deltas: Use endianness marker when parsing

Extend the `static-delta show` and `pull` commands to use the
endianness information (if available).

tests/pull-test.sh

@@ -113,8 +113,8 @@ ostree --repo=ostree-srv/gnomerepo summary -u
 cd ${test_tmpdir}
 repo_init
 ${CMD_PREFIX} ostree --repo=repo pull origin main@${prev_rev}
-${CMD_PREFIX} ostree --repo=repo pull --dry-run --require-static-deltas origin main >out.txt
-assert_file_has_content out.txt 'Delta update: 0/1 parts'
+${CMD_PREFIX} ostree --repo=repo pull --dry-run --require-static-deltas origin main >dry-run-pull.txt
+assert_file_has_content dry-run-pull.txt 'Delta update: 0/1 parts'
 rev=$(${CMD_PREFIX} ostree --repo=repo rev-parse origin:main)
 assert_streq "${prev_rev}" "${rev}"
 ${CMD_PREFIX} ostree --repo=repo fsck
@@ -142,6 +142,21 @@ assert_not_has_file baz/saucer
 
 echo "ok static delta"
 
+cd ${test_tmpdir}
+${CMD_PREFIX} ostree --repo=ostree-srv/gnomerepo static-delta generate --swap-endianness main
+${CMD_PREFIX} ostree --repo=ostree-srv/gnomerepo summary -u
+
+repo_init
+${CMD_PREFIX} ostree --repo=repo pull origin main@${prev_rev}
+${CMD_PREFIX} ostree --repo=repo pull --require-static-deltas --dry-run origin main >byteswapped-dry-run-pull.txt
+${CMD_PREFIX} ostree --repo=repo fsck
+
+if ! diff -u dry-run-pull.txt byteswapped-dry-run-pull.txt; then
+    assert_not_reached "byteswapped delta differs in size"
+fi
+
+echo "ok pull byteswapped delta"
+
 cd ${test_tmpdir}
 rm ostree-srv/gnomerepo/deltas -rf
 ostree --repo=ostree-srv/gnomerepo summary -u

tests/test-delta.sh

@@ -119,6 +119,15 @@ assert_file_has_content show.txt 'Endianness: \(little\|big\)'
 
 echo 'ok show'
 
+${CMD_PREFIX} ostree --repo=repo static-delta generate --swap-endianness --from=${origrev} --to=${newrev}
+${CMD_PREFIX} ostree --repo=repo static-delta show ${origrev}-${newrev} > show-swapped.txt
+totalsize_orig=$(grep 'Total Size:' show.txt)
+totalsize_swapped=$(grep 'Total Size:' show-swapped.txt)
+assert_not_streq "${totalsize_orig}" ""
+assert_streq "${totalsize_orig}" "${totalsize_swapped}"
+
+echo 'ok generate + show endian swapped'
+
 mkdir repo2 && ${CMD_PREFIX} ostree --repo=repo2 init --mode=archive-z2
 ${CMD_PREFIX} ostree --repo=repo2 pull-local repo ${newrev}
 ${CMD_PREFIX} ostree --repo=repo2 fsck