I come upon a requirement to unzip a file in a platform independent way.  Jim Marion got me most of the way, but his code didn’t write it to file.  Here’s my adjustment to make a function that wrote it to file:

Function unzip(&inputZipFile, &targetDir)
  Local JavaObject &zipFileInputStream = CreateJavaObject("java.io.FileInputStream", &inputZipFile);
  Local JavaObject &zipInputStream = CreateJavaObject("java.util.zip.ZipInputStream", &zipFileInputStream);
  Local JavaObject &zipEntry = &zipInputStream.getNextEntry();
  Local JavaObject &buf = CreateJavaArray("byte[]", 1024);
  Local number &byteCount;

  While &zipEntry <> Null

    If (&zipEntry.isDirectory()) Then
      REM ** do nothing;
    Else
      Local JavaObject &outFile = CreateJavaObject("java.io.File", &targetDir | &zipEntry.getName());
      &outFile.getParentFile().mkdirs();
      Local JavaObject &out = CreateJavaObject("java.io.FileOutputStream", &outFile);
      &byteCount = &zipInputStream.read(&buf);

      While &byteCount > 0
        &out.write(&buf, 0, &byteCount);
        &byteCount = &zipInputStream.read(&buf);
      End-While;

      &zipInputStream.closeEntry();
    End-If;

    &zipEntry = &zipInputStream.getNextEntry();
  End-While;

  &zipInputStream.close();
  &zipFileInputStream.close();
End-Function;

unzip("/tmp/myzipfile.zip", "/tmp/out");

Resources

• Manipulating Zip Files with PeopleCode