$hash = ::Concat($prov.A RAR file is a compressed archive used to reduce the storage size of large files or groups of files. $entry.Open().Read($bytes, 0, $bytes.Length) $block = $().ResultĪdd-Type -AssemblyName System.IO.Compression # how to get the exact file-offset from the ZIP directory? # how to get the correct length of the central ZIP directory here? $length = $req.GetResponse().ContentLength # definition for the ZIP archive, the file to be extracted and the checksum: # and extracting the DLL into memory to mount it finally to the main process. Then extract the last file: $ unzip tail.zip KeePassX-2.0.2/zlib1.dllĮrror : missing 7751495 bytes in zipfileīased on the good input I have written a code-snippet in Powershell to show how it could work: # demo code downloading a single DLL file from an online ZIP archive Testing: KeePassX-2.0.2/share/translations/keepassx_zh_TW.qm OKĪt least one error was detected in tail.zip. Testing: KeePassX-2.0.2/share/translations/keepassx_zh_CN.qm OK Testing: KeePassX-2.0.2/share/translations/keepassx_uk.qm OK (please check that you have transferred or created the zipfile in theĪppropriate BINARY mode and that you have compiled UnZip properly)Įrror : attempt to seek before beginning of zipfile
% Total % Received % Xferd Average Speed Time Time Time Currentġ00 97k 100 97k 0 0 84739 0 0:00:01 0:00:01 -:-:- 84817Ĭheck what files we did get: $ unzip -t tail.zip
You can arrange for your file to appear in the back of the ZIP file.ĭownload 100k: $ curl -r -100000 -o tail.zip Of course you can also use whatever other tools beside the command-line one (I need sudo because it seems FUSE is set up that way on my machine, you shouldn't have to need it).
$ sudo unzip -p mount_pt/zipfile.zip the_file_I_want.txt > the_file_I_want.txt Mount a remote ZIP file and extract one file from it: $ mkdir mount_pt Here's an example for Linux using HTTPFS, a very lightweight virtual filesystem (it uses FUSE). This way the unzip utility's I/O calls are translated to HTTP range GETs, which means only the chunks of the ZIP file that you want get transferred over the network. This is easy if you mount the ZIP file via an HTTP-backed virtual filesystem and then use the standard unzip command on it. The trick is to do what Sergio suggests without doing it manually.
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