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header.go
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header.go
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// Copyright 2013-14, Amahi. All rights reserved.
// Use of this source code is governed by the
// license that can be found in the LICENSE file.
// This file contains header-handling functions
// The header dictionary came from the SPDY standard.
// Some of the functions came from Jamie Hall's
// SPDY go library.
package spdy
import (
"bytes"
"compress/zlib"
"encoding/binary"
"io"
"net/http"
"strings"
"sync"
)
type hrSource struct {
r io.Reader
m sync.RWMutex
c *sync.Cond
}
func (src *hrSource) Read(p []byte) (n int, err error) {
src.m.RLock()
for src.r == nil {
src.c.Wait()
}
n, err = src.r.Read(p)
src.m.RUnlock()
if err == io.EOF {
src.change(nil)
err = nil
}
return
}
func (src *hrSource) change(r io.Reader) {
src.m.Lock()
defer src.m.Unlock()
src.r = r
src.c.Broadcast()
}
// A headerReader reads zlib-compressed headers from discontiguous sources.
type headerReader struct {
source hrSource
decompressor io.ReadCloser
}
// newHeaderReader creates a headerReader with the initial dictionary.
func newHeaderReader() (hr *headerReader) {
hr = new(headerReader)
hr.source.c = sync.NewCond(hr.source.m.RLocker())
return
}
// ReadHeader reads a set of headers from a reader.
func (hr *headerReader) readHeader(r io.Reader) (h http.Header, err error) {
hr.source.change(r)
h, err = hr.read()
return
}
// Decode reads a set of headers from a block of bytes.
func (hr *headerReader) decode(data []byte) (h http.Header, err error) {
hr.source.change(bytes.NewBuffer(data))
h, err = hr.read()
return
}
func (hr *headerReader) read() (h http.Header, err error) {
var count uint32
if hr.decompressor == nil {
hr.decompressor, err = zlib.NewReaderDict(&hr.source, headerDictionary)
if err != nil {
return
}
}
err = binary.Read(hr.decompressor, binary.BigEndian, &count)
if err != nil {
return
}
h = make(http.Header, int(count))
for i := 0; i < int(count); i++ {
var name, value string
name, err = readHeaderString(hr.decompressor)
if err != nil {
return
}
value, err = readHeaderString(hr.decompressor)
if err != nil {
return
}
valueList := strings.Split(string(value), "\x00")
for _, v := range valueList {
h.Add(name, v)
}
}
return
}
func readHeaderString(r io.Reader) (s string, err error) {
var length uint32
err = binary.Read(r, binary.BigEndian, &length)
if err != nil {
return
}
data := make([]byte, int(length))
_, err = io.ReadFull(r, data)
if err != nil {
return
}
return string(data), nil
}
// write zlib-compressed headers on different streams
type headerWriter struct {
compressor *zlib.Writer
buffer *bytes.Buffer
}
// creates a headerWriter ready to compress headers
func newHeaderWriter() (hw *headerWriter) {
hw = &headerWriter{buffer: new(bytes.Buffer)}
hw.compressor, _ = zlib.NewWriterLevelDict(hw.buffer, zlib.BestCompression, headerDictionary)
return
}
// write a header block directly to a writer
func (hw *headerWriter) writeHeader(w io.Writer, h http.Header) (err error) {
hw.write(h)
_, err = io.Copy(w, hw.buffer)
hw.buffer.Reset()
return
}
// Encode returns a compressed header block.
func (hw *headerWriter) encode(h http.Header) (data []byte) {
hw.write(h)
data = make([]byte, hw.buffer.Len())
hw.buffer.Read(data)
return
}
func (hw *headerWriter) write(h http.Header) {
binary.Write(hw.compressor, binary.BigEndian, uint32(len(h)))
for k, vals := range h {
k = strings.ToLower(k)
binary.Write(hw.compressor, binary.BigEndian, uint32(len(k)))
binary.Write(hw.compressor, binary.BigEndian, []byte(k))
v := strings.Join(vals, "\x00")
binary.Write(hw.compressor, binary.BigEndian, uint32(len(v)))
binary.Write(hw.compressor, binary.BigEndian, []byte(v))
}
hw.compressor.Flush()
}
// compression header for SPDY/3
var headerDictionary = []byte{
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