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package qpack
import (
"bytes"
"golang.org/x/net/http2/hpack"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Encoder", func() {
var (
encoder *Encoder
output *bytes.Buffer
)
BeforeEach(func() {
output = &bytes.Buffer{}
encoder = NewEncoder(output)
})
readPrefix := func(data []byte) (rest []byte, requiredInsertCount uint64, deltaBase uint64) {
var err error
requiredInsertCount, rest, err = readVarInt(8, data)
Expect(err).ToNot(HaveOccurred())
deltaBase, rest, err = readVarInt(7, rest)
Expect(err).ToNot(HaveOccurred())
return
}
checkHeaderField := func(data []byte, hf HeaderField) []byte {
Expect(data[0] & (0x80 ^ 0x40 ^ 0x20)).To(Equal(uint8(0x20))) // 001xxxxx
Expect(data[0] & 0x8).ToNot(BeZero()) // Huffman encoding
nameLen, data, err := readVarInt(3, data)
Expect(err).ToNot(HaveOccurred())
l := hpack.HuffmanEncodeLength(hf.Name)
Expect(nameLen).To(BeEquivalentTo(l))
Expect(hpack.HuffmanDecodeToString(data[:l])).To(Equal(hf.Name))
valueLen, data, err := readVarInt(7, data[l:])
Expect(err).ToNot(HaveOccurred())
l = hpack.HuffmanEncodeLength(hf.Value)
Expect(valueLen).To(BeEquivalentTo(l))
Expect(hpack.HuffmanDecodeToString(data[:l])).To(Equal(hf.Value))
return data[l:]
}
// Reads one indexed field line representation from data and verifies it matches hf.
// Returns the leftover bytes from data.
checkIndexedHeaderField := func(data []byte, hf HeaderField) []byte {
Expect(data[0] >> 7).To(Equal(uint8(1))) // 1Txxxxxx
index, data, err := readVarInt(6, data)
Expect(err).ToNot(HaveOccurred())
Expect(staticTableEntries[index]).To(Equal(hf))
return data
}
checkHeaderFieldWithNameRef := func(data []byte, hf HeaderField) []byte {
// read name reference
Expect(data[0] >> 6).To(Equal(uint8(1))) // 01NTxxxx
index, data, err := readVarInt(4, data)
Expect(err).ToNot(HaveOccurred())
Expect(staticTableEntries[index].Name).To(Equal(hf.Name))
// read literal value
valueLen, data, err := readVarInt(7, data)
Expect(err).ToNot(HaveOccurred())
l := hpack.HuffmanEncodeLength(hf.Value)
Expect(valueLen).To(BeEquivalentTo(l))
Expect(hpack.HuffmanDecodeToString(data[:l])).To(Equal(hf.Value))
return data[l:]
}
It("encodes a single field", func() {
hf := HeaderField{Name: "foobar", Value: "lorem ipsum"}
Expect(encoder.WriteField(hf)).To(Succeed())
data, requiredInsertCount, deltaBase := readPrefix(output.Bytes())
Expect(requiredInsertCount).To(BeZero())
Expect(deltaBase).To(BeZero())
data = checkHeaderField(data, hf)
Expect(data).To(BeEmpty())
})
It("encodes multiple fields", func() {
hf1 := HeaderField{Name: "foobar", Value: "lorem ipsum"}
hf2 := HeaderField{Name: "raboof", Value: "dolor sit amet"}
Expect(encoder.WriteField(hf1)).To(Succeed())
Expect(encoder.WriteField(hf2)).To(Succeed())
data, requiredInsertCount, deltaBase := readPrefix(output.Bytes())
Expect(requiredInsertCount).To(BeZero())
Expect(deltaBase).To(BeZero())
data = checkHeaderField(data, hf1)
data = checkHeaderField(data, hf2)
Expect(data).To(BeEmpty())
})
It("encodes all the fields of the static table", func() {
for _, hf := range staticTableEntries {
Expect(encoder.WriteField(hf)).To(Succeed())
}
data, requiredInsertCount, deltaBase := readPrefix(output.Bytes())
Expect(requiredInsertCount).To(BeZero())
Expect(deltaBase).To(BeZero())
for _, hf := range staticTableEntries {
data = checkIndexedHeaderField(data, hf)
}
Expect(data).To(BeEmpty())
})
It("encodes fields with name reference in the static table", func() {
hf1 := HeaderField{Name: ":status", Value: "666"}
hf2 := HeaderField{Name: "server", Value: "lorem ipsum"}
hf3 := HeaderField{Name: ":method", Value: ""}
Expect(encoder.WriteField(hf1)).To(Succeed())
Expect(encoder.WriteField(hf2)).To(Succeed())
Expect(encoder.WriteField(hf3)).To(Succeed())
data, requiredInsertCount, deltaBase := readPrefix(output.Bytes())
Expect(requiredInsertCount).To(BeZero())
Expect(deltaBase).To(BeZero())
data = checkHeaderFieldWithNameRef(data, hf1)
data = checkHeaderFieldWithNameRef(data, hf2)
data = checkHeaderFieldWithNameRef(data, hf3)
Expect(data).To(BeEmpty())
})
It("encodes multiple requests", func() {
hf1 := HeaderField{Name: "foobar", Value: "lorem ipsum"}
Expect(encoder.WriteField(hf1)).To(Succeed())
data, requiredInsertCount, deltaBase := readPrefix(output.Bytes())
Expect(requiredInsertCount).To(BeZero())
Expect(deltaBase).To(BeZero())
data = checkHeaderField(data, hf1)
Expect(data).To(BeEmpty())
output.Reset()
Expect(encoder.Close())
hf2 := HeaderField{Name: "raboof", Value: "dolor sit amet"}
Expect(encoder.WriteField(hf2)).To(Succeed())
data, requiredInsertCount, deltaBase = readPrefix(output.Bytes())
Expect(requiredInsertCount).To(BeZero())
Expect(deltaBase).To(BeZero())
data = checkHeaderField(data, hf2)
Expect(data).To(BeEmpty())
})
})
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