Difference between pages "Windows SuperFetch Format" and "Libagdb"

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(Created page with "{{Infobox_Software | name = libagdb | maintainer = Joachim Metz | os = Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, Windows | genre = {{Analy...")
 
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{{Infobox_Software |
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  name = libagdb |
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  maintainer = [[Joachim Metz]] |
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  os = [[Linux]], [[FreeBSD]], [[NetBSD]], [[OpenBSD]], [[Mac OS X]], [[Windows]] |
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  genre = {{Analysis}} |
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  license = {{LGPL}} |
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  website = [http://code.google.com/p/libagdb/ code.google.com/p/libagdb/] |
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}}
  
SuperFetch, is a memory management scheme that enhances the least-recently accessed approach with historical information and proactive memory management. [http://technet.microsoft.com/en-us/magazine/2007.03.vistakernel.aspx]
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The '''libagdb''' package contains a library and applications to read the [[Windows SuperFetch Format]].
  
<b>Note that the following format specification are incomplete.</b>
+
Note that the project currently only provides documentation.
  
== SuperFetch DB files ==
+
== History ==  
The <tt>Ag*.db</tt> files are of the SuperFetch file format. E.g.
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<pre>
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AgAppLaunch.db
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AgCx_SC*.db
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AgGlFaultHistory.db
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AgGlFgAppHistory.db
+
AgGlGlobalHistory.db
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AgGlUAD_%SID%.db
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AgGlUAD_P_%SID%.db
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AgRobust.db
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</pre>
+
  
The SuperFetch DB files can be stored in uncompressed or compressed form, where different version of Windows use different compressed forms:
+
Libagdb was created by [[Joachim Metz]] in 2014.
* Compressed SuperFetch DB - MEMO file format; Windows Vista
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* Compressed SuperFetch DB - MEM0 file format; Windows  7
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* Compressed SuperFetch DB - MAM file format; Windows 8
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=== Compressed SuperFetch DB - MEMO file format ===
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The MEM file consists of:
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* file header
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* compressed blocks
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This format uses the LZNT1 compression method
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+
==== File header ====
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The file header is 84 bytes of size and consists of:
+
{| class="wikitable"
+
|-
+
! Offset
+
! Size
+
! Value
+
! Description
+
|-
+
| 0
+
| 4
+
| "MEMO" (0x4d, 0x45, 0x4d, 0x4f)
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| Signature
+
|-
+
| 4
+
| 4
+
|
+
| Uncompressed (total) data size
+
|-
+
|}
+
 
+
==== Compressed blocks ====
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The compressed block size is the chunk data size, which is part of the LZNT1 compressed data, + 2 bytes for the size of the chunk header itself.
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The uncompressed block size is 4096 (0x1000) or the remaining uncompressed data size for the last block.
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=== Compressed SuperFetch DB - MEM0 file format ===
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The MEM file consists of:
+
* file header
+
* compressed blocks
+
 
+
This format uses the LZXPRESS Huffman compression method
+
 
+
==== File header ====
+
The file header is 8 bytes of size and consists of:
+
{| class="wikitable"
+
|-
+
! Offset
+
! Size
+
! Value
+
! Description
+
|-
+
| 0
+
| 4
+
| "MEM0" (0x4d, 0x45, 0x4d, 0x30)
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| Signature
+
|-
+
| 4
+
| 4
+
|
+
| Uncompressed (total) data size
+
|-
+
|}
+
 
+
==== Compressed blocks ====
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The file header is followed by compressed blocks:
+
{| class="wikitable"
+
|-
+
! Offset
+
! Size
+
! Value
+
! Description
+
|-
+
| 0
+
| 4
+
|
+
| Compressed data size
+
|-
+
| 4
+
| ...
+
|
+
| Compressed data
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|-
+
|}
+
 
+
The uncompressed block size is 65536 (0x10000) or the remaining uncompressed data size for the last block.
+
 
+
=== Compressed SuperFetch DB - MAM file format ===
+
The MAM file consists of:
+
* file header
+
* compressed blocks
+
 
+
This format uses the LZXPRESS Huffman compression method.
+
 
+
==== File header ====
+
The file header is 12 bytes of size and consists of:
+
{| class="wikitable"
+
|-
+
! Offset
+
! Size
+
! Value
+
! Description
+
|-
+
| 0
+
| 4
+
| "MAM\x84" (0x4d, 0x41, 0x4d, 0x84)
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| Signature
+
|-
+
| 4
+
| 4
+
|
+
| Uncompressed (total) data size
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|-
+
| 8
+
| 4
+
|
+
| Unknown (checksum?)
+
|-
+
|}
+
 
+
==== Compressed blocks ====
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The uncompressed block size is 65536 (0x10000) or the remaining uncompressed data size for the last block.
+
 
+
Note the LZExpress Huffman variant used differs from the one used in the MEM0 format. This variant can refer to uncompressed data stored in the previous compressed block. The compressed blocks are essentially a single compressed stream.
+
 
+
=== Uncompressed SuperFetch DB format ===
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<b>TODO</b>
+
 
+
==== File header ====
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<b>TODO</b>
+
 
+
{| class="wikitable"
+
|-
+
! Offset
+
! Size
+
! Value
+
! Description
+
|-
+
| 0
+
| 4
+
| 0x0000000e
+
| Unknown (Database type or signature?)
+
|-
+
| 4
+
| 4
+
|
+
| Uncompressed (total) data size
+
|-
+
|}
+
== TRX files ==
+
The <tt>Ag*.db.trx</tt> files are of the TRX file format. E.g.
+
<pre>
+
AgCx_SC*.db.trx
+
</pre>
+
 
+
<b>Note that the following format specification is incomplete.</b>
+
 
+
=== File header ===
+
The file header is variable of size and consists of:
+
{| class="wikitable"
+
|-
+
! Offset
+
! Size
+
! Value
+
! Description
+
|-
+
| 0
+
| 4
+
| 1
+
| Unknown (Version?)
+
|-
+
| 4
+
| 4
+
|
+
| Unknown
+
|-
+
| 8
+
| 4
+
|
+
| File size
+
|-
+
| 12
+
| 4
+
|
+
| Maximum number of records (of the record offsets array)
+
|-
+
| 16
+
| 4
+
|
+
| Number of records
+
|-
+
| 20
+
| ...
+
|
+
| Record offsets array, where the record offset is a 32-bit integer. Unused record offset are set to 0.
+
|-
+
|}
+
 
+
=== Record ===
+
<b>TODO describe</b>
+
 
+
== See Also ==
+
* [[SuperFetch]]
+
  
 
== External Links ==
 
== External Links ==
* [http://technet.microsoft.com/en-us/magazine/2007.03.vistakernel.aspx Inside the Windows Vista Kernel: Part 2], by [[Mark Russinovich]], March 2007
 
* [http://blog.rewolf.pl/blog/?p=214 Windows SuperFetch file format – partial specification], by ReWolf, October 5, 2011
 
* [https://googledrive.com/host/0B3fBvzttpiiSWFFkSTBOUHdjOVU/Windows%20SuperFetch%20(DB)%20format.pdf Windows SuperFetch database format], by the [[libagdb| libagdb project]], April 2014
 
  
[[Category:File Formats]]
+
* [https://code.google.com/p/libagdb/ Project site]

Revision as of 00:42, 12 May 2014

libagdb
Maintainer: Joachim Metz
OS: Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, Windows
Genre: Analysis
License: LGPL
Website: code.google.com/p/libagdb/

The libagdb package contains a library and applications to read the Windows SuperFetch Format.

Note that the project currently only provides documentation.

History

Libagdb was created by Joachim Metz in 2014.

External Links