add multiReadSeeker

vecio.go

@@ -0,0 +1,40 @@
+
+package ts
+
+import (
+	"io"
+)
+
+func getSeekerLength(data io.Seeker) (length int64) {
+	length, _ = data.Seek(0, 2)
+	data.Seek(0, 0)
+	return
+}
+
+type multiReadSeeker struct {
+	readers []io.ReadSeeker
+}
+
+func (mr *multiReadSeeker) Seek(offset int64, whence int) (n int64, err error) {
+	if whence == 2 {
+		for _, reader := range mr.readers {
+			n += getSeekerLength(reader)
+		}
+	}
+	return
+}
+
+func (mr *multiReadSeeker) Read(p []byte) (n int, err error) {
+	for len(mr.readers) > 0 {
+		n, err = mr.readers[0].Read(p)
+		if n > 0 || err != io.EOF {
+			if err == io.EOF {
+				err = nil
+			}
+			return
+		}
+		mr.readers = mr.readers[1:]
+	}
+	return 0, io.EOF
+}
+