use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/lucas-clemente/quic-go/internal/utils/byteorder.go

@@ -0,0 +1,25 @@
+package utils
+
+import (
+	"bytes"
+	"io"
+)
+
+// A ByteOrder specifies how to convert byte sequences into 16-, 32-, or 64-bit unsigned integers.
+type ByteOrder interface {
+	ReadUintN(b io.ByteReader, length uint8) (uint64, error)
+	ReadUint64(io.ByteReader) (uint64, error)
+	ReadUint32(io.ByteReader) (uint32, error)
+	ReadUint16(io.ByteReader) (uint16, error)
+
+	WriteUint64(*bytes.Buffer, uint64)
+	WriteUint56(*bytes.Buffer, uint64)
+	WriteUint48(*bytes.Buffer, uint64)
+	WriteUint40(*bytes.Buffer, uint64)
+	WriteUint32(*bytes.Buffer, uint32)
+	WriteUint24(*bytes.Buffer, uint32)
+	WriteUint16(*bytes.Buffer, uint16)
+
+	ReadUfloat16(io.ByteReader) (uint64, error)
+	WriteUfloat16(*bytes.Buffer, uint64)
+}