GenCodeHook, Version 1.5 (alt)
Hinweis: dies ist nicht die neueste Version!
Datei: CodeMem.pas
{ CodeMem.pas Delphi unit containing a functions for virtually allocated memory that allows execution of run-time created code. This way the allocate and free function can be replaced by user-defined (optimized) ones. Version 1.4 - Always find the most current version at http://flocke.vssd.de/prog/code/pascal/codehook/ Copyright (C) 2005, 2006 Volker Siebert <flocke@vssd.de> All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. } unit CodeMem; interface uses Windows, SysUtils; type TCodeMemoryManager = record GetMem: function(Size: Integer): Pointer; FreeMem: function(P: Pointer): Integer; ReallocMem: function(P: Pointer; Size: Integer): Pointer; end; procedure GetCodeMemManager(var MemMgr: TCodeMemoryManager); procedure SetCodeMemManager(const MemMgr: TCodeMemoryManager); procedure ResetCodeMemManager; function IsCodeMemManagerSet: Boolean; function SysGetCodeMem(Size: integer): pointer; function SysReallocCodeMem(P: pointer; Size: integer): pointer; function SysFreeCodeMem(P: pointer): integer; function AllocCodeMem(Size: integer): pointer; function FreeCodeMem(P: pointer): integer; implementation { The code memory manager } var CodeMemManager: TCodeMemoryManager = ( GetMem: SysGetMem; FreeMem: SysFreeMem; ReallocMem: SysReallocMem ); { Code memory manager access } procedure GetCodeMemManager(var MemMgr: TCodeMemoryManager); begin MemMgr := CodeMemManager; end; procedure SetCodeMemManager(const MemMgr: TCodeMemoryManager); begin CodeMemManager := MemMgr; end; procedure ResetCodeMemManager; begin with CodeMemManager do begin GetMem := SysGetMem; FreeMem := SysFreeMem; ReallocMem := SysReallocMem end; end; function IsCodeMemManagerSet: Boolean; begin with CodeMemManager do Result := (@GetMem <> @SysGetCodeMem) or (@FreeMem <> @SysFreeCodeMem) or (@ReallocMem <> @SysReallocCodeMem); end; { Default functions } function SysGetCodeMem(Size: integer): pointer; begin Result := VirtualAlloc(nil, Size, MEM_COMMIT, PAGE_EXECUTE_READWRITE); end; function SysReallocCodeMem(P: pointer; Size: integer): pointer; begin SetLastError(ERROR_NOT_ENOUGH_MEMORY); Result := nil; end; function SysFreeCodeMem(P: pointer): integer; begin Result := Ord(VirtualFree(P, 0, MEM_RELEASE) = FALSE); end; { Public interface functions } function AllocCodeMem(Size: integer): pointer; begin if Size = 0 then Size := 1; Result := CodeMemManager.GetMem(Size); if Result = nil then RaiseLastOsError; FillChar(Result^, Size, 0); end; function FreeCodeMem(P: pointer): integer; begin Result := CodeMemManager.FreeMem(P); if Result <> 0 then RaiseLastOsError; end; end. |