parse RST_STREAM frames

utils/utils.go

@@ -18,6 +18,37 @@ func ReadUintN(b io.ByteReader, length uint8) (uint64, error) {
 	return res, nil
 }
 
+// ReadUint64 reads a uint64
+func ReadUint64(b io.ByteReader) (uint64, error) {
+	var b1, b2, b3, b4, b5, b6, b7, b8 uint8
+	var err error
+	if b1, err = b.ReadByte(); err != nil {
+		return 0, err
+	}
+	if b2, err = b.ReadByte(); err != nil {
+		return 0, err
+	}
+	if b3, err = b.ReadByte(); err != nil {
+		return 0, err
+	}
+	if b4, err = b.ReadByte(); err != nil {
+		return 0, err
+	}
+	if b5, err = b.ReadByte(); err != nil {
+		return 0, err
+	}
+	if b6, err = b.ReadByte(); err != nil {
+		return 0, err
+	}
+	if b7, err = b.ReadByte(); err != nil {
+		return 0, err
+	}
+	if b8, err = b.ReadByte(); err != nil {
+		return 0, err
+	}
+	return uint64(b1) + uint64(b2)<<8 + uint64(b3)<<16 + uint64(b4)<<24 + uint64(b5)<<32 + uint64(b6)<<40 + uint64(b7)<<48 + uint64(b8)<<56, nil
+}
+
 // ReadUint32 reads a uint32
 func ReadUint32(b io.ByteReader) (uint32, error) {
 	var b1, b2, b3, b4 uint8

utils/utils_test.go

@@ -53,6 +53,21 @@ var _ = Describe("Utils", func() {
 		})
 	})
 
+	Context("ReadUint64", func() {
+		It("reads a little endian", func() {
+			b := []byte{0x12, 0x35, 0xAB, 0xFF, 0xEF, 0xBE, 0xAD, 0xDE}
+			val, err := ReadUint64(bytes.NewReader(b))
+			Expect(err).ToNot(HaveOccurred())
+			Expect(val).To(Equal(uint64(0xDEADBEEFFFAB3512)))
+		})
+
+		It("throws an error if less than 8 bytes are passed", func() {
+			b := []byte{0x13, 0x34, 0xEA, 0x00, 0x14, 0xAA}
+			_, err := ReadUint64(bytes.NewReader(b))
+			Expect(err).To(HaveOccurred())
+		})
+	})
+
 	Context("WriteUint16", func() {
 		It("outputs 2 bytes", func() {
 			b := &bytes.Buffer{}