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window_update.go
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window_update.go
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// Copyright 2014 Jamie Hall. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package frames
import (
"bytes"
"errors"
"fmt"
"io"
"github.com/SlyMarbo/spdy/common"
)
type WINDOW_UPDATE struct {
StreamID common.StreamID
DeltaWindowSize uint32
subversion int
}
func (frame *WINDOW_UPDATE) Compress(comp common.Compressor) error {
return nil
}
func (frame *WINDOW_UPDATE) Decompress(decomp common.Decompressor) error {
return nil
}
func (frame *WINDOW_UPDATE) Name() string {
return "WINDOW_UPDATE"
}
func (frame *WINDOW_UPDATE) ReadFrom(reader io.Reader) (int64, error) {
c := common.ReadCounter{R: reader}
data, err := common.ReadExactly(&c, 16)
if err != nil {
return c.N, err
}
err = controlFrameCommonProcessing(data[:5], _WINDOW_UPDATE, 0)
if err != nil {
return c.N, err
}
// Get and check length.
length := int(common.BytesToUint24(data[5:8]))
if length != 8 {
return c.N, common.IncorrectDataLength(length, 8)
}
frame.StreamID = common.StreamID(common.BytesToUint32(data[8:12]))
frame.DeltaWindowSize = common.BytesToUint32(data[12:16])
if !frame.StreamID.Valid() {
return c.N, common.StreamIdTooLarge
}
if frame.StreamID.Zero() && frame.subversion == 0 {
return c.N, common.StreamIdIsZero
}
if frame.DeltaWindowSize > common.MAX_DELTA_WINDOW_SIZE {
return c.N, errors.New("Error: Delta Window Size too large.")
}
return c.N, nil
}
func (frame *WINDOW_UPDATE) String() string {
buf := new(bytes.Buffer)
buf.WriteString("WINDOW_UPDATE {\n\t")
buf.WriteString(fmt.Sprintf("Version: 3\n\t"))
buf.WriteString(fmt.Sprintf("Stream ID: %d\n\t", frame.StreamID))
buf.WriteString(fmt.Sprintf("Delta window size: %d\n}\n", frame.DeltaWindowSize))
return buf.String()
}
func (frame *WINDOW_UPDATE) WriteTo(writer io.Writer) (int64, error) {
c := common.WriteCounter{W: writer}
out := make([]byte, 16)
out[0] = 128 // Control bit and Version
out[1] = 3 // Version
out[2] = 0 // Type
out[3] = 9 // Type
out[4] = 0 // Flags
out[5] = 0 // Length
out[6] = 0 // Length
out[7] = 8 // Length
out[8] = frame.StreamID.B1() // Stream ID
out[9] = frame.StreamID.B2() // Stream ID
out[10] = frame.StreamID.B3() // Stream ID
out[11] = frame.StreamID.B4() // Stream ID
out[12] = byte(frame.DeltaWindowSize>>24) & 0x7f // Delta Window Size
out[13] = byte(frame.DeltaWindowSize >> 16) // Delta Window Size
out[14] = byte(frame.DeltaWindowSize >> 8) // Delta Window Size
out[15] = byte(frame.DeltaWindowSize) // Delta Window Size
err := common.WriteExactly(&c, out)
if err != nil {
return c.N, err
}
return c.N, nil
}