def assert_headers_equal(expected, actual)
expected = expected.to_s unless String === expected
actual = actual.to_s unless String === actual
fields = %w[
name 100
mode 8
uid 8
gid 8
size 12
mtime 12
checksum 8
typeflag 1
linkname 100
magic 6
version 2
uname 32
gname 32
devmajor 8
devminor 8
prefix 155
]
offset = 0
until fields.empty? do
name = fields.shift
length = fields.shift.to_i
if name == "checksum" then
chksum_off = offset
offset += length
next
end
assert_equal expected[offset, length], actual[offset, length],
"Field #{name} of the tar header differs."
offset += length
end
assert_equal expected[chksum_off, 8], actual[chksum_off, 8]
end