1 files changed, 94 insertions, 0 deletions
diff --git a/bin/sqfsdiff/compare_dir.c b/bin/sqfsdiff/compare_dir.c
new file mode 100644
index 0000000..1a4c800
--- /dev/null
+++ b/bin/sqfsdiff/compare_dir.c
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * compare_dir.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "sqfsdiff.h"
+
+static int print_omitted(sqfsdiff_t *sd, bool is_old, sqfs_tree_node_t *n)
+{
+	char *path = node_path(n);
+
+	if (path == NULL)
+		return -1;
+
+	fprintf(stdout, "%c %s\n", is_old ? '<' : '>', path);
+
+	if ((sd->compare_flags & COMPARE_EXTRACT_FILES) &&
+	    S_ISREG(n->inode->base.mode)) {
+		if (extract_files(sd, is_old ? n->inode : NULL,
+				  is_old ? NULL : n->inode, path)) {
+			free(path);
+			return -1;
+		}
+	}
+
+	free(path);
+
+	for (n = n->children; n != NULL; n = n->next) {
+		if (print_omitted(sd, is_old, n))
+			return -1;
+	}
+
+	return 0;
+}
+
+int compare_dir_entries(sqfsdiff_t *sd, sqfs_tree_node_t *old,
+			sqfs_tree_node_t *new)
+{
+	sqfs_tree_node_t *old_it = old->children, *old_prev = NULL;
+	sqfs_tree_node_t *new_it = new->children, *new_prev = NULL;
+	int ret, result = 0;
+
+	while (old_it != NULL || new_it != NULL) {
+		if (old_it != NULL && new_it != NULL) {
+			ret = strcmp((const char *)old_it->name,
+				     (const char *)new_it->name);
+		} else if (old_it == NULL) {
+			ret = 1;
+		} else {
+			ret = -1;
+		}
+
+		if (ret < 0) {
+			result = 1;
+
+			if (print_omitted(sd, true, old_it))
+				return -1;
+
+			if (old_prev == NULL) {
+				old->children = old_it->next;
+				sqfs_dir_tree_destroy(old_it);
+				old_it = old->children;
+			} else {
+				old_prev->next = old_it->next;
+				sqfs_dir_tree_destroy(old_it);
+				old_it = old_prev->next;
+			}
+		} else if (ret > 0) {
+			result = 1;
+
+			if (print_omitted(sd, false, new_it))
+				return -1;
+
+			if (new_prev == NULL) {
+				new->children = new_it->next;
+				sqfs_dir_tree_destroy(new_it);
+				new_it = new->children;
+			} else {
+				new_prev->next = new_it->next;
+				sqfs_dir_tree_destroy(new_it);
+				new_it = new_prev->next;
+			}
+		} else {
+			old_prev = old_it;
+			old_it = old_it->next;
+
+			new_prev = new_it;
+			new_it = new_it->next;
+		}
+	}
+
+	return result;
+}