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// Copyright 2017 FoxyUtils ehf. All rights reserved.
// Use of this source code is governed by the terms of the Affero GNU General
// Public License version 3.0 as published by the Free Software Foundation and
// appearing in the file LICENSE included in the packaging of this file. A
// commercial license can be purchased by contacting
package zippkg
import (
// XMLHeader is a header that MarshalXML uses to prefix the XML files it creates.
const XMLHeader = `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>` + "\n"
var nl = []byte{'\r', '\n'}
func MarshalXMLByTypeIndex(z *zip.Writer, dt unioffice.DocType, typ string, idx int, v interface{}) error {
fn := unioffice.AbsoluteFilename(dt, typ, idx)
return MarshalXML(z, fn, v)
func MarshalXMLByType(z *zip.Writer, dt unioffice.DocType, typ string, v interface{}) error {
fn := unioffice.AbsoluteFilename(dt, typ, 0)
return MarshalXML(z, fn, v)
// MarshalXML creates a file inside of a zip and marshals an object as xml, prefixing it
// with a standard XML header.
func MarshalXML(z *zip.Writer, filename string, v interface{}) error {
fh := &zip.FileHeader{}
fh.Method = zip.Deflate
fh.Name = filename
w, err := z.CreateHeader(fh)
if err != nil {
return fmt.Errorf("creating %s in zip: %s", filename, err)
_, err = w.Write([]byte(XMLHeader))
if err != nil {
return fmt.Errorf("creating xml header to %s: %s", filename, err)
if err = xml.NewEncoder(SelfClosingWriter{w}).Encode(v); err != nil {
return fmt.Errorf("marshaling %s: %s", filename, err)
_, err = w.Write(nl)
return err
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