Move dir_entry_xattr_t from libio to libsquashfs

The structure and functions are renamed to sqfs_xattr_* instead,
an additional helper is added to accept an encoded xattr.
Documentation and unit test are added as well.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 111 insertions, 0 deletions

diff --git a/lib/sqfs/test/xattr.c b/lib/sqfs/test/xattr.c
new file mode 100644
index 0000000..a5222f4
--- /dev/null
+++ b/lib/sqfs/test/xattr.c
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * xattr.c
+ *
+ * Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "compat.h"
+#include "util/test.h"
+
+#include "sqfs/xattr.h"
+#include "sqfs/error.h"
+
+int main(int argc, char **argv)
+{
+	sqfs_xattr_t *ent, *ent2, *list;
+	const char *str;
+	int id, ret;
+	(void)argc; (void)argv;
+
+	/* prefix API */
+	id = sqfs_get_xattr_prefix_id("user.mime_type");
+	TEST_EQUAL_I(id, SQFS_XATTR_USER);
+
+	str = sqfs_get_xattr_prefix(id);
+	TEST_STR_EQUAL(str, "user.");
+
+	id = sqfs_get_xattr_prefix_id("security.selinux");
+	TEST_EQUAL_I(id, SQFS_XATTR_SECURITY);
+
+	str = sqfs_get_xattr_prefix(id);
+	TEST_STR_EQUAL(str, "security.");
+
+	id = sqfs_get_xattr_prefix_id("trusted.bla");
+	TEST_EQUAL_I(id, SQFS_XATTR_TRUSTED);
+
+	str = sqfs_get_xattr_prefix(id);
+	TEST_STR_EQUAL(str, "trusted.");
+
+	id = sqfs_get_xattr_prefix_id("system.acl");
+	TEST_EQUAL_I(id, SQFS_ERROR_UNSUPPORTED);
+
+	str = sqfs_get_xattr_prefix(id);
+	TEST_NULL(str);
+
+	/* combined entry API */
+	ent = sqfs_xattr_create("foo.bar", (const sqfs_u8 *)"Hello, World!", 5);
+	TEST_NOT_NULL(ent);
+	TEST_EQUAL_UI(ent->value_len, 5);
+	TEST_STR_EQUAL(ent->key, "foo.bar");
+	TEST_STR_EQUAL((const char *)ent->value, "Hello");
+	sqfs_xattr_list_free(ent);
+
+	/* with prefix */
+	ret = sqfs_xattr_create_prefixed(&ent, SQFS_XATTR_SECURITY, "selinux",
+					 (const sqfs_u8 *)"Hello, World!", 5);
+	TEST_EQUAL_I(ret, 0);
+	TEST_NOT_NULL(ent);
+	TEST_EQUAL_UI(ent->value_len, 5);
+	TEST_STR_EQUAL(ent->key, "security.selinux");
+	TEST_STR_EQUAL((const char *)ent->value, "Hello");
+	sqfs_xattr_list_free(ent);
+
+	ret = sqfs_xattr_create_prefixed(&ent, 42, "selinux",
+					 (const sqfs_u8 *)"Hello, World!", 5);
+	TEST_EQUAL_I(ret, SQFS_ERROR_UNSUPPORTED);
+	TEST_NULL(ent);
+
+	/* list copy */
+	ent = sqfs_xattr_create("foo.bar", (const sqfs_u8 *)"Hello, World!", 5);
+	TEST_NOT_NULL(ent);
+
+	ent2 = sqfs_xattr_create("bla.blu", (const sqfs_u8 *)"test", 4);
+	TEST_NOT_NULL(ent2);
+
+	list = sqfs_xattr_list_copy(NULL);
+	TEST_NULL(list);
+
+	list = sqfs_xattr_list_copy(ent);
+	TEST_NOT_NULL(list);
+	TEST_ASSERT(list != ent);
+	TEST_STR_EQUAL(list->key, ent->key);
+	TEST_STR_EQUAL((const char *)list->value, (const char *)ent->value);
+	TEST_EQUAL_UI(list->value_len, ent->value_len);
+	sqfs_xattr_list_free(list);
+
+	ent->next = ent2;
+	ent2->next = NULL;
+
+	list = sqfs_xattr_list_copy(ent);
+	TEST_NOT_NULL(list);
+	TEST_ASSERT(list != ent && list != ent2);
+	TEST_STR_EQUAL(list->key, ent->key);
+	TEST_STR_EQUAL((const char *)list->value, (const char *)ent->value);
+	TEST_EQUAL_UI(list->value_len, ent->value_len);
+
+	TEST_NOT_NULL(list->next);
+	TEST_ASSERT(list->next != ent && list->next != ent2);
+	TEST_STR_EQUAL(list->next->key, ent2->key);
+	TEST_STR_EQUAL((const char *)list->next->value,
+		       (const char *)ent2->value);
+	TEST_EQUAL_UI(list->next->value_len, ent2->value_len);
+	sqfs_xattr_list_free(list);
+
+	ent->next = NULL;
+	ent2->next = NULL;
+	sqfs_xattr_list_free(ent);
+	sqfs_xattr_list_free(ent2);
+
+	return EXIT_SUCCESS;
+}