From 0e5c39bf5495154aa9dfd140db18db7345d7b824 Mon Sep 17 00:00:00 2001
From: Alexander Eichhorn <alex@kidtsunami.com>
Date: Wed, 30 Aug 2017 15:12:34 +0200
Subject: add xmp metadata output

---
 def.go  |  1 +
 fpdf.go | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/def.go b/def.go
index 552415f..fd6ef81 100644
--- a/def.go
+++ b/def.go
@@ -224,6 +224,7 @@ type Fpdf struct {
 	footerFncLpi     func(bool)                // function provided by app and called to write footer with last page flag
 	zoomMode         string                    // zoom display mode
 	layoutMode       string                    // layout display mode
+	xmp              []byte                    // XMP metadata
 	title            string                    // title
 	subject          string                    // subject
 	author           string                    // author
diff --git a/fpdf.go b/fpdf.go
index 27e0c98..3009dd7 100644
--- a/fpdf.go
+++ b/fpdf.go
@@ -510,6 +510,11 @@ func (f *Fpdf) SetCreator(creatorStr string, isUTF8 bool) {
 	f.creator = creatorStr
 }
 
+// SetXmpMetadata defines XMP metadata that will be embedded with the document.
+func (f *Fpdf) SetXmpMetadata(xmpStream []byte) {
+	f.xmp = xmpStream
+}
+
 // AliasNbPages defines an alias for the total number of pages. It will be
 // substituted as the document is closed. An empty string is replaced with the
 // string "{nb}".
@@ -3650,6 +3655,16 @@ func (f *Fpdf) puttrailer() {
 	}
 }
 
+func (f *Fpdf) putxmp() {
+	if len(f.xmp) == 0 {
+		return
+	}
+	f.newobj()
+	f.outf("<< /Type /Metadata /Subtype /XML /Length %d >>", len(f.xmp))
+	f.putstream(f.xmp)
+	f.out("endobj")
+}
+
 func (f *Fpdf) putbookmarks() {
 	nb := len(f.outlines)
 	if nb > 0 {
@@ -3722,6 +3737,8 @@ func (f *Fpdf) enddoc() {
 	f.putinfo()
 	f.out(">>")
 	f.out("endobj")
+	// Metadata
+	f.putxmp()
 	// 	Catalog
 	f.newobj()
 	f.out("<<")
-- 
cgit v1.2.1-24-ge1ad