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package qpack
import (
"bytes"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"golang.org/x/net/http2/hpack"
)
var _ = Describe("Decoder", func() {
var (
decoder *Decoder
headerFields []HeaderField
)
BeforeEach(func() {
headerFields = nil
decoder = NewDecoder(func(hf HeaderField) {
headerFields = append(headerFields, hf)
})
})
insertPrefix := func(data []byte) []byte {
prefix := appendVarInt(nil, 8, 0)
prefix = appendVarInt(prefix, 7, 0)
return append(prefix, data...)
}
doPartialWrites := func(data []byte) {
for i := 0; i < len(data)-1; i++ {
n, err := decoder.Write([]byte{data[i]})
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(1))
Expect(headerFields).To(BeEmpty())
}
n, err := decoder.Write([]byte{data[len(data)-1]})
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(1))
Expect(headerFields).To(HaveLen(1))
}
It("rejects a non-zero Required Insert Count", func() {
prefix := appendVarInt(nil, 8, 1)
prefix = appendVarInt(prefix, 7, 0)
_, err := decoder.Write(prefix)
Expect(err).To(MatchError("decoding error: expected Required Insert Count to be zero"))
})
It("rejects a non-zero Delta Base", func() {
prefix := appendVarInt(nil, 8, 0)
prefix = appendVarInt(prefix, 7, 1)
_, err := decoder.Write(prefix)
Expect(err).To(MatchError("decoding error: expected Base to be zero"))
})
It("rejects unknown type bytes", func() {
_, err := decoder.Write(insertPrefix([]byte{0x10}))
Expect(err).To(MatchError("unexpected type byte: 0x10"))
})
Context("indexed header field", func() {
It("parses an indexed header field", func() {
data := appendVarInt(nil, 6, 20)
data[0] ^= 0x80 | 0x40
_, err := decoder.Write(insertPrefix(data))
Expect(err).ToNot(HaveOccurred())
Expect(headerFields).To(HaveLen(1))
Expect(headerFields[0]).To(Equal(staticTableEntries[20]))
})
It("rejects an indexed header field that references the dynamic table", func() {
data := appendVarInt(nil, 6, 20)
data[0] ^= 0x80 // don't set the static flag (0x40)
_, err := decoder.Write(insertPrefix(data))
Expect(err).To(MatchError(errNoDynamicTable))
})
It("errors when a non-existent static table entry is referenced", func() {
data := appendVarInt(nil, 6, 10000)
data[0] ^= 0x80 | 0x40
_, err := decoder.Write(insertPrefix(data))
Expect(err).To(MatchError("decoding error: invalid indexed representation index 10000"))
Expect(headerFields).To(BeEmpty())
})
It("handles partial writes", func() {
data := appendVarInt(nil, 6, 20)
data[0] ^= 0x80 | 0x40
data = insertPrefix(data)
doPartialWrites(data)
})
})
Context("header field with name reference", func() {
It("parses a literal header field with name reference", func() {
data := appendVarInt(nil, 4, 49)
data[0] ^= 0x40 | 0x10
data = appendVarInt(data, 7, 6)
data = append(data, []byte("foobar")...)
_, err := decoder.Write(insertPrefix(data))
Expect(err).ToNot(HaveOccurred())
Expect(headerFields).To(HaveLen(1))
Expect(headerFields[0].Name).To(Equal("content-type"))
Expect(headerFields[0].Value).To(Equal("foobar"))
})
It("parses a literal header field with name reference, with Huffman encoding", func() {
data := appendVarInt(nil, 4, 49)
data[0] ^= 0x40 | 0x10
data2 := appendVarInt(nil, 7, hpack.HuffmanEncodeLength("foobar"))
data2[0] ^= 0x80
data = hpack.AppendHuffmanString(append(data, data2...), "foobar")
_, err := decoder.Write(insertPrefix(data))
Expect(err).ToNot(HaveOccurred())
Expect(headerFields).To(HaveLen(1))
Expect(headerFields[0].Name).To(Equal("content-type"))
Expect(headerFields[0].Value).To(Equal("foobar"))
})
It("rejects a literal header field with name reference that references the dynamic table", func() {
data := appendVarInt(nil, 4, 49)
data[0] ^= 0x40 // don't set the static flag (0x10)
data = appendVarInt(data, 7, 6)
data = append(data, []byte("foobar")...)
_, err := decoder.Write(insertPrefix(data))
Expect(err).To(MatchError(errNoDynamicTable))
})
It("handles partial writes", func() {
data := appendVarInt(nil, 4, 49)
data[0] ^= 0x40 | 0x10
data = appendVarInt(data, 7, 6)
data = append(data, []byte("foobar")...)
data = insertPrefix(data)
doPartialWrites(data)
})
It("handles partial writes, when using Huffman encoding", func() {
data := appendVarInt(nil, 4, 49)
data[0] ^= 0x40 | 0x10
data2 := appendVarInt(nil, 7, hpack.HuffmanEncodeLength("foobar"))
data2[0] ^= 0x80
data = hpack.AppendHuffmanString(append(data, data2...), "foobar")
data = insertPrefix(data)
doPartialWrites(data)
})
})
Context("header field without name reference", func() {
It("parses a literal header field without name reference", func() {
data := appendVarInt(nil, 3, 3)
data[0] ^= 0x20
data = append(data, []byte("foo")...)
data2 := appendVarInt(nil, 7, 3)
data2 = append(data2, []byte("bar")...)
data = append(data, data2...)
_, err := decoder.Write(insertPrefix(data))
Expect(err).ToNot(HaveOccurred())
Expect(headerFields).To(HaveLen(1))
Expect(headerFields[0].Name).To(Equal("foo"))
Expect(headerFields[0].Value).To(Equal("bar"))
})
It("handles partial writes", func() {
data := appendVarInt(nil, 3, 3)
data[0] ^= 0x20
data = append(data, []byte("foo")...)
data2 := appendVarInt(nil, 7, 3)
data2 = append(data2, []byte("bar")...)
data = append(data, data2...)
data = insertPrefix(data)
doPartialWrites(data)
})
})
Context("using DecodeFull", func() {
It("decodes nothing", func() {
data, err := NewDecoder(nil).DecodeFull([]byte{})
Expect(err).ToNot(HaveOccurred())
Expect(data).To(BeEmpty())
})
It("decodes multiple entries", func() {
buf := &bytes.Buffer{}
enc := NewEncoder(buf)
Expect(enc.WriteField(HeaderField{Name: "foo", Value: "bar"})).To(Succeed())
Expect(enc.WriteField(HeaderField{Name: "lorem", Value: "ipsum"})).To(Succeed())
data, err := NewDecoder(nil).DecodeFull(buf.Bytes())
Expect(err).ToNot(HaveOccurred())
Expect(data).To(Equal([]HeaderField{
{Name: "foo", Value: "bar"},
{Name: "lorem", Value: "ipsum"},
}))
})
It("returns an error if the data is incomplete", func() {
buf := &bytes.Buffer{}
enc := NewEncoder(buf)
Expect(enc.WriteField(HeaderField{Name: "foo", Value: "bar"})).To(Succeed())
_, err := NewDecoder(nil).DecodeFull(buf.Bytes()[:buf.Len()-2])
Expect(err).To(MatchError("decoding error: truncated headers"))
})
It("restores the emitFunc afterwards", func() {
var emitFuncCalled bool
emitFunc := func(HeaderField) {
emitFuncCalled = true
}
decoder := NewDecoder(emitFunc)
buf := &bytes.Buffer{}
enc := NewEncoder(buf)
Expect(enc.WriteField(HeaderField{Name: "foo", Value: "bar"})).To(Succeed())
_, err := decoder.DecodeFull(buf.Bytes())
Expect(err).ToNot(HaveOccurred())
Expect(emitFuncCalled).To(BeFalse())
_, err = decoder.Write(buf.Bytes())
Expect(err).ToNot(HaveOccurred())
Expect(emitFuncCalled).To(BeTrue())
})
})
})
|
