vendor/golang.org/x/net/http2/frame.go

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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package http2

import (
	"bytes"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"log"
	"strings"
	"sync"

	"golang.org/x/net/http/httpguts"
	"golang.org/x/net/http2/hpack"
)

const frameHeaderLen = 9

var padZeros = make([]byte, 255) // zeros for padding

// A FrameType is a registered frame type as defined in
// http://http2.github.io/http2-spec/#rfc.section.11.2
type FrameType uint8

const (
	FrameData         FrameType = 0x0
	FrameHeaders      FrameType = 0x1
	FramePriority     FrameType = 0x2
	FrameRSTStream    FrameType = 0x3
	FrameSettings     FrameType = 0x4
	FramePushPromise  FrameType = 0x5
	FramePing         FrameType = 0x6
	FrameGoAway       FrameType = 0x7
	FrameWindowUpdate FrameType = 0x8
	FrameContinuation FrameType = 0x9
)

var frameName = map[FrameType]string{
	FrameData:         "DATA",
	FrameHeaders:      "HEADERS",
	FramePriority:     "PRIORITY",
	FrameRSTStream:    "RST_STREAM",
	FrameSettings:     "SETTINGS",
	FramePushPromise:  "PUSH_PROMISE",
	FramePing:         "PING",
	FrameGoAway:       "GOAWAY",
	FrameWindowUpdate: "WINDOW_UPDATE",
	FrameContinuation: "CONTINUATION",
}

func (t FrameType) String() string {
	if s, ok := frameName[t]; ok {
		return s
	}
	return fmt.Sprintf("UNKNOWN_FRAME_TYPE_%d", uint8(t))
}