public static void unpack(InputStream is, File outputDir, Charset charset) {
    unpack(is, outputDir, IdentityNameMapper.INSTANCE, charset);
  }
public static void unpack ( InputStream is , File outputDir , Charset charset ) { unpack ( is , outputDir , IdentityNameMapper . INSTANCE , charset ) ; }
Unpacks a ZIP stream to the given directory.
<p>
The output directory must not be a file.

@param is
inputstream for ZIP file.
@param outputDir
output directory (created automatically if not found).
@param charset
charset used to process the zip stream