mirror of
https://github.com/refraction-networking/uquic.git
synced 2025-04-05 21:27:35 +03:00
364 lines
11 KiB
Go
364 lines
11 KiB
Go
package frames
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import (
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"bytes"
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"github.com/lucas-clemente/quic-go/protocol"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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var _ = Describe("StreamFrame", func() {
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Context("when parsing", func() {
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It("accepts sample frame", func() {
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b := bytes.NewReader([]byte{0xa0, 0x1, 0x06, 0x00, 'f', 'o', 'o', 'b', 'a', 'r'})
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frame, err := ParseStreamFrame(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.FinBit).To(BeFalse())
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Expect(frame.StreamID).To(Equal(protocol.StreamID(1)))
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Expect(frame.Offset).To(BeZero())
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Expect(frame.DataLenPresent).To(BeTrue())
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Expect(frame.Data).To(Equal([]byte("foobar")))
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})
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It("accepts frame without data length", func() {
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b := bytes.NewReader([]byte{0x80, 0x1, 'f', 'o', 'o', 'b', 'a', 'r'})
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frame, err := ParseStreamFrame(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.FinBit).To(BeFalse())
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Expect(frame.StreamID).To(Equal(protocol.StreamID(1)))
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Expect(frame.Offset).To(BeZero())
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Expect(frame.DataLenPresent).To(BeFalse())
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Expect(frame.Data).To(Equal([]byte("foobar")))
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})
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})
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Context("when writing", func() {
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It("writes sample frame", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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DataLenPresent: true,
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}).Write(b, 0)
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Expect(b.Bytes()).To(Equal([]byte{0xa0, 0x1, 0x06, 0x00, 'f', 'o', 'o', 'b', 'a', 'r'}))
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})
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It("has proper min length for a short StreamID and a short offset", func() {
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b := &bytes.Buffer{}
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f := &StreamFrame{
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StreamID: 1,
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Data: []byte("f"),
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Offset: 0,
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}
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f.Write(b, 0)
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Expect(f.MinLength()).To(Equal(protocol.ByteCount(b.Len())))
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})
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It("has proper min length for a long StreamID and a big offset", func() {
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b := &bytes.Buffer{}
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f := &StreamFrame{
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StreamID: 0xDECAFBAD,
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Data: []byte("f"),
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Offset: 0xDEADBEEFCAFE,
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}
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f.Write(b, 0)
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Expect(f.MinLength()).To(Equal(protocol.ByteCount(b.Len())))
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})
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Context("data length field", func() {
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It("writes the data length", func() {
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dataLen := 0x1337
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b := &bytes.Buffer{}
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f := &StreamFrame{
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StreamID: 1,
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Data: bytes.Repeat([]byte{'f'}, dataLen),
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DataLenPresent: true,
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Offset: 0,
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}
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f.Write(b, 0)
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minLength, _ := f.MinLength()
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headerLength := minLength - 1
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Expect(b.Bytes()[0] & 0x20).To(Equal(uint8(0x20)))
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Expect(b.Bytes()[headerLength-2 : headerLength]).To(Equal([]byte{0x37, 0x13}))
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})
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It("omits the data length field", func() {
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dataLen := 0x1337
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b := &bytes.Buffer{}
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f := &StreamFrame{
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StreamID: 1,
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Data: bytes.Repeat([]byte{'f'}, dataLen),
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DataLenPresent: false,
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Offset: 0,
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}
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f.Write(b, 0)
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Expect(b.Bytes()[0] & 0x20).To(Equal(uint8(0)))
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Expect(b.Bytes()[1 : b.Len()-dataLen]).ToNot(ContainSubstring(string([]byte{0x37, 0x13})))
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minLength, _ := f.MinLength()
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f.DataLenPresent = true
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minLengthWithoutDataLen, _ := f.MinLength()
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Expect(minLength).To(Equal(minLengthWithoutDataLen - 2))
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})
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It("calculates the correcct min-length", func() {
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f := &StreamFrame{
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StreamID: 0xCAFE,
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Data: []byte("foobar"),
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DataLenPresent: false,
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Offset: 0xDEADBEEF,
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}
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minLengthWithoutDataLen, _ := f.MinLength()
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f.DataLenPresent = true
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Expect(f.MinLength()).To(Equal(minLengthWithoutDataLen + 2))
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})
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})
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Context("offset lengths", func() {
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It("does not write an offset if the offset is 0", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 0,
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x1c).To(Equal(uint8(0x0)))
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})
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It("writes a 2-byte offset if the offset is larger than 0", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 0x1337,
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x1c).To(Equal(uint8(0x1 << 2)))
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Expect(b.Bytes()[2:4]).To(Equal([]byte{0x37, 0x13}))
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})
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It("writes a 3-byte offset if the offset", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 0x13CAFE,
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x1c).To(Equal(uint8(0x2 << 2)))
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Expect(b.Bytes()[2:5]).To(Equal([]byte{0xFE, 0xCA, 0x13}))
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})
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It("writes a 4-byte offset if the offset", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 0xDEADBEEF,
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x1c).To(Equal(uint8(0x3 << 2)))
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Expect(b.Bytes()[2:6]).To(Equal([]byte{0xEF, 0xBE, 0xAD, 0xDE}))
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})
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It("writes a 5-byte offset if the offset", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 0x13DEADBEEF,
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x1c).To(Equal(uint8(0x4 << 2)))
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Expect(b.Bytes()[2:7]).To(Equal([]byte{0xEF, 0xBE, 0xAD, 0xDE, 0x13}))
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})
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It("writes a 6-byte offset if the offset", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 0xDEADBEEFCAFE,
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x1c).To(Equal(uint8(0x5 << 2)))
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Expect(b.Bytes()[2:8]).To(Equal([]byte{0xFE, 0xCA, 0xEF, 0xBE, 0xAD, 0xDE}))
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})
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It("writes a 7-byte offset if the offset", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 0x13DEADBEEFCAFE,
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x1c).To(Equal(uint8(0x6 << 2)))
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Expect(b.Bytes()[2:9]).To(Equal([]byte{0xFE, 0xCA, 0xEF, 0xBE, 0xAD, 0xDE, 0x13}))
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})
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It("writes a 8-byte offset if the offset", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 0x1337DEADBEEFCAFE,
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x1c).To(Equal(uint8(0x7 << 2)))
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Expect(b.Bytes()[2:10]).To(Equal([]byte{0xFE, 0xCA, 0xEF, 0xBE, 0xAD, 0xDE, 0x37, 0x13}))
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})
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})
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Context("lengths of StreamIDs", func() {
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It("returns an error for a non-valid StreamID length", func() {
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b := &bytes.Buffer{}
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err := (&StreamFrame{
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StreamID: 1,
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streamIDLen: 13,
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Data: []byte("foobar"),
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}).Write(b, 0)
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Expect(err).To(HaveOccurred())
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Expect(err).To(Equal(errInvalidStreamIDLen))
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})
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It("writes a 1 byte StreamID", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 13,
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Data: []byte("foobar"),
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x3).To(Equal(uint8(0x0)))
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Expect(b.Bytes()[1]).To(Equal(uint8(13)))
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})
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It("writes a 2 byte StreamID", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 0xCAFE,
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Data: []byte("foobar"),
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x3).To(Equal(uint8(0x1)))
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Expect(b.Bytes()[1:3]).To(Equal([]byte{0xFE, 0xCA}))
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})
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It("writes a 3 byte StreamID", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 0x13BEEF,
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Data: []byte("foobar"),
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x3).To(Equal(uint8(0x2)))
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Expect(b.Bytes()[1:4]).To(Equal([]byte{0xEF, 0xBE, 0x13}))
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})
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It("writes a 4 byte StreamID", func() {
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b := &bytes.Buffer{}
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(&StreamFrame{
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StreamID: 0xDECAFBAD,
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Data: []byte("foobar"),
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}).Write(b, 0)
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Expect(b.Bytes()[0] & 0x3).To(Equal(uint8(0x3)))
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Expect(b.Bytes()[1:5]).To(Equal([]byte{0xAD, 0xFB, 0xCA, 0xDE}))
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})
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})
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})
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Context("shortening of StreamIDs", func() {
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It("determines the length of a 1 byte StreamID", func() {
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f := &StreamFrame{StreamID: 0xFF}
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f.calculateStreamIDLength()
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Expect(f.streamIDLen).To(Equal(protocol.ByteCount(1)))
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})
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It("determines the length of a 2 byte StreamID", func() {
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f := &StreamFrame{StreamID: 0xFFFF}
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f.calculateStreamIDLength()
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Expect(f.streamIDLen).To(Equal(protocol.ByteCount(2)))
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})
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It("determines the length of a 1 byte StreamID", func() {
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f := &StreamFrame{StreamID: 0xFFFFFF}
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f.calculateStreamIDLength()
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Expect(f.streamIDLen).To(Equal(protocol.ByteCount(3)))
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})
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It("determines the length of a 1 byte StreamID", func() {
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f := &StreamFrame{StreamID: 0xFFFFFFFF}
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f.calculateStreamIDLength()
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Expect(f.streamIDLen).To(Equal(protocol.ByteCount(4)))
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})
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})
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Context("shortening of Offsets", func() {
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It("determines length 0 of offset 0", func() {
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f := &StreamFrame{Offset: 0}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(0)))
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})
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It("determines the length of a 2 byte offset", func() {
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f := &StreamFrame{Offset: 0xFFFF}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(2)))
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})
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It("determines the length of a 2 byte offset, even if it would fit into 1 byte", func() {
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f := &StreamFrame{Offset: 0x1}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(2)))
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})
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It("determines the length of a 3 byte offset", func() {
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f := &StreamFrame{Offset: 0xFFFFFF}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(3)))
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})
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It("determines the length of a 4 byte offset", func() {
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f := &StreamFrame{Offset: 0xFFFFFFFF}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(4)))
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})
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It("determines the length of a 5 byte offset", func() {
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f := &StreamFrame{Offset: 0xFFFFFFFFFF}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(5)))
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})
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It("determines the length of a 6 byte offset", func() {
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f := &StreamFrame{Offset: 0xFFFFFFFFFFFF}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(6)))
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})
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It("determines the length of a 7 byte offset", func() {
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f := &StreamFrame{Offset: 0xFFFFFFFFFFFFFF}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(7)))
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})
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It("determines the length of an 8 byte offset", func() {
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f := &StreamFrame{Offset: 0xFFFFFFFFFFFFFFFF}
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Expect(f.getOffsetLength()).To(Equal(protocol.ByteCount(8)))
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})
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})
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Context("splitting off earlier stream frames", func() {
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It("splits off nothing", func() {
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f := &StreamFrame{
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StreamID: 1,
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Data: []byte("bar"),
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Offset: 3,
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}
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Expect(f.MaybeSplitOffFrame(1000)).To(BeNil())
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Expect(f.Offset).To(Equal(protocol.ByteCount(3)))
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})
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It("splits off initial frame", func() {
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f := &StreamFrame{
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StreamID: 1,
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Data: []byte("foobar"),
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Offset: 3,
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FinBit: true,
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}
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minLength, _ := f.MinLength()
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previous := f.MaybeSplitOffFrame(minLength - 1 + 3)
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Expect(previous).ToNot(BeNil())
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Expect(previous.StreamID).To(Equal(protocol.StreamID(1)))
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Expect(previous.Data).To(Equal([]byte("foo")))
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Expect(previous.Offset).To(Equal(protocol.ByteCount(3)))
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Expect(previous.FinBit).To(BeFalse())
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Expect(f.StreamID).To(Equal(protocol.StreamID(1)))
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Expect(f.Data).To(Equal([]byte("bar")))
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Expect(f.Offset).To(Equal(protocol.ByteCount(6)))
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Expect(f.FinBit).To(BeTrue())
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})
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})
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})
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