Contact card decompress, split, merge

contactcard.go

@@ -43,17 +43,53 @@ func (contact *ContactCard) Compress() ([]byte, error) {
 		return nil, err
 	}
 	var b bytes.Buffer
-	gz := gzip.NewWriter(&b)
+	gz, err := gzip.NewWriterLevel(&b, gzip.BestCompression)
+	if err != nil {
+		return nil, err
+	}
 	if _, err := gz.Write(out); err != nil {
-		log.Fatal(err)
+		return nil, err
 	}
 	if err := gz.Close(); err != nil {
-		log.Fatal(err)
+		return nil, err
 	}
 	fmt.Println(b.Bytes())
 	return b.Bytes(), nil
 }
 
+func (contact *ContactCard) Split(parts uint8) (packets [][]byte, err error) {
+	data, err := contact.Compress()
+	if err != nil {
+		return nil, err
+	}
+	return BufferSplit(data, parts)
+}
+
+func NewContactCardFromCompressed(compressed []byte) (*ContactCard, error) {
+	cc := &ContactCard{}
+	reader := bytes.NewReader([]byte(compressed))
+	gzreader, err := gzip.NewReader(reader)
+	if err != nil {
+		return nil, err
+	}
+	output, err := ioutil.ReadAll(gzreader)
+	if err != nil {
+		return nil, err
+	}
+	if err := proto.Unmarshal(output, cc); err != nil {
+		return nil, err
+	}
+	return cc, nil
+}
+
+func NewContactCardFromSplit(packets [][]byte) (*ContactCard, error) {
+	data, err := BufferMerge(packets)
+	if err != nil {
+		return nil, err
+	}
+	return NewContactCardFromCompressed(data)
+}
+
 func (contact *ContactCard) WriteCompressed(filename string) error {
 	out, err := contact.Compress()
 	if err != nil {