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package http2interop
import (
"encoding/binary"
"fmt"
"io"
)
const (
SETTINGS_ACK = 1
)
type SettingsFrame struct {
Header FrameHeader
Params []SettingsParameter
}
type SettingsIdentifier uint16
const (
SettingsHeaderTableSize SettingsIdentifier = 1
SettingsEnablePush SettingsIdentifier = 2
SettingsMaxConcurrentStreams SettingsIdentifier = 3
SettingsInitialWindowSize SettingsIdentifier = 4
SettingsMaxFrameSize SettingsIdentifier = 5
SettingsMaxHeaderListSize SettingsIdentifier = 6
)
const (
SETTINGS_FLAG_ACK byte = 0x01
)
func (si SettingsIdentifier) String() string {
switch si {
case SettingsHeaderTableSize:
return "SETTINGS_HEADER_TABLE_SIZE"
case SettingsEnablePush:
return "SETTINGS_ENABLE_PUSH"
case SettingsMaxConcurrentStreams:
return "SETTINGS_MAX_CONCURRENT_STREAMS"
case SettingsInitialWindowSize:
return "SETTINGS_INITIAL_WINDOW_SIZE"
case SettingsMaxFrameSize:
return "SETTINGS_MAX_FRAME_SIZE"
case SettingsMaxHeaderListSize:
return "SETTINGS_MAX_HEADER_LIST_SIZE"
default:
return fmt.Sprintf("SETTINGS_UNKNOWN(%d)", uint16(si))
}
}
type SettingsParameter struct {
Identifier SettingsIdentifier
Value uint32
}
func (f *SettingsFrame) GetHeader() *FrameHeader {
return &f.Header
}
func (f *SettingsFrame) ParsePayload(r io.Reader) error {
raw := make([]byte, f.Header.Length)
if _, err := io.ReadFull(r, raw); err != nil {
return err
}
return f.UnmarshalPayload(raw)
}
func (f *SettingsFrame) UnmarshalPayload(raw []byte) error {
if f.Header.Length != len(raw) {
return fmt.Errorf("Invalid Payload length %d != %d", f.Header.Length, len(raw))
}
if f.Header.Length%6 != 0 {
return fmt.Errorf("Invalid Payload length %d", f.Header.Length)
}
f.Params = make([]SettingsParameter, 0, f.Header.Length/6)
for i := 0; i < len(raw); i += 6 {
f.Params = append(f.Params, SettingsParameter{
Identifier: SettingsIdentifier(binary.BigEndian.Uint16(raw[i : i+2])),
Value: binary.BigEndian.Uint32(raw[i+2 : i+6]),
})
}
return nil
}
func (f *SettingsFrame) MarshalPayload() ([]byte, error) {
raw := make([]byte, len(f.Params)*6)
for i, p := range f.Params {
binary.BigEndian.PutUint16(raw[i*6:i*6+2], uint16(p.Identifier))
binary.BigEndian.PutUint32(raw[i*6+2:i*6+6], p.Value)
}
return raw, nil
}
func (f *SettingsFrame) MarshalBinary() ([]byte, error) {
payload, err := f.MarshalPayload()
if err != nil {
return nil, err
}
f.Header.Length = len(payload)
f.Header.Type = SettingsFrameType
header, err := f.Header.MarshalBinary()
if err != nil {
return nil, err
}
header = append(header, payload...)
return header, nil
}
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