Unzipping files compressed with unix "compress"

I'm writing a bit of code that interrogates database activity snapshot files and stores key data in a database. The snapshot files are produced every hour and are compressed using the unix "compress" command.
I want to read the contents (a single text file) of these compressed files and I thought that the java.io.Zip package would give me what I was looking for.
In the code below, I already have an array of file references. I'm just iterating over the files, creating a ZipFile object from the File reference. That's where I get my ZipException (ZipfileUtility.java:57).
            for(int i=0; i<snapshots.length; i++){
                System.out.println(snapshots);
ZipFile zipFile = new ZipFile(snapshots[i]);
System.out.println("About to read zipfile");
Enumeration enumeration = zipFile.entries();
while(enumeration.hasMoreElements()){
System.out.println("Getting zip entry");
ZipEntry entry = (ZipEntry) enumeration.nextElement();
System.out.println(entry);
zipFile.close();
And the exception stack trace...
java.util.zip.ZipException: error in opening zip file
     at java.util.zip.ZipFile.open(Native Method)
     at java.util.zip.ZipFile.<init>(Unknown Source)
     at java.util.zip.ZipFile.<init>(Unknown Source)
     at org.lawford.zip.ZipfileUtility.main(ZipfileUtility.java:57)I couldn't find reference to ZipFiles NOT being able to read compress-ed files. Mind you, I couldn't find reference to them being able to either.
Am I out of luck? Does ZipFile understand the compress format? Am I missing something that I should have seen in the API?
I currently have no control over how the snapshots are compressed at source. I understand that the preferred archiving and compression command on unix is gzip.
Any suggestions?
Thanks.

Hi,
ZIP and compress are incompatible. Compress is based on the LZW algorithm, which is also used to compress GIF images. Unisys has intellectual propteries on this algorithm, which was one of the reasons to develop a roality-free algorithm. One of them is the ZIP format. ZIP can also create archives of files, while compress only handles a single file.
So you're not lucky in using the java.io.zip package in reading a compressed file.
Might be you could start the uncompress command via Runtime.exec and read the uncompressed data from the OutputStream of this process.

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