question: public static byte [ ] unwrapVCF ( File sourceFile , File tmpFile ) throws FileNotFoundException , IOException { ZipArchiveInputStream in = null ; FileOutputStream fos = null ; String hmacString = null ; try { in = new ZipArchiveInputStream ( new FileInputStream ( sourceFile ) ) ; ArchiveEntry entry ; in . getNextEntry ( ) ; fos = new FileOutputStream ( tmpFile ) ; IOUtils . copy ( in , fos ) ; entry = in . getNextEntry ( ) ; hmacString = entry . getName ( ) ; return Utils . hexToBytes ( hmacString ) ; } catch ( StringIndexOutOfBoundsException e ) { logger . error ( "Error parsing hmac: " + hmacString + " is no valid hex String" , e ) ; throw e ; } catch ( Exception e ) { logger . error ( "Error unwrapping VCF file" , e ) ; throw e ; } finally { if ( fos != null ) { fos . flush ( ) ; fos . close ( ) ; } if ( in != null ) { in . close ( ) ; } } }
target:  Method extracts the VCF file stored within the zipped import file to the given destination file. It further returns the corresponding hmac stored within the archive.