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SynZip.pas
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/// low-level access to ZLib compression (1.2.5 engine version)
// - this unit is a part of the freeware Synopse framework,
// licensed under a MPL/GPL/LGPL tri-license; version 1.18
unit SynZip;
{
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):
- Alf
- ehansen
- jpdk
- Gigo
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 *****
ORIGINAL LICENSE:
zlib.h -- interface of the 'zlib' general purpose compression library
version 1.2.5, April 19th, 2010
Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Jean-loup Gailly
Mark Adler
Cross-platform ZLib implementation
====================================
Link to original C-compiled ZLib library
- Win32: use fast obj and inline asm
- Linux: use available system library libz.so
Also defines .zip file structure (TFileInfo TFileHeader TLastHeader)
Version 1.3
- Delphi 2009/2010 compatibility (Unicode)
Version 1.3.1 - January 23, 2010
- issue corrected in CompressStream()
- compilation of TSynZipCompressor under Delphi 2009/2010, without any
Internal Error DT5830 (triggered with my Delphi 2009 Update 3)
Version 1.3.2 - February 5, 2010
- added .zip direct reading class
Version 1.4 - February 8, 2010
- whole Synopse SQLite3 database framework released under the GNU Lesser
General Public License version 3, instead of generic "Public Domain"
Version 1.5 - February 11, 2010
- added .zip direct writing class
Version 1.9
- crc32 is now coded in inlined fast asm (crc32.obj is no longer necessary)
- crc32 hashing is performed using 8 tables, for better CPU pipelining and
faster execution
- crc32 tables are created on the fly during unit initialization, therefore
save 8 KB of code size from standard crc32.obj, with no speed penalty
Version 1.9.2
- both obj files (i.e. deflate.obj and trees.obj) updated to version 1.2.5
Version 1.13
- code modifications to compile with Delphi 5 compiler
- new CompressGZip and CompressDeflate functions, for THttpSocket.RegisterCompress
- now handle Unicode file names UTF-8 encoded inside .Zip archive
- new TZipWrite.CreateFrom constructor, to add some new content to an
existing .Zip archive
- EventArchiveZip function can be used as a TSynLogArchiveEvent handler to
compress old .log files into a .zip standard archive
Version 1.15
- unit now tested with Delphi XE2 (32 Bit)
Version 1.16
- unit now compiles with Delphi XE2 (64 Bit)
- TZipWrite.AddDeflated(const aFileName) method will use streaming instead
of in-memory compression (will handle huge files much efficiently, e.g.
log files as for EventArchiveZip)
Version 1.18
- defined ZipString dedicated type, to store data in a Unicode-neutral manner
- introducing new TZipWriteToStream class, able to create a zip without file
- added TFileHeader.IsFolder and TLocalFileHeader.LocalData methods
- added TZipRead.UnZip() overloaded methods using a file name parameter
- added DestDirIsFileName optional parameter to TZipRead.UnZip() methods
- added TZipRead.UnZipAll() method
- fixed CompressDeflate() function, which was in fact creating zlib content
- fixed TZipWrite.AddDeflated() to handle data > 200 MB - thanks jpdk!
- fixed unexpected error when adding files e.g. via TZipWrite.CreateForm()
to an empty archive - thanks Gigo for the feedback!
- addded CompressZLib() function, as expected by web browsers
- any zip-related error will now raise a ESynZipException
- fixed ticket [2e22dd25aa] about TZipRead.UnMap
- fixed ticket [431b8b3dd9d] about gzread() overoptimistic assertion
- fixed UnZip() when crc and sizes are stored not within the file header,
but in a separate data descriptor block, after the compressed data (this
may occur e.g. if the .zip is created with latest Java JRE) - also added
corresponding TZipRead.RetrieveFileInfo() method and renamed TZipEntry
info field into infoLocal, and introduced infoDirectory new field
- renamed ZipFormat parameter to ZlibFormat, and introduce it also for
uncompression, so that both deflate and zlib layout are handled
- allow reading files of size 0 in TZipRead
- fixed TZipWrite.Destroy issue as reported by [aa468640c59]
- unit fixed and tested with Delphi XE2 (and up) 64-bit compiler
}
{$I Synopse.inc} // define HASINLINE USETYPEINFO CPU32 CPU64
{.$define USEZLIBSSE}
// if defined (only FPC+Win64), will link static\x86_64-win64sse\*.o static libraries
// from https://github.com/cloudflare/zlib (warning: SSE3/SSE4.2 CPUs only)
{.$define USECFZLIB} // https://github.com/cloudflare/zlib as external dll
{$ifdef USECFZLIB}
{$define USEEXTZLIB}
{$else}
{$ifdef FPC}
{$ifdef MSWINDOWS} // avoid link to zlib1.dll
{.$define USEPASZLIB} // paszlib makes Z_BUF_ERROR with bits = -MAX_WBITS
{$ifdef Win32}
{.$define USEZLIBSSE} // SynZLibSSE static .o files for FPC + Win32 fails
{$endif}
{$ifdef Win64}
{.$define USEEXTZLIB} // use zlib-64.dll as in \fpc-win64 sub-folder
{$endif}
{$else}
// will use zlib.so under Linux/Posix
{$ifdef ANDROID}
{$define USEPASZLIB} // Alf: problem with external zlib.so under Android
{$else}
{$define USEEXTZLIB}
{$endif}
{$endif}
{$else}
{$undef USEZLIBSSE} // Delphi linker is buggy as hell
{$ifndef USEEXTZLIB} // define USEEXTZLIB for the project for better performance
{$ifdef MSWINDOWS}
{$ifdef Win32}
{$define USEINLINEASM}
// if defined, we use a special inlined asm version for uncompress:
// seems 50% faster than BC++ generated .obj, and is 3KB smaller in code size
{$endif}
{$ifdef Win64}
{$define USEDELPHIZLIB} // System.ZLib is (much) slower, but static
{.$define USEEXTZLIB} // use faster zlib-64.dll as in \fpc-win64 sub-folder
{$endif}
{$else}
{$define USEEXTZLIB} // e.g. for Kylix
{$endif}
{$endif USEEXTZLIB}
{$endif}
{$endif USECFZLIB}
interface
uses
{$ifdef MSWINDOWS}
Windows,
{$else}
{$ifdef KYLIX3}
LibC,
{$else}
{$ifndef ANDROID}
clocale,
{$endif}
{$endif}
Types,
{$endif}
{$ifdef USEPASZLIB}
zbase,
paszlib,
{$endif}
SysUtils,
Classes;
type
/// the format used for storing data
TSynZipCompressorFormat = (szcfRaw, szcfZip, szcfGZ);
{$ifdef DELPHI5OROLDER}
type // Delphi 5 doesn't have those base types defined :(
PInteger = ^Integer;
PCardinal = ^Cardinal;
IntegerArray = array[0..$effffff] of Integer;
const
PathDelim = '\';
soCurrent = soFromCurrent;
function IncludeTrailingPathDelimiter(const FileName: TFileName): TFileName;
{$endif}
/// in-memory ZLib DEFLATE compression
// - by default, will use the deflate/.zip header-less format, but you may set
// ZlibFormat=true to add an header, as expected by zlib (and pdf)
function CompressMem(src, dst: pointer; srcLen, dstLen: integer;
CompressionLevel: integer=6; ZlibFormat: Boolean=false) : integer;
/// in-memory ZLib INFLATE decompression
// - by default, will use the deflate/.zip header-less format, but you may set
// ZlibFormat=true to add an header, as expected by zlib (and pdf)
function UnCompressMem(src, dst: pointer; srcLen, dstLen: integer; ZlibFormat: Boolean=false) : integer;
/// ZLib DEFLATE compression from memory into a stream
// - by default, will use the deflate/.zip header-less format, but you may set
// ZlibFormat=true to add an header, as expected by zlib (and pdf)
function CompressStream(src: pointer; srcLen: integer;
tmp: TStream; CompressionLevel: integer=6; ZlibFormat: Boolean=false;
TempBufSize: integer=0): cardinal;
/// ZLib INFLATE decompression from memory into a stream
// - return the number of bytes written into the stream
// - if checkCRC if not nil, it will contain the crc32; if aStream is nil, it
// will only calculate the crc of the the uncompressed memory block
// - by default, will use the deflate/.zip header-less format, but you may set
// ZlibFormat=true to add an header, as expected by zlib (and pdf)
function UnCompressStream(src: pointer; srcLen: integer; tmp: TStream;
checkCRC: PCardinal; ZlibFormat: Boolean=false; TempBufSize: integer=0): cardinal;
type
{$ifdef HASCODEPAGE}
ZipString = type RawByteString;
{$else}
/// define a raw storage string type, used for data buffer management
ZipString = type AnsiString;
{$endif}
{$ifdef FPC}
ZipPtrUInt = PtrUInt;
{$else}
/// as available in FPC
ZipPtrUInt = {$ifdef CPU64}NativeUInt{$else}cardinal{$endif};
{$endif}
/// ZLib INFLATE decompression from memory into a AnsiString (ZipString) variable
// - return the number of bytes written into the string
// - if checkCRC if not nil, it will contain the crc32; if aStream is nil, it
// will only calculate the crc of the the uncompressed memory block
// - by default, will use the deflate/.zip header-less format, but you may set
// ZlibFormat=true to add an header, as expected by zlib (and pdf)
function UnCompressZipString(src: pointer; srcLen: integer; out data: ZipString;
checkCRC: PCardinal; ZlibFormat: Boolean; TempBufSize: integer=0): cardinal;
/// compress some data, with a proprietary format (including CRC)
function CompressString(const data: ZipString; failIfGrow: boolean = false;
CompressionLevel: integer=6) : ZipString;
/// uncompress some data, with a proprietary format (including CRC)
// - return '' in case of a decompression failure
function UncompressString(const data: ZipString) : ZipString;
/// (un)compress a data content using the gzip algorithm
// - as expected by THttpSocket.RegisterCompress
// - will use internaly a level compression of 1, i.e. fastest available (content
// of 4803 bytes is compressed into 700, and time is 440 us instead of 220 us)
function CompressGZip(var DataRawByteString; Compress: boolean): AnsiString;
/// (un)compress a data content using the Deflate algorithm (i.e. "raw deflate")
// - as expected by THttpSocket.RegisterCompress
// - will use internaly a level compression of 1, i.e. fastest available (content
// of 4803 bytes is compressed into 700, and time is 440 us instead of 220 us)
// - deflate content encoding is pretty inconsistent in practice, so slightly
// slower CompressGZip() is preferred - http://stackoverflow.com/a/9186091
function CompressDeflate(var DataRawByteString; Compress: boolean): AnsiString;
/// (un)compress a data content using the zlib algorithm
// - as expected by THttpSocket.RegisterCompress
// - will use internaly a level compression of 1, i.e. fastest available (content
// of 4803 bytes is compressed into 700, and time is 440 us instead of 220 us)
// - zlib content encoding is pretty inconsistent in practice, so slightly
// slower CompressGZip() is preferred - http://stackoverflow.com/a/9186091
function CompressZLib(var DataRawByteString; Compress: boolean): AnsiString;
/// low-level check of the code returned by the ZLib library
function Check(const Code: Integer; const ValidCodes: array of Integer;
const Context: string=''): integer;
type
PCardinalArray = ^TCardinalArray;
TCardinalArray = array[0..(MaxLongint div SizeOf(cardinal))-1] of cardinal;
/// just hash aString with CRC32 algorithm
// - crc32 is better than adler32 for short strings
function CRC32string(const aString: ZipString): cardinal;
type
/// exception raised internaly in case of Zip errors
ESynZipException = class(Exception);
{$ifdef USEZLIBSSE} // statically linked with new 64-bit TZStream
type
TZLong = ZipPtrUint;
TZCRC = Int64;
{$else}
{$ifdef USECFZLIB} // dynamically linked with new 64-bit TZStream
type
TZLong = ZipPtrUint;
TZCRC = Int64;
const
{$ifdef WIN64}
libz='zlibcf64.dll';
{$else}
libz='zlibcf32.dll';
{$endif}
{$else}
{$ifdef USEEXTZLIB}
{$ifdef MSWINDOWS} // dynamically linked with old 32-bit TZStream
type
TZLong = cardinal;
TZCRC = cardinal;
const
{$ifdef WIN2}
libz='zlib-32.dll'; // as available in \fpc-win32 sub-folder
{$endif}
{$ifdef WIN64}
libz='zlib-64.dll'; // as available in \fpc-win64 sub-folder
{$endif}
{$endif MSWINDOWS}
{$ifdef KYLIX3}
type
TZLong = cardinal;
TZCRC = cardinal;
const
libz = 'libz.so.1';
{$else}
{$ifdef UNIX} // dynamically linked with new 64-bit TZStream
type
TZLong = ZipPtrUint;
TZCRC = Int64;
const
libz='z';
{$linklib libz}
{$endif UNIX}
{$endif KYLIX3}
{$else} // statically linked with old 32-bit TZStream
type
TZLong = cardinal;
TZCRC = cardinal;
{$endif USEEXTZLIB}
{$endif USECFZLIB}
{$endif USEZLIBSSE}
type
{$ifdef USEPASZLIB}
TZStream = z_stream;
{$else}
/// the internal memory structure as expected by the ZLib library
TZStream = record
next_in: PAnsiChar;
avail_in: cardinal;
total_in: TZLong;
next_out: PAnsiChar;
avail_out: cardinal;
total_out: TZLong;
msg: PAnsiChar;
state: pointer;
zalloc: pointer;
zfree: pointer;
opaque: pointer;
data_type: integer;
adler: TZLong;
reserved: TZLong;
end;
{$endif USEPASZLIB}
/// initialize the internal memory structure as expected by the ZLib library
procedure StreamInit(var Stream: TZStream); overload;
/// prepare the internal memory structure as expected by the ZLib library for compression
function DeflateInit(var Stream: TZStream; CompressionLevel: integer;
ZlibFormat: Boolean): Boolean; overload;
// don't know why using objects below produce an Internal Error DT5830
// under Delphi 2009 Update 3 !!!!!
// -> see http://qc.embarcadero.com/wc/qcmain.aspx?d=79792
// it seems that this compiler doesn't like to compile packed objects,
// but all other versions (including Delphi 2009 Update 2) did
// -> do Codegear knows about regression tests?
type
{$A-} { force packed object (not allowed under Delphi 2009) }
PFileInfo = ^TFileInfo;
/// generic file information structure, as used in .zip file format
// - used in any header, contains info about following block
{$ifndef UNICODE}
TFileInfo = object
{$else}
TFileInfo = record
{$endif}
neededVersion : word; // $14
flags : word; // 0
zzipMethod : word; // 0=Z_STORED 8=Z_DEFLATED 12=BZ2 14=LZMA
zlastMod : integer; // time in dos format
zcrc32 : dword; // crc32 checksum of uncompressed data
zzipSize : dword; // size of compressed data
zfullSize : dword; // size of uncompressed data
nameLen : word; // length(name)
extraLen : word; // 0
function SameAs(aInfo: PFileInfo): boolean;
function AlgoID: integer; // 1..15 (1=SynLZ e.g.) from flags
procedure SetAlgoID(Algorithm: integer);
function GetUTF8FileName: boolean;
procedure SetUTF8FileName;
procedure UnSetUTF8FileName;
end;
/// directory file information structure, as used in .zip file format
// - used at the end of the zip file to recap all entries
TFileHeader = {$ifdef UNICODE}record{$else}object{$endif}
signature : dword; // $02014b50 PK#1#2
madeBy : word; // $14
fileInfo : TFileInfo;
commentLen : word; // 0
firstDiskNo : word; // 0
intFileAttr : word; // 0 = binary; 1 = text
extFileAttr : dword; // dos file attributes
localHeadOff : dword; // @TLocalFileHeader
function IsFolder: boolean; {$ifdef HASINLINE}inline;{$endif}
procedure Init;
end;
PFileHeader = ^TFileHeader;
/// internal file information structure, as used in .zip file format
// - used locally inside the file stream, followed by the name and then the data
TLocalFileHeader = {$ifdef UNICODE}record{$else}object{$endif}
signature : dword; // $04034b50 PK#3#4
fileInfo : TFileInfo;
function LocalData: PAnsiChar;
end;
PLocalFileHeader = ^TLocalFileHeader;
/// last header structure, as used in .zip file format
// - this header ends the file and is used to find the TFileHeader entries
TLastHeader = record
signature : dword; // $06054b50 PK#5#6
thisDisk : word; // 0
headerDisk : word; // 0
thisFiles : word; // 1
totalFiles : word; // 1
headerSize : dword; // sizeOf(TFileHeaders + names)
headerOffset : dword; // @TFileHeader
commentLen : word; // 0
end;
PLastHeader = ^TLastHeader;
{$A+}
const
ZLIB_VERSION = '1.2.3';
ZLIB_VERNUM = $1230;
Z_NO_FLUSH = 0;
Z_PARTIAL_FLUSH = 1;
Z_SYNC_FLUSH = 2;
Z_FULL_FLUSH = 3;
Z_FINISH = 4;
Z_BLOCK = 5;
Z_OK = 0;
Z_STREAM_END = 1;
Z_NEED_DICT = 2;
Z_ERRNO = -1;
Z_STREAM_ERROR = -2;
Z_DATA_ERROR = -3;
Z_MEM_ERROR = -4;
Z_BUF_ERROR = -5;
Z_VERSION_ERROR = -6;
Z_NO_COMPRESSION = 0;
Z_BEST_SPEED = 1;
Z_BEST_COMPRESSION = 9;
Z_DEFAULT_COMPRESSION = -1;
Z_FILTERED = 1;
Z_HUFFMAN_ONLY = 2;
Z_RLE = 3;
Z_FIXED = 4;
Z_DEFAULT_STRATEGY = 0;
Z_BINARY = 0;
Z_ASCII = 1;
Z_UNKNOWN = 2;
Z_STORED = 0;
Z_DEFLATED = 8;
MAX_WBITS = 15; // 32K LZ77 window
DEF_MEM_LEVEL = 8;
Z_NULL = 0;
{$ifdef USEPASZLIB}
function deflateInit2_(var strm: TZStream;
level, method, windowBits, memLevel, strategy: integer;
version: PAnsiChar; stream_size: integer): integer;
function deflate(var strm: TZStream; flush: integer): integer;
function deflateEnd(var strm: TZStream): integer;
function inflateInit2_(var strm: TZStream; windowBits: integer;
version: PAnsiChar; stream_size: integer): integer;
function inflate(var strm: TZStream; flush: integer): integer;
function inflateEnd(var strm: TZStream): integer;
function adler32(adler: cardinal; buf: PAnsiChar; len: cardinal): cardinal;
function crc32(crc: cardinal; buf: PAnsiChar; len: cardinal): cardinal;
function get_crc_table: pointer;
{$else}
{ our very own short implementation of ZLibH }
{$ifdef USEINLINEASM}
function deflateInit2_(var strm: TZStream;
level, method, windowBits, memLevel, strategy: integer;
version: PAnsiChar; stream_size: integer): integer;
function deflate(var strm: TZStream; flush: integer): integer;
function deflateEnd(var strm: TZStream): integer;
function inflateInit2_(var strm: TZStream; windowBits: integer;
version: PAnsiChar; stream_size: integer): integer; stdcall;
function inflate(var strm: TZStream; flush: integer): integer; stdcall;
function inflateEnd(var strm: TZStream): integer; stdcall;
function adler32(adler: cardinal; buf: PAnsiChar; len: cardinal): cardinal;
function crc32(crc: cardinal; buf: PAnsiChar; len: cardinal): cardinal;
function get_crc_table: pointer;
{$else USEINLINEASM}
function deflate(var strm: TZStream; flush: integer): integer; cdecl;
function deflateEnd(var strm: TZStream): integer; cdecl;
function inflate(var strm: TZStream; flush: integer): integer; cdecl;
function inflateEnd(var strm: TZStream): integer; cdecl;
function adler32(adler: TZCRC; buf: PAnsiChar; len: cardinal): TZCRC; cdecl;
function crc32(crc: TZCRC; buf: PAnsiChar; len: cardinal): TZCRC; cdecl;
function deflateInit_(var strm: TZStream; level: integer;
version: PAnsiChar; stream_size: integer): integer; cdecl;
function inflateInit_(var strm: TZStream;
version: PAnsiChar; stream_size: integer): integer; cdecl;
function deflateInit2_(var strm: TZStream;
level, method, windowBits, memLevel, strategy: integer;
version: PAnsiChar; stream_size: integer): integer; cdecl;
function inflateInit2_(var strm: TZStream; windowBits: integer;
version: PAnsiChar; stream_size: integer): integer; cdecl;
function get_crc_table: pointer; cdecl;
{$endif USEINLINEASM}
{$endif USEPASZLIB}
type
/// simple wrapper class to decompress a .gz file into memory or stream/file
{$ifdef UNICODE}TGZRead = record{$else}TGZRead = object{$endif}
private
comp, zsdest: pointer;
zscrc: cardinal;
zssize, zscode: integer;
zs: TZStream;
public
complen, uncomplen: integer;
crc32: cardinal;
unixmodtime: cardinal;
fname, fcomment, extra: PAnsiChar;
/// read and validate the .gz header
// - on success, return true and fill complen/uncomplen/crc32c properties
function Init(gz: PAnsiChar; gzLen: integer): boolean;
/// uncompress the .gz content into a memory buffer
function ToMem: ZipString;
/// uncompress the .gz content into a stream
function ToStream(stream: TStream; tempBufSize: integer=0): boolean;
/// uncompress the .gz content into a file
function ToFile(const filename: TFileName; tempBufSize: integer=0): boolean;
/// allow low level iterative decompression using an internal TZStream structure
function ZStreamStart(dest: pointer; destsize: integer): boolean;
/// will uncompress into dest/destsize buffer as supplied to ZStreamStart
// - return the number of bytes uncompressed, 0 if the input stream is finished
function ZStreamNext: integer;
/// any successfull call to ZStreamStart should always run ZStreamDone
// - return true if the crc and the uncompressed size are ok
function ZStreamDone: boolean;
end;
/// uncompress a .gz file content
// - return '' if the .gz content is invalid (e.g. bad crc)
function GZRead(gz: PAnsiChar; gzLen: integer): ZipString;
/// compress a file content into a new .gz file
// - will use TSynZipCompressor for minimal memory use during file compression
function GZFile(const orig, destgz: TFileName; CompressionLevel: Integer=6): boolean;
const
/// operating-system dependent wildchar to match all files in a folder
ZIP_FILES_ALL = {$ifdef MSWINDOWS}'*.*'{$else}'*'{$endif};
type
/// a simple TStream descendant for compressing data into a stream
// - this simple version don't use any internal buffer, but rely
// on Zip library buffering system
// - the version in SynZipFiles is much more powerfull, but this one
// is sufficient for most common cases (e.g. for on the fly .gz backup)
TSynZipCompressor = class(TStream)
private
fInitialized: Boolean;
fDestStream: TStream;
fStrm: TZStream;
fCRC: Cardinal;
fGZFormat: boolean;
fBufferOut: array[word] of byte; // a 64 KB buffer
function FlushBufferOut: integer;
public
/// create a compression stream, writting the compressed data into
// the specified stream (e.g. a file stream)
constructor Create(outStream: TStream; CompressionLevel: Integer;
Format: TSynZipCompressorFormat = szcfRaw);
/// release memory
destructor Destroy; override;
/// this method will raise an error: it's a compression-only stream
function Read(var Buffer; Count: Longint): Longint; override;
/// add some data to be compressed
function Write(const Buffer; Count: Longint): Longint; override;
/// used to return the current position, i.e. the real byte written count
// - for real seek, this method will raise an error: it's a compression-only stream
function Seek(Offset: Longint; Origin: Word): Longint; override;
/// the number of byte written, i.e. the current uncompressed size
function SizeIn: cardinal;
/// the number of byte sent to the destination stream, i.e. the current
// compressed size
function SizeOut: cardinal;
/// write all pending compressed data into outStream
procedure Flush;
/// the current CRC of the written data, i.e. the uncompressed data CRC
property CRC: cardinal read fCRC;
end;
/// stores an entry of a file inside a .zip archive
TZipEntry = record
/// the information of this file, as stored locally in the .zip archive
// - note that infoLocal^.zzipSize/zfullSize/zcrc32 may be 0 if the info
// was stored in a "data descriptor" block after the data: in this case,
// you should use TZipRead.RetrieveFileInfo() instead of this structure
infoLocal: PFileInfo;
/// the information of this file, as stored at the end of the .zip archive
// - may differ from infoLocal^ content, depending of the zipper tool used
infoDirectory: PFileHeader;
/// points to the compressed data in the .zip archive, mapped in memory
data: PAnsiChar;
/// name of the file inside the .zip archive
// - not ASCIIZ: length = infoLocal.nameLen
storedName: PAnsiChar;
/// name of the file inside the .zip archive
// - converted from DOS/OEM or UTF-8 into generic (Unicode) string
zipName: TFileName;
end;
/// read-only access to a .zip archive file
// - can open directly a specified .zip file (will be memory mapped for fast access)
// - can open a .zip archive file content from a resource (embedded in the executable)
// - can open a .zip archive file content from memory
TZipRead = class
private
buf: PByteArray;
FirstFileHeader: PFileHeader;
ReadOffset: cardinal;
{$ifdef MSWINDOWS}
file_, map: ZipPtrUint;
{$else}
file_: THandle;
mapSize: cardinal;
{$endif}
procedure UnMap;
function UnZipStream(aIndex: integer; const aInfo: TFileInfo; aDest: TStream): boolean;
public
/// the number of files inside a .zip archive
Count: integer;
/// the files inside the .zip archive
Entry: array of TZipEntry;
/// open a .zip archive file as Read Only
constructor Create(const aFileName: TFileName; ZipStartOffset: cardinal=0;
Size: cardinal=0); overload;
/// open a .zip archive file directly from a resource
constructor Create(Instance: THandle; const ResName: string; ResType: PChar); overload;
/// open a .zip archive file from its File Handle
constructor Create(aFile: THandle; ZipStartOffset: cardinal=0;
Size: cardinal=0); overload;
/// open a .zip archive file directly from memory
constructor Create(BufZip: PByteArray; Size: cardinal); overload;
/// release associated memory
destructor Destroy; override;
/// get the index of a file inside the .zip archive
function NameToIndex(const aName: TFileName): integer;
/// uncompress a file stored inside the .zip archive into memory
function UnZip(aIndex: integer): ZipString; overload;
/// uncompress a file stored inside the .zip archive into a stream
function UnZip(aIndex: integer; aDest: TStream): boolean; overload;
/// uncompress a file stored inside the .zip archive into a destination directory
function UnZip(aIndex: integer; const DestDir: TFileName;
DestDirIsFileName: boolean=false): boolean; overload;
/// uncompress a file stored inside the .zip archive into memory
function UnZip(const aName: TFileName): ZipString; overload;
/// uncompress a file stored inside the .zip archive into a destination directory
function UnZip(const aName, DestDir: TFileName;
DestDirIsFileName: boolean=false): boolean; overload;
/// uncompress all fields stored inside the .zip archive into the supplied
// destination directory
// - returns -1 on success, or the index in Entry[] of the failing file
function UnZipAll(DestDir: TFileName): integer;
/// retrieve information about a file
// - in some cases (e.g. for a .zip created by latest Java JRE),
// infoLocal^.zzipSize/zfullSize/zcrc32 may equal 0: this method is able
// to retrieve the information either from the ending "central directory",
// or by searching the "data descriptor" block
// - returns TRUE if the Index is correct and the info was retrieved
// - returns FALSE if the information was not successfully retrieved
function RetrieveFileInfo(Index: integer; var Info: TFileInfo): boolean;
end;
/// abstract write-only access for creating a .zip archive
TZipWriteAbstract = class
protected
fAppendOffset: cardinal;
fMagic: cardinal;
function InternalAdd(const zipName: TFileName; Buf: pointer; Size: integer): cardinal;
function InternalWritePosition: cardinal; virtual; abstract;
procedure InternalWrite(const buf; len: cardinal); virtual; abstract;
public
/// the total number of entries
Count: integer;
/// the resulting file entries, ready to be written as a .zip catalog
// - those will be appended after the data blocks at the end of the .zip file
Entry: array of record
/// the file name, as stored in the .zip internal directory
intName: ZipString;
/// the corresponding file header
fhr: TFileHeader;
end;
/// initialize the .zip archive
// - a new .zip file content is prepared
constructor Create;
/// compress (using the deflate method) a memory buffer, and add it to the zip file
// - by default, the 1st of January, 2010 is used if not date is supplied
procedure AddDeflated(const aZipName: TFileName; Buf: pointer; Size: integer;
CompressLevel: integer=6; FileAge: integer=1+1 shl 5+30 shl 9); overload;
/// add a memory buffer to the zip file, without compression
// - content is stored, not deflated
// (in that case, no deflate code is added to the executable)
// - by default, the 1st of January, 2010 is used if not date is supplied
procedure AddStored(const aZipName: TFileName; Buf: pointer; Size: integer;
FileAge: integer=1+1 shl 5+30 shl 9);
/// append a file content into the destination file
// - useful to add the initial Setup.exe file, e.g.
procedure Append(const Content: ZipString);
/// release associated memory, and close destination archive
destructor Destroy; override;
end;
/// write-only access for creating a .zip archive file
// - not to be used to update a .zip file, but to create a new one
// - update can be done manualy by using a TZipRead instance and the
// AddFromZip() method
TZipWrite = class(TZipWriteAbstract)
protected
fFileName: TFileName;
function InternalWritePosition: cardinal; override;
procedure InternalWrite(const buf; len: cardinal); override;
public
/// the associated file handle
Handle: integer;
/// initialize the .zip file
// - a new .zip file content is created
constructor Create(const aFileName: TFileName); overload;
/// initialize an existing .zip file in order to add some content to it
// - warning: AddStored/AddDeflated() won't check for duplicate zip entries
// - this method is very fast, and will increase the .zip file in-place
// (the old content is not copied, new data is appended at the file end)
// - "dummy" parameter exists only to disambiguate constructors for C++
constructor CreateFrom(const aFileName: TFileName; dummy: integer=0);
/// compress (using the deflate method) a file, and add it to the zip file
procedure AddDeflated(const aFileName: TFileName; RemovePath: boolean=true;
CompressLevel: integer=6; ZipName: TFileName=''); overload;
/// compress (using the deflate method) all files within a folder, and
// add it to the zip file
// - if Recursive is TRUE, would include files from nested sub-folders
procedure AddFolder(const FolderName: TFileName; const Mask: TFileName=ZIP_FILES_ALL;
Recursive: boolean=true; CompressLevel: integer=6);
/// add a file from an already compressed zip entry
procedure AddFromZip(const ZipEntry: TZipEntry);
/// release associated memory, and close destination file
destructor Destroy; override;
end;
/// write-only access for creating a .zip archive into a stream
TZipWriteToStream = class(TZipWriteAbstract)
protected
fDest: TStream;
function InternalWritePosition: cardinal; override;
procedure InternalWrite(const buf; len: cardinal); override;
public
/// initialize the .zip archive
// - a new .zip file content is prepared
constructor Create(aDest: TStream);
end;
/// a TSynLogArchiveEvent handler which will compress older .log files
// into .zip archive files
// - resulting file will be named YYYYMM.zip and will be located in the
// aDestinationPath directory, i.e. TSynLogFamily.ArchivePath+'\log\YYYYMM.zip'
{$ifdef MSWINDOWS}
function EventArchiveZip(const aOldLogFileName, aDestinationPath: TFileName): boolean;
{$endif}
implementation
{$ifdef USEDELPHIZLIB}
uses
ZLib;
{$endif USEDELPHIZLIB}
{$ifdef Linux}
uses
{$ifdef FPC}
SynFPCLinux,
BaseUnix;
{$else}
SynKylix;
{$endif}
{$endif Linux}
{$ifdef DELPHI5OROLDER}
function IncludeTrailingPathDelimiter(const FileName: TFileName): TFileName;
begin
result := IncludeTrailingBackslash(FileName);
end;
{$endif}
const
// those constants have +1 to avoid finding it in the exe
FIRSTHEADER_SIGNATURE_INC = $04034b50+1; // PK#3#4
LASTHEADER_SIGNATURE_INC = $06054b50+1; // PK#5#6
ENTRY_SIGNATURE_INC = $02014b50+1; // PK#1#2
{ TZipWrite }
var
EventArchiveZipWrite: TZipWrite = nil;
{$ifdef MSWINDOWS}
function EventArchiveZip(const aOldLogFileName, aDestinationPath: TFileName): boolean;
var n: integer;
begin
result := false;
if aOldLogFileName='' then
FreeAndNil(EventArchiveZipWrite) else begin
if not FileExists(aOldLogFileName) then
exit;
if EventArchiveZipWrite=nil then
EventArchiveZipWrite := TZipWrite.CreateFrom(
system.copy(aDestinationPath,1,length(aDestinationPath)-1)+'.zip');
n := EventArchiveZipWrite.Count;
EventArchiveZipWrite.AddDeflated(aOldLogFileName,True);
if (EventArchiveZipWrite.Count=n+1) and DeleteFile(aOldLogFileName) then
result := True;
end;
end;
{$endif MSWINDOWS}
function Is7BitAnsi(P: PChar): boolean;
begin
if P<>nil then
while true do
if ord(P^)=0 then
break else
if ord(P^)<=126 then
inc(P) else begin
result := false;
exit;
end;
result := true;
end;
{ TZipWriteAbstract }
constructor TZipWriteAbstract.Create;
begin
fMagic := FIRSTHEADER_SIGNATURE_INC; // +1 to avoid finding it in the exe generated code
dec(fMagic);
end;
function TZipWriteAbstract.InternalAdd(const zipName: TFileName; Buf: pointer; Size: integer): cardinal;
begin
with Entry[Count] do begin
fHr.signature := ENTRY_SIGNATURE_INC; // +1 to avoid finding it in the exe
dec(fHr.signature);
fHr.madeBy := $14;
fHr.fileInfo.neededVersion := $14;
result := InternalWritePosition;
fHr.localHeadOff := result-fAppendOffset;
{$ifndef DELPHI5OROLDER}
// Delphi 5 doesn't have UTF8Decode/UTF8Encode functions -> make 7 bit version
if Is7BitAnsi(pointer(zipName)) then begin
{$endif}
{$ifdef UNICODE}
intName := AnsiString(zipName);
{$else} // intName := zipName -> error reference count under Delphi 6
SetString(intName,PAnsiChar(pointer(zipName)),length(zipName));
{$endif}
fHr.fileInfo.UnSetUTF8FileName;
{$ifndef DELPHI5OROLDER}
end else begin
intName := UTF8Encode(WideString(zipName));
fHr.fileInfo.SetUTF8FileName;
end;
{$endif}
fHr.fileInfo.nameLen := length(intName);
InternalWrite(fMagic,sizeof(fMagic));
InternalWrite(fhr.fileInfo,sizeof(fhr.fileInfo));
InternalWrite(pointer(intName)^,fhr.fileInfo.nameLen);
end;
if Buf<>nil then begin
InternalWrite(Buf^,Size); // write stored data
inc(Count);
end;
end;
procedure TZipWriteAbstract.AddDeflated(const aZipName: TFileName; Buf: pointer;
Size, CompressLevel, FileAge: integer);
var tmp: pointer;
tmpsize: integer;
begin
if self=nil then
exit;
if Count>=length(Entry) then
SetLength(Entry,length(Entry)+20);
with Entry[Count] do begin
with fhr.fileInfo do begin
zcrc32 := SynZip.crc32(0,Buf,Size);
zfullSize := Size;
zzipMethod := Z_DEFLATED;
zlastMod := FileAge;
tmpsize := (Int64(Size)*11) div 10+12;
Getmem(tmp,tmpSize);
zzipSize := CompressMem(Buf,tmp,Size,tmpSize,CompressLevel);
InternalAdd(aZipName,tmp,zzipSize); // write stored data
Freemem(tmp);
end;
end;
end;
procedure TZipWriteAbstract.AddStored(const aZipName: TFileName; Buf: pointer;
Size, FileAge: integer);
begin
if self=nil then
exit;
if Count>=length(Entry) then