You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hpack.go
    path of file: ./repos/streamdal/apps/cli/vendor/golang.org/x/net/http2/hpack
    
    the code of the file until where you have to start completion: // 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 hpack implements HPACK, a compression format for
// efficiently representing HTTP header fields in the context of HTTP/2.
//
// See http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-09
package hpack

import (
	"bytes"
	"errors"
	"fmt"
)

// A DecodingError is something the spec defines as a decoding error.
type DecodingError struct {
	Err error
}

func (de DecodingError) Error() string {
	return fmt.Sprintf("decoding error: %v", de.Err)
}

// An InvalidIndexError is returned when an encoder r
    
func (d *Decoder) parseHeaderFieldRepr() error {
	b := d.buf[0]
	switch {
	case b&128 != 0:
		// Indexed representation.
		// High bit set?
		// https://httpwg.org/specs/rfc7541.html#rfc.section.6.1
		return d.parseFieldIndexed()
	case b&192 == 64:
		// 6.2.1 Literal Header Field with Incremental Indexing
		// 0b10xxxxxx: top two bits are 10
		// https://httpwg.org/specs/rfc7541.html#rfc.section.6.2.1
		return d.parseFieldLiteral(6, indexedTrue)
	case b&240 == 0:
		// 6.2.2 Literal Header Field without Indexing
		// 0b0000xxxx: top four bits are 0000
		// https://httpwg.org/specs/rfc7541.html#rfc.section.6.2.2
		return d.parseFieldLiteral(4, indexedFalse)
	case b&240 == 16:
		// 6.2.3 Literal Header Field never Indexed
		// 0b0001xxxx: top four bits are 0001
		// https://httpwg.org/specs/rfc7541.html#rfc.section.6.2.3
		return d.parseFieldLiteral(4, indexedNever)
	case b&224 == 32:
		// 6.3 Dynamic Table Size Update
		// Top three bits are '001'.
		// https://httpwg.org/specs/rfc7541.html#rfc.section.6.3
		return d.parseDynamicTableSizeUpdate()
	}

	return DecodingError{errors.New("invalid encoding")}
}