Get zip archive unziped size without extracting
It's techincally possibe to calc ZIP arch size without extracting it any idea how to do it with NSIS?
Get zip archive unziped size without extracting
3 posts
To do it in NSIS you would have to write a new NSIS plugin or call a external program...
You can use this library: http://www.csdinc.co.jp/archiver/lib/7-zip32.html
To save you the trouble of finding your way around a Japanese site, this is the dl link and this is the link to (pretty awful) English documentation.
The functions of interest in your case are SevenZipGetOriginalSize / SevenZipGetArcOriginalSize. They both return uncompressed size for an individual file; the first returns actual file size and the latter returns cumulative size. There's no function that would simply return the size of the whole archive, at least none that I could find.
An example, using SevenZipGetArcOriginalSize; it finds the last file in the archive and queries its cumulative size (which equals total size):
To save you the trouble of finding your way around a Japanese site, this is the dl link and this is the link to (pretty awful) English documentation.
The functions of interest in your case are SevenZipGetOriginalSize / SevenZipGetArcOriginalSize. They both return uncompressed size for an individual file; the first returns actual file size and the latter returns cumulative size. There's no function that would simply return the size of the whole archive, at least none that I could find.
An example, using SevenZipGetArcOriginalSize; it finds the last file in the archive and queries its cumulative size (which equals total size):
!define ArcName "test.zip"
InitPluginsDir
File /oname=$PLUGINSDIR\7-zip32.dll 7-zip32.dll
File /oname=$PLUGINSDIR\${ArcName} ${ArcName}
System::Call "$PLUGINSDIR\7-zip32::SevenZipGetFileCount(t '$PLUGINSDIR\${ArcName}') i.R0"
IntCmp $R0 0 0 +2 +3
MessageBox MB_OK|MB_ICONINFORMATION "Empty archive." IDOK ArcSizeEnd
MessageBox MB_OK|MB_ICONSTOP "Can't open archive" IDOK ArcSizeEnd
System::Call "$PLUGINSDIR\7-zip32::SevenZipOpenArchive(i 0, t '$PLUGINSDIR\${ArcName}', i 0) i.R1"
StrCmp $R1 0 0 +2
MessageBox MB_OK|MB_ICONSTOP "Can't open archive" IDOK ArcSizeEnd
System::Call "$PLUGINSDIR\7-zip32::SevenZipFindFirst(i R1, t '', i 0) i."
FileLoop:
IntOp $R0 $R0 - 1
StrCmp $R0 0 +3
System::Call "$PLUGINSDIR\7-zip32::SevenZipFindNext(i R1, i 0) i."
Goto FileLoop
System::Call "$PLUGINSDIR\7-zip32::SevenZipGetArcOriginalSize(i R1) i.R2"
System::Call "$PLUGINSDIR\7-zip32::SevenZipCloseArchive(i R1) i."
MessageBox MB_OK|MB_ICONINFORMATION "Uncompressed archive size: $R2 B"
ArcSizeEnd: