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-rw-r--r--bin/sqfsdiff/extract.c57
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;
+}