Question

14

Can't unzip 6 GB file: bad zipfile offset

rated 0 times [ 14] [ 0] / answers: 1 / hits: 4127 / 3 Years ago, fri, may 7, 2021, 6:17:31

I need to unzip a file of about 6 GB. However, I can't do it neither right-clicking (it gives an error saying "empty archive") or in the terminal, showing the following for the latter:

$ ls

 fhs-3.0.pdf   IDrive   Tese.zip  'Transport Studies of Dual-Gated ABC and ABA Trilayer Graphene: Band Gap Opening and Band Structure Tuning in Very Large Perpendicular Electric Fields - Zou.pdf'



$ unzip Tese.zip

Archive:  Tese.zip

warning [Tese.zip]:  4294967296 extra bytes at beginning or within zipfile

  (attempting to process anyway)

file #1:  bad zipfile offset (local header sig):  4294967296

  (attempting to re-compensate)

 extracting: Tese/.DS_Store          

error: not enough memory for bomb detection



$ jar xvf Tese.zip

java.util.zip.ZipException: only DEFLATED entries can have EXT descriptor

    at java.base/java.util.zip.ZipInputStream.readLOC(ZipInputStream.java:313)

    at java.base/java.util.zip.ZipInputStream.getNextEntry(ZipInputStream.java:125)

    at jdk.jartool/sun.tools.jar.Main.extract(Main.java:1361)

    at jdk.jartool/sun.tools.jar.Main.run(Main.java:409)

    at jdk.jartool/sun.tools.jar.Main.main(Main.java:1681)

I don't think the file is corrupt because I unzipped the same file in a Mac recently.

My PC has 15 GB of RAM and 2 GB of swap memory.

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soahan

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answered 3 Years ago breadoules · Accepted Answer

Both tools, unzip and jar, explicitly told you that the file is corrupt:

miguel@...$ unzip Tese.zip

...

warning [Tese.zip]:  4294967296 extra bytes at beginning or within zipfile

  (attempting to process anyway)

file #1:  bad zipfile offset (local header sig):  4294967296

  (attempting to re-compensate)

miguel@...$ jar xvf Tese.zip

java.util.zip.ZipException: only DEFLATED entries can have EXT 

...

If you could unzip it on a Mac, it might be possible that some Mac software created that ZIP file, but maybe in a nonstandard format (as far as ZIP file standardization goes) that only some Mac software can understand.

You could try to go to that Mac again, unzip it there and then create a compressed tar file from it, then take that tar file to your PC and unpack it.