lazarus-ccr/components/onguard/source/ogfile.pas

(****** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * 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 is TurboPower OnGuard
 *
 * The Initial Developer of the Original Code is
 * TurboPower Software
 *
 * Portions created by the Initial Developer are Copyright (C) 1996-2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Andrew Haines         andrew@haines.name                        {AH.01}
 *                       conversion to CLX                         {AH.01}
 *                       December 30, 2003                         {AH.01}
 *
 * ***** END LICENSE BLOCK ***** *)
{*********************************************************}
{*                   OGFILE.PAS 1.13                     *}
{*     Copyright (c) 1996-02 TurboPower Software Co      *}
{*                 All rights reserved.                  *}
{*********************************************************}

{$I ONGUARD.INC}


unit ogfile;                                                       {AH.01}


interface

uses
  {$IFDEF MSWINDOWS} Windows, {$ENDIF}                             {AH.01}
  {$IFDEF LINUX} BaseUnix, {$ENDIF}                                    {AH.01}
  SysUtils,
  ogutil;                                                          {AH.01}


function GetFileSize(Handle : THandle) : Cardinal;

{$IFNDEF Win32}
function LockFile(hFile: THandle; dwFileOffsetLow, dwFileOffsetHigh: DWORD;
 nNumberOfBytesToLockLow, nNumberOfBytesToLockHigh: DWORD): Boolean;
function UnlockFile(hFile: THandle; dwFileOffsetLow, dwFileOffsetHigh: DWORD;
 nNumberOfBytesToUnlockLow, nNumberOfBytesToUnlockHigh: DWORD): Boolean;
{
function LockFile(Handle : THandle; FileOffsetLow, FileOffsetHigh,
                  LockCountLow, LockCountHigh : Word) : Boolean;
function UnlockFile(Handle : THandle; FileOffsetLow, FileOffsetHigh,
                    UnLockCountLow, UnLockCountHigh : Word) : Boolean;
}
function FlushFileBuffers(Handle : THandle) : Boolean;
{$ENDIF}



implementation


function GetFileSize(Handle : THandle) : Cardinal;
{$IFDEF Win32}
begin
  Result := Windows.GetFileSize(Handle, nil);
{$ELSE}
var
  Save : LongInt;
begin
  Save := FileSeek(Handle, 0, 0);     {save current file position}
  Result := FileSeek(Handle, 0, 2);   {get file size}
  FileSeek(Handle, Save, 0);          {restore previous position}
{$ENDIF}
end;



{$IFNDEF WIN32}


{$ifdef FPC}
const
   F_RDLCK = 0;
   F_WRLCK = 1;
   F_UNLCK = 2;
   F_EXLCK = 4;
   F_SHLCK = 8;

   LOCK_SH = 1;
   LOCK_EX = 2;
   LOCK_NB = 4;
   LOCK_UN = 8;

   LOCK_MAND = 32;
   LOCK_READ = 64;
   LOCK_WRITE = 128;
   LOCK_RW = 192;

   EACCES = ESysEACCES;
   EAGAIN = ESysEAGAIN;
{$endif}



function GetLastError: Integer;
begin
  Result := FpGetErrno;
end;

procedure SetLastError(Value: Integer);
begin
  FpSetErrno(Value);
end;

function LockFile(hFile: THandle; dwFileOffsetLow, dwFileOffsetHigh: DWORD; nNumberOfBytesToLockLow, nNumberOfBytesToLockHigh: DWORD): Boolean;
var
  FLockInfo: {$ifdef FPC}BaseUnix.FLock{$else}TFLock{$endif};
  FLastError: Cardinal;
begin
  Result := false;
  FLockInfo.l_type := F_WRLCK;
  FLockInfo.l_whence := SEEK_SET;
  FLockInfo.l_start := dwFileOffsetLow;
  FLockInfo.l_len := nNumberOfBytesToLockLow;
  FLockInfo.l_pid := {$ifdef FPC}fpgetpid{$else}getpid{$endif}();
  Result := {$ifdef FPC}fpfcntl{$else}fcntl{$endif}(hFile, F_SETLK, FLockInfo) <> -1;
  if not Result then
  begin
    FLastError := GetLastError();
    if (FLastError = EACCES) or (FLastError = EAGAIN) then
      SetLastError(ESysEACCES)
    else
      Result := True; // If errno is ENOLCK or EINVAL
  end;
end;

function UnlockFile(hFile: THandle; dwFileOffsetLow, dwFileOffsetHigh: DWORD; nNumberOfBytesToUnlockLow, nNumberOfBytesToUnlockHigh: DWORD): Boolean;
var
  FLockInfo: {$ifdef FPC}BaseUnix.FLock{$else}TFLock{$endif};
begin
  FLockInfo.l_type := F_UNLCK;
  FLockInfo.l_whence := SEEK_SET;
  FLockInfo.l_start := dwFileOffsetLow;
  FLockInfo.l_len := nNumberOfBytesToUnLockLow;
  FLockInfo.l_pid := {$ifdef FPC}fpgetpid{$else}getpid{$endif}();
  Result := {$ifdef FPC}fpfcntl{$else}fcntl{$endif}(hFile, F_SETLK, FLockInfo) <> -1;
end;




{
function LockFile(Handle : THandle;
                  FileOffsetLow, FileOffsetHigh,
                  LockCountLow, LockCountHigh : Word) : Boolean;
var
   LockVar : TFlock;
begin
  LockVar.l_whence := SEEK_SET;
  LockVar.l_start := FileOffSetHigh;
  LockVar.l_start := (LockVar.l_start shl 16) + FileOffSetLow;
  LockVar.l_len := LockCountHigh;
  LockVar.l_len := (LockVar.l_len shl 16) + LockCountLow;
  LockVar.l_type := F_WRLCK;

  if fcntl(Handle, F_SETLK, LockVar) = 0 then Result := True else Result := False;
end;

function UnlockFile(Handle : THandle;
                    FileOffsetLow, FileOffsetHigh,
                    UnLockCountLow, UnLockCountHigh : Word) : Boolean;
var
   LockVar : TFlock;
begin

  LockVar.l_whence := SEEK_SET;
  LockVar.l_start := FileOffSetHigh;
  LockVar.l_start := (LockVar.l_start shl 16) + FileOffSetLow;
  LockVar.l_len := UnLockCountHigh;
  LockVar.l_len := (LockVar.l_len shl 16) + UnLockCountLow;
  LockVar.l_type := F_UNLCK;

  if fcntl(Handle, F_SETLK, LockVar) = 0 then Result := True else Result := False;
end;
}

function FlushFileBuffers(Handle : THandle) : Boolean;
begin
  Result := True;
end;
{$ENDIF}



end.