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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
package messages
import (
"bytes"
"fmt"
"io"
)
type channelOpen struct {
senderChannel uint32
initialWindowSize uint32
maximumPacketSize uint32
}
const (
defaultInitialWindowSize = 1024 * 1024
defaultMaximumPacketSize = 16 * 1024
)
func newChannelOpen(senderChannel uint32, initialWindowSize uint32, maximumPacketSize uint32) *channelOpen {
if initialWindowSize == 0 {
initialWindowSize = defaultInitialWindowSize
}
if maximumPacketSize == 0 {
maximumPacketSize = defaultMaximumPacketSize
}
return &channelOpen{
senderChannel: senderChannel,
initialWindowSize: initialWindowSize,
maximumPacketSize: maximumPacketSize,
}
}
func (c *channelOpen) marshal() ([]byte, error) {
buf := new(bytes.Buffer)
if err := writeUint32(buf, c.senderChannel); err != nil {
return nil, fmt.Errorf("failed to write sender channel: %w", err)
}
if err := writeUint32(buf, c.initialWindowSize); err != nil {
return nil, fmt.Errorf("failed to write initial window size: %w", err)
}
if err := writeUint32(buf, c.maximumPacketSize); err != nil {
return nil, fmt.Errorf("failed to write maximum packet size: %w", err)
}
return buf.Bytes(), nil
}
func (c *channelOpen) unmarshal(buf io.Reader) (err error) {
c.senderChannel, err = readUint32(buf)
if err != nil {
return fmt.Errorf("failed to read sender channel: %w", err)
}
c.initialWindowSize, err = readUint32(buf)
if err != nil {
return fmt.Errorf("failed to read initial window size: %w", err)
}
c.maximumPacketSize, err = readUint32(buf)
if err != nil {
return fmt.Errorf("failed to read maximum packet size: %w", err)
}
return nil
}
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