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| unit Steganos;
interface
uses Classes, Windows, Dialogs, SysUtils, Forms, JPEG, Graphics;
type
TImageFileInfo=record
FileN:String; //Èìÿ bmp’øêè
width:dword; //øèðèíà ðèñóíêà
height:dword; //âûñîòà ðèñóíêà
smeshenie:dword; //Ñìåùåíèå ðèñóíêà îò íà÷àëà ôàéëà
FileSize:dword; //Ðàçìåð bmp’øêè
ImageSize:dword; //Ðàçìåð ðèñóíêà
InfoHide:dword; //Ñêîëüêî èíôû ìîæíî ñïðÿòàòü
RLE:byte; //Óðîâåíü ñæàòèÿ - äîëæåí áûòü ðàâåí 0
BitsPerPixel:byte; //Ðàçðÿäíîñòü ðèñóíêà (áèò íà ïèêñåëü) - íàì íóæíû 24-õ ðàçðÿäíûå
Signature:string[2]; //Ïåðâûå äâà áàéòà ôàéëà - bmp-ôàéëîâ äîëæíû áûòü 'BM'
end;
BitsArray=array[0..7] of byte;
function FileType(FileN:string):string;
procedure ConvertJPG2BMP(JPGName, BMPName:string);
procedure GetFileFormat(FileN:string;var StrLst:TStringList;var ImageInfo:TImageFileInfo);
procedure IHide(ImageInfo:TImageFileInfo; DFile:string; SaveDialog:TSaveDialog; cb:byte);
procedure IExtract(IFile:string;SaveDialog:TSaveDialog; cb:byte);
implementation
function FileType(FileN:string):string;
var st:TMemoryStream;
str:string[3];
i:integer;
begin
st:=TMemoryStream.Create;
st.LoadFromFile(FileN);
str:=' ';
for i:=1 to 3 do
st.ReadBuffer(str[i], sizeof(str[i]));
if copy(str, 1,2) = 'BM'
then Result:='BMP'
else if str = 'ÿØÿ'
then Result:='JPG'
else Result:='???';
st.Free;
end;
procedure ConvertJPG2BMP(JPGName, BMPName:string);
var
jpg:TJPEGImage;
bmp:TBitmap;
begin
try
jpg:=TJPEGImage.Create;
bmp:=TBitmap.Create;
jpg.CompressionQuality:=100;
jpg.Compress;
jpg.LoadFromFile(JPGName);
bmp.Assign(jpg);
bmp.SaveToFile(BMPName);
FreeAndNil(jpg);
FreeAndNil(bmp);
except
on e:Exception do
begin
FreeAndNil(jpg);
FreeAndNil(bmp);
end;
end;
end;
procedure GetFileFormat(FileN:string;var StrLst:TStringList;var ImageInfo:TImageFileInfo);
var
Stream:TMemoryStream;
ch:char;
size,dwrd:dword;
wrd:word;
// bt:byte;
str:string;
begin
StrLst:=TStringList.Create;
stream:=TMemoryStream.Create;
stream.LoadFromFile(FileN); //Çàãðóæàåì bmp’øêó â òîëüêî ÷òî ñîçäàííûé MemoryStream
StrLst.Add(' ***Òåõíè÷åñêàÿ èíôîðìàöèÿ î ôàéëå*** ');
StrLst.Add(' ***Ôàéë èçîáðàæåíèÿ: '+FileN+'***');
stream.Read(ch,sizeof(ch)); //×èòàåì ñèãíàòóðó
str:=ch;
stream.Read(ch,sizeof(ch));
str:=str+ch;
StrLst.Add(' ***********');
ImageInfo.Signature:=str; //Çàíåñåì â çàïèñü ñèãíàòóðó
if ImageInfo.Signature ='BM' then //Åñëè ñèãíàòóðà = ‘BM’, òî çíà÷èò âñå íîðìàëüíî - ïðîäîëæàåì
begin
ImageInfo.FileN:=ExpandFileName(FileN); //Çàíåñåì â çàïèñü èìÿ bmp’øêè
stream.Read(dwrd,sizeof(dwrd)); //Ñ÷èòàåì èç çàãîëîâêà ðàçìåð ôàéëà
ImageInfo.Filesize:=dwrd;
size:=round(dwrd/1024); //Ïåðåâåäåì â êèëîáàéòû äëÿ äàëüíåéøåãî âûâîäà â îïèñàíèå
StrLst.add('Ðàçìåð ôàéëà ñ èçîáðàæåíèåì: '+IntToStr(dwrd)+' ( '+InTToStr(size)+' kb)');
stream.Read(dwrd,sizeof(dwrd)); //Çàðåçåðâèðîâàíî - íå èñïîëüçóåòñÿ
stream.Read(dwrd,sizeof(dwrd)); //Çàðåçåðâèðîâàíî - íå èñïîëüçóåòñÿ
ImageInfo.smeshenie:=dwrd; //Åñëè ÷òî-òî äàëåå íå ÿñíî - ñìîòðè îïèñàíèå ôîðìàòà
StrLst.Add('Ñìåùåíèå äàííûõ áèòîâîãî îáðàçà îò çàãîëîâêà: '+IntToStr(dwrd)+' áàéò');
stream.Read(dwrd,sizeof(dwrd));
StrLst.Add('Ðàçìåð BITMAPINFOHEADER: '+IntToStr(dwrd)+' áàéò');
stream.Read(dwrd,sizeof(dwrd));
ImageInfo.width:=dwrd;
StrLst.Add('Øèðèíà èçîáðàæåíèÿ: '+IntToStr(dwrd)+' ïèêñåëåé');
stream.Read(dwrd,sizeof(dwrd));
ImageInfo.height:=dwrd;
StrLst.Add('Âûñîòà èçîáðàæåíèÿ: '+IntToStr(dwrd)+' ïèêñåëåé');
stream.Read(wrd,sizeof(wrd));
StrLst.Add('×èñëî áèòîâûõ ïëîñêîñòåé óñòðîéñòâà: '+IntToStr(wrd));
stream.Read(wrd,sizeof(wrd));
ImageInfo.BitsPerPixel:=wrd;
StrLst.Add('Ãëóáèíà èçîáðàæåíèÿ (÷èñëî áèòîâ íà ïèêñåëü): '+IntToStr(wrd));
stream.Read(dwrd,sizeof(dwrd));
StrLst.Add('Òèï ñæàòèÿ (0-îòñóòñòâóåò): '+IntToStr(dwrd));
ImageInfo.RLE:=dwrd;
stream.Read(dwrd,sizeof(dwrd));
size:=round(dwrd/(1024));
StrLst.Add('Ðàçìåð êàðòèíêè â áàéòàõ: '+IntToStr(dwrd)+' ( '+IntToStr(size)+' kb)');
ImageInfo.ImageSize:=dwrd;
stream.Read(dwrd,sizeof(dwrd));
StrLst.Add('Ãîðèçîíòàëüíîå ðàçðåøåíèå óñòðîéñòâà (ïèêñåëü/ì): '+IntToStr(dwrd));
stream.Read(dwrd,sizeof(dwrd));
StrLst.Add('Âåðòèêàëüíîå ðàçðåøåíèå óñòðîéñòâà (ïèêñåëü/ì): '+IntToStr(dwrd));
stream.Read(dwrd,sizeof(dwrd));
StrLst.Add('×èñëî èñïîëüçóåìûõ öâåòîâ: '+IntToStr(dwrd));
stream.Read(dwrd,sizeof(dwrd));
StrLst.Add('×èñëî âàæíûõ öâåòîâ: '+IntToStr(dwrd));
ImageInfo.InfoHide:=(ImageInfo.width*ImageInfo.height*3) div 8;
StrLst.Add(' ***********');
StrLst.Add('Ìîæíî ñïðÿòàòü èíôîðìàöèè '+IntToStr(ImageInfo.infohide)+'áàéò ('+IntToStr(round((ImageInfo.infohide)/1024))+'kb)');
end
else StrLst.Add('Îøèáêà: ýòî íå ôàéë ôîðìàòà Windows 3.11 BMP.');
stream.Free;
end;
procedure HexToBin(x:byte;var a:BitsArray);
var
bit,i:byte;
begin
for i:=7 downto 0 do
begin
if (X and (1 shl i))<>0
then bit:=1
else bit:=0;
a[i]:=bit;
end;
end;
procedure BinToHex(var x:byte;a:BitsArray);
var i:dword;
bit,t:byte;
begin
x:=0;
for i:=7 downto 0 do
begin
bit:=a[i];
x:=x or bit;
if i<>0
then x:=x shl 1;
end;
end;
function SetBit(SByte: byte; num: byte): byte;
begin
Result := SByte or (1 shl num);
end;
function ResetBit(SByte: byte; num: byte): byte;
begin
Result := SByte and not (1 shl num);
end;
procedure IHide(ImageInfo:TImageFileInfo; DFile:string; SaveDialog:TSaveDialog; cb:byte);
var
sz,n,z:dword;
len,v,i,xi,xd:byte;
FIStream,FDStream:TMemoryStream;
BAr,BArLog:BitsArray;
tmp,FName:string;
f:File;
filesize:longint;
begin
//Â FDStream ïîäãðóæàåòñÿ ôàéë äàííûõ, à â FIStream ôàéë-êîíòåéíåð
FDStream:=TMemoryStream.Create;
FDStream.LoadFromFile(DFile);
FIStream:=TMemoryStream.Create;
//Òóò èäóò ðàçëè÷íûå ïðîâåðêè íà òî ïîäõîäèò ýòîò ôàéë íà ðîëü êîíòåéíåðà èëè íåò
if ImageInfo.Signature<>'BM' then
begin
MessageBox(Application.handle,'Ýòî íå èçîáðàæåíèå ôîðìàòà Windows Bitmap.','Error',MB_ICONERROR);
exit;
end;
if ImageInfo.BitsPerPixel<>24 then
begin
MessageBox(Application.handle,'Èçîáðàæåíèå äîëæíî áûòü 24-õ áèòíûì!','Error',MB_ICONERROR);
exit;
end;
if ImageInfo.RLE<>0 then
begin
MessageBox(Application.handle,'Â äàííîì èçîáðàæåíèè èñïîëüçóåòñÿ ñæàòèå.','Error',MB_ICONERROR);
exit;
end;
if (ImageInfo.InfoHide < FDStream.Size) then
begin
MessageBox(Application.handle,'Ýòî èçîáðàæåíèå ñëèøêîì ìàëî, ÷òîá ïîìåñòèòü â ñåáÿ ñòîëüêî èíôîðìàöèè.','Error',MB_ICONERROR);
exit;
end;
//Åñëè ôàéë ïðîøåë âñå ïðîâåðêè - ïîäãðóæàåì åãî â ïàìÿòü
FIStream.LoadFromFile(ImageInfo.FileN);
FIStream.Position:=ImageInfo.smeshenie;
//Ðàçìåð ôàéëà äàííûõ ïîìåùàåì â sz
sz:=FDStream.size;
//Çàïèñûâàåì ðàçìåð ôàéëà êîòîðûé ïðÿ÷åì â bmp’øêó
for n:=31 downto 0 do
begin
//×èòàåì áàéò èç ôàéëà-êîíòåéíåðà
FIStream.Read(xi,sizeof(xi));
//Åñëè â sz’å áèò ñ íîìåðîì n ðàâåí 1, òî óñòàíàâëèâàåì 0-îé áèò â òîëüêî ÷òî ñ÷èòàíîì
//áàéòå, íó à åñëè n’íûé áèò ñáðîøåí, òî ñáðàñûâàåì 0-îé áèò…
if (sz and (1 shl n))<>0
then xi:=SetBit(xi,cb)
else xi:=ResetBit(xi,cb);
//Îòêàòûâàåìñÿ íà ïîçèöèþ íàçàä, ÷òîá ïåðåçàïèñàòü òîò áèò êîòîðûé ìû ñ÷èòàëè, íî
//òîëüêî òåïåðü ñ èçìåíåííûì íóëåâûì áèòîì
FIStream.Position:=FIStream.Position-1;
FIStream.Write(xi,sizeof(xi));
end;
//Ïîëó÷àåì èìÿ ôàéëà äàííûõ áåç ïóòè ê ôàéëó
tmp:=ExtractFileName(DFile);
//Ïîëó÷àåì äëèííó èìåíè
len:=Length(tmp);
//Ðàçáèâàåì áàéò â êîòîðîì õðàíèòñÿ äëèííà èìåíè íà ìàññèâ 1 è 0
HexToBin(len,BAr);
//Çàïèñûâàåì äëèííó èìåíè â ôàéë-êîíòåéíåð
for n:=7 downto 0 do
begin
FIStream.Read(xi,sizeof(xi));
if BAr[n]=1 then xi:=SetBit(xi,cb);
if BAr[n]=0 then xi:=ResetBit(xi,cb);
FIStream.Position:=FIStream.Position-1;
FIStream.Write(xi,sizeof(xi));
end;
//Çàïèñûâàåì ñàìî èìÿ ôàéëà â bmp’øêó
for n:=1 to len do
begin
//Áåðåì ñèìâîë ñ íîìåðîì n, ïîëó÷àåì åãî ascii-êîä, ðàçáèâàåì ïîëó÷åííîå íà áèòû è //çàïèñûâàåì
v:=ord(tmp[n]);
HexToBin(v,BAr);
for i:=7 downto 0 do
begin
FIStream.Read(xi,sizeof(xi));
if BAr[i]=1 then xi:=SetBit(xi,cb);
if BAr[i]=0 then xi:=ResetBit(xi,cb);
FIStream.Position:=FIStream.Position-1;
FIStream.Write(xi,sizeof(xi));
end;
end;
//Ïèøåì â bmp’øêó ñàìî òåëî ôàéëà
//êàæäûé áàéò ðàçáèâàåì íà áèòû è çàïèñûâàåì
for n:=0 to (sz-1) do
begin
FDStream.Read(xd,sizeof(xd));
HexToBin(xd,BAr);
for i:=7 downto 0 do
begin
FIStream.Read(xi,sizeof(xi));
if BAr[i]=1 then xi:=SetBit(xi,cb);
if BAr[i]=0 then xi:=ResetBit(xi,cb);
FIStream.Position:=FIStream.Position-1;
FIStream.Write(xi,sizeof(xi));
end;
end;
SetLength(FName,0);
//Âûçûâàåì.. íåò, íå äóõîâ, à äèàëîã ñîõðàíåíèÿ ôàéëîâ
if SaveDialog.Execute then FName:=SaveDialog.FileName;
if LowerCase(ExtractFileExt(FName))<>'.bmp' then FName:=FName + '.bmp';
//Ñîõðàíÿåì
FIStream.SaveToFile(FName);
//Îñâîáîæäàåì ïåðåìåííûå
FDStream.Free;
FIStream.Free;
ShowMessage('Âûïîëíåíî!');
end;
procedure IExtract(IFile:string;SaveDialog:TSaveDialog; cb:byte);
var
IInfo:TImageFileInfo;
Lst:TStringList;
IFstream,DFStream:TMemoryStream;
n,i,sz:dword;
a:BitsArray;
b:array[0..31] of byte;
bit,len,x,z:byte;
DFile:string;
begin
Lst:=TStringList.Create;
//Ïîëó÷àåì èíôó èç bmp’øêè
GetFileFormat(IFile,Lst,IInfo);
//Ãðóçèì âñå â ïàìÿòü
IFstream:=TMemoryStream.Create;
DFStream:=TMemoryStream.Create;
IFstream.LoadFromFile(IFile);
IFstream.Position:=IInfo.smeshenie;
//Ñîáèðàåì ìàññèâ èç 1 è 0, êîòîðûé åñòü ðàçìåð ñïðÿòàííîãî ôàéëà
for n:=31 downto 0 do
begin
IFstream.Read(z,sizeof(z));
if (z and (1 shl cb))<>0 then z:=1 else z:=0;
b[n]:=z;
end;
sz:=0;
//Ñîáèðàåì dword ïî áèòàì èç ìàññèâà ïîëó÷åííãî âûøå
for i:=31 downto 0 do
begin
bit:=b[i];
sz:=sz or bit;
if i<>0 then sz:=sz shl 1;
end;
SetLength(DFile,0);
DFIle:='';
z:=0;
//Ïîëó÷àåì èç ôàéëà-êîíòåéíåðà äëèííó èìåíè
for n:=7 downto 0 do
begin
IFstream.Read(z,sizeof(z));
if (z and (1 shl cb))<>0 then z:=1 else z:=0;
a[n]:=z;
end;
len:=0;
//Ìàññèâ 1 è 0->áàéò
BinToHex(len,a);
//Ïîëó÷àåì èìÿ ñïðÿòàííîãî ôàéëà
for n:=1 to len do
begin
for i:=7 downto 0 do
begin
IFstream.Read(z,sizeof(z)); // Error!
if (z and (1 shl cb))<>0 then z:=1 else z:=0;
a[i]:=z;
end;
BinToHex(z,a);
DFile:=Dfile+chr(z);
end;
//Äîñòàåì ñàìî òåëî ôàéëà
for i:=0 to sz-1 do
begin
//Ñ÷èòûâàåì 8 áèò
for n:=7 downto 0 do
begin
IFstream.Read(z,sizeof(z));
if (z and (1 shl cb))<>0 then z:=1 else z:=0;
a[n]:=z;
end;
//Ñîáèðàåì èç ýòèõ áèò áàéò
BinToHex(x,a);
//Äîïèñûâàåì áàéò ê òîìó ÷òî åñòü â ïàìÿòè - ñîáèðàåì ôàéë
DFStream.Write(x,sizeof(x));
end;
try
//Ïðåäëîæèì äëÿ ñîõðàíåíèÿ ôàéëà èìÿ, ïîä êîòîðûì îí áûë óïàêîâàí.
SaveDialog.FileName:=DFile;
//Âûçûâàåì äèàëîã ñîõðàíåíèÿ
if SaveDialog.Execute then DFile:=SaveDialog.FileName;
//Ñîõðàíÿåì èçâëå÷åííûé ôàéë
DFStream.SaveToFile(DFile);
except
MessageBox(0,PAnsiChar('Îøèáêà ïðè ïîïûòêå ñîõðàíåíèÿ.'+#13#10+DFile),'X-Date',MB_ICONERROR);
end;
IFstream.Free;
DFStream.Free;
Lst.Free;
MessageBox(0,'Âûïîëíåíî!','X-Data',MB_ICONINFORMATION);
end;
end. |