openaddresses/openaddresses — pull request #68 by ingalls (2014-03-15 04:51:20+00:00)
Title: Add Compression Field

Some addresses do not have a compression field, making it necessary to interpret it from the downloaded filename. When using a tool such as openaddresses-download, the user may not know the file type and save the downloaded file without the proper extension, making guessing the compression more difficult.