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{
FPC Utility Functions for Native NT applications
This file is part of the Free Pascal run time library.
Copyright (c) 2009 by Sven Barth
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
unit NDKUtils;
{$mode objfpc}{$H+}
interface
uses
NDK;
// Helpers for converting Pascal string types to NT's UNICODE_STRING
procedure ShortStrToNTStr(aStr: ShortString; var aNTStr: UNICODE_STRING);
procedure AnsiStrToNTStr(const aStr: String; var aNTStr: UNICODE_STRING);
procedure UnicodeStrToNtStr(const aStr: UnicodeString;
var aNTStr: UNICODE_STRING);
procedure PCharToNTStr(aStr: PChar; aLen: Cardinal; var aNTStr: UNICODE_STRING);
procedure FreeNTStr(var aNTStr: UNICODE_STRING);
// Wraps NtDisplayString for use with Write(Ln)
procedure AssignDisplayString(var aFile: Text; aUtf8: Boolean);
implementation
uses
SysUtils;
procedure ShortStrToNTStr(aStr: ShortString; var aNTStr: UNICODE_STRING);
var
buf: Pointer;
i: Integer;
begin
aNTStr.Length := Length(aStr) * 2;
aNTStr.buffer := GetMem(aNTStr.Length);
buf := aNTStr.buffer;
for i := 1 to Length(aStr) do begin
PWord(buf)^ := Word(aStr[i]);
buf := Pointer(PtrUInt(buf) + SizeOf(Word));
end;
aNTStr.MaximumLength := aNTStr.Length;
end;
procedure AnsiStrToNTStr(const aStr: String; var aNTStr: UNICODE_STRING);
var
buf: PWideChar;
i: Integer;
begin
aNTStr.Length := Length(aStr) * 2;
aNTStr.Buffer := GetMem(aNTStr.Length);
buf := aNTStr.buffer;
for i := 1 to Length(aStr) do begin
buf^ := WideChar(Word(aStr[i]));
Inc(buf);
end;
aNTStr.MaximumLength := aNTStr.Length;
end;
procedure UnicodeStrToNtStr(const aStr: UnicodeString;
var aNTStr: UNICODE_STRING);
var
buf: PWideChar;
begin
{ TODO : check why this prints garbage }
aNTStr.Length := Length(aStr) * 2;
aNTStr.Buffer := GetMem(aNTStr.Length);
if Length(aStr) > 0 then
Move(aStr[1], aNTStr.Buffer^, aNTStr.Length);
aNTStr.MaximumLength := aNTStr.Length;
end;
procedure PCharToNTStr(aStr: PChar; aLen: Cardinal; var aNTStr: UNICODE_STRING);
var
i: Integer;
begin
if (aLen = 0) and (aStr <> Nil) and (aStr^ <> #0) then
aLen := StrLen(aStr);
aNtStr.Length := aLen * SizeOf(WideChar);
aNtStr.MaximumLength := aNtStr.Length;
aNtStr.Buffer := GetMem(aNtStr.Length);
for i := 0 to aLen do
aNtStr.Buffer[i] := aStr[i];
end;
procedure FreeNTStr(var aNTStr: UNICODE_STRING);
begin
if aNTStr.Buffer <> Nil then
FreeMem(aNTStr.Buffer);
FillChar(aNTStr, SizeOf(UNICODE_STRING), 0);
end;
function DisplayStringWriteFunc(var aFile: TTextRec ): LongInt;
var
ntstr: TNtUnicodeString;
len: SizeUInt;
begin
Result := 0;
with aFile do
if (BufPos>0) then begin
if Boolean(UserData[1]) then begin
{ TODO : check why UTF8 prints garbage }
{len := Utf8ToUnicode(Nil, 0, PChar(BufPtr), BufPos);
ntstr.Length := len * 2;
ntstr.MaximumLength := ntstr.Length;
ntstr.Buffer := GetMem(ntstr.Length);
Utf8ToUnicode(ntstr.Buffer, len, PChar(BufPtr), BufPos);}
PCharToNtStr(PChar(BufPtr), BufPos, ntstr);
end else
PCharToNtStr(PChar(BufPtr), BufPos, ntstr);
NtDisplayString(@ntstr);
// FreeNTStr uses FreeMem, so we don't need an If here
FreeNtStr(ntstr);
BufPos := 0;
end;
end;
function DisplayStringCloseFunc(var aFile: TTextRec): LongInt;
begin
Result := 0;
end;
function DisplayStringOpenFunc(var aFile: TTextRec ): LongInt;
begin
Result := 0;
end;
procedure AssignDisplayString(var aFile: Text; aUtf8: Boolean);
begin
FillChar(aFile, SizeOf(TextRec), 0);
{ only set things that are not zero }
TextRec(aFile).Handle := UnusedHandle;
TextRec(aFile).mode := fmOutput;
TextRec(aFile).BufSize := TextRecBufSize;
TextRec(aFile).Bufptr := @TextRec(aFile).Buffer;
TextRec(aFile).OpenFunc := @DisplayStringOpenFunc;
case DefaultTextLineBreakStyle of
tlbsLF:
TextRec(aFile).LineEnd := #10;
tlbsCRLF:
TextRec(aFile).LineEnd := #13#10;
tlbsCR:
TextRec(aFile).LineEnd := #13;
end;
TextRec(aFile).Closefunc := @DisplayStringCloseFunc;
TextRec(aFile).InOutFunc := @DisplayStringWriteFunc;
TextRec(aFile).FlushFunc := @DisplayStringWriteFunc;
TextRec(aFile).UserData[1] := Ord(aUTF8);
end;
end.
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