Topic: Layout optimization
started by: mionica
Posted by mionica on May 31 2006,14:04
I don't know how you do duplicates search, but I assume you use the good old (fileSize+fileMD5) mapping technique.The problem is, if I add a file to an image in which it already exists (in a different folder, or by another name), 'Optimize' won't work. This is surely understandable, since 'Optimize' only 'looks' at the after-last-save added file.
Options to use an associated file list containing (lba, size, md5) would be really nice, since it would allow for real, full-scale optimization. That would be, 'generate'/'import'.
However, in this case, the 'import' thing may lead to really unfortunate mistakes on users' behalf, tough it may be a powerful function for powerful optimization-addicted users (as I am).
There would be another aproach though, however applicable only if the image should reside on an NTFS partition (but, btw, this is really common): use an ADS to store/retrieve this (meta)data, say D:/ISO/myImage:md5sums. This would be a failsafe technique, unless the user would hexedit files in the image by hand (which the average user doesn't); as a protective measure, you could store in the :md5sums stream the MD5 of the image's header (of everything except the data) and only use it if valid.
In practical terms, you could drop somewhere a checkbox saying 'Use image layout file' (though, given my previous post, 'layout' would be a conflicting term), and if the user checked it:
image.Open {
...
if (!isLayoutFileValid ()) {
warnUser ();
generateLayoutFile ();
}
}
image.Save {
...
generateLayoutFile ();
}
Regards,
Mircea.
Posted by xoben on Jun. 01 2006,19:26
QUOTE
The problem is, if I add a file to an image in which it already exists (in a different folder, or by another name), 'Optimize' won't work. This is surely understandable, since 'Optimize' only 'looks' at the after-last-save added file.
Are you sure of that? UltraISO should optimize all files including both existed and newly added.
Posted by mionica on Jun. 02 2006,22:23
Yes, I am sure. Please see the attached case study.Reagards,
Mircea.
Posted by xoben on Jun. 04 2006,19:49
This is a normal case. UltraISO will disable 'Optimize' when you save directly. To avoid this limitation, please use 'Save As' or check 'Recompile ISO when saving directly'.
Posted by mionica on Jun. 05 2006,03:16
Lol. It desn't 
I mean, I tried simply saving (optimize checked) the same file twice to an already existing image and - guess what - optimization did work (same LBA for both added files, just as I hoped it to be).
Anyway, my point was that you could (not should) optimize the optimization procedure further, i.e. make it a great deal faster. And, because I don't believe in criticising without providing a solution, I suggested the ADS approach.