Difference between pages "Mac OS X" and "Compression"

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Apple Inc.'s Macintosh OS X (pronounced "'''OS Ten'''") is the operating system distributed with Apple computers. It includes heavily used several programs by default, including [[Apple Mail]], a web browser called [[Apple Safari | Safari]], and an [[Apple Address Book]], and [[iCal]].
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== LZ-based ==
  
== Disk image types ==
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=== Deflate/Inflate ===
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Used in:
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* [[Gzip|gzip]]
  
Mac OS X has support for various disk image types build-in, some of which are:
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=== LZNT1 ===
* read-write disk image (.dmg) some of which use the [[Raw Image Format]]
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Used in:
* [[Sparse Image format|Sparse disk image (.spareimage)]]
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* [[NTFS]]
* [[Sparse Bundle Image format|Sparse bundle disk image (.sparsebundle)]]
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* [[Windows SuperFetch Format]]
  
== Burn Folder ==
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=== LZXPRESS ===
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Used in:
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* [[Extensible Storage Engine (ESE) Database File (EDB) format]]
  
Mac OS X Burn Folder:
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=== LZXPRESS Huffman ===
<pre>
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Used in:
$NAME.fpbf
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* [[Windows SuperFetch Format]]
</pre>
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This folder normally contains [[Mac OS X Alias Files|alias files]] (similar to LNK files under Windows). Which should have the following signature.
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<pre>
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00000000  62 6f 6f 6b 00 00 00 00  6d 61 72 6b 00 00 00 00  |book....mark....|
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</pre>
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These [[Mac OS X Alias Files|alias files]] contain additional date and time values.
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Also check the following files for references to deleted .fpbf paths:
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<pre>
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/Users/$USERNAME/Library/Preferences/com.apple.finder.plist
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/Users/$USERNAME/Library/Preferences/com.apple.sidebarlists.plist
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</pre>
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Actual burning of optical media is logged in:
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<pre>
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/var/log/system.log
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/Users/$USERNAME/Library/Logs/DiscRecording.log
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/private/var/.logs_exporter/cache/Users/$USERNAME/Library/Logs/DiscRecording.log
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</pre>
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== HFS/HFS+ date and time values ==
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In HFS+ date and time values are stored in an unsigned 32-bit integer containing the number of seconds since January 1, 1904 at 00:00:00 (midnight) UTC (GMT). This is slightly different from HFS where the date and time value are stored using the local time. The maximum representable date is February 6, 2040 at 06:28:15 UTC (GMT). The date values do not account for leap seconds. They do include a leap day in every year that is evenly divisible by four. This is sufficient given that the range of representable dates does not contain 1900 or 2100, neither of which have leap days. Also see: [http://web.archive.org/web/20090214212148/http://developer.apple.com/technotes/tn/tn1150.html Technical Note TN1150 - HFS Plus Volume Format]
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Converting HFS/HFS+ date and time values with Python:
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<pre>
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import datetime
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print datetime.datetime( 1904, 1, 1 ) + datetime.timedelta( seconds=0xCBDAF25B )
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</pre>
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== Quarantine event database ==
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See [http://menial.co.uk/blog/2011/06/16/mac-quarantine-event-database/]
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Snow Leopard and earlier
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<pre>
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/Users/$USER/Library/Preferences/com.apple.LaunchServices.QuarantineEvents
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</pre>
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<pre>
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SELECT datetime(LSQuarantineTimeStamp + 978307200, "unixepoch") as LSQuarantineTimeStamp, LSQuarantineAgentName, LSQuarantineOriginURLString, LSQuarantineDataURLString from LSQuarantineEvent;
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</pre>
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Lion and later
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<pre>
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/Users/$USER/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV2
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</pre>
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== sleepimage ==
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This file is similar to the hibernation file on Windows.
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<pre>
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/private/var/vm/sleepimage
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</pre>
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Also see: [http://osxdaily.com/2010/10/11/sleepimage-mac/]
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== Package Files (.PKG) ==
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Package Files (.PKG) are XAR archives [http://en.wikipedia.org/wiki/Xar_(archiver)] that contain a cpio archive and metadata [http://s.sudre.free.fr/Stuff/Ivanhoe/FLAT.html].
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== Also see ==
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* [[MacOS Process Monitoring]]
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* [[Acquiring a MacOS System with Target Disk Mode]]
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* [[Converting Binary Plists]]
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* [[FileVault Disk Encryption]]
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* [[File Vault]]
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=== Formats ===
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* [[Basic Security Module (BSM) file format]]
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* [[Property list (plist)]]
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== External Links ==
 
== External Links ==
* [http://www.apple.com/macosx/ Official website]
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* [http://en.wikipedia.org/wiki/Lempel-Ziv Wikipedia: Lempel-Ziv]
* [http://en.wikipedia.org/wiki/OS_X Wikipedia entry on OS X]
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* [http://www.coderforlife.com/microsoft-compression-formats/ Microsoft Compression Formats]
* [http://menial.co.uk/blog/2011/06/16/mac-quarantine-event-database/ Quarantine event database]
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* [http://www2.tech.purdue.edu/cit/Courses/cit556/readings/MacForensicsCraiger.pdf Mac Forensics: Mac OS X and the HFS+ File System] by P. Craiger
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* [http://web.me.com/driley/iWeb/Previous_files/Directory_Services_Overview.pdf Mac OS X Directory Services Integration including Active Directory]
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* [http://digitalinvestigation.wordpress.com/2012/04/04/geek-post-nskeyedarchiver-files-what-are-they-and-how-can-i-use-them/ NSKeyedArchiver files – what are they, and how can I use them?]
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* [http://krypted.com/mac-os-x/command-line-alf-on-mac-os-x/ Command Line ALF on Mac OS X]
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* [http://newosxbook.com/DMG.html Demystifying the DMG File Format]
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* [https://code.google.com/p/mac-security-tips/wiki/ALL_THE_TIPS mac-security-tips]
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=== Apple Examiner ===
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* [http://www.appleexaminer.com/ The Apple Examiner]
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* [http://www.appleexaminer.com/MacsAndOS/Analysis/USBOSX/USBOSX.html USB Entries on OS X]
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* [http://www.appleexaminer.com/Downloads/MacForensics.pdf Macintosh Forensics - A Guide for the Forensically Sound Examination of a Macintosh Computer] by Ryan R. Kubasiak
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=== iCloud ===
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=== Deflate/Inflate ===
* [http://support.apple.com/kb/HT4865?viewlocale=en_US&locale=en_US iCloud: iCloud security and privacy overview]
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* [http://en.wikipedia.org/wiki/DEFLATE Wikipedia: DEFLATE]
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* [https://tools.ietf.org/html/rfc1950 RFC1950 - ZLIB Compressed Data Format Specification], by [[IETF]]
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* [https://tools.ietf.org/html/rfc1951 RFC1951 - DEFLATE Compressed Data Format Specification], by [[IETF]]
  
[[Category:Mac OS X]]
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=== LZ1 ===
[[Category:Operating systems]]
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* [http://andyh.org/LZ1.html LZ1]

Revision as of 09:56, 21 June 2014

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LZ-based

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Used in:

LZNT1

Used in:

LZXPRESS

Used in:

LZXPRESS Huffman

Used in:

External Links

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