update

Author: ipipdotnet

city.go

@@ -74,6 +74,15 @@ func NewCity(name string) (*City, error) {
 	}, nil
 }
 
+func NewCityFromBytes(bs []byte) (*City, error) {
+	r, e := newReaderFromBytes(bs, &CityInfo{})
+	if e != nil {
+		return nil, e
+	}
+
+	return &City{reader: r}, nil
+}
+
 // Reload the database
 func (db *City) Reload(name string) error {
 

reader.go

@@ -67,6 +67,18 @@ func newReader(name string, obj interface{}) (*reader, error) {
 	if err != nil {
 		return nil, ErrReadFull
 	}
+
+	return initBytes(body, fileSize, obj)
+}
+
+func newReaderFromBytes(body []byte, obj interface{}) (*reader, error) {
+	if len(body) < 4 {
+		return nil, ErrFileSize
+	}
+	return initBytes(body, len(body), obj)
+}
+
+func initBytes(body []byte, fileSize int, obj interface{}) (*reader, error) {
 	var meta MetaData
 	metaLength := int(binary.BigEndian.Uint32(body[0:4]))
 	if fileSize < (4 + metaLength) {