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: huffman.go
    path of file: ./repos/moby/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

import (
	"bytes"
	"errors"
	"io"
	"sync"
)

var bufPool = sync.Pool{
	New: func() interface{} { return new(bytes.Buffer) },
}

// HuffmanDecode decodes the string in v and writes the expanded
// result to w, returning the number of bytes written to w and the
// Write call's return value. At most one Write call is made.
func HuffmanDecode(w io.Writer, v []byte) (int, error) {
	buf := bufPool.Get().(*bytes.Buffer)
	buf.Reset()
	defer bufPool.Put(buf)
	if err := huffmanDecode(buf, 0, v); err != nil {
		return 0, err
	}
	return w.Write(buf.Bytes())
}

// HuffmanDecodeToString decodes the string in v.
func HuffmanD
    
func huffmanDecode(buf *bytes.Buffer, maxLen int, v []byte) error {
	rootHuffmanNode := getRootHuffmanNode()
	n := rootHuffmanNode
	// cur is the bit buffer that has not been fed into n.
	// cbits is the number of low order bits in cur that are valid.
	// sbits is the number of bits of the symbol prefix being decoded.
	cur, cbits, sbits := uint(0), uint8(0), uint8(0)
	for _, b := range v {
		cur = cur<<8 | uint(b)
		cbits += 8
		sbits += 8
		for cbits >= 8 {
			idx := byte(cur >> (cbits - 8))
			n = n.children[idx]
			if n == nil {
				return ErrInvalidHuffman
			}
			if n.children == nil {
				if maxLen != 0 && buf.Len() == maxLen {
					return ErrStringLength
				}
				buf.WriteByte(n.sym)
				cbits -= n.codeLen
				n = rootHuffmanNode
				sbits = cbits
			} else {
				cbits -= 8
			}
		}
	}
	for cbits > 0 {
		n = n.children[byte(cur<<(8-cbits))]
		if n == nil {
			return ErrInvalidHuffman
		}
		if n.children != nil || n.codeLen > cbits {
			break
		}
		if maxLen != 0 && buf.Len() == maxLen {
			return ErrStringLength
		}
		buf.WriteByte(n.sym)
		cbits -= n.codeLen
		n = rootHuffmanNode
		sbits = cbits
	}
	if sbits > 7 {
		// Either there was an incomplete symbol, or overlong padding.
		// Both are decoding errors per RFC 7541 section 5.2.
		return ErrInvalidHuffman
	}
	if mask := uint(1<<cbits - 1); cur&mask != mask {
		// Trailing bits must be a prefix of EOS per RFC 7541 section 5.2.
		return ErrInvalidHuffman
	}

	return nil
}