8',
'LOCALE'
);
const
UTF8_BOM: AnsiString = #$EF#$BB#$BF;
{**
* Changes encoding of string Src with encoding SrcEncoding to UTF-16
* If SrcEncoding is encUnknown the result is undefined.
*}
function RecodeStringWide(const Src: string; SrcEncoding: TEncoding): WideString;
{**
* Changes encoding of string Src with encoding SrcEncoding to UTF-8.
* If SrcEncoding is encUnknown the result is undefined.
*}
function RecodeStringUTF8(const Src: string; SrcEncoding: TEncoding): UTF8String;
{**
* If Text starts with an UTF-8 BOM, the BOM is removed and true will
* be returned.
*}
function CheckReplaceUTF8BOM(var Text: string): boolean;
{**
* Parses an encoding string to its TEncoding equivalent.
* Surrounding whitespace and dashes ('-') are removed, the upper-cased
* resulting value is then compared with TEncodingNames.
* If the encoding was not found, the result is set to the Default encoding.
*}
function ParseEncoding(const EncodingStr: AnsiString; Default: TEncoding): TEncoding;
implementation
type
TConversionTable = array[0..127] of WideChar;
const
// Windows-1250 Central/Eastern Europe (used by Ultrastar)
CP1250Table: TConversionTable = (
{ $80 }
#$20AC, #0, #$201A, #0, #$201E, #$2026, #$2020, #$2021,
#0, #$2030, #$0160, #$2039, #$015A, #$0164, #$017D, #$0179,
{ $90 }
#0, #$2018, #$2019, #$201C, #$201D, #$2022, #$2013, #$2014,
#0, #$2122, #$0161, #$203A, #$015B, #$0165, #$017E, #$017A,
{ $A0 }
#$00A0, #$02C7, #$02D8, #$0141, #$00A4, #$0104, #$00A6, #$00A7,
#$00A8, #$00A9, #$015E, #$00AB, #$00AC, #$00AD, #$00AE, #$017B,
{ $B0 }
#$00B0, #$00B1, #$02DB, #$0142, #$00B4, #$00B5, #$00B6, #$00B7,
#$00B8, #$0105, #$015F, #$00BB, #$013D, #$02DD, #$013E, #$017C,
{ $C0 }
#$0154, #$00C1, #$00C2, #$0102, #$00C4, #$0139, #$0106, #$00C7,
#$010C, #$00C9, #$0118, #$00CB, #$011A, #$00CD, #$00CE, #$010E,
{ $D0 }
#$0110, #$0143, #$0147, #$00D3, #$00D4, #$0150, #$00D6, #$00D7,
#$0158, #$016E, #$00DA, #$0170, #$00DC, #$00DD, #$0162, #$00DF,
{ $E0 }
#$0155, #$00E1, #$00E2, #$0103, #$00E4, #$013A, #$0107, #$00E7,
#$010D, #$00E9, #$0119, #$00EB, #$011B, #$00ED, #$00EE, #$010F,
{ $F0 }
#$0111, #$0144, #$0148, #$00F3, #$00F4, #$0151, #$00F6, #$00F7,
#$0159, #$016F, #$00FA, #$0171, #$00FC, #$00FD, #$0163, #$02D9
);
// Windows-1252 Western Europe (used by UltraStar Deluxe < 1.1)
CP1252Table: TConversionTable = (
{ $80 }
#$20AC, #0, #$201A, #$0192, #$201E, #$2026, #$2020, #$2021,
#$02C6, #$2030, #$0160, #$2039, #$0152, #0, #$017D, #0,
{ $90 }
#0, #$2018, #$2019, #$201C, #$201D, #$2022, #$2013, #$2014,
#$02DC, #$2122, #$0161, #$203A, #$0153, #0, #$017E, #$0178,
{ $A0 }
#$00A0, #$00A1, #$00A2, #$00A3, #$00A4, #$00A5, #$00A6, #$00A7,
#$00A8, #$00A9, #$00AA, #$00AB, #$00AC, #$00AD, #$00AE, #$00AF,
{ $B0 }
#$00B0, #$00B1, #$00B2, #$00B3, #$00B4, #$00B5, #$00B6, #$00B7,
#$00B8, #$00B9, #$00BA, #$00BB, #$00BC, #$00BD, #$00BE, #$00BF,
{ $C0 }
#$00C0, #$00C1, #$00C2, #$00C3, #$00C4, #$00C5, #$00C6, #$00C7,
#$00C8, #$00C9, #$00CA, #$00CB, #$00CC, #$00CD, #$00CE, #$00CF,
{ $D0 }
#$00D0, #$00D1, #$00D2, #$00D3, #$00D4, #$00D5, #$00D6, #$00D7,
#$00D8, #$00D9, #$00DA, #$00DB, #$00DC, #$00DD, #$00DE, #$00DF,
{ $E0 }
#$00E0, #$00E1, #$00E2, #$00E3, #$00E4, #$00E5, #$00E6, #$00E7,
#$00E8, #$00E9, #$00EA, #$00EB, #$00EC, #$00ED, #$00EE, #$00EF,
{ $F0 }
#$00F0, #$00F1, #$00F2, #$00F3, #$00F4, #$00F5, #$00F6, #$00F7,
#$00F8, #$00F9, #$00FA, #$00FB, #$00FC, #$00FD, #$00FE, #$00FF
);
{**
* Internal conversion function
*}
function Convert(const Src: string; const Table: TConversionTable): WideString;
var
SrcPos, DstPos: integer;
begin
SetLength(Result, Length(Src));
DstPos := 1;
for SrcPos := 1 to Length(Src) do
begin
if (Src[SrcPos] < #128) then
begin
// copy ASCII char
// Important: the Ord() is necessary to prevent FPC from an automatic
// encoding conversion (using the local codepage). Delphi does not perform
// such a conversion.
Result[DstPos] := WideChar(Ord(Src[SrcPos]));
Inc(DstPos);
end
else
begin
// look-up char
Result[DstPos] := Table[Ord(Src[SrcPos]) - 128];
// ignore invalid characters
if (Result[DstPos] <> #0) then
Inc(DstPos);
end;
end;
SetLength(Result, DstPos-1);
end;
function RecodeStringWide(const Src: string; SrcEncoding: TEncoding): WideString;
begin
case SrcEncoding of
encCP1250:
Result := Convert(Src, CP1250Table);
encCP1252:
Result := Convert(Src, CP1252Table);
encUTF8:
Result := UTF8Decode(Src);
encLocale:
Result := UTF8Decode(AnsiToUtf8(Src));
else
Result := '';
end;
end;
function RecodeStringUTF8(const Src: string; SrcEncoding: TEncoding): UTF8String;
begin
case SrcEncoding of
encCP1250:
Result := UTF8Encode(Convert(Src, CP1250Table));
encCP1252:
Result := UTF8Encode(Convert(Src, CP1252Table));
encUTF8:
Result := Src;
encLocale:
Result := AnsiToUtf8(Src);
else
Result := '';
end;
end;
function CheckReplaceUTF8BOM(var Text: string): boolean;
begin
if AnsiStartsStr(UTF8_BOM, Text) then
begin
Text := Copy(Text, Length(UTF8_BOM)+1, Length(Text)-Length(UTF8_BOM));
Result := true;
Exit;
end;
Result := false;
end;
function ParseEncoding(const EncodingStr: AnsiString; Default: TEncoding): TEncoding;
var
PrepStr: string; // prepared encoding string
Encoding: TEncoding;
begin
// remove surrounding whitespace, replace dashes, to upper case
PrepStr := UpperCase(AnsiReplaceStr(Trim(EncodingStr), '-', ''));
for Encoding := Low(EncodingNames) to High(EncodingNames) do
begin
if (EncodingNames[Encoding] = PrepStr) then
begin
Result := Encoding;
Exit;
end;
end;
Result := Default;
end;
end.
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