X-Git-Url: http://git.grml.org/?p=grml2usb.git;a=blobdiff_plain;f=grml2usb;h=2bb543905d31cfebb10fbf46e8543f81787acb26;hp=b9df22f42f728adbe64cd05ec2a289c49a59dd2b;hb=68df4a8c900486fc17138b4da1fe1f0847c45396;hpb=abe68338ee0a37eeaccb8dd45c4d9c0b1a18d4ca

diff --git a/grml2usb b/grml2usb
index b9df22f..2bb5439 100755
--- a/grml2usb
+++ b/grml2usb
@@ -88,6 +88,21 @@ class CriticalException(Exception):
     pass
 
 
+# The following two functions help to operate on strings as
+# array (list) of bytes (octets). In Python 3000, the bytes
+# datatype will need to be used. This is intended for using
+# with manipulation of files on the octet level, like shell
+# arrays, e.g. in MBR creation.
+
+def array2string(a):
+    """Convert a list of integers [0;255] to a string."""
+    return struct.pack("%sB" % len(a), *a)
+
+def string2array(s):
+    """Convert a (bytes) string into a list of integers."""
+    return struct.unpack("%sB" % len(s), s)
+
+
 def cleanup():
     """Cleanup function to make sure there aren't any mounted devices left behind.
     """