X-Git-Url: https://git.decadent.org.uk/gitweb/?a=blobdiff_plain;f=daklib%2Fformats.py;fp=daklib%2Fformats.py;h=aaad2715aac119bd40766d1cef333f9cf2df36df;hb=e102ad02c396868d6f6c514f42a641e78f7fca9b;hp=e8ab1d77d205f85db14ee80ea2cd5173e7ce8b3f;hpb=ef55b8c79ae2d3e593aacb7a1f4a3c893bf62094;p=dak.git

diff --git a/daklib/formats.py b/daklib/formats.py
index e8ab1d77..aaad2715 100644
--- a/daklib/formats.py
+++ b/daklib/formats.py
@@ -30,3 +30,16 @@ def parse_format(txt):
         format = format[:2]
 
     return format
+
+def validate_changes_format(format, field):
+    """
+    Validate a tuple-representation of a .changes Format: field. Raises
+    UnknownFormatError if the field is invalid, otherwise return type is
+    undefined.
+    """
+
+    if (format < (1, 5) or format > (1, 8)):
+        raise UnknownFormatError, repr(format)
+
+    if field != 'files' and format < (1, 8):
+        raise UnknownFormatError, repr(format)