fbintf/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;

{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}

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;
    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;

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

  { TFBClientAPI }

  TFBClientAPI = class(TFBInterfacedObject)
  private
    class var FIBCS: TRTLCriticalSection;
  protected
    FFBLibrary: TFBLibrary;
    function GetProcAddr(ProcName: PAnsiChar): Pointer;
  public
    {Taken from legacy API}
    isc_sqlcode: Tisc_sqlcode;
    isc_sql_interprete: Tisc_sql_interprete;
    isc_interprete: Tisc_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;
    function GetAPI: IFirebirdAPI; virtual; abstract;
    {$IFDEF UNIX}
    function GetFirebirdLibList: string; virtual; abstract;
    {$ENDIF}

    {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;


    {IFirebirdAPI}
    function GetStatus: IStatus; virtual; abstract;
    function IsLibraryLoaded: boolean;
    function IsEmbeddedServer: boolean; virtual; abstract;
    function GetFBLibrary: IFirebirdLibrary;
end;

implementation

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

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

{$IFDEF UNIX}
{$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
  if FIBLibrary <> NilHandle then
    FreeLibrary(FIBLibrary);
  FIBLibrary := NilHandle;
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
  FFirebirdAPI := nil;
  FreeFBLibrary;
  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
      if (FLibraryList[i] as TFBLibrary).FRequestedLibName = aLibPathName then
      begin
        Result := FLibraryList[i];
        Exit;
      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.GetHandle: TLibHandle;
begin
  Result := FIBLibrary;
end;

{ TFBClientAPI }

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

{Under Unixes, if using an embedded server then set up local TMP and LOCK Directories}

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

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

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.LoadInterface: boolean;
begin
  isc_sqlcode := GetProcAddr('isc_sqlcode'); {do not localize}
  isc_sql_interprete := GetProcAddr('isc_sql_interprete'); {do not localize}
  isc_interprete := GetProcAddr('isc_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}
  Result := assigned(isc_free);
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;
    psb: PStatusVector;
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, IBLocalBufferLength);
    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 + CRLF;
    psb := StatusVector;
    with FOwner do
    while (isc_interprete(@local_buffer, @psb) > 0) do
    begin
      if (Result <> '') and (Result[Length(Result)] <> LF) then
        Result := Result + CRLF;
      Result := Result + strpas(local_buffer);
    end;
  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:	263
Committed:	Thu Dec 6 15:55:01 2018 UTC (5 years, 4 months ago) by tony
Content type:	text/x-pascal
Original Path:	*ibx/trunk/fbintf/client/FBClientAPI.pas*
File size:	15359 byte(s)
Log Message:	Release 2.3.2 committed
#	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;
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	type
94	TStatusVector = array[0..19] of NativeInt;
95	PStatusVector = ^TStatusVector;
96
97	TFBClientAPI = class;
98
99	{ TFBStatus }
100
101	TFBStatus = class(TFBInterfacedObject)
102	private
103	FIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
104	protected
105	FOwner: TFBClientAPI;
106	public
107	constructor Create(aOwner: TFBClientAPI);
108	function StatusVector: PStatusVector; virtual; abstract;
109
110	{IStatus}
111	function GetIBErrorCode: Long;
112	function Getsqlcode: Long;
113	function GetMessage: AnsiString;
114	function CheckStatusVector(ErrorCodes: array of TFBStatusCode): Boolean;
115	function GetIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
116	procedure SetIBDataBaseErrorMessages(Value: TIBDataBaseErrorMessages);
117	end;
118
119	{ TFBLibrary }
120
121	TFBLibrary = class(TFBInterfacedObject,IFirebirdLibrary)
122	private
123	class var FEnvSetupDone: boolean;
124	class var FLibraryList: array of IFirebirdLibrary;
125	FFirebirdAPI: IFirebirdAPI;
126	FRequestedLibName: string;
127	function LoadIBLibrary: boolean;
128	protected
129	FFBLibraryName: string;
130	FIBLibrary: TLibHandle;
131	procedure FreeFBLibrary;
132	function GetOverrideLibName: string;
133	class procedure SetupEnvironment;
134	protected
135	function GetFirebird3API: IFirebirdAPI; virtual; abstract;
136	function GetLegacyFirebirdAPI: IFirebirdAPI; virtual; abstract;
137	public
138	constructor Create(aLibPathName: string='');
139	destructor Destroy; override;
140	class function GetFBLibrary(aLibPathName: string): IFirebirdLibrary;
141	class procedure FreeLibraries;
142
143	{IFirebirdLibrary}
144	function GetHandle: TLibHandle;
145	function GetLibraryName: string;
146	function GetLibraryFilePath: string;
147	function GetFirebirdAPI: IFirebirdAPI;
148	property IBLibrary: TLibHandle read FIBLibrary;
149	end;
150
151	{ TFBClientAPI }
152
153	TFBClientAPI = class(TFBInterfacedObject)
154	private
155	class var FIBCS: TRTLCriticalSection;
156	protected
157	FFBLibrary: TFBLibrary;
158	function GetProcAddr(ProcName: PAnsiChar): Pointer;
159	public
160	{Taken from legacy API}
161	isc_sqlcode: Tisc_sqlcode;
162	isc_sql_interprete: Tisc_sql_interprete;
163	isc_interprete: Tisc_interprete;
164	isc_event_counts: Tisc_event_counts;
165	isc_event_block: Tisc_event_block;
166	isc_free: Tisc_free;
167
168	constructor Create(aFBLibrary: TFBLibrary);
169	procedure IBAlloc(var P; OldSize, NewSize: Integer);
170	procedure IBDataBaseError;
171	function LoadInterface: boolean; virtual;
172	function GetAPI: IFirebirdAPI; virtual; abstract;
173	{$IFDEF UNIX}
174	function GetFirebirdLibList: string; virtual; abstract;
175	{$ENDIF}
176
177	{Encode/Decode}
178	procedure EncodeInteger(aValue: integer; len: integer; buffer: PByte);
179	function DecodeInteger(bufptr: PByte; len: short): integer; virtual; abstract;
180	procedure SQLEncodeDate(aDate: TDateTime; bufptr: PByte); virtual; abstract;
181	function SQLDecodeDate(byfptr: PByte): TDateTime; virtual; abstract;
182	procedure SQLEncodeTime(aTime: TDateTime; bufptr: PByte); virtual; abstract;
183	function SQLDecodeTime(bufptr: PByte): TDateTime; virtual; abstract;
184	procedure SQLEncodeDateTime(aDateTime: TDateTime; bufptr: PByte); virtual; abstract;
185	function SQLDecodeDateTime(bufptr: PByte): TDateTime; virtual; abstract;
186
187
188	{IFirebirdAPI}
189	function GetStatus: IStatus; virtual; abstract;
190	function IsLibraryLoaded: boolean;
191	function IsEmbeddedServer: boolean; virtual; abstract;
192	function GetFBLibrary: IFirebirdLibrary;
193	end;
194
195	implementation
196
197	uses IBUtils, Registry,
198	{$IFDEF Unix} initc, dl, {$ENDIF}
199	{$IFDEF FPC}
200	{$IFDEF WINDOWS }
201	WinDirs,
202	{$ENDIF}
203	{$ELSE}
204	ShlObj,
205	{$ENDIF}
206	SysUtils;
207
208	const
209	IBLocalBufferLength = 512;
210	IBBigLocalBufferLength = IBLocalBufferLength * 2;
211	IBHugeLocalBufferLength = IBBigLocalBufferLength * 20;
212
213	{$IFDEF UNIX}
214	{$I 'include/uloadlibrary.inc'}
215	{$ELSE}
216	{$I 'include/wloadlibrary.inc'}
217	{$ENDIF}
218
219
220	{ TFBLibrary }
221
222	function TFBLibrary.GetOverrideLibName: string;
223	begin
224	Result := FFBLibraryName;
225	if (Result = '') and AllowUseOfFBLIB then
226	Result := GetEnvironmentVariable('FBLIB');
227	if Result = '' then
228	begin
229	if assigned(OnGetLibraryName) then
230	OnGetLibraryName(Result)
231	end;
232	end;
233
234	procedure TFBLibrary.FreeFBLibrary;
235	begin
236	if FIBLibrary <> NilHandle then
237	FreeLibrary(FIBLibrary);
238	FIBLibrary := NilHandle;
239	end;
240
241	function TFBLibrary.GetLibraryName: string;
242	begin
243	Result := ExtractFileName(FFBLibraryName);
244	end;
245
246	function TFBLibrary.GetFirebirdAPI: IFirebirdAPI;
247	begin
248	Result := FFirebirdAPI;
249	end;
250
251	constructor TFBLibrary.Create(aLibPathName: string);
252	begin
253	inherited Create;
254	SetupEnvironment;
255	FFBLibraryName := aLibPathName;
256	FIBLibrary := NilHandle;
257	FFirebirdAPI := GetFirebird3API;
258	FRequestedLibName := aLibPathName;
259	if aLibPathName <> '' then
260	begin
261	SetLength(FLibraryList,Length(FLibraryList)+1);
262	FLibraryList[Length(FLibraryList)-1] := self;
263	end;
264	if FFirebirdAPI <> nil then
265	begin
266	{First try Firebird 3}
267	if not LoadIBLibrary or not (FFirebirdAPI as TFBClientAPI).LoadInterface then
268	FFirebirdAPI := nil;
269	end;
270
271	if FFirebirdAPI = nil then
272	begin
273	{now try Firebird 2.5. Under Unix we need to reload the library in case we
274	are to use the embedded library}
275	FFirebirdAPI := GetLegacyFirebirdAPI;
276	if FFirebirdAPI <> nil then
277	begin
278	{$IFDEF UNIX}
279	FreeFBLibrary;
280	{$ENDIF}
281	if not LoadIBLibrary or not (FFirebirdAPI as TFBClientAPI).LoadInterface then
282	FFirebirdAPI := nil;
283	end;
284	end;
285	{Note: FFirebirdAPI will be set to nil if the Firebird API fails to load}
286	end;
287
288	destructor TFBLibrary.Destroy;
289	begin
290	FFirebirdAPI := nil;
291	FreeFBLibrary;
292	inherited Destroy;
293	end;
294
295	class function TFBLibrary.GetFBLibrary(aLibPathName: string): IFirebirdLibrary;
296	var i: integer;
297	begin
298	Result := nil;
299	if aLibPathName <> '' then
300	begin
301	for i := 0 to Length(FLibraryList) - 1 do
302	if (FLibraryList[i] as TFBLibrary).FRequestedLibName = aLibPathName then
303	begin
304	Result := FLibraryList[i];
305	Exit;
306	end;
307	Result := Create(aLibPathName);
308	end;
309
310	end;
311
312	class procedure TFBLibrary.FreeLibraries;
313	var i: integer;
314	begin
315	for i := 0 to Length(FLibraryList) - 1 do
316	FLibraryList[i] := nil;
317	SetLength(FLibraryList,0);
318	end;
319
320	function TFBLibrary.GetHandle: TLibHandle;
321	begin
322	Result := FIBLibrary;
323	end;
324
325	{ TFBClientAPI }
326
327	constructor TFBClientAPI.Create(aFBLibrary: TFBLibrary);
328	begin
329	inherited Create;
330	FFBLibrary := aFBLibrary;
331	end;
332
333	procedure TFBClientAPI.IBAlloc(var P; OldSize, NewSize: Integer);
334	var
335	i: Integer;
336	begin
337	ReallocMem(Pointer(P), NewSize);
338	for i := OldSize to NewSize - 1 do PAnsiChar(P)[i] := #0;
339	end;
340
341	procedure TFBClientAPI.IBDataBaseError;
342	begin
343	raise EIBInterBaseError.Create(GetStatus);
344	end;
345
346	{Under Unixes, if using an embedded server then set up local TMP and LOCK Directories}
347
348	procedure TFBClientAPI.EncodeInteger(aValue: integer; len: integer; buffer: PByte);
349	begin
350	while len > 0 do
351	begin
352	buffer^ := aValue and $FF;
353	Inc(buffer);
354	Dec(len);
355	aValue := aValue shr 8;
356	end;
357	end;
358
359	function TFBClientAPI.IsLibraryLoaded: boolean;
360	begin
361	Result := FFBLibrary.IBLibrary <> NilHandle;
362	end;
363
364	function TFBClientAPI.GetFBLibrary: IFirebirdLibrary;
365	begin
366	Result := FFBLibrary;
367	end;
368
369	function TFBClientAPI.GetProcAddr(ProcName: PAnsiChar): Pointer;
370	begin
371	Result := GetProcAddress(FFBLibrary.IBLibrary, ProcName);
372	if not Assigned(Result) then
373	raise Exception.CreateFmt(SFirebirdAPIFuncNotFound,[ProcName]);
374	end;
375
376	function TFBClientAPI.LoadInterface: boolean;
377	begin
378	isc_sqlcode := GetProcAddr('isc_sqlcode'); {do not localize}
379	isc_sql_interprete := GetProcAddr('isc_sql_interprete'); {do not localize}
380	isc_interprete := GetProcAddr('isc_interprete'); {do not localize}
381	isc_event_counts := GetProcAddr('isc_event_counts'); {do not localize}
382	isc_event_block := GetProcAddr('isc_event_block'); {do not localize}
383	isc_free := GetProcAddr('isc_free'); {do not localize}
384	Result := assigned(isc_free);
385	end;
386
387	{ TFBStatus }
388
389	constructor TFBStatus.Create(aOwner: TFBClientAPI);
390	begin
391	inherited Create;
392	FOwner := aOwner;
393	FIBDataBaseErrorMessages := [ShowSQLMessage, ShowIBMessage];
394	end;
395
396	function TFBStatus.GetIBErrorCode: Long;
397	begin
398	Result := StatusVector^[1];
399	end;
400
401	function TFBStatus.Getsqlcode: Long;
402	begin
403	with FOwner do
404	Result := isc_sqlcode(PISC_STATUS(StatusVector));
405	end;
406
407	function TFBStatus.GetMessage: AnsiString;
408	var local_buffer: array[0..IBHugeLocalBufferLength - 1] of AnsiChar;
409	IBDataBaseErrorMessages: TIBDataBaseErrorMessages;
410	sqlcode: Long;
411	psb: PStatusVector;
412	begin
413	Result := '';
414	IBDataBaseErrorMessages := FIBDataBaseErrorMessages;
415	sqlcode := Getsqlcode;
416	if (ShowSQLCode in IBDataBaseErrorMessages) then
417	Result := Result + 'SQLCODE: ' + IntToStr(sqlcode); {do not localize}
418
419	Exclude(IBDataBaseErrorMessages, ShowSQLMessage);
420	if (ShowSQLMessage in IBDataBaseErrorMessages) then
421	begin
422	with FOwner do
423	isc_sql_interprete(sqlcode, local_buffer, IBLocalBufferLength);
424	if (ShowSQLCode in FIBDataBaseErrorMessages) then
425	Result := Result + CRLF;
426	Result := Result + strpas(local_buffer);
427	end;
428
429	if (ShowIBMessage in IBDataBaseErrorMessages) then
430	begin
431	if (ShowSQLCode in IBDataBaseErrorMessages) or
432	(ShowSQLMessage in IBDataBaseErrorMessages) then
433	Result := Result + CRLF;
434	psb := StatusVector;
435	with FOwner do
436	while (isc_interprete(@local_buffer, @psb) > 0) do
437	begin
438	if (Result <> '') and (Result[Length(Result)] <> LF) then
439	Result := Result + CRLF;
440	Result := Result + strpas(local_buffer);
441	end;
442	end;
443	if (Result <> '') and (Result[Length(Result)] = '.') then
444	Delete(Result, Length(Result), 1);
445	end;
446
447	function TFBStatus.CheckStatusVector(ErrorCodes: array of TFBStatusCode
448	): Boolean;
449	var
450	p: PISC_STATUS;
451	i: Integer;
452	procedure NextP(i: Integer);
453	begin
454	p := PISC_STATUS(PAnsiChar(p) + (i * SizeOf(ISC_STATUS)));
455	end;
456	begin
457	p := PISC_STATUS(StatusVector);
458	result := False;
459	while (p^ <> 0) and (not result) do
460	case p^ of
461	3: NextP(3);
462	1, 4:
463	begin
464	NextP(1);
465	i := 0;
466	while (i <= High(ErrorCodes)) and (not result) do
467	begin
468	result := p^ = ErrorCodes[i];
469	Inc(i);
470	end;
471	NextP(1);
472	end;
473	else
474	NextP(2);
475	end;
476	end;
477
478	function TFBStatus.GetIBDataBaseErrorMessages: TIBDataBaseErrorMessages;
479	begin
480	EnterCriticalSection(TFBClientAPI.FIBCS);
481	try
482	result := FIBDataBaseErrorMessages;
483	finally
484	LeaveCriticalSection(TFBClientAPI.FIBCS);
485	end;
486	end;
487
488	procedure TFBStatus.SetIBDataBaseErrorMessages(Value: TIBDataBaseErrorMessages);
489	begin
490	EnterCriticalSection(TFBClientAPI.FIBCS);
491	try
492	FIBDataBaseErrorMessages := Value;
493	finally
494	LeaveCriticalSection(TFBClientAPI.FIBCS);
495	end;
496	end;
497
498	initialization
499	TFBLibrary.FEnvSetupDone := false;
500	{$IFNDEF FPC}
501	InitializeCriticalSection(TFBClientAPI.FIBCS);
502	{$ELSE}
503	InitCriticalSection(TFBClientAPI.FIBCS);
504	{$ENDIF}
505
506	finalization
507	TFBLibrary.FreeLibraries;
508	{$IFNDEF FPC}
509	DeleteCriticalSection(TFBClientAPI.FIBCS);
510	{$ELSE}
511	DoneCriticalSection(TFBClientAPI.FIBCS);
512	{$ENDIF}
513	end.
514