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471
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7z Format description (2.30 Beta 25)
-----------------------------------
This file contain descrition of 7z archive format.
7z archive can contain files compressed with any method.
See "Methods.txt" for description for defined compressing methods.
Format structure Overview
-------------------------
Some fields can be optional.
Archive structure
~~~~~~~~~~~~~~~~~
SignatureHeader
[PackedStreams]
[PackedStreamsForHeaders]
[
Header
or
{
Packed Header
HeaderInfo
}
]
Header structure
~~~~~~~~~~~~~~~~
{
ArchiveProperties
AdditionalStreams
{
PackInfo
{
PackPos
NumPackStreams
Sizes[NumPackStreams]
CRCs[NumPackStreams]
}
CodersInfo
{
NumFolders
Folders[NumFolders]
{
NumCoders
CodersInfo[NumCoders]
{
ID
NumInStreams;
NumOutStreams;
PropertiesSize
Properties[PropertiesSize]
}
NumBindPairs
BindPairsInfo[NumBindPairs]
{
InIndex;
OutIndex;
}
PackedIndices
}
UnPackSize[Folders][Folders.NumOutstreams]
CRCs[NumFolders]
}
SubStreamsInfo
{
NumUnPackStreamsInFolders[NumFolders];
UnPackSizes[]
CRCs[]
}
}
MainStreamsInfo
{
(Same as in AdditionalStreams)
}
FilesInfo
{
NumFiles
Properties[]
{
ID
Size
Data
}
}
}
HeaderInfo structure
~~~~~~~~~~~~~~~~~~~~
{
(Same as in AdditionalStreams)
}
Notes about Notation and encoding
---------------------------------
7z uses little endian encoding.
7z archive format has optional headers that are marked as
[]
Header
[]
REAL_UINT64 means real UINT64.
UINT64 means real UINT64 encoded with the following scheme:
Size of encoding sequence depends from first byte:
First_Byte Extra_Bytes Value
(binary)
0xxxxxxx : ( xxxxxxx )
10xxxxxx BYTE y[1] : ( xxxxxx << (8 * 1)) + y
110xxxxx BYTE y[2] : ( xxxxx << (8 * 2)) + y
...
1111110x BYTE y[6] : ( x << (8 * 6)) + y
11111110 BYTE y[7] : y
11111111 BYTE y[8] : y
Property IDs
------------
0x00 = kEnd,
0x01 = kHeader,
0x02 = kArchiveProperties,
0x03 = kAdditionalStreamsInfo,
0x04 = kMainStreamsInfo,
0x05 = kFilesInfo,
0x06 = kPackInfo,
0x07 = kUnPackInfo,
0x08 = kSubStreamsInfo,
0x09 = kSize,
0x0A = kCRC,
0x0B = kFolder,
0x0C = kCodersUnPackSize,
0x0D = kNumUnPackStream,
0x0E = kEmptyStream,
0x0F = kEmptyFile,
0x10 = kAnti,
0x11 = kName,
0x12 = kCreationTime,
0x13 = kLastAccessTime,
0x14 = kLastWriteTime,
0x15 = kWinAttributes,
0x16 = kComment,
0x17 = kEncodedHeader,
7z format headers
-----------------
SignatureHeader
~~~~~~~~~~~~~~~
BYTE kSignature[6] = {'7', 'z', 0xBC, 0xAF, 0x27, 0x1C};
ArchiveVersion
{
BYTE Major; // now it = 0
BYTE Minor; // now it = 1
};
UINT32 StartHeaderCRC;
StartHeader
{
REAL_UINT64 NextHeaderOffset
REAL_UINT64 NextHeaderSize
UINT32 NextHeaderCRC
}
...........................
ArchiveProperties
~~~~~~~~~~~~~~~~~
BYTE NID::kArchiveProperties (0x02)
while(true)
{
BYTE PropertyType;
if (aType == 0)
break;
UINT64 PropertySize;
BYTE PropertyData[PropertySize];
}
Digests (NumStreams)
~~~~~~~~~~~~~~~~~~~~~
BYTE AllAreDefined
if (AllAreDefined == 0)
{
for(NumStreams)
BIT Defined
}
UINT32 CRCs[NumDefined]
PackInfo
~~~~~~~~~~~~
BYTE NID::kPackInfo (0x06)
UINT64 PackPos
UINT64 NumPackStreams
[]
BYTE NID::kSize (0x09)
UINT64 PackSizes[NumPackStreams]
[]
[]
BYTE NID::kCRC (0x0A)
PackStreamDigests[NumPackStreams]
[]
BYTE NID::kEnd
Folder
~~~~~~
UINT64 NumCoders;
for (NumCoders)
{
BYTE
{
0:3 DecompressionMethod.IDSize
4:
0 - IsSimple
1 - Is not simple
5:
0 - No Attributes
1 - There Are Attributes
7:
0 - Last Method in Alternative_Method_List
1 - There are more alternative methods
}
BYTE DecompressionMethod.ID[DecompressionMethod.IDSize]
if (!IsSimple)
{
UINT64 NumInStreams;
UINT64 NumOutStreams;
}
if (DecompressionMethod[0] != 0)
{
UINT64 PropertiesSize
BYTE Properties[PropertiesSize]
}
}
NumBindPairs = NumOutStreamsTotal - 1;
for (NumBindPairs)
{
UINT64 InIndex;
UINT64 OutIndex;
}
NumPackedStreams = NumInStreamsTotal - NumBindPairs;
if (NumPackedStreams > 1)
for(NumPackedStreams)
{
UINT64 Index;
};
Coders Info
~~~~~~~~~~~
BYTE NID::kUnPackInfo (0x07)
BYTE NID::kFolder (0x0B)
UINT64 NumFolders
BYTE External
switch(External)
{
case 0:
Folders[NumFolders]
case 1:
UINT64 DataStreamIndex
}
BYTE ID::kCodersUnPackSize (0x0C)
for(Folders)
for(Folder.NumOutStreams)
UINT64 UnPackSize;
[]
BYTE NID::kCRC (0x0A)
UnPackDigests[NumFolders]
[]
BYTE NID::kEnd
SubStreams Info
~~~~~~~~~~~~~~
BYTE NID::kSubStreamsInfo; (0x08)
[]
BYTE NID::kNumUnPackStream; (0x0D)
UINT64 NumUnPackStreamsInFolders[NumFolders];
[]
[]
BYTE NID::kSize (0x09)
UINT64 UnPackSizes[]
[]
[]
BYTE NID::kCRC (0x0A)
Digests[Number of streams with unknown CRC]
[]
BYTE NID::kEnd
Streams Info
~~~~~~~~~~~~
[]
PackInfo
[]
[]
CodersInfo
[]
[]
SubStreamsInfo
[]
BYTE NID::kEnd
FilesInfo
~~~~~~~~~
BYTE NID::kFilesInfo; (0x05)
UINT64 NumFiles
while(true)
{
BYTE PropertyType;
if (aType == 0)
break;
UINT64 Size;
switch(PropertyType)
{
kEmptyStream: (0x0E)
for(NumFiles)
BIT IsEmptyStream
kEmptyFile: (0x0F)
for(EmptyStreams)
BIT IsEmptyFile
kAnti: (0x10)
for(EmptyStreams)
BIT IsAntiFile
case kCreationTime: (0x12)
case kLastAccessTime: (0x13)
case kLastWriteTime: (0x14)
BYTE AllAreDefined
if (AllAreDefined == 0)
{
for(NumFiles)
BIT TimeDefined
}
BYTE External;
if(External != 0)
UINT64 DataIndex
[]
for(Definded Items)
UINT32 Time
[]
kNames: (0x11)
BYTE External;
if(External != 0)
UINT64 DataIndex
[]
for(Files)
{
wchar_t Names[NameSize];
wchar_t 0;
}
[]
kAttributes: (0x15)
BYTE AllAreDefined
if (AllAreDefined == 0)
{
for(NumFiles)
BIT AttributesAreDefined
}
BYTE External;
if(External != 0)
UINT64 DataIndex
[]
for(Definded Attributes)
UINT32 Attributes
[]
}
}
Header
~~~~~~
BYTE NID::kHeader (0x01)
[]
ArchiveProperties
[]
[]
BYTE NID::kAdditionalStreamsInfo; (0x03)
StreamsInfo
[]
[]
BYTE NID::kMainStreamsInfo; (0x04)
StreamsInfo
[]
[]
FilesInfo
[]
BYTE NID::kEnd
HeaderInfo
~~~~~~~~~~
[]
BYTE NID::kEncodedHeader; (0x17)
StreamsInfo for Encoded Header
[]
---
End of document

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Compression method IDs (3.08 beta)
----------------------------------
Each compression method in 7z has unique binary value (ID).
The length of ID in bytes is arbitrary but it can not exceed 15 bytes.
List of defined IDs
-------------------
00 - Copy
01 - Reserved
02 - Common
03 Swap
- 2 Swap2
- 4 Swap4
04 Delta (subject to change)
03 - 7z
01 - LZMA
01 - Version
03 - Branch
01 - x86
03 - BCJ
1B - BCJ2
02 - PPC
05 - BC_PPC_B (Big Endian)
03 - Alpha
01 - BC_Alpha
04 - IA64
01 - BC_IA64
05 - ARM
01 - BC_ARM
06 - M68
05 - BC_M68_B (Big Endian)
07 - ARM Thumb
01 - BC_ARMThumb
08 - reserved for SPARC
04 - PPMD
01 - Version
04 - Misc
00 - Reserved
01 - Zip
06 - Imploded
08 - Deflate
09 - Deflate64
02 - BZip
02 - BZip2
03 - Rar
01 - Rar15
02 - Rar20
03 - Rar29
04 - Arj
01 - Arj (1,2,3)
02 - Arj 4
07 - Reserved
06 - Crypto
00 -
01 - AES
0x - AES-128
4x - AES-192
8x - AES-256
x0 - ECB
x1 - CBC
x2 - CFB
x3 - OFB
07 - Reserved
0F - Reserved
F0 - Misc Ciphers (Real Ciphers without hashing algo)
F1 - Misc Ciphers (Combine)
01 - Zip
01 - Main Zip crypto algo
03 - RAR
02 -
03 - Rar29 AES-128 + (modified SHA-1)
07 - 7z
01 - AES-256 + SHA-256
07 - Hash (subject to change)
00 -
01 - CRC
02 - SHA-1
03 - SHA-256
04 - SHA-384
05 - SHA-512
F0 - Misc Hash
F1 - Misc
03 - RAR
03 - Rar29 Password Hashing (modified SHA1)
07 - 7z
01 - SHA-256 Password Hashing
---
End of document

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impose that choice.
This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
12. If the distribution and/or use of the Library is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Library under this License may add
an explicit geographical distribution limitation excluding those countries,
so that distribution is permitted only in or among countries not thus
excluded. In such case, this License incorporates the limitation as if
written in the body of this License.
13. The Free Software Foundation may publish revised and/or new
versions of the Lesser General Public License from time to time.
Such new versions will be similar in spirit to the present version,
but may differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Library
specifies a version number of this License which applies to it and
"any later version", you have the option of following the terms and
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14. If you wish to incorporate parts of the Library into other free
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NO WARRANTY
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
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WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
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FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Libraries
If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
everyone can redistribute and change. You can do so by permitting
redistribution under these terms (or, alternatively, under the terms of the
ordinary General Public License).
To apply these terms, attach the following notices to the library. It is
safest to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
<one line to give the library's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Also add information on how to contact you by electronic and paper mail.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the library, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the
library `Frob' (a library for tweaking knobs) written by James Random Hacker.
<signature of Ty Coon>, 1 April 1990
Ty Coon, President of Vice
That's all there is to it!

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Sources history of the 7-Zip
----------------------------
Version 3.11 2003-10-06
--------------------------------------
File functions support unicode strings even
on Windows 95/98/ME.
Version 3.08.02 2003-09-20
--------------------------------------
More compatible with GCC.
Version 3.08.02 beta 2003-08-20
--------------------------------------
Extracting bug in 7zExtract.cpp was fixed.
Version 3.08 beta 2003-08-19
--------------------------------------
Big source code reconstruction.
Version 2.30 Beta 32 2003-05-15
--------------------------------------
Small changes in Deflate decoder.
Version 2.30 Beta 31 2003-04-29
--------------------------------------
Common/NewHandler.cpp
HeapAlloc in (included to beta 30) was changed to malloc.
HeapAlloc worked slower in Win95/98/Me.
Version 2.30 Beta 30 2003-04-21
--------------------------------------
new file: Common/String.cpp
Common/NewHandler.* were changed
Version 2.30 Beta 29 2003-04-07
--------------------------------------
Small changes in LZMA code.
Version 2.30 Beta 28 2003-02-16
--------------------------------------
Processing anti-files was corrected.
Version 2.30 Beta 27 2003-01-24
--------------------------------------
Project/Archiver/Format/Common/ArchiveInterface.h:
new IArchiveOpenVolumeCallback interface.
Version 2.30 Beta 26 2003-01-12
--------------------------------------
SDK/Interface/PropID.h:
kpidComment now is kpidCommented
Version 2.30 Beta 25 2003-01-02
--------------------------------------
Main archive interfaces were changed.
Version 2.30 Beta 24 2002-11-01
--------------------------------------
SDK/Windows/Synchronization.h
SDK/Windows/Synchronization.cpp
- some changes.
Version 2.30 Beta 23 2002-09-07
--------------------------------------
Project/FileManager folder was added.
Notation of some source files was changed.
Version 2.30 Beta 22 2002-08-28
--------------------------------------
Project/FileManager folder was added.
Notation of some source files was changed.
Version 2.30 Beta 21 2002-07-08
--------------------------------------
Project/Compress/LZ/MatchFinder/BinTree/BinTree.h
Project/Compress/LZ/MatchFinder/BinTree/BinTreeMain.h
Project/Compress/LZ/MatchFinder/BinTree/HC.h
Project/Compress/LZ/MatchFinder/BinTree/HCMain.h
- RAM requirements for LZMA (7z) compression were reduced.
Version 2.30 Beta 20 2002-07-01
--------------------------------------
- SDK/Stream/WindowOut.h
now it uses only required memory (dictionary size).
- Project/Archiver/Resource
contains common resurces
Version 2.30 Beta 19 2002-04-11
--------------------------------------
- SDK/Archive/Rar/Handler.cpp
supporting RAR29
Version 2.30 Beta 18 2002-03-25
--------------------------------------
- SDK/Archive/Cab/MSZipDecoder.cpp
SDK/Archive/Cab/LZXDecoder.cpp:
bug with corrupted archives was fixed
- Project/Compress/LZ/MatchFinder/BinTree/BinTree.h
- Project/Compress/LZ/MatchFinder/BinTree/BinTreeMain.h
some speed optimization (using prefetching)
Version 2.30 Beta 17 2002-03-03
--------------------------------------
- ARJ suppport.
Version 2.30 Beta 16 2002-02-24
--------------------------------------
- Project/Compress/LZ/LZMA/Decoder.cpp:
Bug was fixed: LZMA could not extract more than 4 GB.
- RPM and CPIO formats.
- Project/Compress/LZ/LZMA/Encoder.*
Project/Archiver/Format/7z/OutHandler.cpp
New fast compression mode for LZMA: -m0a=0.
- New match finders for LZMA: bt4b, hc3, hc4.
Version 2.30 Beta 15 2002-02-17
--------------------------------------
- Compression ratio in LZMA was slightly improved:
Project/Compress/LZ/LZMA/Encoder.*
Project/Archiver/Format/7z/OutHandler.cpp
Version 2.30 Beta 14 2002-02-10
--------------------------------------
- Supporting multithreading for LZMA:
Project/Compress/LZ/MatchFinder/MT
- Common/String.h:
CStringBase::Replace function was fixed.
Version 2.30 Beta 13 2002-01-27
--------------------------------------
- Compress/LZ/MatchFinder/BinTree3.h:
method
- Compress/LZ/MatchFinder/BinTreemain.h:
- one VirtualAlloc array was splitted to
the for 3 arrays.
- Hash-functions were changed.
Version 2.30 Beta 12 2002-01-16
--------------------------------------
- Compress/LZ/MatchFinder/BinTreemain.h:
Compress/LZ/MatchFinder/Patricia.h:
Compress/PPM/PPMd/SubAlloc.h:
Beta 11 bugs were fixed:
- VirtualFree was used incorrectly
- checking WIN32 instead _WINDOWS.
Compress/LZ/MatchFinder/Patricia.h:
Beta 11 bug with deleting m_Hash2Descendants was fixed.
Version 2.30 Beta 11 2002-01-15
--------------------------------------
- Compress/LZ/MatchFinder/BinTreemain.h:
Compress/LZ/MatchFinder/Patricia.h:
Compress/PPM/PPMd/SubAlloc.h:
using VirtualAlloc for memory allocating
- Exlorer/ContextMenu.cpp:
Testing supporting.
CreateProcess instead WinExec
- Format/Common/IArchiveHandler.h:
Exlorer/ProxyHandler.cpp:
FAR/Plugin.cpp:
New properties names: Method, HostOS.
- Exlorer/OverwriteDialog.cpp:
FAR/OverwriteDialog.cpp:
Windows/PropVariantConversions.h
Using National time format was eliminated.
Version 2.30 Beta 10 2002-01-11
--------------------------------------
- Exlorer/ContextMenu.cpp: bug with context menu on
Windows NT4 in Unicode version was fixed.
- Format/7z/UpdateArchiveEngine.cpp: bug was fixed -
Updating in Beta 8 and 9 didn't work.
- Exlorer/CCompressDialog.cpp: history growing bug was fixed.
Version 2.30 Beta 9 2002-01-08
--------------------------------------
- SDK/Common/Vector.h: sopporting sorted object vectors .
- Lang features.
- Two new match finders: pat3h and pat4h.
- SDK/Archive/Zip/InEngine.cpp: bug was fixed.
- SDK/Windows/FileDir.cpp: function CreateComplexDirectory
was changed.

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7-Zip 3.11 Sources
------------------
7-Zip is a file archiver for Windows 95/98/ME/NT/2000/XP.
7-Zip Copyright (C) 1999-2003 Igor Pavlov.
License Info
------------
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
License notes
-------------
You can support development of 7-Zip by registering and
paying $20. As registered user, you will be able
to get technical support via e-mail support@7-zip.org.
7-Zip is free software distributed under the GNU LGPL.
If you need license with other conditions, write to support@7-zip.org.
You also can request for help in creating code based on
7-Zip's code for your custom application.
How to compile
--------------
To compile sources you need Visual C++ 6.0.
For compiling some files you also need
new Platform SDK from Microsoft' Site:
http://www.microsoft.com/msdownload/platformsdk/sdkupdate/psdk-full.htm
or
http://www.microsoft.com/msdownload/platformsdk/sdkupdate/
Notes:
------
7-Zip consists of COM modules (DLL files).
But 7-Zip doesn't use standard COM interfaces for creating objects.
Look at
7zip\UI\Client7z folder for example of using DLL files of 7-Zip.
Some DLL files can use other DLL files from 7-Zip.
If you don't like it, you must use standalone version of DLL.
To compile standalone version of DLL you must include all used parts
to project and define some defs.
For example, 7zip\Bundles\Format7z is a standalone version of 7z.dll
that works with 7z format. So you can use such DLL in your project
without additional DLL files.
Description of 7-Zip sources package
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DOC Documentation
---
7zFormat.txt - 7z format description
copying.txt - GNU LGPL license
history.txt - Sources history
Methods.txt - Compression method IDs
readme.txt - Readme file
Alien Must contains third party sources
Compress
BZip2 BZip2 compression sources from
http://sources.redhat.com/bzip2/index.html
Common Common modules
Windows Win32 wrappers
Far FAR interface wrappers
7zip
-------
Common Common modules for 7-zip
Archive 7-Zip Archive Format Plugins
--------
Common
7z
Arj
BZip2
Cab
Cpio
GZip
Rar
Rpm
Split
Tar
Zip
Bundle Modules that are bundles of other modules
------
Alone 7za.exe: Standalone version of 7z
SFXCon 7zCon.sfx: Console 7z SFX module
SFXWin 7z.sfx: Windows 7z SFX module
SFXSetup 7zS.sfx: Windows 7z SFX module for Installers
Format7z 7za.dll: Standalone version of 7z.dll
UI
--
Agent Intermediary modules for FAR plugin and Explorer plugin
Console 7z.exe Console version
Explorer Explorer plugin
Resource Resources
Far FAR plugin
Client7z Test application for 7za.dll
Compress
--------
BZip2 BZip2 compressor
Original Download BZip2 compression sources from
http://sources.redhat.com/bzip2/index.html
to that folder.
Branch Branch converter
ByteSwap Byte Swap converter
Copy Copy coder
Deflate
Implode
Arj
LZMA
PPMd Dmitry Shkarin's PPMdH with small changes.
LZ Lempel - Ziv
MT Multi Thread Match finder
BinTree Match Finder based on Binary Tree
Patricia Match Finder based on Patricia algoritm
HashChain Match Finder based on Hash Chains
Crypto Crypto modules
------
7zAES Cipher for 7z
AES AES Cipher
Rar20 Cipher for Rar 2.0
RarAES Cipher for Rar 3.0
Zip Cipher for Zip
FileManager File Manager
---
Igor Pavlov
http://www.7-zip.org
support@7-zip.org
---
End of document