1 files changed, 88 insertions, 0 deletions
diff --git a/repo/export_dir.go b/repo/export_dir.go
new file mode 100644
index 0000000..8c63fdb
--- /dev/null
+++ b/repo/export_dir.go
@@ -0,0 +1,88 @@
+/* Copyright (C) 2021 Nicolas Peugnet <n.peugnet@free.fr>
+
+   This file is part of dna-backup.
+
+   dna-backup is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   dna-backup is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with dna-backup.  If not, see <https://www.gnu.org/licenses/>. */
+
+package repo
+
+import (
+	"bytes"
+	"compress/zlib"
+	"encoding/binary"
+	"io"
+
+	"github.com/n-peugnet/dna-backup/dna"
+	"github.com/n-peugnet/dna-backup/logger"
+	"github.com/n-peugnet/dna-backup/utils"
+)
+
+type Version struct {
+	Chunks uint64
+	Recipe uint64
+	Files  uint64
+}
+
+func (r *Repo) ExportDir(dest string, trackSize int) {
+	r.Init()
+	versions := make([]Version, len(r.versions))
+	chunks := r.loadChunks(r.versions)
+	for i := range versions {
+		var count int64
+		var content bytes.Buffer // replace with a reader capable of switching files
+		var recipe, fileList []byte
+		var err error
+		tracker := dna.NewWriter(&content, trackSize)
+		counter := utils.NewWriteCounter(tracker)
+		compressor := zlib.NewWriter(counter)
+		for _, c := range chunks[i] {
+			n, err := io.Copy(compressor, c.Reader())
+			if err != nil {
+				logger.Error(err)
+			}
+			count += n
+		}
+		compressor.Close()
+		tracker.Close()
+		readDelta(r.versions[i], recipeName, utils.NopReadWrapper, func(rc io.ReadCloser) {
+			recipe, err = io.ReadAll(rc)
+			if err != nil {
+				logger.Error("load recipe ", err)
+			}
+		})
+		readDelta(r.versions[i], filesName, utils.NopReadWrapper, func(rc io.ReadCloser) {
+			fileList, err = io.ReadAll(rc)
+			if err != nil {
+				logger.Error("load files ", err)
+			}
+		})
+		versions[i] = Version{
+			uint64(counter.Count()),
+			uint64(len(recipe)),
+			uint64(len(fileList)),
+		}
+		header := versions[i].createHeader()
+		logger.Info(header)
+	}
+}
+
+func (v Version) createHeader() []byte {
+	buf := make([]byte, binary.MaxVarintLen64*3)
+	i := 0
+	for _, x := range []uint64{v.Chunks, v.Recipe, v.Files} {
+		n := binary.PutUvarint(buf[i:], x)
+		i += n
+	}
+	return buf[:i]
+}