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fatalerrors
2023-10-06 15:59:41 +02:00
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{==============================================================================|
| Project : Ararat Synapse | 001.001.001 |
|==============================================================================|
| Content: ICONV support for Win32, Linux and .NET |
|==============================================================================|
| Copyright (c)2004-2010, Lukas Gebauer |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| Redistributions of source code must retain the above copyright notice, this |
| list of conditions and the following disclaimer. |
| |
| Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions and the following disclaimer in the documentation |
| and/or other materials provided with the distribution. |
| |
| Neither the name of Lukas Gebauer nor the names of its contributors may |
| be used to endorse or promote products derived from this software without |
| specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR |
| ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| DAMAGE. |
|==============================================================================|
| The Initial Developer of the Original Code is Lukas Gebauer (Czech Republic).|
| Portions created by Lukas Gebauer are Copyright (c)2004-2010. |
| All Rights Reserved. |
|==============================================================================|
| Contributor(s): |
|==============================================================================|
| History: see HISTORY.HTM from distribution package |
| (Found at URL: http://www.ararat.cz/synapse/) |
|==============================================================================}
{$IFDEF FPC}
{$MODE DELPHI}
{$ENDIF}
{$H+}
//old Delphi does not have MSWINDOWS define.
{$IFDEF WIN32}
{$IFNDEF MSWINDOWS}
{$DEFINE MSWINDOWS}
{$ENDIF}
{$ENDIF}
{:@abstract(LibIconv support)
This unit is Pascal interface to LibIconv library for charset translations.
LibIconv is loaded dynamicly on-demand. If this library is not found in system,
requested LibIconv function just return errorcode.
}
unit synaicnv;
interface
uses
{$IFDEF CIL}
System.Runtime.InteropServices,
System.Text,
{$ENDIF}
synafpc,
{$IFNDEF MSWINDOWS}
{$IFNDEF FPC}
Libc,
{$ENDIF}
SysUtils;
{$ELSE}
Windows;
{$ENDIF}
const
{$IFNDEF MSWINDOWS}
DLLIconvName = 'libiconv.so';
{$ELSE}
DLLIconvName = 'iconv.dll';
{$ENDIF}
type
size_t = Cardinal;
{$IFDEF CIL}
iconv_t = IntPtr;
{$ELSE}
iconv_t = Pointer;
{$ENDIF}
argptr = iconv_t;
var
iconvLibHandle: TLibHandle = 0;
function SynaIconvOpen(const tocode, fromcode: Ansistring): iconv_t;
function SynaIconvOpenTranslit(const tocode, fromcode: Ansistring): iconv_t;
function SynaIconvOpenIgnore(const tocode, fromcode: Ansistring): iconv_t;
function SynaIconv(cd: iconv_t; inbuf: AnsiString; var outbuf: AnsiString): integer;
function SynaIconvClose(var cd: iconv_t): integer;
function SynaIconvCtl(cd: iconv_t; request: integer; argument: argptr): integer;
function IsIconvloaded: Boolean;
function InitIconvInterface: Boolean;
function DestroyIconvInterface: Boolean;
const
ICONV_TRIVIALP = 0; // int *argument
ICONV_GET_TRANSLITERATE = 1; // int *argument
ICONV_SET_TRANSLITERATE = 2; // const int *argument
ICONV_GET_DISCARD_ILSEQ = 3; // int *argument
ICONV_SET_DISCARD_ILSEQ = 4; // const int *argument
implementation
uses SyncObjs;
{$IFDEF CIL}
[DllImport(DLLIconvName, CharSet = CharSet.Ansi,
SetLastError = False, CallingConvention= CallingConvention.cdecl,
EntryPoint = 'libiconv_open')]
function _iconv_open(tocode: string; fromcode: string): iconv_t; external;
[DllImport(DLLIconvName, CharSet = CharSet.Ansi,
SetLastError = False, CallingConvention= CallingConvention.cdecl,
EntryPoint = 'libiconv')]
function _iconv(cd: iconv_t; var inbuf: IntPtr; var inbytesleft: size_t;
var outbuf: IntPtr; var outbytesleft: size_t): size_t; external;
[DllImport(DLLIconvName, CharSet = CharSet.Ansi,
SetLastError = False, CallingConvention= CallingConvention.cdecl,
EntryPoint = 'libiconv_close')]
function _iconv_close(cd: iconv_t): integer; external;
[DllImport(DLLIconvName, CharSet = CharSet.Ansi,
SetLastError = False, CallingConvention= CallingConvention.cdecl,
EntryPoint = 'libiconvctl')]
function _iconvctl(cd: iconv_t; request: integer; argument: argptr): integer; external;
{$ELSE}
type
Ticonv_open = function(tocode: pAnsichar; fromcode: pAnsichar): iconv_t; cdecl;
Ticonv = function(cd: iconv_t; var inbuf: pointer; var inbytesleft: size_t;
var outbuf: pointer; var outbytesleft: size_t): size_t; cdecl;
Ticonv_close = function(cd: iconv_t): integer; cdecl;
Ticonvctl = function(cd: iconv_t; request: integer; argument: argptr): integer; cdecl;
var
_iconv_open: Ticonv_open = nil;
_iconv: Ticonv = nil;
_iconv_close: Ticonv_close = nil;
_iconvctl: Ticonvctl = nil;
{$ENDIF}
var
IconvCS: TCriticalSection;
Iconvloaded: boolean = false;
function SynaIconvOpen (const tocode, fromcode: Ansistring): iconv_t;
begin
{$IFDEF CIL}
try
Result := _iconv_open(tocode, fromcode);
except
on Exception do
Result := iconv_t(-1);
end;
{$ELSE}
if InitIconvInterface and Assigned(_iconv_open) then
Result := _iconv_open(PAnsiChar(tocode), PAnsiChar(fromcode))
else
Result := iconv_t(-1);
{$ENDIF}
end;
function SynaIconvOpenTranslit (const tocode, fromcode: Ansistring): iconv_t;
begin
Result := SynaIconvOpen(tocode + '//IGNORE//TRANSLIT', fromcode);
end;
function SynaIconvOpenIgnore (const tocode, fromcode: Ansistring): iconv_t;
begin
Result := SynaIconvOpen(tocode + '//IGNORE', fromcode);
end;
function SynaIconv (cd: iconv_t; inbuf: AnsiString; var outbuf: AnsiString): integer;
var
{$IFDEF CIL}
ib, ob: IntPtr;
ibsave, obsave: IntPtr;
l: integer;
{$ELSE}
ib, ob: Pointer;
{$ENDIF}
ix, ox: size_t;
begin
{$IFDEF CIL}
l := Length(inbuf) * 4;
ibsave := IntPtr.Zero;
obsave := IntPtr.Zero;
try
ibsave := Marshal.StringToHGlobalAnsi(inbuf);
obsave := Marshal.AllocHGlobal(l);
ib := ibsave;
ob := obsave;
ix := Length(inbuf);
ox := l;
_iconv(cd, ib, ix, ob, ox);
Outbuf := Marshal.PtrToStringAnsi(obsave, l);
setlength(Outbuf, l - ox);
Result := Length(inbuf) - ix;
finally
Marshal.FreeCoTaskMem(ibsave);
Marshal.FreeHGlobal(obsave);
end;
{$ELSE}
if InitIconvInterface and Assigned(_iconv) then
begin
setlength(Outbuf, Length(inbuf) * 4);
ib := Pointer(inbuf);
ob := Pointer(Outbuf);
ix := Length(inbuf);
ox := Length(Outbuf);
_iconv(cd, ib, ix, ob, ox);
setlength(Outbuf, cardinal(Length(Outbuf)) - ox);
Result := Cardinal(Length(inbuf)) - ix;
end
else
begin
Outbuf := '';
Result := 0;
end;
{$ENDIF}
end;
function SynaIconvClose(var cd: iconv_t): integer;
begin
if cd = iconv_t(-1) then
begin
Result := 0;
Exit;
end;
{$IFDEF CIL}
try;
Result := _iconv_close(cd)
except
on Exception do
Result := -1;
end;
cd := iconv_t(-1);
{$ELSE}
if InitIconvInterface and Assigned(_iconv_close) then
Result := _iconv_close(cd)
else
Result := -1;
cd := iconv_t(-1);
{$ENDIF}
end;
function SynaIconvCtl (cd: iconv_t; request: integer; argument: argptr): integer;
begin
{$IFDEF CIL}
Result := _iconvctl(cd, request, argument)
{$ELSE}
if InitIconvInterface and Assigned(_iconvctl) then
Result := _iconvctl(cd, request, argument)
else
Result := 0;
{$ENDIF}
end;
function InitIconvInterface: Boolean;
begin
IconvCS.Enter;
try
if not IsIconvloaded then
begin
{$IFDEF CIL}
IconvLibHandle := 1;
{$ELSE}
IconvLibHandle := LoadLibrary(PChar(DLLIconvName));
{$ENDIF}
if (IconvLibHandle <> 0) then
begin
{$IFNDEF CIL}
_iconv_open := GetProcAddress(IconvLibHandle, PAnsiChar(AnsiString('libiconv_open')));
_iconv := GetProcAddress(IconvLibHandle, PAnsiChar(AnsiString('libiconv')));
_iconv_close := GetProcAddress(IconvLibHandle, PAnsiChar(AnsiString('libiconv_close')));
_iconvctl := GetProcAddress(IconvLibHandle, PAnsiChar(AnsiString('libiconvctl')));
{$ENDIF}
Result := True;
Iconvloaded := True;
end
else
begin
//load failed!
if IconvLibHandle <> 0 then
begin
{$IFNDEF CIL}
FreeLibrary(IconvLibHandle);
{$ENDIF}
IconvLibHandle := 0;
end;
Result := False;
end;
end
else
//loaded before...
Result := true;
finally
IconvCS.Leave;
end;
end;
function DestroyIconvInterface: Boolean;
begin
IconvCS.Enter;
try
Iconvloaded := false;
if IconvLibHandle <> 0 then
begin
{$IFNDEF CIL}
FreeLibrary(IconvLibHandle);
{$ENDIF}
IconvLibHandle := 0;
end;
{$IFNDEF CIL}
_iconv_open := nil;
_iconv := nil;
_iconv_close := nil;
_iconvctl := nil;
{$ENDIF}
finally
IconvCS.Leave;
end;
Result := True;
end;
function IsIconvloaded: Boolean;
begin
Result := IconvLoaded;
end;
initialization
begin
IconvCS:= TCriticalSection.Create;
end;
finalization
begin
{$IFNDEF CIL}
DestroyIconvInterface;
{$ENDIF}
IconvCS.Free;
end;
end.