1 files changed, 57 insertions, 0 deletions
diff --git a/bin/sqfsdiff/extract.c b/bin/sqfsdiff/extract.c
new file mode 100644
index 0000000..979572a
--- /dev/null
+++ b/bin/sqfsdiff/extract.c
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * extract.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "sqfsdiff.h"
+
+static int extract(sqfs_data_reader_t *data, const sqfs_inode_generic_t *inode,
+		   const char *prefix, const char *path, size_t block_size)
+{
+	char *ptr, *temp;
+	FILE *fp;
+
+	temp = alloca(strlen(prefix) + strlen(path) + 2);
+	sprintf(temp, "%s/%s", prefix, path);
+
+	ptr = strrchr(temp, '/');
+	*ptr = '\0';
+	if (mkdir_p(temp))
+		return -1;
+	*ptr = '/';
+
+	fp = fopen(temp, "wb");
+	if (fp == NULL) {
+		perror(temp);
+		return -1;
+	}
+
+	if (sqfs_data_reader_dump(path, data, inode, fp, block_size, true)) {
+		fclose(fp);
+		return -1;
+	}
+
+	fflush(fp);
+	fclose(fp);
+	return 0;
+}
+
+int extract_files(sqfsdiff_t *sd, const sqfs_inode_generic_t *old,
+		  const sqfs_inode_generic_t *new,
+		  const char *path)
+{
+	if (old != NULL) {
+		if (extract(sd->sqfs_old.data, old, "old",
+			    path, sd->sqfs_old.super.block_size))
+			return -1;
+	}
+
+	if (new != NULL) {
+		if (extract(sd->sqfs_new.data, new, "new",
+			    path, sd->sqfs_new.super.block_size))
+			return -1;
+	}
+
+	return 0;
+}