store recipe compressed

for now using zlib on a 556Mo dir:
recipe: 11668558 o -> 5540831 o
size divided by 2

4 files changed, 27 insertions, 14 deletions

diff --git a/TODO.md b/TODO.md
index acab4c2..9332c3a 100644
--- a/TODO.md
+++ b/TODO.md
@@ -45,7 +45,7 @@ reunion 7/09
 ------------
 - [ ] save recipe consecutive chunks as extents
 - [ ] store recipe and files incrementally
-- [ ] compress recipe
+- [x] compress recipe
 - [x] compress file list
 - [ ] make size comparison between recipe and chunks with some datasets
 
diff --git a/repo.go b/repo.go
index 36adb81..1e0f141 100644
--- a/repo.go
+++ b/repo.go
@@ -652,17 +652,22 @@ func (r *Repo) restoreStream(stream io.WriteCloser, recipe []Chunk) {
 
 func storeRecipe(dest string, recipe []Chunk) {
 	file, err := os.Create(dest)
-	if err == nil {
-		encoder := gob.NewEncoder(file)
-		for _, c := range recipe {
-			if err = encoder.Encode(&c); err != nil {
-				logger.Panic(err)
-			}
+	if err != nil {
+		logger.Panic(err)
+	}
+	out := utils.ZlibWriter(file)
+	encoder := gob.NewEncoder(out)
+	for _, c := range recipe {
+		if err = encoder.Encode(&c); err != nil {
+			logger.Panic(err)
 		}
 	}
 	if err != nil {
 		logger.Panic(err)
 	}
+	if err = out.Close(); err != nil {
+		logger.Panic(err)
+	}
 	if err = file.Close(); err != nil {
 		logger.Panic(err)
 	}
@@ -671,18 +676,26 @@ func storeRecipe(dest string, recipe []Chunk) {
 func loadRecipe(path string) []Chunk {
 	var recipe []Chunk
 	file, err := os.Open(path)
-	if err == nil {
-		decoder := gob.NewDecoder(file)
-		for i := 0; err == nil; i++ {
-			var c Chunk
-			if err = decoder.Decode(&c); err == nil {
-				recipe = append(recipe, c)
-			}
+	if err != nil && err != io.EOF {
+		logger.Panic(err)
+	}
+	in, err := utils.ZlibReader(file)
+	if err != nil {
+		logger.Panic(err)
+	}
+	decoder := gob.NewDecoder(in)
+	for i := 0; err == nil; i++ {
+		var c Chunk
+		if err = decoder.Decode(&c); err == nil {
+			recipe = append(recipe, c)
 		}
 	}
 	if err != nil && err != io.EOF {
 		logger.Panic(err)
 	}
+	if err = in.Close(); err != nil {
+		logger.Panic(err)
+	}
 	if err = file.Close(); err != nil {
 		logger.Panic(err)
 	}
diff --git a/testdata/repo_8k/00000/recipe b/testdata/repo_8k/00000/recipe
index 9a3962c..7532ee9 100644
--- a/testdata/repo_8k/00000/recipe
+++ b/testdata/repo_8k/00000/recipe
diff --git a/testdata/repo_8k_zlib/00000/recipe b/testdata/repo_8k_zlib/00000/recipe
index 9a3962c..7532ee9 100644
--- a/testdata/repo_8k_zlib/00000/recipe
+++ b/testdata/repo_8k_zlib/00000/recipe