Fix BlobReadWriter.Reopen method.

blob.go

@@ -134,3 +134,11 @@ func (r *BlobReader) Reopen(rowid int64) error {
 	r.ReadOffset = 0
 	return nil
 }
+
+func (w *BlobReadWriter) Reopen(rowid int64) error {
+	if err := w.BlobReader.Reopen(rowid); err != nil {
+		return err
+	}
+	w.WriteOffset = 0
+	return nil
+}

blob_test.go

@@ -37,10 +37,15 @@ func TestBlob(t *testing.T) {
 	defer br.Close()
 	size, err := br.Size()
 	checkNoError(t, err, "blob size error: %s")
+
 	content = make([]byte, size)
-	n, err = br.Read(content)
+	n, err = br.Read(content[:5])
+	checkNoError(t, err, "blob read error: %s")
+	assertEquals(t, "expected %d bytes but got %d", 5, n)
+
+	n, err = br.Read(content[5:])
 	checkNoError(t, err, "blob read error: %s")
-	assertEquals(t, "expected %d bytes but got %d", 10, n)
+	assertEquals(t, "expected %d bytes but got %d", 5, n)
 	//fmt.Printf("%#v\n", content)
 	br.Close()
 }