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Message:

transfering zip files via URL and sockets

Posted by john on August 30, 2000 at 9:01 PM

I'm using sockets to transfer zip files (I use WinZip 8.0) to/from remote machine (remote and local are same in this case).

I use a zipInputStream to read in a ZipEntry object from a zip file, but when I write that same object to a zipOutputStream, I get a
java.util.zip.ZipException: invalid entry compressed size

For some reason, it's unable to write the correct compressed size to the zipOutputStream.
So, instead I create a new ZipEntry object with the same name and size, and put it on the zipOutputStream. But when the client reads from the socket's input stream, in our case, the zipInputStream, it cannot get the size of the zipEntry (zipEntry.getSize() = -1). Same thing happens when I read from a URL connection. This is a problem b/c if I read more or less class bytes, the target class will not be resolved by my custom class loader.
Why can't the zip entry size be determined when it's being read over a socket or URL connection - how can the size value be preserved ?

platform: windows NT 4.o
jdk1.2.2-006

thanks in advance,
john

• zip file transfer over socket connection john August 31, 2000 at 12:39 PM (1)
  • Similar Problem... Tim Ragsdale November 10, 2000 at 1:57 PM (0)