Talk:7z
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[edit] Headline text
Okay, what the heck is Solid compressing? I'm going to take it out of the main page just now, and we can put it back when I have some idea what it is. There's probably a better english-language phrase already in use. -- Finlay McWalter 23:41, 10 Nov 2003 (UTC)
- A FAQ of solid archives: http://pot-pourri.fltr.ucl.ac.be/files/ARCH/RAR_FAQ.TXT whkoh 03:59, Dec 1, 2003 (UTC)
I made and linked to a new page on solid compression. The term is also used in reference to the RAR format, so it's best to have it in one place. Graue 23:49, 14 May 2005 (UTC)
[edit] What are "branch targets"
The article mentions: "Compressors which encode branch targets to improve ..."
What is a branch target?
This refers to machine instructions. A particular type of instruction tells the CPU to 'branch' or 'jump' to another address based upon some condition. The specified address ('target') can be absolute or relative (to the address of the current instruction). The terminology "branch" here most likely also includes unconditional jump instructions.
How does this impact compression? Well, for example, if there are 20 branch instructions branching to the same address and the address specification is absolute, this repeated pattern can be easily compressed. However, if the address specification is relative, no pattern is obvious. I suspect that 'encoding branch target [addresses]' transforms the data stream so that relative addresses form patterns. -- Rick Jones Aug 07, 2005.
- This has apparently been "acted on". ¦ Reisio 15:47, 29 October 2005 (UTC)
[edit] format documentation?
Is 7z format documented anywhere? The 7-zip web site has a page of general info about the format (i.e. a brief list of supported features) but I mean an actual specification that an implementer could use. Thanks. Phr (talk) 23:36, 19 July 2006 (UTC)
[edit] Possible Error?
I don't believe winzip supports 7z as listed. --68.82.65.116 01:14, 23 July 2006 (UTC)
Agreed, I just tried the latest winzip version (10?) and it had no clue what 7z was. --68.95.161.14 23:56, 5 August 2006 (UTC)
[edit] Pre-processor
"...converted from the machine language "jump 1655 bytes backwards" style notation to normalized "jump to address 5554" style notation."
Would this not break the CRC self check build into some applications? —The preceding unsigned comment was added by 194.98.128.33 (talk) 13:09, 23 February 2007 (UTC).
- I don't know for sure, but I'd guess the process is reversed WHEN the files are extracted from the archive?
