concaténer une liste de streams

Voici une class "TStreamConc" pour concaténer plusieurs streams...

pour les objets dérivé de TSream on utilise

Ecriture

Code:

---

StreamConc.Add(Stream)

---

Lecture

Code:

---

StreamConc.Extract(1,Stream)

---

pour les objets quin ne sont derivé de TSream mais ont les methoode SaveToFile,LoadFromfile on utilise

Ecriture

Code:

---

1 2 3 4 5 6 7 8 9

try   Liste.SaveToStream(StreamConc.CreateWriteStream());   finally   StreamConc.FreeStream();   end;

---

Lecture

Code:

---

1 2 3 4 5 6 7 8 9

try   Liste.LoadFromStream(StreamConc.CreateReadStream(1));   finally   StreamConc.FreeStream();   end;

---

UStreams.pas

Code:

---

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746

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.

---

EDIT
L'exemple ci-dessous montre comment gérer tois listes d'images avec formats bmp, jpg, ico

pas mal du tout, juste un petit truc :

Size en Integer ? ne crois tu pas qu'il vas y'avoir un problème ?


... quand on arrivera au-dela de 2Go ;)
et en LongWord, quand on arrivera au-dela de 4Go :)


Size -> Int64 ce sera beaucoup mieux.

voila, bon code.

Merci pour ta réaction
Oui c'est un problème si on veut aller au delas de 2GO (il y a plusieurs entiers disséminer dans la l'unité à débusquer) peut-être dans le futur proche je vais me en occuper j'essayerai aussi l'intégration des transactions pour assurer l'intégrité de fichier...