udr/client/FBClientAPI.pas

(*
 *  Firebird Interface (fbintf). The fbintf components provide a set of
 *  Pascal language bindings for the Firebird API. Although predominantly
 *  a new development they include source code taken from IBX and may be
 *  considered a derived product. This software thus also includes the copyright
 *  notice and license conditions from IBX.
 *
 *  Except for those parts dervied from IBX, contents of this file are subject
 *  to the Initial Developer's Public License Version 1.0 (the "License"); you
 *  may not use this file except in compliance with the License. You may obtain a
 *  copy of the License here:
 *
 *    http://www.firebirdsql.org/index.php?op=doc&id=idpl
 *
 *  Software distributed under the License is distributed on an "AS
 *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 *  implied. See the License for the specific language governing rights
 *  and limitations under the License.
 *
 *  The Initial Developer of the Original Code is Tony Whyman.
 *
 *  The Original Code is (C) 2016 Tony Whyman, MWA Software
 *  (http://www.mwasoftware.co.uk).
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): ______________________________________.
 *
*)
{************************************************************************}
{                                                                        }
{       Borland Delphi Visual Component Library                          }
{       InterBase Express core components                                }
{                                                                        }
{       Copyright (c) 1998-2000 Inprise Corporation                      }
{                                                                        }
{    InterBase Express is based in part on the product                   }
{    Free IB Components, written by Gregory H. Deatz for                 }
{    Hoagland, Longo, Moran, Dunst & Doukas Company.                     }
{    Free IB Components is used under license.                           }
{                                                                        }
{    The contents of this file are subject to the InterBase              }
{    Public License Version 1.0 (the "License"); you may not             }
{    use this file except in compliance with the License. You            }
{    may obtain a copy of the License at http://www.Inprise.com/IPL.html }
{    Software distributed under the License is distributed on            }
{    an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either              }
{    express or implied. See the License for the specific language       }
{    governing rights and limitations under the License.                 }
{    The Original Code was created by InterBase Software Corporation     }
{       and its successors.                                              }
{    Portions created by Inprise Corporation are Copyright (C) Inprise   }
{       Corporation. All Rights Reserved.                                }
{    Contributor(s): Jeff Overcash                                       }
{                                                                        }
{    IBX For Lazarus (Firebird Express)                                  }
{    Contributor: Tony Whyman, MWA Software http://www.mwasoftware.co.uk }
{    Portions created by MWA Software are copyright McCallum Whyman      }
{    Associates Ltd 2011 - 2015                                                }
{                                                                        }
{************************************************************************}
unit FBClientAPI;
{$IFDEF MSWINDOWS} 
{$DEFINE WINDOWS} 
{$ENDIF}

{$IFDEF FPC}
{$mode delphi}
{$codepage UTF8}
{$interfaces COM}
{$ENDIF}

interface

uses
  Classes,
    {$IFDEF WINDOWS}Windows, {$ENDIF}
    {$IFDEF FPC} Dynlibs, {$ENDIF}
   IB, IBHeader, FBActivityMonitor, FBMessages, IBExternals, FmtBCD;

{For Linux see result of GetFirebirdLibList method}
{$IFDEF DARWIN}
const
FIREBIRD_SO2 = 'libfbclient.dylib';
{$ENDIF}
{$IFDEF WINDOWS}
const
IBASE_DLL = 'gds32.dll';
FIREBIRD_CLIENT = 'fbclient.dll'; {do not localize}
FIREBIRD_EMBEDDED = 'fbembed.dll';
{$ENDIF}

const
  {fb_shutdown reasons}
  fb_shutrsn_svc_stopped          = -1;
  fb_shutrsn_no_connection        = -2;
  fb_shutrsn_app_stopped          = -3;
  fb_shutrsn_signal               = -5;
  fb_shutrsn_services             = -6;
  fb_shutrsn_exit_called          = -7;

const
    DefaultTimeZoneFile = '/etc/timezone';

const
  IBLocalBufferLength = 512;
  IBBigLocalBufferLength = IBLocalBufferLength * 2;
  IBHugeLocalBufferLength = IBBigLocalBufferLength * 20;

type
  TStatusVector              = array[0..19] of NativeInt;
  PStatusVector              = ^TStatusVector;

  TFBClientAPI = class;

  { TFBStatus }

  TFBStatus = class(TFBInterfacedObject)
  private
    FIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
  protected
    FOwner: TFBClientAPI;
  public
    constructor Create(aOwner: TFBClientAPI);
    function StatusVector: PStatusVector; virtual; abstract;

    {IStatus}
    function GetIBErrorCode: Long;
    function Getsqlcode: Long;
    function GetMessage: AnsiString;
    function CheckStatusVector(ErrorCodes: array of TFBStatusCode): Boolean;
    function GetIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
    procedure SetIBDataBaseErrorMessages(Value: TIBDataBaseErrorMessages);
  end;

  { TFBLibrary }

  TFBLibrary = class(TFBInterfacedObject,IFirebirdLibrary)
  private
    class var FEnvSetupDone: boolean;
    class var FLibraryList: array of IFirebirdLibrary;
  private
    FFirebirdAPI: IFirebirdAPI;
    FRequestedLibName: string;
    function LoadIBLibrary: boolean;
  protected
    FFBLibraryName: string;
    FIBLibrary: TLibHandle;
    procedure FreeFBLibrary;
    function GetOverrideLibName: string;
    class procedure SetupEnvironment;
  protected
    function GetFirebird3API: IFirebirdAPI; virtual; abstract;
    function GetLegacyFirebirdAPI: IFirebirdAPI; virtual; abstract;
  public
    constructor Create(aLibPathName: string='');
    destructor Destroy; override;
    class function GetFBLibrary(aLibPathName: string): IFirebirdLibrary;
    class procedure FreeLibraries;
    function SameLibrary(aLibName: string): boolean;

  public
    {IFirebirdLibrary}
    function GetHandle: TLibHandle;
    function GetLibraryName: string;
    function GetLibraryFilePath: string;
    function GetFirebirdAPI: IFirebirdAPI;
    property IBLibrary: TLibHandle read FIBLibrary;
  end;

  { TFBClientAPI }

  TFBClientAPI = class(TFBInterfacedObject)
  private
    FLocalTimeZoneName: AnsiString; {Informal Time Zone Name from tzname e.g. GMT or BST}
    FTZDataTimeZoneID: AnsiString; {TZData DB ID e.g. Europe/London}
    FLocalTimeOffset: integer;
    FIsDaylightSavingsTime: boolean;
    class var FIBCS: TRTLCriticalSection;
    function FBTimeStampToDateTime(aDate, aTime: longint): TDateTime;
    procedure GetTZDataSettings;
  protected
    FFBLibrary: TFBLibrary;
    function GetProcAddr(ProcName: PAnsiChar): Pointer;

  protected type
    Tfb_shutdown = function (timeout: uint;
                                 const reason: int): int;
                   {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  protected
    {FB Shutdown API}
    fb_shutdown: Tfb_shutdown;

  public
    {Taken from legacy API}
    isc_sqlcode: Tisc_sqlcode;
    isc_sql_interprete: Tisc_sql_interprete;
    isc_event_counts: Tisc_event_counts;
    isc_event_block: Tisc_event_block;
    isc_free: Tisc_free;

    constructor Create(aFBLibrary: TFBLibrary);
    procedure IBAlloc(var P; OldSize, NewSize: Integer);
    procedure IBDataBaseError;
    function LoadInterface: boolean; virtual;
    procedure FBShutdown; virtual;
    function GetAPI: IFirebirdAPI; virtual; abstract;
    {$IFDEF UNIX}
    function GetFirebirdLibList: string; virtual; abstract;
    {$ENDIF}
    function HasDecFloatSupport: boolean;
    function HasInt128Support: boolean; virtual;
    function HasLocalTZDB: boolean; virtual;
    function HasExtendedTZSupport: boolean; virtual;
    function HasTimeZoneSupport: boolean; virtual;

  public
    property LocalTimeZoneName: AnsiString read FLocalTimeZoneName;
    property TZDataTimeZoneID: AnsiString read FTZDataTimeZoneID;
    property LocalTimeOffset: integer read FLocalTimeOffset;
  public
    {Encode/Decode}
    procedure EncodeInteger(aValue: integer; len: integer; buffer: PByte);
    function DecodeInteger(bufptr: PByte; len: short): integer; virtual; abstract;
    procedure SQLEncodeDate(aDate: TDateTime; bufptr: PByte);  virtual; abstract;
    function SQLDecodeDate(byfptr: PByte): TDateTime;  virtual; abstract;
    procedure SQLEncodeTime(aTime: TDateTime; bufptr: PByte);  virtual; abstract;
    function SQLDecodeTime(bufptr: PByte): TDateTime;  virtual; abstract;
    procedure SQLEncodeDateTime(aDateTime: TDateTime; bufptr: PByte); virtual; abstract;
    function  SQLDecodeDateTime(bufptr: PByte): TDateTime; virtual; abstract;
    function FormatStatus(Status: TFBStatus): AnsiString; virtual; abstract;
    function Int128ToStr(bufptr: PByte; scale: integer): AnsiString; virtual;
    procedure StrToInt128(scale: integer; aValue: AnsiString; bufptr: PByte);
      virtual;
    procedure SQLDecFloatEncode(aValue: tBCD; SQLType: cardinal; bufptr: PByte); virtual;
    function SQLDecFloatDecode(SQLType: cardinal;  bufptr: PByte): tBCD; virtual;

    {IFirebirdAPI}
    function GetStatus: IStatus; virtual; abstract;
    function IsLibraryLoaded: boolean;
    function IsEmbeddedServer: boolean; virtual; abstract;
    function GetFBLibrary: IFirebirdLibrary;
    function GetImplementationVersion: AnsiString;
    function GetClientMajor: integer;  virtual; abstract;
    function GetClientMinor: integer;  virtual; abstract;
end;

implementation

uses IBUtils, Registry,
  {$IFDEF Unix} unix, initc, dl, {$ENDIF}
{$IFDEF FPC}
{$IFDEF WINDOWS }
WinDirs,
{$ENDIF}
{$ELSE}
 ShlObj,
{$ENDIF}
SysUtils;

{$IFDEF UNIX}
{$I 'include/uloadlibrary.inc'}
{$ELSE}
{$I 'include/wloadlibrary.inc'}
{$ENDIF}


{ TFBLibrary }

function TFBLibrary.GetOverrideLibName: string;
begin
  Result := FFBLibraryName;
  if (Result = '') and AllowUseOfFBLIB then
    Result := GetEnvironmentVariable('FBLIB');
  if Result = '' then
  begin
    if assigned(OnGetLibraryName) then
      OnGetLibraryName(Result)
  end;
end;

procedure TFBLibrary.FreeFBLibrary;
begin
  (FFirebirdAPI as TFBClientAPI).FBShutdown;
  if FIBLibrary <> NilHandle then
    FreeLibrary(FIBLibrary);
  FIBLibrary := NilHandle;
  FFBLibraryName := '';
end;

function TFBLibrary.GetLibraryName: string;
begin
  Result := ExtractFileName(FFBLibraryName);
end;

function TFBLibrary.GetFirebirdAPI: IFirebirdAPI;
begin
  Result := FFirebirdAPI;
end;

constructor TFBLibrary.Create(aLibPathName: string);
begin
  inherited Create;
  SetupEnvironment;
  FFBLibraryName := aLibPathName;
  FIBLibrary := NilHandle;
  FFirebirdAPI := GetFirebird3API;
  FRequestedLibName := aLibPathName;
  if aLibPathName <> '' then
  begin
    SetLength(FLibraryList,Length(FLibraryList)+1);
    FLibraryList[Length(FLibraryList)-1] := self;
  end;
  if FFirebirdAPI <> nil then
  begin
    {First try Firebird 3}
    if not LoadIBLibrary or not (FFirebirdAPI as TFBClientAPI).LoadInterface then
      FFirebirdAPI := nil;
  end;

  if FFirebirdAPI = nil then
  begin
    {now try Firebird 2.5. Under Unix we need to reload the library in case we
     are to use the embedded library}
    FFirebirdAPI := GetLegacyFirebirdAPI;
    if FFirebirdAPI <> nil then
    begin
      {$IFDEF UNIX}
      FreeFBLibrary;
      {$ENDIF}
      if not LoadIBLibrary or not (FFirebirdAPI as TFBClientAPI).LoadInterface then
        FFirebirdAPI := nil;
    end;
  end;
  {Note: FFirebirdAPI will be set to nil if the Firebird API fails to load}
end;

destructor TFBLibrary.Destroy;
begin
  FreeFBLibrary;
  FFirebirdAPI := nil;
  inherited Destroy;
end;

class function TFBLibrary.GetFBLibrary(aLibPathName: string): IFirebirdLibrary;
var i: integer;
begin
  Result := nil;
  if aLibPathName <> '' then
  begin
    for i := 0 to Length(FLibraryList) - 1 do
    begin
      if (FLibraryList[i] as TFBLibrary).SameLibrary(aLibPathName) then
      begin
        Result := FLibraryList[i];
        Exit;
      end;
    end;
    Result := Create(aLibPathName);
  end;

end;

class procedure TFBLibrary.FreeLibraries;
var i: integer;
begin
  for i := 0 to Length(FLibraryList) - 1 do
    FLibraryList[i] := nil;
  SetLength(FLibraryList,0);
end;

function TFBLibrary.SameLibrary(aLibName: string): boolean;
begin
  Result := FRequestedLibName = aLibName;
end;

function TFBLibrary.GetHandle: TLibHandle;
begin
  Result := FIBLibrary;
end;

{ TFBClientAPI }

constructor TFBClientAPI.Create(aFBLibrary: TFBLibrary);
begin
  inherited Create;
  FFBLibrary := aFBLibrary;
  GetTZDataSettings;
end;

procedure TFBClientAPI.IBAlloc(var P; OldSize, NewSize: Integer);
var
  i: Integer;
begin
  ReallocMem(Pointer(P), NewSize);
  for i := OldSize to NewSize - 1 do PAnsiChar(P)[i] := #0;
end;

procedure TFBClientAPI.IBDataBaseError;
begin
  raise EIBInterBaseError.Create(GetStatus);
end;

procedure TFBClientAPI.EncodeInteger(aValue: integer; len: integer; buffer: PByte);
begin
  while len > 0 do
  begin
    buffer^ := aValue and $FF;
    Inc(buffer);
    Dec(len);
    aValue := aValue shr 8;
  end;
end;

function TFBClientAPI.Int128ToStr(bufptr: PByte; scale: integer): AnsiString;
begin
  if not HasInt128Support then
    IBError(ibxeNotSupported,[]);
end;

procedure TFBClientAPI.StrToInt128(scale: integer; aValue: AnsiString; bufptr: PByte);
begin
  if not HasInt128Support then
    IBError(ibxeNotSupported,[]);
end;

procedure TFBClientAPI.SQLDecFloatEncode(aValue: tBCD; SQLType: cardinal;
  bufptr: PByte);
begin
  if not HasDecFloatSupport then
    IBError(ibxeNotSupported,[]);
end;

function TFBClientAPI.SQLDecFloatDecode(SQLType: cardinal; bufptr: PByte): tBCD;
begin
  if not HasDecFloatSupport then
    IBError(ibxeNotSupported,[]);
end;

function TFBClientAPI.IsLibraryLoaded: boolean;
begin
  Result := FFBLibrary.IBLibrary <> NilHandle;
end;

function TFBClientAPI.GetFBLibrary: IFirebirdLibrary;
begin
  Result := FFBLibrary;
end;

function TFBClientAPI.FBTimeStampToDateTime(aDate, aTime: longint): TDateTime;
begin
  {aDate/aTime are in TTimestamp format but aTime is decimilliseconds}
  aDate := aDate - DateDelta;
  if aDate < 0 then
    Result := trunc(aDate) - abs(frac(aTime / (MSecsPerDay*10)))
  else
    Result := trunc(aDate) + abs(frac(aTime / (MSecsPerDay*10)));
end;

{$IFDEF UNIX}
procedure TFBClientAPI.GetTZDataSettings;
var S: TStringList;
begin
  FLocalTimeOffset := GetLocalTimeOffset;
  FLocalTimeZoneName := strpas(tzname[tzdaylight]);
  FIsDaylightSavingsTime := tzdaylight;
  if FileExists(DefaultTimeZoneFile) then
  begin
    S := TStringList.Create;
    try
      S.LoadFromFile(DefaultTimeZoneFile);
      if S.Count > 0 then
        FTZDataTimeZoneID := S[0];
    finally
      S.Free;
    end;
  end;
end;
{$ENDIF}

{$IFDEF WINDOWS}
procedure TFBClientAPI.GetTZDataSettings;
var TZInfo: TTimeZoneInformation;
begin
  FIsDaylightSavingsTime := false;
  {is there any way of working out the default TZData DB time zone ID under Windows?}
  case GetTimeZoneInformation(TZInfo) of
    TIME_ZONE_ID_UNKNOWN:
      begin
        FLocalTimeZoneName := '';
        FLocalTimeOffset := 0;
      end;
    TIME_ZONE_ID_STANDARD:
      begin
        FLocalTimeZoneName := strpas(PWideChar(@TZInfo.StandardName));
        FLocalTimeOffset := TZInfo.Bias;
      end;
    TIME_ZONE_ID_DAYLIGHT:
      begin
        FLocalTimeZoneName := strpas(PWideChar(@TZInfo.DaylightName));
        FLocalTimeOffset := TZInfo.DayLightBias;
        FIsDaylightSavingsTime := true;
      end;
  end;
end;
{$ENDIF}

function TFBClientAPI.GetProcAddr(ProcName: PAnsiChar): Pointer;
begin
  Result := GetProcAddress(FFBLibrary.IBLibrary, ProcName);
  if not Assigned(Result) then
    raise Exception.CreateFmt(SFirebirdAPIFuncNotFound,[ProcName]);
end;

function TFBClientAPI.HasDecFloatSupport: boolean;
begin
  Result := GetClientMajor >= 4;
end;

function TFBClientAPI.HasInt128Support: boolean;
begin
  Result := false;
end;

function TFBClientAPI.HasLocalTZDB: boolean;
begin
  Result := false;
end;

function TFBClientAPI.HasExtendedTZSupport: boolean;
begin
  Result := false;
end;

function TFBClientAPI.HasTimeZoneSupport: boolean;
begin
  Result := false;
end;

function TFBClientAPI.GetImplementationVersion: AnsiString;
begin
  Result := Format('%d.%d',[GetClientMajor,GetClientMinor]);
end;

function TFBClientAPI.LoadInterface: boolean;
begin
  isc_sqlcode := GetProcAddr('isc_sqlcode'); {do not localize}
  isc_sql_interprete := GetProcAddr('isc_sql_interprete'); {do not localize}
  isc_event_counts := GetProcAddr('isc_event_counts'); {do not localize}
  isc_event_block := GetProcAddr('isc_event_block'); {do not localize}
  isc_free := GetProcAddr('isc_free'); {do not localize}
  fb_shutdown := GetProcAddr('fb_shutdown'); {do not localize}
  Result := assigned(isc_free);
end;

procedure TFBClientAPI.FBShutdown;
begin
  if assigned(fb_shutdown) then
    fb_shutdown(0,fb_shutrsn_exit_called);
end;

{ TFBStatus }

constructor TFBStatus.Create(aOwner: TFBClientAPI);
begin
  inherited Create;
  FOwner := aOwner;
  FIBDataBaseErrorMessages := [ShowSQLMessage, ShowIBMessage];
end;

function TFBStatus.GetIBErrorCode: Long;
begin
  Result := StatusVector^[1];
end;

function TFBStatus.Getsqlcode: Long;
begin
  with FOwner do
    Result := isc_sqlcode(PISC_STATUS(StatusVector));
end;

function TFBStatus.GetMessage: AnsiString;
var local_buffer: array[0..IBHugeLocalBufferLength - 1] of AnsiChar;
    IBDataBaseErrorMessages: TIBDataBaseErrorMessages;
    sqlcode: Long;
begin
  Result := '';
  IBDataBaseErrorMessages := FIBDataBaseErrorMessages;
  sqlcode := Getsqlcode;
  if (ShowSQLCode in IBDataBaseErrorMessages) then
    Result := Result + 'SQLCODE: ' + IntToStr(sqlcode); {do not localize}

  Exclude(IBDataBaseErrorMessages, ShowSQLMessage);
  if (ShowSQLMessage in IBDataBaseErrorMessages) then
  begin
    with FOwner do
      isc_sql_interprete(sqlcode, local_buffer, sizeof(local_buffer));
    if (ShowSQLCode in FIBDataBaseErrorMessages) then
      Result := Result + CRLF;
    Result := Result + strpas(local_buffer);
  end;

  if (ShowIBMessage in IBDataBaseErrorMessages) then
  begin
    if (ShowSQLCode in IBDataBaseErrorMessages) or
       (ShowSQLMessage in IBDataBaseErrorMessages) then
      Result := Result + LineEnding;
    Result := Result + FOwner.FormatStatus(self);
  end;
  if (Result <> '') and (Result[Length(Result)] = '.') then
    Delete(Result, Length(Result), 1);
end;

function TFBStatus.CheckStatusVector(ErrorCodes: array of TFBStatusCode
  ): Boolean;
var
  p: PISC_STATUS;
  i: Integer;
  procedure NextP(i: Integer);
  begin
    p := PISC_STATUS(PAnsiChar(p) + (i * SizeOf(ISC_STATUS)));
  end;
begin
  p := PISC_STATUS(StatusVector);
  result := False;
  while (p^ <> 0) and (not result) do
    case p^ of
      3: NextP(3);
      1, 4:
      begin
        NextP(1);
        i := 0;
        while (i <= High(ErrorCodes)) and (not result) do
        begin
          result := p^ = ErrorCodes[i];
          Inc(i);
        end;
        NextP(1);
      end;
      else
        NextP(2);
    end;
end;

function TFBStatus.GetIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
begin
  EnterCriticalSection(TFBClientAPI.FIBCS);
  try
    result := FIBDataBaseErrorMessages;
  finally
    LeaveCriticalSection(TFBClientAPI.FIBCS);
  end;
end;

procedure TFBStatus.SetIBDataBaseErrorMessages(Value: TIBDataBaseErrorMessages);
begin
  EnterCriticalSection(TFBClientAPI.FIBCS);
  try
    FIBDataBaseErrorMessages := Value;
  finally
    LeaveCriticalSection(TFBClientAPI.FIBCS);
  end;
end;

initialization
  TFBLibrary.FEnvSetupDone := false;
  {$IFNDEF FPC}
  InitializeCriticalSection(TFBClientAPI.FIBCS);
  {$ELSE}
  InitCriticalSection(TFBClientAPI.FIBCS);
  {$ENDIF}

finalization
  TFBLibrary.FreeLibraries;
  {$IFNDEF FPC}
  DeleteCriticalSection(TFBClientAPI.FIBCS);
  {$ELSE}
  DoneCriticalSection(TFBClientAPI.FIBCS);
  {$ENDIF}
end.

Revision:	316
Committed:	Thu Feb 25 11:59:00 2021 UTC (3 years, 8 months ago) by tony
Content type:	text/x-pascal
Original Path:	*ibx/trunk/fbintf/client/FBClientAPI.pas*
File size:	20152 byte(s)
Log Message:	Merge Fixes
#	Content
1	(*
2	* Firebird Interface (fbintf). The fbintf components provide a set of
3	* Pascal language bindings for the Firebird API. Although predominantly
4	* a new development they include source code taken from IBX and may be
5	* considered a derived product. This software thus also includes the copyright
6	* notice and license conditions from IBX.
7	*
8	* Except for those parts dervied from IBX, contents of this file are subject
9	* to the Initial Developer's Public License Version 1.0 (the "License"); you
10	* may not use this file except in compliance with the License. You may obtain a
11	* copy of the License here:
12	*
13	* http://www.firebirdsql.org/index.php?op=doc&id=idpl
14	*
15	* Software distributed under the License is distributed on an "AS
16	* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
17	* implied. See the License for the specific language governing rights
18	* and limitations under the License.
19	*
20	* The Initial Developer of the Original Code is Tony Whyman.
21	*
22	* The Original Code is (C) 2016 Tony Whyman, MWA Software
23	* (http://www.mwasoftware.co.uk).
24	*
25	* All Rights Reserved.
26	*
27	* Contributor(s): ______________________________________.
28	*
29	*)
30	{************************************************************************}
31	{ }
32	{ Borland Delphi Visual Component Library }
33	{ InterBase Express core components }
34	{ }
35	{ Copyright (c) 1998-2000 Inprise Corporation }
36	{ }
37	{ InterBase Express is based in part on the product }
38	{ Free IB Components, written by Gregory H. Deatz for }
39	{ Hoagland, Longo, Moran, Dunst & Doukas Company. }
40	{ Free IB Components is used under license. }
41	{ }
42	{ The contents of this file are subject to the InterBase }
43	{ Public License Version 1.0 (the "License"); you may not }
44	{ use this file except in compliance with the License. You }
45	{ may obtain a copy of the License at http://www.Inprise.com/IPL.html }
46	{ Software distributed under the License is distributed on }
47	{ an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either }
48	{ express or implied. See the License for the specific language }
49	{ governing rights and limitations under the License. }
50	{ The Original Code was created by InterBase Software Corporation }
51	{ and its successors. }
52	{ Portions created by Inprise Corporation are Copyright (C) Inprise }
53	{ Corporation. All Rights Reserved. }
54	{ Contributor(s): Jeff Overcash }
55	{ }
56	{ IBX For Lazarus (Firebird Express) }
57	{ Contributor: Tony Whyman, MWA Software http://www.mwasoftware.co.uk }
58	{ Portions created by MWA Software are copyright McCallum Whyman }
59	{ Associates Ltd 2011 - 2015 }
60	{ }
61	{************************************************************************}
62	unit FBClientAPI;
63	{$IFDEF MSWINDOWS}
64	{$DEFINE WINDOWS}
65	{$ENDIF}
66
67	{$IFDEF FPC}
68	{$mode delphi}
69	{$codepage UTF8}
70	{$interfaces COM}
71	{$ENDIF}
72
73	interface
74
75	uses
76	Classes,
77	{$IFDEF WINDOWS}Windows, {$ENDIF}
78	{$IFDEF FPC} Dynlibs, {$ENDIF}
79	IB, IBHeader, FBActivityMonitor, FBMessages, IBExternals, FmtBCD;
80
81	{For Linux see result of GetFirebirdLibList method}
82	{$IFDEF DARWIN}
83	const
84	FIREBIRD_SO2 = 'libfbclient.dylib';
85	{$ENDIF}
86	{$IFDEF WINDOWS}
87	const
88	IBASE_DLL = 'gds32.dll';
89	FIREBIRD_CLIENT = 'fbclient.dll'; {do not localize}
90	FIREBIRD_EMBEDDED = 'fbembed.dll';
91	{$ENDIF}
92
93	const
94	{fb_shutdown reasons}
95	fb_shutrsn_svc_stopped = -1;
96	fb_shutrsn_no_connection = -2;
97	fb_shutrsn_app_stopped = -3;
98	fb_shutrsn_signal = -5;
99	fb_shutrsn_services = -6;
100	fb_shutrsn_exit_called = -7;
101
102	const
103	DefaultTimeZoneFile = '/etc/timezone';
104
105	const
106	IBLocalBufferLength = 512;
107	IBBigLocalBufferLength = IBLocalBufferLength * 2;
108	IBHugeLocalBufferLength = IBBigLocalBufferLength * 20;
109
110	type
111	TStatusVector = array[0..19] of NativeInt;
112	PStatusVector = ^TStatusVector;
113
114	TFBClientAPI = class;
115
116	{ TFBStatus }
117
118	TFBStatus = class(TFBInterfacedObject)
119	private
120	FIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
121	protected
122	FOwner: TFBClientAPI;
123	public
124	constructor Create(aOwner: TFBClientAPI);
125	function StatusVector: PStatusVector; virtual; abstract;
126
127	{IStatus}
128	function GetIBErrorCode: Long;
129	function Getsqlcode: Long;
130	function GetMessage: AnsiString;
131	function CheckStatusVector(ErrorCodes: array of TFBStatusCode): Boolean;
132	function GetIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
133	procedure SetIBDataBaseErrorMessages(Value: TIBDataBaseErrorMessages);
134	end;
135
136	{ TFBLibrary }
137
138	TFBLibrary = class(TFBInterfacedObject,IFirebirdLibrary)
139	private
140	class var FEnvSetupDone: boolean;
141	class var FLibraryList: array of IFirebirdLibrary;
142	private
143	FFirebirdAPI: IFirebirdAPI;
144	FRequestedLibName: string;
145	function LoadIBLibrary: boolean;
146	protected
147	FFBLibraryName: string;
148	FIBLibrary: TLibHandle;
149	procedure FreeFBLibrary;
150	function GetOverrideLibName: string;
151	class procedure SetupEnvironment;
152	protected
153	function GetFirebird3API: IFirebirdAPI; virtual; abstract;
154	function GetLegacyFirebirdAPI: IFirebirdAPI; virtual; abstract;
155	public
156	constructor Create(aLibPathName: string='');
157	destructor Destroy; override;
158	class function GetFBLibrary(aLibPathName: string): IFirebirdLibrary;
159	class procedure FreeLibraries;
160	function SameLibrary(aLibName: string): boolean;
161
162	public
163	{IFirebirdLibrary}
164	function GetHandle: TLibHandle;
165	function GetLibraryName: string;
166	function GetLibraryFilePath: string;
167	function GetFirebirdAPI: IFirebirdAPI;
168	property IBLibrary: TLibHandle read FIBLibrary;
169	end;
170
171	{ TFBClientAPI }
172
173	TFBClientAPI = class(TFBInterfacedObject)
174	private
175	FLocalTimeZoneName: AnsiString; {Informal Time Zone Name from tzname e.g. GMT or BST}
176	FTZDataTimeZoneID: AnsiString; {TZData DB ID e.g. Europe/London}
177	FLocalTimeOffset: integer;
178	FIsDaylightSavingsTime: boolean;
179	class var FIBCS: TRTLCriticalSection;
180	function FBTimeStampToDateTime(aDate, aTime: longint): TDateTime;
181	procedure GetTZDataSettings;
182	protected
183	FFBLibrary: TFBLibrary;
184	function GetProcAddr(ProcName: PAnsiChar): Pointer;
185
186	protected type
187	Tfb_shutdown = function (timeout: uint;
188	const reason: int): int;
189	{$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
190	protected
191	{FB Shutdown API}
192	fb_shutdown: Tfb_shutdown;
193
194	public
195	{Taken from legacy API}
196	isc_sqlcode: Tisc_sqlcode;
197	isc_sql_interprete: Tisc_sql_interprete;
198	isc_event_counts: Tisc_event_counts;
199	isc_event_block: Tisc_event_block;
200	isc_free: Tisc_free;
201
202	constructor Create(aFBLibrary: TFBLibrary);
203	procedure IBAlloc(var P; OldSize, NewSize: Integer);
204	procedure IBDataBaseError;
205	function LoadInterface: boolean; virtual;
206	procedure FBShutdown; virtual;
207	function GetAPI: IFirebirdAPI; virtual; abstract;
208	{$IFDEF UNIX}
209	function GetFirebirdLibList: string; virtual; abstract;
210	{$ENDIF}
211	function HasDecFloatSupport: boolean;
212	function HasInt128Support: boolean; virtual;
213	function HasLocalTZDB: boolean; virtual;
214	function HasExtendedTZSupport: boolean; virtual;
215	function HasTimeZoneSupport: boolean; virtual;
216
217	public
218	property LocalTimeZoneName: AnsiString read FLocalTimeZoneName;
219	property TZDataTimeZoneID: AnsiString read FTZDataTimeZoneID;
220	property LocalTimeOffset: integer read FLocalTimeOffset;
221	public
222	{Encode/Decode}
223	procedure EncodeInteger(aValue: integer; len: integer; buffer: PByte);
224	function DecodeInteger(bufptr: PByte; len: short): integer; virtual; abstract;
225	procedure SQLEncodeDate(aDate: TDateTime; bufptr: PByte); virtual; abstract;
226	function SQLDecodeDate(byfptr: PByte): TDateTime; virtual; abstract;
227	procedure SQLEncodeTime(aTime: TDateTime; bufptr: PByte); virtual; abstract;
228	function SQLDecodeTime(bufptr: PByte): TDateTime; virtual; abstract;
229	procedure SQLEncodeDateTime(aDateTime: TDateTime; bufptr: PByte); virtual; abstract;
230	function SQLDecodeDateTime(bufptr: PByte): TDateTime; virtual; abstract;
231	function FormatStatus(Status: TFBStatus): AnsiString; virtual; abstract;
232	function Int128ToStr(bufptr: PByte; scale: integer): AnsiString; virtual;
233	procedure StrToInt128(scale: integer; aValue: AnsiString; bufptr: PByte);
234	virtual;
235	procedure SQLDecFloatEncode(aValue: tBCD; SQLType: cardinal; bufptr: PByte); virtual;
236	function SQLDecFloatDecode(SQLType: cardinal; bufptr: PByte): tBCD; virtual;
237
238	{IFirebirdAPI}
239	function GetStatus: IStatus; virtual; abstract;
240	function IsLibraryLoaded: boolean;
241	function IsEmbeddedServer: boolean; virtual; abstract;
242	function GetFBLibrary: IFirebirdLibrary;
243	function GetImplementationVersion: AnsiString;
244	function GetClientMajor: integer; virtual; abstract;
245	function GetClientMinor: integer; virtual; abstract;
246	end;
247
248	implementation
249
250	uses IBUtils, Registry,
251	{$IFDEF Unix} unix, initc, dl, {$ENDIF}
252	{$IFDEF FPC}
253	{$IFDEF WINDOWS }
254	WinDirs,
255	{$ENDIF}
256	{$ELSE}
257	ShlObj,
258	{$ENDIF}
259	SysUtils;
260
261	{$IFDEF UNIX}
262	{$I 'include/uloadlibrary.inc'}
263	{$ELSE}
264	{$I 'include/wloadlibrary.inc'}
265	{$ENDIF}
266
267
268	{ TFBLibrary }
269
270	function TFBLibrary.GetOverrideLibName: string;
271	begin
272	Result := FFBLibraryName;
273	if (Result = '') and AllowUseOfFBLIB then
274	Result := GetEnvironmentVariable('FBLIB');
275	if Result = '' then
276	begin
277	if assigned(OnGetLibraryName) then
278	OnGetLibraryName(Result)
279	end;
280	end;
281
282	procedure TFBLibrary.FreeFBLibrary;
283	begin
284	(FFirebirdAPI as TFBClientAPI).FBShutdown;
285	if FIBLibrary <> NilHandle then
286	FreeLibrary(FIBLibrary);
287	FIBLibrary := NilHandle;
288	FFBLibraryName := '';
289	end;
290
291	function TFBLibrary.GetLibraryName: string;
292	begin
293	Result := ExtractFileName(FFBLibraryName);
294	end;
295
296	function TFBLibrary.GetFirebirdAPI: IFirebirdAPI;
297	begin
298	Result := FFirebirdAPI;
299	end;
300
301	constructor TFBLibrary.Create(aLibPathName: string);
302	begin
303	inherited Create;
304	SetupEnvironment;
305	FFBLibraryName := aLibPathName;
306	FIBLibrary := NilHandle;
307	FFirebirdAPI := GetFirebird3API;
308	FRequestedLibName := aLibPathName;
309	if aLibPathName <> '' then
310	begin
311	SetLength(FLibraryList,Length(FLibraryList)+1);
312	FLibraryList[Length(FLibraryList)-1] := self;
313	end;
314	if FFirebirdAPI <> nil then
315	begin
316	{First try Firebird 3}
317	if not LoadIBLibrary or not (FFirebirdAPI as TFBClientAPI).LoadInterface then
318	FFirebirdAPI := nil;
319	end;
320
321	if FFirebirdAPI = nil then
322	begin
323	{now try Firebird 2.5. Under Unix we need to reload the library in case we
324	are to use the embedded library}
325	FFirebirdAPI := GetLegacyFirebirdAPI;
326	if FFirebirdAPI <> nil then
327	begin
328	{$IFDEF UNIX}
329	FreeFBLibrary;
330	{$ENDIF}
331	if not LoadIBLibrary or not (FFirebirdAPI as TFBClientAPI).LoadInterface then
332	FFirebirdAPI := nil;
333	end;
334	end;
335	{Note: FFirebirdAPI will be set to nil if the Firebird API fails to load}
336	end;
337
338	destructor TFBLibrary.Destroy;
339	begin
340	FreeFBLibrary;
341	FFirebirdAPI := nil;
342	inherited Destroy;
343	end;
344
345	class function TFBLibrary.GetFBLibrary(aLibPathName: string): IFirebirdLibrary;
346	var i: integer;
347	begin
348	Result := nil;
349	if aLibPathName <> '' then
350	begin
351	for i := 0 to Length(FLibraryList) - 1 do
352	begin
353	if (FLibraryList[i] as TFBLibrary).SameLibrary(aLibPathName) then
354	begin
355	Result := FLibraryList[i];
356	Exit;
357	end;
358	end;
359	Result := Create(aLibPathName);
360	end;
361
362	end;
363
364	class procedure TFBLibrary.FreeLibraries;
365	var i: integer;
366	begin
367	for i := 0 to Length(FLibraryList) - 1 do
368	FLibraryList[i] := nil;
369	SetLength(FLibraryList,0);
370	end;
371
372	function TFBLibrary.SameLibrary(aLibName: string): boolean;
373	begin
374	Result := FRequestedLibName = aLibName;
375	end;
376
377	function TFBLibrary.GetHandle: TLibHandle;
378	begin
379	Result := FIBLibrary;
380	end;
381
382	{ TFBClientAPI }
383
384	constructor TFBClientAPI.Create(aFBLibrary: TFBLibrary);
385	begin
386	inherited Create;
387	FFBLibrary := aFBLibrary;
388	GetTZDataSettings;
389	end;
390
391	procedure TFBClientAPI.IBAlloc(var P; OldSize, NewSize: Integer);
392	var
393	i: Integer;
394	begin
395	ReallocMem(Pointer(P), NewSize);
396	for i := OldSize to NewSize - 1 do PAnsiChar(P)[i] := #0;
397	end;
398
399	procedure TFBClientAPI.IBDataBaseError;
400	begin
401	raise EIBInterBaseError.Create(GetStatus);
402	end;
403
404	procedure TFBClientAPI.EncodeInteger(aValue: integer; len: integer; buffer: PByte);
405	begin
406	while len > 0 do
407	begin
408	buffer^ := aValue and $FF;
409	Inc(buffer);
410	Dec(len);
411	aValue := aValue shr 8;
412	end;
413	end;
414
415	function TFBClientAPI.Int128ToStr(bufptr: PByte; scale: integer): AnsiString;
416	begin
417	if not HasInt128Support then
418	IBError(ibxeNotSupported,[]);
419	end;
420
421	procedure TFBClientAPI.StrToInt128(scale: integer; aValue: AnsiString; bufptr: PByte);
422	begin
423	if not HasInt128Support then
424	IBError(ibxeNotSupported,[]);
425	end;
426
427	procedure TFBClientAPI.SQLDecFloatEncode(aValue: tBCD; SQLType: cardinal;
428	bufptr: PByte);
429	begin
430	if not HasDecFloatSupport then
431	IBError(ibxeNotSupported,[]);
432	end;
433
434	function TFBClientAPI.SQLDecFloatDecode(SQLType: cardinal; bufptr: PByte): tBCD;
435	begin
436	if not HasDecFloatSupport then
437	IBError(ibxeNotSupported,[]);
438	end;
439
440	function TFBClientAPI.IsLibraryLoaded: boolean;
441	begin
442	Result := FFBLibrary.IBLibrary <> NilHandle;
443	end;
444
445	function TFBClientAPI.GetFBLibrary: IFirebirdLibrary;
446	begin
447	Result := FFBLibrary;
448	end;
449
450	function TFBClientAPI.FBTimeStampToDateTime(aDate, aTime: longint): TDateTime;
451	begin
452	{aDate/aTime are in TTimestamp format but aTime is decimilliseconds}
453	aDate := aDate - DateDelta;
454	if aDate < 0 then
455	Result := trunc(aDate) - abs(frac(aTime / (MSecsPerDay*10)))
456	else
457	Result := trunc(aDate) + abs(frac(aTime / (MSecsPerDay*10)));
458	end;
459
460	{$IFDEF UNIX}
461	procedure TFBClientAPI.GetTZDataSettings;
462	var S: TStringList;
463	begin
464	FLocalTimeOffset := GetLocalTimeOffset;
465	FLocalTimeZoneName := strpas(tzname[tzdaylight]);
466	FIsDaylightSavingsTime := tzdaylight;
467	if FileExists(DefaultTimeZoneFile) then
468	begin
469	S := TStringList.Create;
470	try
471	S.LoadFromFile(DefaultTimeZoneFile);
472	if S.Count > 0 then
473	FTZDataTimeZoneID := S[0];
474	finally
475	S.Free;
476	end;
477	end;
478	end;
479	{$ENDIF}
480
481	{$IFDEF WINDOWS}
482	procedure TFBClientAPI.GetTZDataSettings;
483	var TZInfo: TTimeZoneInformation;
484	begin
485	FIsDaylightSavingsTime := false;
486	{is there any way of working out the default TZData DB time zone ID under Windows?}
487	case GetTimeZoneInformation(TZInfo) of
488	TIME_ZONE_ID_UNKNOWN:
489	begin
490	FLocalTimeZoneName := '';
491	FLocalTimeOffset := 0;
492	end;
493	TIME_ZONE_ID_STANDARD:
494	begin
495	FLocalTimeZoneName := strpas(PWideChar(@TZInfo.StandardName));
496	FLocalTimeOffset := TZInfo.Bias;
497	end;
498	TIME_ZONE_ID_DAYLIGHT:
499	begin
500	FLocalTimeZoneName := strpas(PWideChar(@TZInfo.DaylightName));
501	FLocalTimeOffset := TZInfo.DayLightBias;
502	FIsDaylightSavingsTime := true;
503	end;
504	end;
505	end;
506	{$ENDIF}
507
508	function TFBClientAPI.GetProcAddr(ProcName: PAnsiChar): Pointer;
509	begin
510	Result := GetProcAddress(FFBLibrary.IBLibrary, ProcName);
511	if not Assigned(Result) then
512	raise Exception.CreateFmt(SFirebirdAPIFuncNotFound,[ProcName]);
513	end;
514
515	function TFBClientAPI.HasDecFloatSupport: boolean;
516	begin
517	Result := GetClientMajor >= 4;
518	end;
519
520	function TFBClientAPI.HasInt128Support: boolean;
521	begin
522	Result := false;
523	end;
524
525	function TFBClientAPI.HasLocalTZDB: boolean;
526	begin
527	Result := false;
528	end;
529
530	function TFBClientAPI.HasExtendedTZSupport: boolean;
531	begin
532	Result := false;
533	end;
534
535	function TFBClientAPI.HasTimeZoneSupport: boolean;
536	begin
537	Result := false;
538	end;
539
540	function TFBClientAPI.GetImplementationVersion: AnsiString;
541	begin
542	Result := Format('%d.%d',[GetClientMajor,GetClientMinor]);
543	end;
544
545	function TFBClientAPI.LoadInterface: boolean;
546	begin
547	isc_sqlcode := GetProcAddr('isc_sqlcode'); {do not localize}
548	isc_sql_interprete := GetProcAddr('isc_sql_interprete'); {do not localize}
549	isc_event_counts := GetProcAddr('isc_event_counts'); {do not localize}
550	isc_event_block := GetProcAddr('isc_event_block'); {do not localize}
551	isc_free := GetProcAddr('isc_free'); {do not localize}
552	fb_shutdown := GetProcAddr('fb_shutdown'); {do not localize}
553	Result := assigned(isc_free);
554	end;
555
556	procedure TFBClientAPI.FBShutdown;
557	begin
558	if assigned(fb_shutdown) then
559	fb_shutdown(0,fb_shutrsn_exit_called);
560	end;
561
562	{ TFBStatus }
563
564	constructor TFBStatus.Create(aOwner: TFBClientAPI);
565	begin
566	inherited Create;
567	FOwner := aOwner;
568	FIBDataBaseErrorMessages := [ShowSQLMessage, ShowIBMessage];
569	end;
570
571	function TFBStatus.GetIBErrorCode: Long;
572	begin
573	Result := StatusVector^[1];
574	end;
575
576	function TFBStatus.Getsqlcode: Long;
577	begin
578	with FOwner do
579	Result := isc_sqlcode(PISC_STATUS(StatusVector));
580	end;
581
582	function TFBStatus.GetMessage: AnsiString;
583	var local_buffer: array[0..IBHugeLocalBufferLength - 1] of AnsiChar;
584	IBDataBaseErrorMessages: TIBDataBaseErrorMessages;
585	sqlcode: Long;
586	begin
587	Result := '';
588	IBDataBaseErrorMessages := FIBDataBaseErrorMessages;
589	sqlcode := Getsqlcode;
590	if (ShowSQLCode in IBDataBaseErrorMessages) then
591	Result := Result + 'SQLCODE: ' + IntToStr(sqlcode); {do not localize}
592
593	Exclude(IBDataBaseErrorMessages, ShowSQLMessage);
594	if (ShowSQLMessage in IBDataBaseErrorMessages) then
595	begin
596	with FOwner do
597	isc_sql_interprete(sqlcode, local_buffer, sizeof(local_buffer));
598	if (ShowSQLCode in FIBDataBaseErrorMessages) then
599	Result := Result + CRLF;
600	Result := Result + strpas(local_buffer);
601	end;
602
603	if (ShowIBMessage in IBDataBaseErrorMessages) then
604	begin
605	if (ShowSQLCode in IBDataBaseErrorMessages) or
606	(ShowSQLMessage in IBDataBaseErrorMessages) then
607	Result := Result + LineEnding;
608	Result := Result + FOwner.FormatStatus(self);
609	end;
610	if (Result <> '') and (Result[Length(Result)] = '.') then
611	Delete(Result, Length(Result), 1);
612	end;
613
614	function TFBStatus.CheckStatusVector(ErrorCodes: array of TFBStatusCode
615	): Boolean;
616	var
617	p: PISC_STATUS;
618	i: Integer;
619	procedure NextP(i: Integer);
620	begin
621	p := PISC_STATUS(PAnsiChar(p) + (i * SizeOf(ISC_STATUS)));
622	end;
623	begin
624	p := PISC_STATUS(StatusVector);
625	result := False;
626	while (p^ <> 0) and (not result) do
627	case p^ of
628	3: NextP(3);
629	1, 4:
630	begin
631	NextP(1);
632	i := 0;
633	while (i <= High(ErrorCodes)) and (not result) do
634	begin
635	result := p^ = ErrorCodes[i];
636	Inc(i);
637	end;
638	NextP(1);
639	end;
640	else
641	NextP(2);
642	end;
643	end;
644
645	function TFBStatus.GetIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
646	begin
647	EnterCriticalSection(TFBClientAPI.FIBCS);
648	try
649	result := FIBDataBaseErrorMessages;
650	finally
651	LeaveCriticalSection(TFBClientAPI.FIBCS);
652	end;
653	end;
654
655	procedure TFBStatus.SetIBDataBaseErrorMessages(Value: TIBDataBaseErrorMessages);
656	begin
657	EnterCriticalSection(TFBClientAPI.FIBCS);
658	try
659	FIBDataBaseErrorMessages := Value;
660	finally
661	LeaveCriticalSection(TFBClientAPI.FIBCS);
662	end;
663	end;
664
665	initialization
666	TFBLibrary.FEnvSetupDone := false;
667	{$IFNDEF FPC}
668	InitializeCriticalSection(TFBClientAPI.FIBCS);
669	{$ELSE}
670	InitCriticalSection(TFBClientAPI.FIBCS);
671	{$ENDIF}
672
673	finalization
674	TFBLibrary.FreeLibraries;
675	{$IFNDEF FPC}
676	DeleteCriticalSection(TFBClientAPI.FIBCS);
677	{$ELSE}
678	DoneCriticalSection(TFBClientAPI.FIBCS);
679	{$ENDIF}
680	end.
681