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| unit UStreams;
{Montor 10/01/2010}
interface
uses
SysUtils,Classes;
type
TStreamAddKind =(akAdd,akCompress, akCrypt);
TStreamProperties=(spNormal,spCompressed, spEncrypted,spRemoved,spEndOfStream);
TStreamConc=class;
TStreamMode = (smRead, smWrite);
TStreamEvent=procedure(Sender:TStreamConc;HeaderTag:integer;var CanAbort:boolean)of object;
TStreamHeader= packed record
Sign :Longword;
Tag :Longint;
end;
TStreamInfo= packed record
Flag :TStreamProperties;
Tag :Longint;
Size :Longint;
end;
TStreamProps= packed record
Sign :word;
Hash :word;
Prop :TStreamInfo;
end;
PStreamItem= ^TStreamItem;
TStreamItem= packed record
Position :Longword;
Prop :TStreamInfo;
end;
TLinkStream = class(TStream)
private
FStream : TStream;
FOffset : Integer;
FSize : Integer;
FMode : TStreamMode;
protected
function GetSize():Int64;override;
public
constructor Create(AStream:TStream;AOffset,ASize:integer);
function Read(var Buffer; Count: Longint): Longint; override;
function Write(const Buffer; Count: Longint): Longint; override;
function Seek(const Offset: Int64; Origin: TSeekOrigin): Int64; override;
property Mode:TStreamMode read FMode write FMode;
property Offset:integer read FOffset write FOffset;
property LimitSize:integer read FSize write FSize;
end;
TStreamCoder = class
FStream :TStream;
protected
function SameOperation(AInp,AOut:TStream):boolean;virtual;
public
function CreateStream(Dest:TStream;Mode:TStreamMode):TStream;virtual;
function Encode(AInp,AOut:TStream):boolean;virtual;
function Decode(AInp,AOut:TStream):boolean;virtual;
end;
TCompressCoder =class(TStreamCoder)
public
function CreateStream(Dest:TStream;Mode:TStreamMode):TStream;override;
function Encode(AInp,AOut:TStream):boolean;override;
function Decode(AInp,AOut:TStream):boolean;override;
end;
TCryptCoder =class(TStreamCoder)
private
FKey: Cardinal;
procedure SetKey(const Value: Cardinal);
protected
function SameOperation(AInp,AOut:TStream):boolean;override;
public
Property Key:Cardinal read FKey write SetKey;
end;
TStreamItemsList = class(TList)
private
FOnNotify: TNotifyEvent;
function Get(idx: integer): TStreamItem;
protected
procedure Notify(Ptr: Pointer; Action: TListNotification); override;
procedure DoNotify();
public
procedure AssignTo(List: TStreamItemsList);
function Add(const Item: TStreamItem): Integer;
procedure Clear; override;
procedure Delete(Index: Integer);
property Items[idx: integer]:TStreamItem read Get;
property OnNotify:TNotifyEvent read FOnNotify write FOnNotify;
end;
TStreamConc = class
private
FList : TStreamItemsList;
FStream : TStream;
FCryptCoder : TStreamCoder;
FAddCoder : TStreamCoder;
FCompressCoder: TStreamCoder;
FLinkStream : TLinkStream;
FCreateStream : TLinkStream;
FStreamOwned : TStream;
FCanWrite : boolean;
FCount : integer;
FNextWPos : integer;
FEntryPos : integer;
FInternalPos : integer;
FLoaded : boolean;
FAddKind : TStreamAddKind;
FBeforAdd : TNotifyEvent;
FAfterAdd : TNotifyEvent;
FBeforeAdd : TNotifyEvent;
FAHData : TStreamEvent;
function GetItems(idx: integer): TStreamItem;
function internalStartAdd():integer;
procedure internalCloseAdd(APos:integer);
procedure NextWritingPos();
procedure UpdateWritingPos();
procedure SetAfterAdd(const Value: TNotifyEvent);
procedure SetBeforAdd(const Value: TNotifyEvent);
procedure EditNotify(Sender:TObject);
protected
function IsValidProp(const AInp:TStreamProps):boolean;
function HashOfProp(const AInp:TStreamInfo):Word;
function Walk():Longword;
procedure DoBeforAdd();
procedure DoAfterAdd();
property LinkStream:TLinkStream read FLinkStream;
public
constructor Create(Dest:TStream);
destructor Destroy();override;
function BeginWrite(AHeaderTag:Longint=0):boolean;
function Extract(Idx:integer;AOut :TStream):boolean;
function LoadItems(AllHeaders:boolean=true):Longword;
function CreateReadStream(Idx:integer):TStream;
function CreateWriteStream():TStream;
procedure FreeStream();
procedure EndWrite();
procedure Add(AStream :TStream);
procedure ClearItems();
procedure Compact();
procedure Delete(Idx:integer);
procedure ExportItems(List: TStreamItemsList);
procedure SetAddCoder(const Value: TStreamCoder);
procedure SetCompressCoder(const Value: TStreamCoder);
procedure SetCryptCoder(const Value: TStreamCoder);
property Items[idx:integer]:TStreamItem read GetItems;
property Count:integer read FCount;
property EntryPos:integer read FEntryPos;
property AddKind:TStreamAddKind read FAddKind write FAddKind;
property Loaded:boolean read FLoaded;
property BeforAdd:TNotifyEvent read FBeforeAdd write SetBeforAdd;
property AfterAdd:TNotifyEvent read FAfterAdd write SetAfterAdd;
property AfterLoadHeaderData:TStreamEvent read FAHData write FAHData;
end;
function GetHashCode(const Buffer; Count: Integer): Word;
const
STREAMHEADER_SIZE = SizeOf(TStreamHeader);
STREAMPROPS_SIZE = SizeOf(TStreamProps);
STREAMINFO_SIZE = SizeOf(TStreamInfo);
{Tags do not change}
STREAMHEADER = $AAAAA000;
STRUC_SIGN = $AAAA;
implementation
uses zlibex,dialogs;
procedure _Assert(test:boolean;const Msg:string);
begin
if test then
raise Exception.Create(Msg);
end;
function GetHashCode(const Buffer; Count: Integer): Word;
asm
MOV ECX,EDX
MOV EDX,EAX
XOR EAX,EAX
@@1: ROL AX,5
XOR AL,[EDX]
INC EDX
DEC ECX
JNE @@1
end;
{ TLinkStream }
constructor TLinkStream.Create(AStream: TStream; AOffset, ASize: integer);
begin
if not Assigned(AStream) then
raise Exception.Create('error');
FStream := AStream;
FOffset := AOffset;
FSize := ASize;
FMode := smRead;
end;
function TLinkStream.GetSize: Int64;
begin
result:=FSize;
end;
function TLinkStream.Read(var Buffer; Count: Integer): Longint;
begin
if FMode <> smRead then
raise Exception.Create('No read');
result:= FSize - Position;
if Count > result then
Count :=result;
result:= FStream.Read(Buffer,Count);
end;
function TLinkStream.Write(const Buffer; Count: Integer): Longint;
begin
if FMode <> smWrite then
raise Exception.Create('No Write');
result:= FStream.Write(Buffer,Count);
end;
function TLinkStream.Seek(const Offset: Int64; Origin: TSeekOrigin): Int64;
begin
result:=FStream.Position;
case Origin of
soBeginning: result := FOffset+Offset;
soCurrent : Inc(result, Offset);
soEnd : result := FSize + Offset;
end;
FStream.Position:=result;
result:=result-FOffset;
end;
{ TStreamCoder}
function TStreamCoder.CreateStream(Dest:TStream;Mode: TStreamMode): TStream;
begin
raise Exception.Create('Not implemented');
end;
function TStreamCoder.SameOperation(AInp, AOut: TStream): boolean;
var
Count:integer;
begin
Result := Assigned(AInp) and Assigned(AOut);
if not Result then Exit;
Count :=AInp.Size-AInp.Position;
Result :=AOut.CopyFrom(AInp,Count) = Count;
end;
function TStreamCoder.Encode(AInp, AOut: TStream): boolean;
begin
Result :=SameOperation(AInp, AOut);
end;
function TStreamCoder.Decode(AInp, AOut: TStream): boolean;
begin
Result :=SameOperation(AInp, AOut);
end;
{ TStreamConc }
constructor TStreamConc.Create(Dest: TStream);
begin
if not Assigned(Dest) then
raise Exception.Create('error');
FList := TStreamItemsList.Create();
FStream := Dest;
FAddCoder := TStreamCoder.Create();
FCompressCoder:= TCompressCoder.Create();
FCryptCoder := TCryptCoder.Create();
Flist.FOnNotify:= EditNotify;
FAddKind := akCompress;
FEntryPos := FStream.Position;
UpdateWritingPos();
end;
destructor TStreamConc.Destroy;
begin
ClearItems();
FList.Free();
FAddCoder.Free();
FCompressCoder.Free();
FCryptCoder.Free();
FreeStream();
inherited;
end;
function TStreamConc.IsValidProp(const AInp:TStreamProps):boolean;
begin
with AInp do
result:=(HashOfProp(Prop)=Hash) and (Prop.Flag <> spEndOfStream);
end;
procedure TStreamConc.NextWritingPos();
begin
FStream.Seek(FNextWPos,soBeginning);
end;
procedure TStreamConc.UpdateWritingPos;
begin
FNextWPos:= FStream.Position;
end;
function TStreamConc.Extract(Idx: integer; AOut: TStream): boolean;
var
Ls:TLinkStream;
begin
result:=false;
if Assigned(AOut) and (Items[Idx].Prop.Flag <> spRemoved) then
with Items[Idx] do
begin
FStream.Seek(Position,soBeginning);
Ls:=TLinkStream.Create(FStream,Position,Prop.Size);
try
case Prop.Flag of
spNormal:
result:= FAddCoder.Decode(Ls,AOut);
spCompressed:
result:= FCompressCoder.Decode(Ls,AOut);
spEncrypted:
result:= FCryptCoder.Decode(Ls,AOut);
end;
finally
Ls.Free();
end;
end;
end;
function TStreamConc.GetItems(idx: integer): TStreamItem;
begin
result:=TStreamItem(FList[Idx]^);
end;
function TStreamConc.LoadItems(AllHeaders:boolean): Longword;
var
FindNextHeader:boolean;
begin
FindNextHeader :=true;
repeat
ClearItems();
result := Walk();
if result <> 0 then
begin
if Assigned(FAHData)then
FAHData(Self,result,FindNextHeader);
if not FindNextHeader then
Exit;
end;
until (result = 0)or not AllHeaders;
end;
function TStreamConc.BeginWrite(AHeaderTag:Longint):boolean;
var
H:TStreamHeader;
begin
_Assert(FCanWrite,'Can Write is on');
if FCount <> 0 then
with Items[FCount-1] do
begin
FStream.Seek(Position,soBeginning);
FStream.Seek(Prop.Size,soCurrent);
UpdateWritingPos();
end else begin
H.Sign := STREAMHEADER;
H.Tag := AHeaderTag;
NextWritingPos();
FStream.Write(H,STREAMHEADER_SIZE);
UpdateWritingPos();
end;
FCanWrite:=true;
result:=true;
end;
function TStreamConc.HashOfProp(const AInp: TStreamInfo): Word;
begin
result:=GetHashCode(AInp,STREAMINFO_SIZE);
end;
procedure TStreamConc.EndWrite;
var
Ud:TStreamProps;
begin
_Assert(not FCanWrite ,'No Begin Write');
if FCanWrite then
begin
FCanWrite := False;
Ud.Prop.Tag := 0;
Ud.Prop.Size := 0;
Ud.Prop.Flag := spEndOfStream;
Ud.Sign := STRUC_SIGN;
Ud.Hash := HashOfProp(Ud.Prop);
NextWritingPos();
FStream.Write(Ud,STREAMPROPS_SIZE);
UpdateWritingPos();
end;
end;
procedure TStreamConc.ClearItems;
begin
FList.Clear();
FCount := 0 ;
end;
procedure TStreamConc.internalCloseAdd(APos:integer);
const
sAddKinkValue:array[TStreamAddKind]of
TStreamProperties=(spNormal,spCompressed,spEncrypted);
var
OldPos:int64;
Item:TStreamItem;
Ud :TStreamProps;
begin
OldPos := FNextWPos;
UpdateWritingPos();
Ud.Sign := STRUC_SIGN;
Ud.Prop.Tag := 0;
Ud.Prop.Flag := sAddKinkValue[AddKind];
Ud.Prop.Size := FStream.Position - APos;
Ud.Hash := HashOfProp(Ud.Prop);
Item.Prop := Ud.Prop;
Item.Position := APos;
FStream.Seek(OldPos,soBeginning);
FStream.Write(Ud,STREAMPROPS_SIZE);
FList.Add(Item);
DoAfterAdd();
end;
function TStreamConc.internalStartAdd: integer;
var
Ud :TStreamProps;
begin
FillChar(Ud,STREAMPROPS_SIZE,#0);
DoBeforAdd();
NextWritingPos();
FStream.Write(Ud,STREAMPROPS_SIZE);
result := FStream.Position;
end;
procedure TStreamConc.Add(AStream: TStream);
var
D:Integer;
begin
_Assert(not FCanWrite ,'No Begin Write');
D:=internalStartAdd();
try
case AddKind of
akAdd:
FAddCoder.Encode(AStream,FStream);
akCompress:
FCompressCoder.Encode(AStream,FStream);
akCrypt:
FCryptCoder.Encode(AStream,FStream);
end;
finally
internalCloseAdd(D);
end;
end;
function TStreamConc.CreateReadStream(Idx: integer): TStream;
begin
if Assigned(FStreamOwned)or (Items[Idx].Prop.Flag = spRemoved) then
raise Exception.Create('Create stream error');
with Items[Idx] do
begin
FStream.Seek(Position,soBeginning);
FCreateStream:=TLinkStream.Create(FStream,Position,Prop.Size);
case Prop.Flag of
spNormal:
result:= FAddCoder.CreateStream(FCreateStream,smRead);
spCompressed:
result:= FCompressCoder.CreateStream(FCreateStream,smRead);
spEncrypted:
result:= FCryptCoder.CreateStream(FCreateStream,smRead);
else
result := nil;
end;
FStreamOwned:= result;
end;
end;
function TStreamConc.CreateWriteStream(): TStream;
begin
if Assigned(FStreamOwned) or not FCanWrite then
raise Exception.Create('Create Writestream error');
FCreateStream:=TLinkStream.Create(FStream,FStream.Position,0);
FCreateStream.Position:=0;
FCreateStream.Mode :=smWrite;
FInternalPos :=internalStartAdd();
case AddKind of
akAdd:
result:= FAddCoder.CreateStream(FCreateStream,smWrite);
akCompress:
result:= FCompressCoder.CreateStream(FCreateStream,smWrite);
akCrypt:
result:= FCryptCoder.CreateStream(FCreateStream,smWrite);
else
result := nil;
end;
FStreamOwned:= result;
end;
procedure TStreamConc.Compact;
begin
raise Exception.Create(' error');
end;
procedure TStreamConc.Delete(Idx: integer);
begin
raise Exception.Create(' error');
end;
procedure TStreamConc.DoAfterAdd;
begin
if Assigned(FAfterAdd) then
FAfterAdd(Self);
end;
procedure TStreamConc.DoBeforAdd;
begin
if Assigned(FBeforAdd) then
FBeforAdd(Self);
end;
procedure TStreamConc.SetAddCoder(const Value: TStreamCoder);
begin
if Assigned(Value)and (Value <> FAddCoder)then
FAddCoder := Value;
end;
procedure TStreamConc.SetCompressCoder(const Value: TStreamCoder);
begin
if Assigned(Value)and (Value <> FCompressCoder) then
FCompressCoder := Value;
end;
procedure TStreamConc.SetCryptCoder(const Value: TStreamCoder);
begin
if Assigned(Value)and (Value <>FCryptCoder) then
FCryptCoder := Value;
end;
procedure TStreamConc.SetAfterAdd(const Value: TNotifyEvent);
begin
FAfterAdd := Value;
end;
procedure TStreamConc.SetBeforAdd(const Value: TNotifyEvent);
begin
FBeforAdd := Value;
end;
function TStreamConc.Walk():Longword;
var
sHeader:TStreamHeader;
Item :TStreamItem;
CanExit:boolean;
Ud :TStreamProps;
begin
FLoaded := false;
result :=0;
FStream.Position:= FEntryPos ;
FStream.Read(sHeader,STREAMHEADER_SIZE);
if sHeader.Sign <> STREAMHEADER then
Exit;
repeat
CanExit := true;
FStream.ReadBuffer(Ud,STREAMPROPS_SIZE);
if (Ud.Sign = STRUC_SIGN) and IsValidProp(Ud) then
begin
CanExit := False;
Item.Prop := Ud.Prop;
Item.Position :=FStream.Position ;
FList.Add(Item);
FStream.Seek(Item.Prop.Size,soCurrent);
end;
until CanExit;
FLoaded :=Ud.Prop.Flag = spEndOfStream;
if FLoaded then
begin
result :=sHeader.Tag;
FEntryPos:=FStream.Position;
UpdateWritingPos();
end;
end;
procedure TStreamConc.FreeStream;
begin
FStreamOwned.Free();
if Assigned(FCreateStream)
and (FCreateStream.Mode = smWrite) then
InternalCloseAdd(FInternalPos);
if FCreateStream <> FStreamOwned then
FCreateStream.Free();
FInternalPos := -1;
FStreamOwned := nil;
FCreateStream := nil;
end;
procedure TStreamConc.ExportItems(List: TStreamItemsList);
begin
if Assigned(List) then
FList.AssignTo(List);
end;
procedure TStreamConc.EditNotify(Sender: TObject);
begin
FCount :=Flist.Count;
end;
{ TCompressCoder }
function TCompressCoder.CreateStream(Dest: TStream;
Mode: TStreamMode): TStream;
begin
case Mode of
smRead :
result:=TZDecompressionStream.Create(Dest);
smWrite:
result:=TZCompressionStream.Create(Dest,zcLevel8);
else
result := nil;
end;
end;
function TCompressCoder.Decode(AInp, AOut: TStream):boolean;
begin
ZDecompressStream(AInp,AOut);
result:=true;
end;
function TCompressCoder.Encode(AInp, AOut: TStream):boolean;
begin
ZCompressStream(AInp,AOut,zcLevel8);
result:=true;
end;
{ TCryptCoder }
function TCryptCoder.SameOperation(AInp, AOut: TStream): boolean;
const
BUFF_SIZE = 1024;
var
Buff: packed array[0..BUFF_SIZE-1] of byte;
len,i: Integer;
begin
result :=false;
repeat
len:=AInp.Read(Buff, BUFF_SIZE);
for i:= 0 to len-1 do
Buff[i]:= Buff[i] xor i xor $AA;
AOut.Write(Buff,len);
until len < BUFF_SIZE;
result:=true;
end;
procedure TCryptCoder.SetKey(const Value: Cardinal);
begin
FKey := Value;
end;
{ TStreamItemsList }
function TStreamItemsList.Add(const Item: TStreamItem): Integer;
var
P:PStreamItem;
begin
New(P);
P^:=Item;
result:= inherited Add(P);
end;
procedure TStreamItemsList.AssignTo(List: TStreamItemsList);
begin
List.Assign(Self);
inherited Clear();
DoNotify();
end;
procedure TStreamItemsList.Clear;
var
i:integer;
P:PStreamItem;
begin
for i:= 0 to Count-1 do
begin
P:=inherited Items[i];
Dispose(P);
end;
inherited;
end;
procedure TStreamItemsList.Delete(Index: Integer);
var
P:PStreamItem;
begin
P:= inherited Items[Index];
Dispose(P);
end;
procedure TStreamItemsList.DoNotify;
begin
if Assigned(FOnNotify) then
FOnNotify(Self);
end;
procedure TStreamItemsList.Notify(Ptr: Pointer; Action: TListNotification);
begin
DoNotify();
end;
function TStreamItemsList.Get(idx: integer): TStreamItem;
begin
result:=TStreamItem(inherited Items[idx]^);
end;
end. |
concaténer une liste de streams
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