diff --git a/pisi/archive.py b/pisi/archive.py
index 4642486b..75e7720f 100644
--- a/pisi/archive.py
+++ b/pisi/archive.py
@@ -57,14 +57,17 @@ class ArchiveZip(ArchiveBase):
     def __init__(self, filepath, type="zip"):
 	super(ArchiveZip, self).__init__(filepath, type)
 
-    def unpack_file_cond(self, pred, targetDir):
+    def unpack_file_cond(self, pred, targetDir, extractRoot=''):
         """ unpack file according to predicate function filename -> bool"""
 	super(ArchiveTarFile, self).unpack(targetDir)
 
         zip = zipfile.ZipFile(self.filePath, 'r')
         for file in zip.namelist():
-            if pred(file):              # search for path
-                opath = os.path.join(targetDir, file)
+            if pred(file):              # check if condition holds
+                if extractRoot=='':
+                    ofile = os.path.join(targetDir, file)
+                else:
+                    raise ArchiveError("changing extraction root not implemented yet")
                 if os.path.isdir(ofile):
                     continue
                 util.check_dir(os.path.dirname(ofile))
diff --git a/pisi/package.py b/pisi/package.py
index 0182b03d..b3886381 100644
--- a/pisi/package.py
+++ b/pisi/package.py
@@ -19,15 +19,18 @@ class Package:
 
     def extract_file(self, path, outdir):
         """extract file with path to outdir"""
+        impl.unpack_file(path, outdir)
 
     def extract_dir(self, dir, outdir):
         """extract directory recursively, this function
         copies the directory archiveroot/dir to outdir"""
+        impl.unpack_dir(path, outdir)
 
     def extract_dir_flat(self, dir, outdir):
         """extract directory recursively, this function
         unpacks the *contents* of directory archiveroot/dir inside outdir
         this is the function used by the installer"""
+        impl.unpack_dir_flat(dir, outdir)
         
     def extract_PISI_files(self, outdir):
         """extract PISI control files: metadata.xml, files.xml,