From 85ea7bd736c58bf62c9779edc3fe055f5e38fe5a Mon Sep 17 00:00:00 2001
From: Mike McLean <mikem@redhat.com>
Date: Mar 14 2023 10:08:16 +0000
Subject: unit test


---

diff --git a/tests/test_lib/test_header_sizes.py b/tests/test_lib/test_header_sizes.py
new file mode 100644
index 0000000..9e0640e
--- /dev/null
+++ b/tests/test_lib/test_header_sizes.py
@@ -0,0 +1,67 @@
+# coding=utf-8
+from __future__ import absolute_import
+import os.path
+import unittest
+
+import koji
+import rpm
+
+
+SIGTAG_SIZE = 1000
+try:
+    SIGTAG_LONGSIZE = rpm.RPMTAG_LONGSIGSIZE
+except NameError:
+    SIGTAG_LONGSIZE = None
+
+
+class TestHeaderSizes(unittest.TestCase):
+
+    RPMFILES = [
+        "test-deps-1-1.fc24.x86_64.rpm",
+        "test-files-1-1.fc27.noarch.rpm",
+        "test-nosrc-1-1.fc24.nosrc.rpm",
+        "test-deps-1-1.fc24.x86_64.rpm.signed",
+        "test-nopatch-1-1.fc24.nosrc.rpm",
+        "test-src-1-1.fc24.src.rpm",
+    ]
+
+    def test_header_sizes(self):
+        for basename in self.RPMFILES:
+            fn = os.path.join(os.path.dirname(__file__), 'data/rpms', basename)
+
+            # the file length we want to match
+            st = os.stat(fn)
+            file_length = st.st_size
+
+            # An rpm consists of: lead, signature, header, archive
+            s_lead, s_sig = koji.find_rpm_sighdr(fn)
+            ofs = s_lead + s_sig
+            s_hdr = koji.rpm_hdr_size(fn, ofs)
+
+            # The signature can tell use the size of header+payload
+            # try LONGSIZE first, fall back to 32bit SIZE
+            sighdr = koji.rip_rpm_sighdr(fn)
+            rh = koji.RawHeader(sighdr)
+            size = None
+            try:
+                tag = rpm.RPMTAG_LONGSIGSIZE
+                size = rh.get(tag)
+            except NameError:
+                pass
+            if size is None:
+                size = rh.get(SIGTAG_SIZE)
+
+            # Expected file size
+            calc_size = s_lead + s_sig + size
+            self.assertEqual(calc_size, file_length)
+
+            # The following bit uses rpmlib to read the header, which advances the file
+            # pointer past it. This is the same approach rpm2cpio uses.
+            fd = os.open(fn, os.O_RDONLY)
+            os.lseek(fd, s_lead + s_sig, 0)  # seek to header start
+            hdr, h_start = rpm.readHeaderFromFD(fd)
+            p_offset = os.lseek(fd, 0, os.SEEK_CUR)
+            expect_payload = s_lead + s_sig + s_hdr
+            if not hdr:
+                raise Exception("rpm did not return a header")
+            self.assertEqual(p_offset, expect_payload)