Split libsquashfs.a into low seperate libraries

The idea is to make libsquashfs.a independend of libfstree.a, so it becomes
a general purpose squashfs manipulation library. All the high level glue code
for libfstree.a and utilites that are overly specific with to tools are moved
to a seperate librarby.

This commit makes the first step by moving the stuff with dependencies on
libfstree to a seperate library.

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

1 files changed, 65 insertions, 0 deletions

diff --git a/lib/sqfshelper/serialize_fstree.c b/lib/sqfshelper/serialize_fstree.c
new file mode 100644
index 0000000..736744b
--- /dev/null
+++ b/lib/sqfshelper/serialize_fstree.c
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * serialize_fstree.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "meta_writer.h"
+#include "highlevel.h"
+#include "util.h"
+
+#include <unistd.h>
+#include <stdio.h>
+
+int sqfs_serialize_fstree(int outfd, sqfs_super_t *super, fstree_t *fs,
+			  compressor_t *cmp, id_table_t *idtbl)
+{
+	meta_writer_t *im, *dm;
+	uint32_t offset;
+	uint64_t block;
+	int ret = -1;
+	size_t i;
+
+	im = meta_writer_create(outfd, cmp, false);
+	if (im == NULL)
+		return -1;
+
+	dm = meta_writer_create(outfd, cmp, true);
+	if (dm == NULL)
+		goto out_im;
+
+	for (i = 2; i < fs->inode_tbl_size; ++i) {
+		if (meta_writer_write_inode(fs, idtbl, im, dm,
+					    fs->inode_table[i])) {
+			goto out;
+		}
+	}
+
+	if (meta_writer_flush(im))
+		goto out;
+
+	if (meta_writer_flush(dm))
+		goto out;
+
+	super->root_inode_ref = fs->root->inode_ref;
+
+	meta_writer_get_position(im, &block, &offset);
+	super->inode_table_start = super->bytes_used;
+	super->bytes_used += block;
+
+	meta_writer_get_position(dm, &block, &offset);
+	super->directory_table_start = super->bytes_used;
+	super->bytes_used += block;
+
+	if (meta_write_write_to_file(dm))
+		goto out;
+
+	ret = 0;
+out:
+	meta_writer_destroy(dm);
+out_im:
+	meta_writer_destroy(im);
+	return ret;
+}