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HVDll.pas
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HVDll.pas
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{ HVDll.pas } //# version: 2024.0117.2130
unit HVDll;
//#
//# Support for DelayLoading of DLLs la "VC++ 6.0"
//# Written by Hallvard Vassbotn ([email protected]), January 1999.
//#
//# Latest source: https://github.com/pult/dll_load_delay
//# Base source: http://hallvards.blogspot.com/2008/03/tdm8-delayloading-of-dlls.html
//#
interface
{$UNDEF SUPPORTED}
{$IFDEF FPC} //#TODO: Check FPC
{$IFDEF WIN32}
{$DEFINE MSWINDOWS}
{$ENDIF}
{$IFDEF WIN64}
{$DEFINE MSWINDOWS}
{$ENDIF}
//
{$IFDEF MSWINDOWS}
{$IFDEF CPUX86}
{$DEFINE SUPPORTED}
{$ENDIF}
{$IFDEF CPUX64}
{$DEFINE SUPPORTED}
{$ENDIF}
{$ELSE !MSWINDOWS}
{$ENDIF !MSWINDOWS}
{$IFDEF WIN32}
{$DEFINE MSWINDOWS}
{$DEFINE SUPPORTED}
{$ELSE !WIN32}
{$IFDEF CPUX86}
{-DEFINE SUPPORTED}
{$ENDIF}
{$ENDIF !WIN32}
{$ELSE !FPS}
// 32 Bits
{$IFNDEF CONDITIONALEXPRESSIONS}
{$DEFINE CPU32}
{$DEFINE CPU386}
{$DEFINE CPUX86}
{$IFNDEF LINUX}
{$DEFINE WIN32}
{$DEFINE MSWINDOWS}
{$DEFINE SUPPORTED} //# old delphi compilers
{$ELSE}
{-DEFINE SUPPORTED} //#TODO: Check Kylix
{$ENDIF}
{$ELSE !CONDITIONALEXPRESSIONS}
{$IFDEF CPUX86}
{$DEFINE CPU32}
{$DEFINE CPU386}
{$ENDIF}
{$IFDEF CPU386}
{$DEFINE CPU32}
{$DEFINE CPUX86}
{$ENDIF}
{$IFDEF CPU32BITS}
{$DEFINE CPU32}
{$ENDIF}
//
{$IFDEF WIN32}
{$DEFINE CPU32}
{$DEFINE CPU32BITS}
{$DEFINE MSWINDOWS}
{$IFDEF CPUX86}
{$DEFINE SUPPORTED}
{$ELSE}
{-DEFINE SUPPORTED} //# ?
{$ENDIF}
{$ELSE !WIN32}
{$IFDEF CPU32}
{$IFDEF CPUX86}
//{$IFDEF LINUX}
// {-DEFINE SUPPORTED} //#TODO: Check x86 Linux
//{$ENDIF}
//{$IFDEF MACOS}
// {-DEFINE SUPPORTED} //#TODO: Check x86 MACOS
//{$ENDIF}
{$ENDIF}
{$ENDIF}
{$ENDIF !WIN32}
// 64 Bits
{$IFDEF CPUX64}
{$DEFINE CPU64}
{$ENDIF}
{$IFDEF CPU64BITS}
{$DEFINE CPU64}
{$ENDIF}
//
{$IFDEF WIN64}
{$IFDEF CPUX64}
{$DEFINE SUPPORTED}
{$ENDIF}
{$ELSE !WIN64}
{$IFDEF CPU64}
{$IFDEF CPUX64}
{$IFDEF LINUX}
{-DEFINE SUPPORTED} //#TODO: Check x64 Linux
{$ENDIF}
{$IFDEF MACOS}
{-DEFINE SUPPORTED} //#TODO: Check x64 MACOS
{$ENDIF}
{$ENDIF}
{$ENDIF}
{$ENDIF !WIN64}
{$ENDIF !CONDITIONALEXPRESSIONS}
{$ENDIF !FPC}
{$UNDEF _DCC_MSG_} {no change} //# when dcc unsupported directives: $MESSAGE $WARN
{$IFNDEF FPC}
{$IFDEF UNICODE}
{$DEFINE _DCC_MSG_} // optional
{$ELSE}
{$IFDEF VER185} //# -D11/D2007
{$DEFINE _DCC_MSG_} // optional
{$ENDIF}
{$IFDEF VER180} //# -D12/2009
{$DEFINE _DCC_MSG_} // optional
{$ENDIF}
{$ENDIF}
{$ENDIF}
{$UNDEF _TEST_} //@dbg
//#
//#TEST:
//#
{$IFDEF CPUX64}
{$if defined(_IDE_) and defined(_DEBUG_) and defined(_TEST_)}
{-DEFINE SUPPORTED} //#TODO: Check FPC: WIN32, WIN64
{$ifend}
{$ENDIF}
//#
//#TEST.
//#
{$IFDEF SUPPORTED}
{$UNDEF _MINI_}
{$DEFINE _MINI_} { optional }
{$undef allow_inline} { no change }
{$define allow_inline} { optional }
{$IFDEF FPC}
{-WARNINGS OFF}
{-HINTS OFF}
{$MODE OBJFPC}
{-MODE DELPHI}
{$H+} //# Huge String (not ShortString)
{-DEFINE UNICODE} { optional }
{$ASMMODE INTEL}
{$B-,R-}
{$Q-}
{$J+}
{$ASSERTIONS OFF}
{$ALIGN 8} //# For packed record
{$MINENUMSIZE 1}
{$ELSE !FPC}
{$B-,R-}
{$ASSERTIONS OFF}
{$IFDEF UNICODE}
{$ALIGN 8} //# For packed record
{$MINENUMSIZE 1}
{$WARN UNSAFE_CAST OFF} // W1048 Unsafe typecast of '*' to '*'
{$IFDEF CONDITIONALEXPRESSIONS}
{$IF CompilerVersion >= 25.00} // XE4_UP
{$ZEROBASEDSTRINGS OFF}
{$IF CompilerVersion >= 33.00}
{$WARN EXPLICIT_STRING_CAST OFF} // W1059 Explicit string cast from 'AnsiString' to 'string'
{$WARN IMPLICIT_INTEGER_CAST_LOSS OFF} // W1071 Implicit integer cast with potential data loss from '*' to '*'
{$IFEND}
{$ELSE}
{$IFEND}
{-undef allow_inline} // optional
{$ELSE !CONDITIONALEXPRESSIONS}
{$undef allow_inline} { no change }
{$ENDIF !CONDITIONALEXPRESSIONS}
{$ELSE !UNICODE}
{$ALIGN 8} //# For packed record
{$undef allow_inline} { no change }
{$ENDIF !UNICODE}
{$ENDIF !FPC}
//{$IFOPT D+}
// {$UNDEF _OPT_DEBUG_OFF_}
//{$ELSE}
// {$DEFINE _OPT_DEBUG_OFF_}
//{$ENDIF}
uses
Windows,
{$IFNDEF FPC}
Types,
{$ENDIF !FPC}
{$IFDEF _MINI_}
SysUtils, // optional
{$ELSE}
Classes,
SysUtils,
{$ENDIF}
HVHeaps;
const
HVDLL_VERSION = 202401172130;
//# format : yyyymmddhhnn #.
{$EXTERNALSYM HVDLL_VERSION}
uHVDll = HVDLL_VERSION // {$if defined(FPC) or (CompilerVersion >= 18.50)} deprecated{$ifend}
//-{$if defined(FPC) or (CompilerVersion >= 24.00)}
//-'Symbol uHVDll is considered deprecated. Use HVDLL_VERSION'
//-{$ifend}
;
{$EXTERNALSYM uHVDll}
(*
//# Sample for checking:
//# <sample>
//#
{$ifndef fpc}{$warn comparison_true off}{$endif}
{$if (not declared(HVDLL_VERSION)) or (HVDLL_VERSION < 202401172130)}
{$ifndef fpc}{$warn message_directive on}{$endif}
{$MESSAGE WARN 'Please use latest "HVDll.pas" from "https://github.com/pult/dll_load_delay"'}
// or :
//{$MESSAGE FATAL 'Please use latest "HVDll.pas" from "https://github.com/pult/dll_load_delay"'}
{$ifend}{$warnings on}
//#
//# <\sample>
//*)
type
{$if declared(Exception)}
EDllError = class(Exception);
{$ifend}
PPointer = ^Pointer;
//# Structures to keep the address of function variables and name/id pairs
TEntryEx = record
EProc: PPointer;
DProc: Pointer; //# Reference to dummy when EProc not exists
case Integer of
0: (EName: PChar);
1: (EID : LongInt);
end;
PEntryEx = ^TEntryEx;
TEntry = record
Proc: PPointer;
case Integer of
0: (Name: PChar);
1: (ID : LongInt);
end;
PEntry = ^TEntry;
TEntriesEx = array of TEntryEx;
//# Structures to generate the per-routine thunks
TThunk = packed record
CALL : Byte;
OFFSET: Integer;
end{ align 8};
PThunk = ^TThunk;
TThunks = packed array[0..High(Word)-1] of TThunk;
PThunks = ^TThunks;
//# Structure to generate the per-DLL thunks
TThunkHeader = packed record
{$IFDEF CPUX86}
PUSH : Byte;
VALUE : Pointer;
JMP : Byte;
OFFSET : Integer;
{$ENDIF}
{$IFDEF CPUX64}
OPCODES: packed array[0..10] of Byte; //# push rax; mov rax Self
JMP : Byte;
OFFSET : Integer;
{$ENDIF}
end{ align 8};
PThunkHeader=^TThunkHeader;
//# The combined per-DLL and per-routine thunks
TThunkingCode = packed record
ThunkHeader : TThunkHeader;
Thunks : TThunks;
end{ align 8};
PThunkingCode = ^TThunkingCode;
//# The base class that provides DelayLoad capability
TDll = class
private
FShortName : string;
FCount : Integer;
FHandle : HMODULE;
FDllFinalize : Boolean;
FFullPath : string;
FThunkingCode : PThunkingCode;
FEntries : TEntriesEx;
function GetHandle: HMODULE;
procedure SetFullPath(const Value: string);
function GetProcs(Index: Integer): Pointer;
procedure SetProcs(Index: Integer; Value: Pointer);
function GetAvailable: Boolean;
function GetLoaded: Boolean;
function LoadProcAddrFromIndex(Index: Integer; var Addr: Pointer): Boolean;
procedure ActivateThunks;
function GetEntryName(Index: Integer): string;
protected
function LoadHandle: HMODULE; virtual;
class procedure DoError(const Msg: string; Show: Boolean{ = True}; Warn: Boolean{ = False});
class procedure Error(const Msg: string); {$ifdef allow_inline}inline;{$endif}
class procedure Warning(const Msg: string); {$ifdef allow_inline}inline;{$endif}
procedure CreateThunks;
procedure DestroyThunks;
function HasThunk(Thunk: PThunk): Boolean;
function GetProcAddrFromIndex(Index: Integer): Pointer;
function DelayLoadFromThunk(Thunk: PThunk): Pointer; {$IFDEF WIN32}register;{$ENDIF}
function DelayLoadIndex(Index: Integer): Pointer;
function GetIndexFromThunk(Thunk: PThunk): Integer;
function GetIndexFromProc(Proc: PPointer): Integer;
function ValidIndex(Index: Integer): Boolean;
function CheckIndex(Index: Integer): Boolean; //inline;
property Procs[Index: Integer]: Pointer read GetProcs write SetProcs;
public
constructor Create(const DllName: string; const Entries: array of TEntryEx); overload;
constructor Create(const DllName: string; const Entries: array of TEntry); overload;
destructor Destroy; override;
procedure Load;
procedure Unload;
function HasRoutine(Proc: PPointer): Boolean;
function HookRoutine(Proc: PPointer; HookProc: Pointer; var OrgProc{: Pointer}): Boolean;
function UnHookRoutine(Proc: PPointer; var OrgProc{: Pointer}): Boolean;
property FullPath: string read FFullPath write SetFullPath;
property ShortName: string read FShortName;
//property Handle: HMODULE read GetHandle;
property Loaded: Boolean read GetLoaded;
property Available: Boolean read GetAvailable;
property Count: Integer read FCount;
property EntryName[Index: Integer]: string read GetEntryName;
end;
{$IFDEF _MINI_}
const
MaxListSize = Maxint div 16;
type
TPointerList = array[0..MaxListSize - 1] of Pointer;
PPointerList = ^TPointerList;
TList = class
private
FList : PPointerList;
FCount : Integer;
FCapacity : Integer;
protected
function Get(Index: Integer): Pointer;
procedure Grow; virtual;
procedure Put(Index: Integer; Item: Pointer);
procedure SetCapacity(NewCapacity: Integer);
procedure SetCount(NewCount: Integer);
public
destructor Destroy; override;
function Add(Item: Pointer): Integer;
procedure Clear; virtual;
procedure Delete(Index: Integer);
function IndexOf(Item: Pointer): Integer;
function Remove(Item: Pointer): Integer;
property Count: Integer read FCount write SetCount;
end;
{$ENDIF _MINI_}
// The class that keeps a list of all created TDll instances in one place
TDllNotifyAction = (daLoadedDll, daUnloadedDll, daLinkedRoutine);
TDllNotifyEvent = procedure(Sender: TDll; Action: TDllNotifyAction; Index: Integer) of object;
TDlls = class(TList)
private
FCodeHeap : TCodeHeap;
FOnDllNotify : TDllNotifyEvent;
FDllFinalize : Boolean;
function GetDlls(Index: Integer): TDll;
protected
procedure DllNotify(Sender: TDll; Action: TDllNotifyAction; Index: Integer);
property CodeHeap: TCodeHeap read FCodeHeap;
public
constructor Create;
destructor Destroy; override;
property Dlls[Index: Integer]: TDll read GetDlls; default;
property OnDllNotify: TDllNotifyEvent read FOnDllNotify write FOnDllNotify;
end;
{$IFDEF _MINI_}
function IntToStr(Value: LongInt{DWORD}): string;
function SysErrorMessage(ErrorCode: Cardinal; AModuleHandle: THandle = 0): string;
{$ENDIF _MINI_}
var
Dlls: TDlls;
{$ENDIF SUPPORTED}
implementation
{$IFDEF SUPPORTED}
{$IFDEF VER90}
const
{$ELSE}
resourcestring
{$ENDIF}
SOrdinal = 'ordinal #';
{$IFNDEF _MINI_}
SIndexOutOfRange = 'DLL-entry index out of range (%d)';
SCannotLoadLibrary = 'Could not find the library: "%s"'#13#10'(%s)';
SCannotGetProcAddress = 'Could not find the routine "%s" in the library "%s"'#13#10'(%s)';
//SCannotFindThunk = 'Could not find the TDll object corresponding to the thunk address %p';
{$ELSE}
SIndexOutOfRange = 'DLL-entry index out of range ';
{$ENDIF !_MINI_}
{ Helper routines }
{$IFDEF _MINI_}
function NativeUIntToStrBuf(ANum: NativeUInt; APBuffer: PAnsiChar): Cardinal; //PAnsiChar; // "getmem.inc"
const
MaxDigits = 20;
var
LDigitBuffer: array[0..MaxDigits - 1] of AnsiChar;
LCount: Cardinal; LDigit: NativeUInt;
begin
{Generate the digits in the local buffer}
LCount := 0;
repeat
LDigit := ANum;
ANum := ANum div 10;
{$hints off}
LDigit := LDigit - ANum * 10;
{$hints on}
Inc(LCount);
LDigitBuffer[MaxDigits - LCount] := AnsiChar(Ord('0') + LDigit);
until ANum = 0;
{Copy the digits to the output buffer and advance it}
System.Move(LDigitBuffer[MaxDigits - LCount], APBuffer^, LCount);
//Result := APBuffer + LCount;
Result := LCount;
end;
function IntToStr(Value: LongInt{DWORD}): string;
var S: AnsiString; L: Cardinal;
begin
S := ''; SetLength(S, 10);
L := NativeUIntToStrBuf(Value, PAnsiChar(S));
SetLength(S, L);
Result := string(S);
end;
{$ENDIF _MINI_}
{$warnings off}
function EntryToString(const Entry: TEntryEx): string;
begin
if Hi(Entry.EID) <> 0
then Result := string(Entry.EName)
else Result := SOrdinal+IntToStr(Entry.EID);
end;
{$warnings on}
const TTHUNK_SIZE = SizeOf(TThunk);
(*= EXPERIMENTES: //# @dbg: PUREPASCAL
{$IFDEF CPUX64}
procedure ThunkingTarget(); //#dbg: tobject(RAX).classname
var ADll: TDll; AThunk: PThunk; _RCX{, _ADDR}: Pointer;
function get_self(): TDll; assembler;
asm .NOFRAME
end;
function get_rcx(): TDll; assembler;
asm .NOFRAME
mov rax, rcx
end;
procedure set_rcx(_RDX: Pointer); assembler;
asm .NOFRAME
mov rcx, rdx
end;
procedure pop_rax(); assembler;
asm .NOFRAME
mov rsp,rbp
pop rbp
POP RAX
ret
end;
procedure path_ret_addr; assembler; // RCX = RBP
asm .NOFRAME
// MOV [RBP+$30+{vars:}8*3-16+32], RAX //# Result:Pointer # rax = nativeint(@test_libssh2_init)
MOV [RCX+88], RAX //# Result:Pointer # rax = nativeint(@test_libssh2_init)
end;
procedure do_ret(); assembler;
asm .NOFRAME
//# Return
lea rsp,[rbp+$30+3*8]
pop rbp
ADD RSP, 8 //# Remove the Self Pointer!
//# "Return" to the DLL! # ppointer(RSP)^ = @test_libssh2_init
end;
begin
ADll := get_self();
_RCX := get_rcx();
// ADll := TDll ( pnativeint( 8*7 + nativeint( (nativeint(pointer(@ADll ))-40) ) )^ )
// ;
//-AThunk := PThunk( pnativeint( 8*8 + nativeint( (nativeint(pointer(@AThunk))-32) ) )^ )
//-Dec(AThunk);
//# or:
AThunk := PThunk( pnativeint( 8*8 + nativeint( (nativeint(pointer(@AThunk))-32) ) )^-SizeOf(TThunk) )
;
{_ADDR :=} ADll.DelayLoadFromThunk(AThunk); //# _ADDR == pointer(RAX) = @test_libssh2_init
//# ? Now patch the return address on the stack so that we "return" to the DLL routine
path_ret_addr();
set_rcx(_RCX);
pop_rax();
//# ? Remove the Self Pointer!
//?...
//# ? return
//?...
do_ret();
{$ENDIF CPUX64}
{$IFDEF CPUX86}
procedure ThunkingTarget(ADll: TDll; AThunk: PThunk);
begin
//# X86: tobject(pinteger(EBP+04)^).classname # integer(pointer(@ADll))-integer(ESP+04)
asm add ebp, -4 end;
//?
ADll.DelayLoadFromThunk(AThunk); // nativeint(@ADll) - 1374992
{$ENDIF CPUX86}
end; //=*){=
(*=} //# ASM CODE:
//{$ENDIF}
//# EXPERIMENTES.
{$IFDEF CPUX64} //# *** *** *** CPU X64 *** *** ***
//# RAX == Self == tobject(rax).classname
const SZ_REGS = 8*({vars:}0+{save-regs:}(3+4));
{$IFDEF FPC}
procedure ThunkingTarget; assembler; nostackframe;
asm
{$ELSE}
procedure ThunkingTarget; assembler;
asm .NOFRAME
{$ENDIF}
push rbp
sub rsp, $30+SZ_REGS //# added local vars
mov rbp, rsp
{ Stack layout at this point:
48 [Stack based parameters] //# pnativeint(RSP+48)^
40 [User code RetAdr] //# pnativeint(RSP+40)^ # ppointer(RSP+8*5)^
32 [Thunk Ret-Adr] //# pnativeint(RSP+32)^ # ppointer(RSP+8*4)^
24 [Self] //# pnativeint(RSP+24)^ # ppointer(RSP+8*4)^
16 [RAX] //# pnativeint(RSP+16)^
8 [RDX] //# pnativeint(RSP+08)^
0 [RCX] <-RSP} //# pnativeint(RSP+00)^
//# save regs
//- mov [rbp+$28+8*0], rax //# RAX = Self # tobject(rax).classname
mov [rbp+$28+8*1], rdx
mov [rbp+$28+8*2], rcx
//
mov [rbp+$28+8*3], R8
mov [rbp+$28+8*4], R9
mov [rbp+$28+8*5], R10
mov [rbp+$28+8*6], R11
//# Self:TDll # tobject(rax).classname
//- mov rax, [rbp+$38+SZ_REGS] //# Self:TDll
mov [rbp+$28+SZ_REGS], rax //# Self:TDll
//# PThunk( pnativeint( 8*8 + nativeint( (nativeint(pointer(@AThunk))-32) ) )^-SizeOf(TThunk) )^
//# PThunk(pnativeint(rbp+8*8+SZ_REGS)^-SizeOf(TThunk))^
mov rax, [rbp+8*8+SZ_REGS] //# PThunk
lea rax, [rax-TTHUNK_SIZE] //# The return address is just after the thunk that called us, so go back one step
mov [rbp+$20+SZ_REGS], rax //# PThunk(rax)^
//# CALL TDll.DelayLoadFromThunk (RCX:Sell:TDll, RDX:PThunk)
mov rcx, [rbp+$28+SZ_REGS] //# Self:TDll # Get the caller's return address (i.e. one of the thunks)
mov rdx, [rbp+$20+SZ_REGS] //# TThunk
//# Do the rest in Pascal
CALL TDll.DelayLoadFromThunk //# Changed: RCX,RDX,R8,R9,R10,R11
//# Now patch the return address on the stack so that we "return" to the DLL routine
MOV [RBP+$30+SZ_REGS-16+32], RAX //# Result:Pointer # rax = nativeint(@test_libssh2_init)
//# restore regs
mov R11, [rbp+$28+8*6]
mov R10, [rbp+$28+8*5]
mov R9, [rbp+$28+8*4]
mov R8, [rbp+$28+8*3]
//
mov rcx, [rbp+$28+8*2]
mov rdx, [rbp+$28+8*1]
//- mov rax, [rbp+$28+8*0]
//
pop rax
//# Return
lea rsp,[rbp+$30+SZ_REGS]
pop rbp
ADD RSP, 8 //# Remove the Self Pointer!
//# "Return" to the DLL! # ppointer(RSP)^ = @test_libssh2_init
//{$IFDEF DEBUG}ret{$ENDIF}
end;
{$ENDIF CPUX64}
{$IFDEF CPUX86} //# *** *** *** CPU X86 *** *** ***
procedure ThunkingTarget; assembler;
asm
//# Save register-based parameters
PUSH EAX
PUSH EDX
PUSH ECX
{ Stack layout at this point:
24 [Stack based parameters] //# pinteger(ESP+24)^
20 [User code RetAdr] //# ppointer(ESP+20)^ ppointer(ESP+4*5)^
16 [Thunk Ret-Adr] //# ppointer(ESP+16)^ ppointer(ESP+4*4)^
12 [Self] //# ppointer(ESP+12)^
8 [EAX] //# pinteger(ESP+08)^
4 [EDX] //# pinteger(ESP+04)^
0 [ECX] <-ESP} //# pinteger(ESP+00)^
//# Get the caller's return address (i.e. one of the thunks)
MOV EAX, [ESP+12] // Self
MOV EDX, [ESP+16] // Thunk
//# The return address is just after the thunk that called us, so go back one step
SUB EDX, TYPE TThunk // Using SizeOf(TThunk) here does not work. BASM not supported it(old bug)! # TTHUNK_SIZE
//# Do the rest in Pascal
CALL TDll.DelayLoadFromThunk //#(EAX:Self:TDll, EDX:Thunk) #@dbg: tobject(EAX).classname # PThunk(EAX)^
//# Now patch the return address on the stack so that we "return" to the DLL routine
MOV [ESP+16], EAX //# pointer(EAX)
// Restore register-based parameters
POP ECX
POP EDX
POP EAX
//# Remove the Self Pointer!
ADD ESP, 4
//# "Return" to the DLL!
//{$IFDEF DEBUG}ret{$ENDIF}
end;
{$ENDIF CPUX86}
//*)
{$if declared(ThunkingTarget)}
{$IFDEF _DCC_MSG_}
{$MESSAGE '# Note: NHVDll is supported!!"'}
{$ENDIF}
{$else}
{$IFDEF _DCC_MSG_}
{$MESSAGE FATAL 'ERROR: NHVDll: ThunkingTarget : platform not supported'}
{$ELSE}
ERROR = 'NHVDll: ThunkingTarget : platform not supported!'
{$ENDIF}
{$ifend}
//
//{$IFNDEF FPC}
// {$IFNDEF _OPT_DEBUG_OFF_}
// {$D+} // FPC: Warning: Misplaced global compiler switch, ignored
// {$ENDIF}
//{$ENDIF FPC}
{ TDll }
constructor TDll.Create(const DllName: string; const Entries: array of TEntryEx);
var i: Integer;
begin
inherited Create;
SetFullPath(DllName);
FCount := Length(Entries);
if FCount > 0 then begin
SetLength(FEntries, FCount);
for i := 0 to High(Entries) do begin
FEntries[i] := Entries[i];
end;
CreateThunks;
ActivateThunks;
end;
Dlls.Add(Self);
end;
constructor TDll.Create(const DllName: string; const Entries: array of TEntry);
var i: Integer; L: PEntryEx; R: PEntry;
begin
inherited Create;
SetFullPath(DllName);
FCount := Length(Entries);
if FCount > 0 then begin
SetLength(FEntries, FCount);
L := @FEntries[0];
R := @Entries[0];
for i := High(Entries) downto 0 do begin //# FEntries[i]: EProc := Entries[i].Proc; EID := Entries[i].ID; EName := Entries[i].Name;
L^.EProc := R^.Proc;
L^.EID := R^.ID;
L^.EName := R^.Name;
Inc(L);
Inc(R);
end;
CreateThunks;
ActivateThunks;
end;
Dlls.Add(Self);
end;
destructor TDll.Destroy;
var i: Integer;
begin
//-if Assigned(Dlls) then
begin
i := Dlls.IndexOf(Self);
if i >= 0
then Dlls.Delete(i)
else TDll.DoError('"'+FShortName+'": - Failed owned', {Show:}False, {Warn:}False);
end;
Unload;
DestroyThunks;
inherited Destroy;
end;
procedure TDll.CreateThunks;
const
CallInstruction = $E8;
PushInstruction = $68;
JumpInstruction = $E9;
var
i: Integer; Size: DWORD; H: PThunkHeader; T, T1: PThunk;
{$IFDEF CPUX64}
C: PByte;
{$ENDIF}
begin
if Count = 0 then
Exit;
// Get a memory block large enough for the thunks
Size := SizeOf(TThunkHeader) + SizeOf(TThunk) * Cardinal(Count);
Dlls.CodeHeap.GetMem(FThunkingCode, Size);
//# Generate some machine code in the thunks
begin
//# The per-Dll thunk does this:
//# PUSH Self
//# JMP ThunkingTarget
H := @FThunkingCode^.ThunkHeader;
{$IFDEF CPUX86}
//FillChar(FThunkingCode^, Size, #0);
H^.PUSH := PushInstruction;
H^.VALUE := Self;
{$ENDIF}
{$IFDEF CPUX64}
with H^ do begin
C := @OPCODES[0];
//FillChar(C^, Length(OPCODES), $90); //# nop
//# push rax
C^ := $50; inc(C);
//# mov rax, Self
C^ := $48; inc(C); C^ := $B8; inc(C);
PPointer(C)^ := Self; //inc(C, SizeOf(Pointer));
end;
{$ENDIF}
//# jmp FThunkingCode
H^.JMP := JumpInstruction;
T := @FThunkingCode^.Thunks[0];
H^.OFFSET := PAnsiChar(@ThunkingTarget) - PAnsiChar(T);
T1 := T; Inc(T1);
for i := 0 to Count-1 do begin //# T == @FThunkingCode^.Thunks[i] # T1 == @FThunkingCode^.Thunks[i+1]
//# The per-entry thunk does this:
//# CALL @ThunkingCode^.ThunkHeader
T^.CALL := CallInstruction;
T^.OFFSET := PAnsiChar(H) - PAnsiChar(T1);
//
Inc(T); Inc(T1);
end;
end;
end;
procedure TDll.DestroyThunks;
var P: Pointer;
begin
if Assigned(FThunkingCode) then begin
P := FThunkingCode; FThunkingCode := nil;
if not Dlls.CodeHeap.FreeMem(P) then
TDll.DoError('"'+FShortName+'": - Failed FreeMem', {Show:}False, {Warn:}False);
end;
end;
//#TEST:
{$if defined(_IDE_) and defined(_DEBUG_) and defined(_TEST_)}
//{ //# optional:
type t_libssh2_init = function(flags: Integer): Integer; cdecl;
var _test_libssh2_init: t_libssh2_init;
function test_libssh2_init(flags: Integer): Integer; cdecl;
begin
Result := _test_libssh2_init(flags);
end;
type t_libssh2_exit = procedure; cdecl;
var _test_libssh2_exit: t_libssh2_exit;
procedure test_libssh2_exit; cdecl;
begin
_test_libssh2_exit();
end;
//}
{$ifend}
//#TEST.
function TDll.DelayLoadFromThunk(Thunk: PThunk): Pointer;
//begin Result := DelayLoadIndex(GetIndexFromThunk(Thunk)); end; (*
var i: integer;
begin //@dbg: Thunk^ ,r
if FDllFinalize then
TDll.Error('Module HVDll uninitialized');
i := GetIndexFromThunk(Thunk); //@dbg: FEntries[i].EName
Result := DelayLoadIndex(i);
//#TEST:
{$if defined(_IDE_) and defined(_DEBUG_) and defined(_TEST_)}
if Assigned(Result) then begin
if (FEntries[i].EName = 'libssh2_init') then begin
@_test_libssh2_init := Result;
Result := @test_libssh2_init; //#TODO: For TEST only: Failed thunk clear memory access for 'libssh2_init'
FEntries[i].EProc := Result;
end else if (FEntries[i].EName = 'libssh2_exit') then begin
@_test_libssh2_exit := Result;
Result := @test_libssh2_exit;
FEntries[i].EProc := Result;
end;
end;
{$ifend}
//#TEST.
end;//*)
function TDll.DelayLoadIndex(Index: Integer): Pointer;
begin
Result := GetProcAddrFromIndex(Index);
if Assigned(Result)
then FEntries[Index].EProc^ := Result
else FEntries[Index].EProc^ := FEntries[Index].DProc;
end;
class procedure TDll.DoError(const Msg: string; Show: Boolean; Warn: Boolean);
{$IFDEF _MINI_}
{$if (not declared(EDllError)) and (not declared(Abort))}
var uType: Cardinal;
{$ifend}
{$ENDIF}
begin
{$IFDEF UNICODE}
OutputDebugStringW(PWideChar(UnicodeString('ERROR: TDll: ' + Msg)));
{$ELSE}
OutputDebugStringA(PAnsiChar(AnsiString('ERROR: TDll: ' + Msg)));
{$ENDIF}
if IsConsole and Show then
begin
writeln('ERROR: ', Msg);
end;
{$IFNDEF _MINI_}
if Show then
raise EDllError.Create(Msg);
{$ELSE _MINI_}
if Show then
begin
{$if declared(EDllError)}
raise EDllError.Create(Msg);
{$else}
{$if declared(Abort)}
Abort;
{$else}
uType := MB_OK;
if Warn
then uType := uType or MB_ICONWARNING
else uType := uType or MB_ICONERROR;
{$IFDEF UNICODE}
MessageBoxW(0, PWideChar(UnicodeString(Msg)), nil, uType);
{$ELSE}
MessageBoxA(0, PAnsiChar(AnsiString(Msg)), nil, uType);
{$ENDIF}
Halt(1);
{$ifend}
{$ifend}
end;
{$ENDIF _MINI_}
end;
class procedure TDll.Error(const Msg: string);
begin
TDll.DoError(Msg, {Show:}True, {Warn:}False);
end;
class procedure TDll.Warning(const Msg: string);
begin
TDll.DoError(Msg, {Show:}False, {Warn:}True);
end;
function TDll.LoadHandle: HMODULE;
begin
if FHandle = 0 then begin
{$if declared(SafeLoadLibrary)}
FHandle := SafeLoadLibrary(FullPath);
{$else}
FHandle := Windows.LoadLibrary(PChar(FullPath));
{$ifend}
if FHandle <> 0 then
Dlls.DllNotify(Self, daLoadedDll, -1);
end;
Result := FHandle;
end;
{$IFDEF _MINI_}
{$hints off}
function SysErrorMessage(ErrorCode: Cardinal; AModuleHandle: THandle = 0): string;
var Len: Cardinal; Flags: DWORD;
Buffer: {$IFDEF UNICODE}PWideChar{$ELSE}PAnsiChar{$ENDIF};
U: {$IFDEF UNICODE}UnicodeString{$ELSE}AnsiString{$ENDIF};
begin
Flags := FORMAT_MESSAGE_FROM_SYSTEM or
FORMAT_MESSAGE_IGNORE_INSERTS or
FORMAT_MESSAGE_ARGUMENT_ARRAY or
FORMAT_MESSAGE_ALLOCATE_BUFFER;
if AModuleHandle <> 0 then
Flags := Flags or FORMAT_MESSAGE_FROM_HMODULE;
//# Obtain the formatted message for the given Win32 ErrorCode
//# Let the OS initialize the Buffer variable. Need to LocalFree it afterward.
{$IFDEF UNICODE}
Len := FormatMessageW(Flags, Pointer(AModuleHandle), ErrorCode, 0, @Buffer, 0, nil);
{$ELSE}
Len := FormatMessageA(Flags, Pointer(AModuleHandle), ErrorCode, 0, @Buffer, 0, nil);
{$ENDIF};
try
//# Remove the undesired line breaks and '.' char
{$IFDEF UNICODE}
while (Len > 0) and ((Buffer[Len - 1] <= WideChar(#32)) or (Buffer[Len - 1] = WideChar('.'))) do begin
{$ELSE}
while (Len > 0) and ((Buffer[Len - 1] <= AnsiChar(#32)) or (Buffer[Len - 1] = AnsiChar('.'))) do begin
{$ENDIF}
Dec(Len);
end;
//# Convert to Delphi string
SetString(U, Buffer, Len);
Result := string(U);
finally
//# Free the OS allocated memory block
LocalFree(HLOCAL(Buffer));
end;
end;
{$hints on}
{$ENDIF _MINI_}
function TDll.GetHandle: HMODULE;
begin
Result := FHandle;
if Result = 0 then begin
Result := LoadHandle();
if Result = 0 then
{$IFNDEF _MINI_}
TDll.Error(Format(SCannotLoadLibrary, [FullPath, SysErrorMessage(GetLastError)]));
{$ELSE}
TDll.Error(
'Could not find the library: "' + FullPath + '"'#13#10'(' + SysErrorMessage(GetLastError()) + ')'
);
{$ENDIF _MINI_}
end;
end;
function TDll.GetIndexFromThunk(Thunk: PThunk): Integer;
begin
//# We calculate the thunk index by subtracting the start of the array
//# and dividing by the size of the array elements
Result := (PAnsiChar(Thunk) - PAnsiChar(@FThunkingCode^.Thunks[0])) div SizeOf(TThunk);
end;
function TDll.LoadProcAddrFromIndex(Index: Integer; var Addr: Pointer): Boolean;
var H: HMODULE;
begin
Result := ValidIndex(Index);
if Result then begin
H := GetHandle();
Result := H <> 0;
if Result then begin
Addr := Windows.GetProcAddress(H, FEntries[Index].EName);
Result := Assigned(Addr);
if not Result then begin