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: charset.go
    path of file: ./repos/hoverfly/vendor/golang.org/x/net/html/charset
    
    the code of the file until where you have to start completion: // Copyright 2013 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 charset provides common text encodings for HTML documents.
//
// The mapping from encoding labels to encodings is defined at
// https://encoding.spec.whatwg.org/.
package charset // import "golang.org/x/net/html/charset"

import
    
func DetermineEncoding(content []byte, contentType string) (e encoding.Encoding, name string, certain bool) {
	if len(content) > 1024 {
		content = content[:1024]
	}

	for _, b := range boms {
		if bytes.HasPrefix(content, b.bom) {
			e, name = Lookup(b.enc)
			return e, name, true
		}
	}

	if _, params, err := mime.ParseMediaType(contentType); err == nil {
		if cs, ok := params["charset"]; ok {
			if e, name = Lookup(cs); e != nil {
				return e, name, true
			}
		}
	}

	if len(content) > 0 {
		e, name = prescan(content)
		if e != nil {
			return e, name, false
		}
	}

	// Try to detect UTF-8.
	// First eliminate any partial rune at the end.
	for i := len(content) - 1; i >= 0 && i > len(content)-4; i-- {
		b := content[i]
		if b < 0x80 {
			break
		}
		if utf8.RuneStart(b) {
			content = content[:i]
			break
		}
	}
	hasHighBit := false
	for _, c := range content {
		if c >= 0x80 {
			hasHighBit = true
			break
		}
	}
	if hasHighBit && utf8.Valid(content) {
		return encoding.Nop, "utf-8", false
	}

	// TODO: change default depending on user's locale?
	return charmap.Windows1252, "windows-1252", false
}