Add method `SetProducer`

This allows changing or removing the PDF producer string in the metadata of the PDF file.

2 files changed, 14 insertions, 1 deletions

diff --git a/def.go b/def.go
index efa573e..95da6ba 100644
--- a/def.go
+++ b/def.go
@@ -563,6 +563,7 @@ type Fpdf struct {
 	zoomMode         string                     // zoom display mode
 	layoutMode       string                     // layout display mode
 	xmp              []byte                     // XMP metadata
+	producer         string                     // producer
 	title            string                     // title
 	subject          string                     // subject
 	author           string                     // author
diff --git a/fpdf.go b/fpdf.go
index 28f69cf..377f152 100644
--- a/fpdf.go
+++ b/fpdf.go
@@ -198,6 +198,7 @@ func fpdfNew(orientationStr, unitStr, sizeStr, fontDirStr string, size SizeType)
 	f.gradientList = append(f.gradientList, gradientType{}) // gradientList[0] is unused
 	// Set default PDF version number
 	f.pdfVersion = "1.3"
+	f.SetProducer("FPDF "+cnFpdfVersion, true)
 	f.layerInit()
 	f.catalogSort = gl.catalogSort
 	f.creationDate = gl.creationDate
@@ -559,6 +560,15 @@ func (f *Fpdf) SetCompression(compress bool) {
 	f.compress = compress
 }
 
+// SetProducer defines the producer of the document. isUTF8 indicates if the string
+// is encoded in ISO-8859-1 (false) or UTF-8 (true).
+func (f *Fpdf) SetProducer(producerStr string, isUTF8 bool) {
+	if isUTF8 {
+		producerStr = utf8toutf16(producerStr)
+	}
+	f.producer = producerStr
+}
+
 // SetTitle defines the title of the document. isUTF8 indicates if the string
 // is encoded in ISO-8859-1 (false) or UTF-8 (true).
 func (f *Fpdf) SetTitle(titleStr string, isUTF8 bool) {
@@ -4473,7 +4483,9 @@ func (f *Fpdf) putresources() {
 
 func (f *Fpdf) putinfo() {
 	var tm time.Time
-	f.outf("/Producer %s", f.textstring("FPDF "+cnFpdfVersion))
+	if len(f.producer) > 0 {
+		f.outf("/Producer %s", f.textstring(f.producer))
+	}
 	if len(f.title) > 0 {
 		f.outf("/Title %s", f.textstring(f.title))
 	}