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SynZipFiles.pas
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SynZipFiles.pas
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/// high-level access to .zip archive file compression
// - this unit is a part of the freeware Synopse framework,
// licensed under a MPL/GPL/LGPL tri-license; version 1.18
unit SynZipFiles;
(*
This file is part of Synopse framework.
Synopse framework. Copyright (C) 2019 Arnaud Bouchez
Synopse Informatique - https://synopse.info
*** BEGIN LICENSE BLOCK *****
Version: MPL 1.1/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Mozilla Public License Version
1.1 (the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
for the specific language governing rights and limitations under the License.
The Original Code is Synopse framework.
The Initial Developer of the Original Code is Arnaud Bouchez.
Portions created by the Initial Developer are Copyright (C) 2019
the Initial Developer. All Rights Reserved.
Contributor(s):
Alternatively, the contents of this file may be used under the terms of
either the GNU General Public License Version 2 or later (the "GPL"), or
the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the MPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the MPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****
Version 1.10
- code modifications to compile with Delphi 6 compiler
Version 1.13
- handle Unicode versions of Delphi (Delphi 2009/2010/XE)
- now officialy handle UTF-8 encoded file names inside .Zip archive
Version 1.18
- removed uneeded reference to SynCrypto unit in uses clause
- fixed pure pascal compilation issue
- unit fixed and tested with Delphi XE2 (and up) 64-bit compiler
- fixed ticket [63132b355e] about reading empty folders from .zip archive
- added TZipEntry.LocalHeader and TZipEntry.LocalDataPosition methods
*)
interface
{$I Synopse.inc} // define HASINLINE CPU32 CPU64
uses
{$ifdef MSWINDOWS}
Windows,
// USEPDF: under Windows: get ZLib 1.2.3 functions from libpdf.dll
{$ifdef USEPDF}pdf,{$endif}
{$else}
{$ifdef FPC}
SynFPCLinux,
{$endif}
{$ifdef KYLIX3}
Types,
{$endif}
{$endif}
SynCommons,
Classes,
SysUtils,
SynZip;
{
Proprietary compression/encryption adding to standard zip files
- the .zip file structure is 100% compatible with standard
- data is stored uncompressed, but passed via TSynCompressionAlgo class
- algorithms are ID-identified (from 1 to 15)
- algorithm registration is made with SynCompressionAlgos.AlgoRegister
- ID is stored in unused 7..10 bits of "flags" zip entry (cf. PKware appnote)
- TSynCompressionAlgo is called by 64KB chunks or once for whole data
- inherit from TSynCompressionAlgoBuf to simply handle 64KB chunks
- Synopse has registered several TSynCompressionAlgo IDs:
1=SynLZ-chunked 2=SynLZ-whole
3=LzoAsm-chunked 4=LzoAsm-whole
5=Bz2-chunked
6=AES-chunked 7=AES+Zip-chunked 8=AES+SynLz-chunked
so you can use 9..15 for your own purpose
- most of this unit functions are TSynCompressionAlgo aware
}
type
TZipException = class(Exception);
TSynCompressionAlgo = class
protected
fDestStream: TStream;
public
/// initialize compression into OutStream
procedure CompressInit(OutStream: TStream); virtual;
/// compress InP[InLen] into OutStream + update CRC, return compressed length
function Compress(InP: pointer; InLen: cardinal; CRC: PCardinal): cardinal; virtual; abstract;
/// called once at the end for compression flush, return compressed length
// (default implementation: just do nothing)
function CompressFinish: cardinal; virtual;
/// return uncompressed length of InP[InLen] for proper mem allocation
function UnCompressedLength(InP: pointer; InLen: cardinal): cardinal; virtual; abstract;
/// uncompress InP[InLen] into OutP, return uncompressed length (called once for decompression)
function UnCompress(InP: pointer; InLen: cardinal; OutP: pointer): cardinal; virtual; abstract;
end;
TSynCompressionAlgoClass = class of TSynCompressionAlgo;
{$ifdef UNICODE}TSynCompressionAlgos = record{$else}TSynCompressionAlgos = object{$endif}
public
Values: array of record
ID, WholeID: integer;
func: TSynCompressionAlgoClass;
end;
procedure AlgoRegister(aAlgo: TSynCompressionAlgoClass; aID,aWholeID: integer);
function Algo(aID: integer): TSynCompressionAlgoClass;
function WholeAlgoID(aID: integer): integer;
end;
/// template class for 64KB chunked (not whole) algorithm (SynLZ, LZO...)
// which forces storing as uncompressed if compression ratio has no gain
TSynCompressionAlgoBuf = class(TSynCompressionAlgo)
protected
// fast tmp buffer (size=worse case with 64KB chunk)
fCompressBuf: PAnsiChar;
function AlgoCompress(src: PAnsiChar; size: integer; dst: PAnsiChar): integer; virtual; abstract;
function AlgoCompressLength(size: integer): integer; virtual; abstract;
function AlgoUnCompress(src: PAnsiChar; size: integer; dst: PAnsiChar): integer; virtual; abstract;
function AlgoUnCompressLength(src: PAnsiChar; size: integer): integer; virtual; abstract;
public
/// initialize compression into OutStream
procedure CompressInit(OutStream: TStream); override;
/// free fCompressBuf memory if allocated
destructor Destroy; override;
/// compress InP[InLen] into OutStream + update CRC, return compressed length
function Compress(InP: pointer; InLen: cardinal; CRC: PCardinal): cardinal; override;
/// return uncompressed length of InP[InLen] for proper mem allocation
function UnCompressedLength(InP: pointer; InLen: cardinal): cardinal; override;
/// uncompress InP[InLen] into OutP, return uncompressed length
function UnCompress(InP: pointer; InLen: cardinal; OutP: pointer): cardinal; override;
end;
/// template class for whole algorithm (SynLZ, LZO...)
// which forces storing as uncompressed if compression ratio has no gain
TSynCompressionAlgoWhole = class(TSynCompressionAlgo)
protected
function AlgoCompress(src: PAnsiChar; size: integer; dst: PAnsiChar): integer; virtual; abstract;
function AlgoCompressLength(size: integer): integer; virtual; abstract;
function AlgoUnCompress(src: PAnsiChar; size: integer; dst: PAnsiChar): integer; virtual; abstract;
function AlgoUnCompressLength(src: PAnsiChar; size: integer): integer; virtual; abstract;
public
/// compress InP[InLen] into OutStream + update CRC, return compressed length
function Compress(InP: pointer; InLen: cardinal; CRC: PCardinal): cardinal; override;
/// return uncompressed length of InP[InLen] for proper mem allocation
function UnCompressedLength(InP: pointer; InLen: cardinal): cardinal; override;
/// uncompress InP[InLen] into OutP, return uncompressed length
function UnCompress(InP: pointer; InLen: cardinal; OutP: pointer): cardinal; override;
end;
TZipCompressor = class(TStream)
private
fInitialized: Boolean;
fDestStream: TStream;
fStrm: TZStream;
fAlgorithm: TSynCompressionAlgo;
fAlgorithmStream: THeapMemoryStream;
fAlgorithmID: integer; // =0 if not Assigned(fAlgorithm)
fCRC: Cardinal;
fBlobDataHeaderPosition: integer;
fBufferIn, fBufferOut: array[word] of byte; // two 64kb buffers
procedure Finish;
function FlushBufferOut: integer;
function InFlateDeflate: boolean; // return true if error
function GetSizeIn: cardinal;
function GetSizeOut: cardinal;
public
constructor Create(outStream: TStream; CompressionLevel: Integer;
Algorithm: integer=0);
constructor CreateAsBlobData(outStream: TStream; CompressionLevel: Integer;
Algorithm: integer=0);
destructor Destroy; override;
function Read(var Buffer; Count: Longint): Longint; override;
function Write(const Buffer; Count: Longint): Longint; override;
function WriteOnce(const Buffer; Count: Longint): Longint;
function Seek(Offset: Longint; Origin: Word): Longint; override;
property SizeIn: cardinal read GetSizeIn;
property SizeOut: cardinal read GetSizeOut;
property CRC: cardinal read fCRC;
end;
TGzWriter = class(TZipCompressor)
private
outFile: TStream;
outFileToBeFree: boolean;
public
constructor Create(const aFileName: TFileName); overload;
constructor Create(const aDestStream: TStream); overload;
// use Write() to add some data
destructor Destroy; override;
end;
PZipEntry = ^TZipEntry;
TZipEntry = {$ifdef UNICODE} record {$else} object {$endif}
ZipName: RawUTF8;
Header: TFileHeader; // as stored in standard .zip file
function SameAs(const aEntry: TZipEntry): boolean;
// test if algo is registered, perform crc32 check and create one instance
function AlgoCreate(data: pointer; const FileName: TFileName): TSynCompressionAlgo;
function LocalHeader(ZipStart: PAnsiChar): PLocalFileHeader;
function LocalDataPosition(ZipStart: PAnsiChar): PtrUInt;
end;
TZipCommon = class
private
fCount: integer;
fFileName: TFileName;
public
Entry: array of TZipEntry;
constructor Create(const aFileName: TFileName);
destructor Destroy; override;
function ZipNameIndexOf(const aZipName: RawUTF8): integer;
property Count: integer read fCount;
property FileName: TFileName read fFileName;
end;
// used to transfert Blob Data from/to Client without compress/uncompress:
{$A-}
PBlobData = ^TBlobData;
{$ifdef UNICODE}TBlobData = record{$else}TBlobData = object{$endif}
private
// test if algo is registered, perform crc32 check and create one instance
function AlgoCreate(data: pointer): TSynCompressionAlgo;
public
dataSize, // always used
dataFullSize, dataCRC: cardinal; // used only if AlreadyCompressed
dataMethod: byte; // 0=stored 8=inflate >=16: AlgoID=dataMethod shr 4
databuf: AnsiChar;
function AlgoID: cardinal;
procedure SetFrom(const FileInfo: TFileInfo);
// uncompress if necessary:
function Expand: RawByteString;
// do freemem() if dataMethod<>0; no direct AES since may be mapped
function ExpandBuf(out destSize: cardinal): pointer;
procedure ExpandStream(Stream: TStream);
function Next: PAnsiChar; // points to next bloc
end;
{$A8}
const
BLOBDATA_HEADSIZE = sizeof(TBlobData)-sizeof(AnsiChar); // databuf: AnsiChar
type
TZipReader = class(TZipCommon)
protected
fMap: TMemoryMap;
public
constructor Create(const aFileName: TFileName);
destructor Destroy; override;
procedure Clear; // force Count=0
function GetData(aIndex: integer; aStream: TStream=nil; CheckCRC: boolean=false;
asBlobDataStored: boolean=false; withAlgoDataLen: boolean=false): PAnsiChar;
function GetString(aIndex: integer): RawByteString;
function GetBuffer(aIndex: integer; out Dest: PAnsiChar): integer;
function GetBlobData(aIndex: integer): RawByteString; overload; // PBlobData(result)
procedure GetBlobData(aIndex: integer; aStream: TStream); overload; // TBlobData->aStream
procedure DeleteLastEntry; // don't use inside TZipValues: already done in Create
procedure SaveToStream(aStream: TStream); // save uncompressed to stream
function SameAs(aReader: TZipReader): boolean;
property Map: TMemoryMap read fMap;
end;
TZipWriter = class(TZipCommon)
private
outFile: TFileStream;
fNow: integer;
fDestFileName: TFileName;
function AddEntry(const aZipName: RawUTF8; FileAge: integer = 0): PZipEntry;
public
Zip: TZipCompressor;
forceFileAge: integer; // <>0 -> will be used in Destroy to dest file
constructor Create(const aFileName: TFileName); overload;
constructor Create(AppendTo: TZipReader; ReCreate: boolean=false); overload;
constructor Create(fromStream: TStream; const DestFilename: TFileName=''); overload;
// restore after TZipReader.SaveToStream()
destructor Destroy; override;
/// this Creates a TZipCompressor -> user Zip.Write() to send data:
// if CompressionLevel<0: direct copy
procedure ZipCreate(const aZipName: RawUTF8; CompressionLevel: integer;
FileAge: integer = 0; Algorithm: integer=0);
/// compression finish, fileInfo update+save, Zip.Free;
// after ZipCreate: let aIndex=-1 will update Entry[Count]+inc(fCount)
procedure ZipClose(aIndex: integer=-1);
procedure Add(const aZipName: RawUTF8; data: PAnsiChar; dataSize: cardinal;
CompressionLevel: integer; dataCRC: pCardinal=nil;
FileAge: integer = 0; Algorithm: integer=0); overload;
procedure Add(const aZipName: RawUTF8; p: PBlobData); overload;
procedure Add(aReader: TZipReader; aReaderIndex: integer); overload;
procedure AddFile(const aFileName: TFileName; const aZipName: RawUTF8;
CompressionLevel: integer; Algorithm: integer=0);
function LastCRC32Added: cardinal;
end;
// TZip handles ZIP standard files on disk
TZip = class
private
FileQueue: TStringList;
SomeDeleted: boolean;
public
Reader: TZipReader;
Writer: TZipWriter;
constructor Create(const aFileName: TFileName);
destructor Destroy; override;
function FileName: TFileName;
function MarkDeleted(aReaderIndex: integer): boolean; virtual; // before any ZipCreate
function MarkDeletedBefore(aDate: TDateTime; aBackup: TZip=nil): boolean;
procedure BeginWriter; virtual;
function ZipCreate(const aZipName: RawUTF8; CompressionLevel: integer;
Algorithm: integer=0): TZipCompressor;
// use Zip.Write() to send data before ZipClose
procedure ZipClose;
function AddBuf(const aZipName: RawUTF8; CompressionLevel: integer;
data: pointer; dataSize: cardinal; Algorithm: integer=0): boolean;
function AddToFileQueue(const aFileName: TFileName;
const aZipName: RawUTF8): boolean; // flushed at Destroy
function SameAs(aZip: TZip): boolean;
function FileQueueCount: integer;
end;
TZipValues = class(TZip)
// store some Values[] in a .zip file (TBlob, TBlobDiff, TDC4...)
protected // all this must be overrided according to Values[]:
procedure LoadValues(data: PAnsiChar); virtual; abstract;
// SetLength(Values,Count+10); move(data,Values[0],Count*sizeof(Values[0]));
procedure SaveValues(Zip: TZipCompressor); virtual; abstract;
public
Count: integer;
modified: boolean;
constructor Create(const aFileName: TFileName); // make Reader.Create
destructor Destroy; override;
function GetValue(aReaderIndex: integer; aStream: TStream=nil): PAnsiChar;
procedure CopyValue(source, dest: integer); virtual; abstract;
// Values[dest] := Values[source];
procedure BeginWriter; override;
function MarkDeleted(aReaderIndex: integer): boolean; override; // before any AddValue
end;
var
BlobDataNull: TBlobData;
SynCompressionAlgos: TSynCompressionAlgos;
procedure CompressAsBlobData(const data; size: integer; aStream: TStream;
CompressionLevel: integer=6; Algorithm: integer=0);
// create a TBlobData in aStream - can use encryption with algo
// 7=AES+Zip-chunked and 8=AES+SynLz-chunked
function GZRead(const aFileName: TFileName): RawByteString; overload;
function GZRead(gz: PAnsiChar; gzLen: integer): RawByteString; overload;
procedure GZRead(const aFileName: TFileName; aStream: TStream; StoreLen: boolean); overload;
// direct uncompress .gz file into string or TStream
implementation
const // TZipException messages:
sZlibInternalError = 'zlib: Internal error';
sIncorrectZipFormatN = 'Incorrect zip format in file %s: %s';
sZipAlgoIDNUnknownN = 'Algo ID %d unknown for %s';
sZipCrcErrorNN = 'crc32 checksum error for %s in %s';
{ TZipCommon }
constructor TZipCommon.Create(const aFileName: TFileName);
begin
fFileName := aFileName;
end;
destructor TZipCommon.Destroy;
begin
Finalize(Entry);
inherited;
end;
function TZipCommon.ZipNameIndexOf(const aZipName: RawUTF8): integer;
begin
for result := 0 to Count-1 do
if SameTextU(Entry[result].ZipName,aZipName) then
exit;
result := -1;
end;
{ TZipReader }
procedure TZipReader.Clear;
begin
fCount := 0;
Map.UnMap;
end;
constructor TZipReader.Create(const aFileName: TFileName);
var i: integer;
lhr: ^TLastHeader;
H: ^TFileHeader;
tmp: WinAnsiString;
LastHeaderPosition: integer;
procedure Error(const msg: string);
begin
// MessageBox(0,pointer(fFileName),'Incorrect format',MB_ICONERROR);
Map.UnMap;
fCount := 0;
raise TZipException.CreateFmt(sIncorrectZipFormatN,[fFileName,msg]);
end;
begin
// 1. open aFileName
inherited; // fFileName := aFileName;
Map.Map(fFileName);
if Map.Buffer=nil then exit;
// 2. find last header, in order to reach the TFileHeader entries
if Map.Size<sizeof(lhr^) then begin
Error('file too small');
exit;
end;
lhr := @Map.Buffer[Map.Size-sizeof(lhr^)];
with lhr^ do begin
if signature<>$06054b50 then begin
Error('missing trailing signature');
exit;
end;
fCount := thisFiles;
SetLength(Entry,Count);
LastHeaderPosition := headerOffset;
end;
// 3. read all TFileHeader entries and fill Entry[] with its values
H := @Map.Buffer[LastHeaderPosition];
for i := 0 to Count-1 do
with H^ do begin
if signature<>$02014b50 then begin
Error('missing local signature');
break;
end;
if (fileInfo.flags and (1 shl 3)<>0) or // crc+sizes in "data descriptor"
(fileInfo.zzipSize=0) or (fileInfo.zfullSize=0) then begin
Error('unexpected "data descriptor"');
break; // not handled yet: use SynZip's TZipRead to access this archive
end;
with Entry[i] do begin
{$ifdef MSWINDOWS}
if FileInfo.GetUTF8FileName then
SetString(ZipName,PAnsiChar(H)+sizeof(H^),fileInfo.nameLen) else begin
SetLength(tmp,fileInfo.nameLen); // convert from DOS/OEM into WinAnsi
OemToCharBuffA(PAnsiChar(H)+sizeof(H^),pointer(tmp),fileInfo.nameLen);
ZipName := WinAnsiToUtf8(tmp);
end;
{$else}
SetString(ZipName,PAnsiChar(H)+sizeof(H^),fileInfo.nameLen);
{$endif}
ZipName := StringReplaceChars(ZipName,'/','\');
Header := H^;
end; // next entry is after the ZipNname and some extra/comment
inc(PByte(H),sizeof(H^)+fileInfo.nameLen+fileInfo.extraLen+commentLen);
end;
end;
procedure TZipReader.DeleteLastEntry;
// don't use inside TZipValues: already done in TZipValues.Create
begin
if Count<=0 then
exit;
dec(fCount);
end;
destructor TZipReader.Destroy;
begin
Map.UnMap;
inherited;
end;
function TZipReader.GetBlobData(aIndex: integer): RawByteString;
begin
result := '';
if (self=nil) or (cardinal(aIndex)>=cardinal(Count)) or (Map.Buffer=nil) then
exit;
with Entry[aIndex], LocalHeader(Map.Buffer)^ do
if not Header.IsFolder then begin
SetLength(result,fileInfo.zzipSize+BLOBDATA_HEADSIZE);
with PBlobData(result)^ do begin
SetFrom(fileInfo);
move(LocalData^,databuf,datasize);
end;
end;
end;
procedure TZipReader.GetBlobData(aIndex: integer; aStream: TStream);
// put TBlobData in aStream
var blob: TBlobData;
begin
if (self=nil) or (aIndex<0) or (aIndex>=Count) or (Map.Buffer=nil) then
aStream.WriteBuffer(BlobDataNull,BLOBDATA_HEADSIZE) else
with Entry[aIndex], LocalHeader(Map.Buffer)^ do begin
blob.SetFrom(fileInfo);
aStream.WriteBuffer(blob,BLOBDATA_HEADSIZE);
aStream.WriteBuffer(LocalData^,blob.dataSize);
end;
end;
function TZipReader.GetBuffer(aIndex: integer; out Dest: PAnsiChar): integer;
begin
result := 0;
Dest := nil;
if (self=nil) or (aIndex<0) or (aIndex>=Count) or (Map.Buffer=nil) then
exit;
with Entry[aIndex], LocalHeader(Map.Buffer)^, fileInfo do
if not Header.IsFolder then begin
result := zfullSize;
if AlgoID<>0 then begin
with AlgoCreate(LocalData,FileName) do // crc32+algo object create
try // algo registered (no TZipException raised) -> uncompress
result := UnCompressedLength(LocalData,zfullsize);
Getmem(Dest,result);
UnCompress(LocalData,zfullsize,Dest); // direct uncompress into Dest
finally
Free;
end;
exit;
end;
Getmem(Dest,zfullSize);
if zfullSize>0 then
case zzipMethod of
0: move(LocalData^,Dest^,result); // stored = direct copy
8: if (UnCompressMem(LocalData,Dest,zzipSize,zfullSize)<>integer(zfullSize)) or
(crc32(0,Dest,zfullSize)<>zcrc32) then begin
Freemem(Dest);
Dest := nil;
raise TZipException.CreateFmt(sZipCrcErrorNN,[Entry[aIndex].ZipName,FileName]);
end;
end;
end;
end;
function TZipReader.GetData(aIndex: integer; aStream: TStream=nil;
CheckCRC: boolean=false; asBlobDataStored: boolean=false; withAlgoDataLen: boolean=false): PAnsiChar;
// aStream=nil -> return bulk memory data position in mapped file
// aStream<>nil -> uncompress and un-algo into aStream; CheckCRC=true -> force check CRC
// asBlobDataStored=true -> PBlobData stored format into aStream
// withAlgoDataLen=true -> unCompressed algo length stored into aStream
var CRC: cardinal;
CRCP: PCardinal;
Blob: TBlobData;
tmp: PAnsiChar;
L: cardinal;
begin
result := nil;
if (self=nil) or (aIndex<0) or (aIndex>=Count) or (Map.Buffer=nil) then
exit;
with Entry[aIndex], LocalHeader(Map.Buffer)^ do
if not Header.IsFolder then begin
result := LocalData;
if aStream=nil then
exit; // no decompress to stream: only get result PAnsiChar [and DataLen^]
if fileInfo.AlgoID<>0 then begin // bits 7..10 are used for algo
// un-algo specific uncompression
L := GetBuffer(aIndex,tmp); // uncompress with algo (always check crc)
if tmp<>nil then
try
if asBlobDataStored then begin // algo: add uncompressed data header
Blob.dataSize := L;
Blob.dataFullSize := L;
Blob.dataCRC := crc32(0,tmp,L);
Blob.dataMethod := fileInfo.AlgoID shl 4; // 0=stored + AlgoID
aStream.WriteBuffer(Blob,BLOBDATA_HEADSIZE);
end else
if withAlgoDataLen then
aStream.WriteBuffer(L,4);
aStream.WriteBuffer(tmp^,L); // write uncompressed
finally
freemem(tmp);
end;
end else begin // standard zip format
if asBlobDataStored then begin
Blob.dataSize := FileInfo.zfullSize;
Blob.dataFullSize := FileInfo.zfullSize;
Blob.dataCRC := FileInfo.zcrc32;
Blob.dataMethod := 0; // stored, since will be uncompressed below
aStream.WriteBuffer(Blob,BLOBDATA_HEADSIZE);
end;
case fileInfo.zzipMethod of
0: begin
aStream.WriteBuffer(result^,fileInfo.zfullSize); // stored = direct copy
if CheckCRC then
CRC := crc32(0,result,fileInfo.zfullSize);
end;
8: begin // deflate
if CheckCRC then
CRCP := @CRC else CRCP := nil;
if UnCompressStream(result,fileInfo.zzipSize,aStream,CRCP)
<>fileInfo.zfullSize then result := nil;
end;
end; // case fileInfo.zzipMethod of
if CheckCRC and (CRC<>fileInfo.zcrc32) then
result := nil;
end;
end;
end;
function TZipReader.GetString(aIndex: integer): RawByteString;
begin
result := '';
if (self=nil) or (aIndex<0) or (aIndex>=Count) or (Map.Buffer=nil) then
exit;
with Entry[aIndex], LocalHeader(Map.Buffer)^, fileInfo do
if not Header.IsFolder then begin
if AlgoID<>0 then begin // special algo
with AlgoCreate(LocalData,FileName) do // crc32+algo object create
try // algo registered (no TZipException raised) -> uncompress
SetLength(result,UnCompressedLength(LocalData,zfullsize));
if UnCompress(LocalData,zfullsize,pointer(result))<> // direct uncompress into string
cardinal(length(result)) then
raise TZipException.CreateFmt(sZipCrcErrorNN,[Entry[aIndex].ZipName,FileName]);
finally
Free;
end;
end else // no algo: normal .zip file
case zzipMethod of
0: SetString(result,LocalData,zfullSize); // stored = direct copy
8: begin // deflate:
SetLength(result,zfullSize);
if (UnCompressMem(LocalData,pointer(result),zzipSize,zfullSize)<>integer(zfullSize)) or
(crc32(0,pointer(result),zfullSize)<>zcrc32) then
raise TZipException.CreateFmt(sZipCrcErrorNN,[Entry[aIndex].ZipName,FileName]);
end;
end;
end;
end;
function TZipReader.SameAs(aReader: TZipReader): boolean;
var i: integer;
begin
result := self=aReader; if result then exit;
if (self=nil) or (aReader=nil) or (Count<>aReader.Count) then
exit;
for i := 0 to Count-1 do
if not Entry[i].SameAs(aReader.Entry[i]) then
exit;
for i := 0 to Count-1 do
with Entry[i], LocalHeader(Map.Buffer)^ do
if not Header.IsFolder then
if not Comparemem(LocalData,
aReader.Entry[i].LocalHeader(aReader.Map.Buffer).LocalData,fileInfo.zzipSize) then
exit;
result := true;
end;
procedure TZipReader.SaveToStream(aStream: TStream);
var i: integer;
L: cardinal;
aName: RawUTF8;
begin
aName := StringToUTF8(ExtractFileName(fFileName));
// 1. write global params
L := length(aName);
aStream.WriteBuffer(L,1);
aStream.WriteBuffer(aName[1],L); // UTF-8 encoded file name
aStream.WriteBuffer(fCount,4);
// 2. write Entry[].ZipName
for i := 0 to Count-1 do
with Entry[i] do begin
assert(not Header.IsFolder,'empty folders streaming is not implemented');
aStream.WriteBuffer(Header.fileInfo,sizeof(Header.fileInfo));
aStream.WriteBuffer(pointer(ZipName)^,Header.fileInfo.NameLen);
end;
// 3. write all uncompressed data
for i := 0 to Count-1 do
with Entry[i] do // withAlgoDataLen=true: algo -> uncompressed length stored
GetData(i,aStream,false,false,true); // deflate and un-algo if necessary
end;
{ TZip }
function TZip.AddBuf(const aZipName: RawUTF8; CompressionLevel: integer;
data: pointer; dataSize: cardinal; Algorithm: integer=0): boolean;
var Z: TZipCompressor;
begin
if self=nil then begin
result := false;
exit;
end;
if dataSize<512 then
CompressionLevel := -1; // force store if too small
Z := ZipCreate(aZipName,CompressionLevel,Algorithm); // Z=Writer.Zip
result := Z<>nil;
if not result then exit;
Z.WriteOnce(data^,dataSize);
ZipClose;
end;
function TZip.AddToFileQueue(const aFileName: TFileName; const aZipName: RawUTF8): boolean;
// flushed at Destroy
var i: integer;
begin
result := false;
if self=nil then exit;
if Writer=nil then begin
i := Reader.ZipNameIndexOf(aZipName);
if i>=0 then
MarkDeleted(i);
end else
if Writer.ZipNameIndexOf(aZipName)>=0 then
exit;
if FileQueue=nil then
FileQueue := TStringList.Create;
FileQueue.Values[aFileName] := UTF8ToString(aZipName);
result := true;
end;
procedure TZip.BeginWriter;
begin
if (self<>nil) and (Writer=nil) then
Writer := TZipWriter.Create(Reader); // append Reader, recreate=false
end;
constructor TZip.Create(const aFileName: TFileName);
begin
Reader := TZipReader.Create(aFileName);
// Writer will be created as necessary
end;
function GetValueFromIndex(List: TStrings; Index: Integer): string;
begin // not defined before Delphi 7
if Index >= 0 then
Result := Copy(List[Index],Length(List.Names[Index])+2,MaxInt) else
Result := '';
end;
destructor TZip.Destroy;
var i, method: integer;
zipName: TFileName;
begin
ZipClose; // close pending Writer.Zip if any
if SomeDeleted and (Writer=nil) and
((FileQueue=nil) or (FileQueue.Count=0)) then
BeginWriter else
if FileQueue<>nil then
for i := 0 to FileQueue.Count-1 do begin
zipName := GetValueFromIndex(FileQueue,i);
if zipName='' then
continue;
if GetFileNameExtIndex(zipName,'zip,jpg,jpeg,gz,bz2,bZ,7z,gif,bj,bjt')>=0 then
method := -1 else // store already compressed file
method := 6; // normal deflate compression
if Writer=nil then
BeginWriter;
Writer.AddFile(FileQueue.Names[i],StringToUTF8(zipName),method);
end;
FreeAndNil(FileQueue);
FreeAndNil(Reader);
FreeAndNil(Writer);
inherited;
end;
function TZip.FileName: TFileName;
begin
if (self=nil) or (Reader=nil) then
result := '' else
result := Reader.fFileName;
end;
function TZip.FileQueueCount: integer;
begin
if FileQueue=nil then
result := 0 else
result := FileQueue.Count;
end;
function TZip.MarkDeleted(aReaderIndex: integer): boolean;
begin
result := (self<>nil)and(Writer=nil)and(aReaderIndex>=0)and(aReaderIndex<Reader.Count);
if not result then
exit;
SomeDeleted := true;
//if aReaderIndex=Reader.Count-1 then Reader.DeleteLastEntry else !TZipValues use signature!
Reader.Entry[aReaderIndex].Header.signature := 0; // just signature = 0 to delete
end;
{$ifndef MSWINDOWS}
function DateTimeToFileDateWindows(DateTime: TDateTime): Integer;
var
Year, Month, Day, Hour, Min, Sec, MSec: Word;
begin
DecodeDate(DateTime, Year, Month, Day);
if (Year < 1980) or (Year > 2107) then
Result := 0 else begin
DecodeTime(DateTime, Hour, Min, Sec, MSec);
LongRec(Result).Lo := (Sec shr 1) or (Min shl 5) or (Hour shl 11);
LongRec(Result).Hi := Day or (Month shl 5) or ((Year - 1980) shl 9);
end;
end;
function NowToFileDateWindows: Integer;
begin
result := DateTimeToFileDateWindows(Now);
end;
{$endif}
function TZip.MarkDeletedBefore(aDate: TDateTime; aBackup: TZip=nil): boolean;
var dt, i: integer;
begin
result := false;
if (self=nil) or (Writer<>nil) then
exit;
dt := {$ifdef MSWINDOWS}DateTimeToFileDate{$else}DateTimeToFileDateWindows{$endif}(aDate);
for i := 0 to Reader.Count-1 do
with Reader.Entry[i].Header do
if (signature<>0) and (fileInfo.zlastMod<dt) then begin
if aBackup<>nil then begin
aBackup.BeginWriter;
aBackup.Writer.Add(Reader,i);
end;
MarkDeleted(i);
result := true;
end;
end;
function TZip.SameAs(aZip: TZip): boolean;
begin
result := self=aZip;
if result then
exit;
if (self=nil) or (aZip=nil) then
exit;
assert(Writer=nil);
if Writer<>nil then
exit;
result := Reader.SameAs(aZip.Reader);
end;
procedure TZip.ZipClose;
begin
if (self=nil) or (Writer=nil) then exit;
Writer.ZipClose;
end;
function TZip.ZipCreate(const aZipName: RawUTF8; CompressionLevel: integer;
Algorithm: integer=0): TZipCompressor;
// use TZipCompressor.Write() to send data - CompressionLevel<0 -> force store
var i: integer;
ZipName: string;
begin
result := nil;
if self=nil then exit;
if Writer=nil then begin
i := Reader.ZipNameIndexOf(aZipName);
if (i>=0) then
MarkDeleted(i);
end else
if Writer.ZipNameIndexOf(aZipName)>=0 then
exit;
if FileQueue<>nil then begin
ZipName := UTF8ToString(aZipName);
for i := 0 to FileQueue.Count-1 do
if GetValueFromIndex(FileQueue,i)=ZipName then begin
FileQueue.Delete(i);
break;
end;
end;
BeginWriter;
if Writer.Zip<>nil then
exit;
Writer.ZipCreate(aZipName,CompressionLevel,0,Algorithm);
result := Writer.Zip;
end;
{ TCompressorDecompressor }
constructor TZipCompressor.Create(outStream: TStream; CompressionLevel, Algorithm: Integer);
var Algo: TSynCompressionAlgoClass;
begin
fDestStream := outStream;
fBlobDataHeaderPosition := -1; // not AsBlobData
StreamInit(FStrm);
FStrm.next_out := @FBufferOut;
FStrm.avail_out := SizeOf(FBufferOut);
FStrm.next_in := @FBufferIn;
if Algorithm<>0 then begin
Algo := SynCompressionAlgos.Algo(Algorithm);
if not Assigned(Algo) then // unknown algo -> error
raise TZipException.CreateFmt(sZipAlgoIDNUnknownN,[Algorithm,ClassName]);
fAlgorithm := Algo.Create;
fAlgorithmID := Algorithm;
fAlgorithm.CompressInit(fDestStream);
if SynCompressionAlgos.WholeAlgoID(Algorithm)=Algorithm then
// whole algo = not a 64KB chunked algo
fAlgorithmStream := THeapMemoryStream.Create; // create temp buffer
end else begin
if CompressionLevel>=0 then // FInitialized=false -> direct copy to FDestStream
fInitialized := Check(deflateInit2_(FStrm, CompressionLevel, Z_DEFLATED,
-MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,ZLIB_VERSION, sizeof(FStrm)),
[Z_OK])=Z_OK; // -MAX_WBITS -> no zLib header => .zip compatible !
end;
end;
constructor TZipCompressor.CreateAsBlobData(outStream: TStream;
CompressionLevel, Algorithm: Integer);
begin
Create(outStream,CompressionLevel,Algorithm);
fBlobDataHeaderPosition := outStream.Seek(0,soFromCurrent);
outStream.WriteBuffer(FBufferOut,BLOBDATA_HEADSIZE); // save Bulk header
end;
destructor TZipCompressor.Destroy;
var p: integer;
blob: TBlobData;
begin
if FInitialized then begin
FStrm.next_out := nil;
FStrm.avail_out := 0;
deflateEnd(FStrm);
end else begin
FreeAndNil(fAlgorithmStream);
FreeAndNil(fAlgorithm);
end;
if fBlobDataHeaderPosition>=0 then begin // CreateAsBlobData() -> update header
p := fDestStream.Seek(0,soFromCurrent);
with blob do begin
dataFullSize := SizeIn;
dataSize := p-fBlobDataHeaderPosition-BLOBDATA_HEADSIZE;
assert(dataSize=SizeOut);
dataCRC := CRC;
// dataMethod: 0=stored 8=inflate >16: AlgoID=dataMethod shr 4
if FInitialized then
dataMethod := 8 else
dataMethod := fAlgorithmID shl 4; // stored + AlgoID
end;
fDestStream.Seek(fBlobDataHeaderPosition,soFromBeginning);
fDestStream.WriteBuffer(blob,BLOBDATA_HEADSIZE);
fDestStream.Seek(p,soFromBeginning);
end;
inherited;
end;
procedure TZipCompressor.Finish;
begin
if (self=nil) then exit;
if assigned(fAlgorithm) then begin
if assigned(fAlgorithmStream) then begin
fAlgorithmStream.WriteBuffer(fBufferIn,fStrm.avail_in); // write pending data
fStrm.total_in := fAlgorithm.Compress( // compress whole data at once
fAlgorithmStream.Memory,fAlgorithmStream.Seek(0,soFromCurrent),@fCRC);
end else
if FStrm.avail_in>0 then
inc(fStrm.total_in,fAlgorithm.Compress(@fBufferIn,FStrm.avail_in,@fCRC));
inc(fStrm.total_in,fAlgorithm.CompressFinish); // finish compression
fStrm.total_out := fStrm.total_in; // .zip file compression mode = stored
exit;
end;
if not FInitialized then
exit;
while FStrm.avail_in > 0 do begin // compress pending data
if InFlateDeflate then
raise TZipException.Create(SZlibInternalError);
if FStrm.avail_out = 0 then
FlushBufferOut;
end;
FStrm.next_in := nil;
FStrm.avail_in := 0;
while (Check(deflate(FStrm, Z_FINISH), [Z_OK, Z_STREAM_END]) <> Z_STREAM_END) and
(FStrm.avail_out = 0) do
FlushBufferOut;
FlushBufferOut;
end;
function TZipCompressor.FlushBufferOut: integer;
begin
Result := 0;
if not FInitialized then
exit;
if FStrm.avail_out < SizeOf(FBufferOut) then begin
Result := SizeOf(FBufferOut) - FStrm.avail_out;
FDestStream.WriteBuffer(FBufferOut, Result);
FStrm.next_out := @FBufferOut;
FStrm.avail_out := SizeOf(FBufferOut);