Merge branch 'd1ngd0-ftr/gob'

1 files changed, 32 insertions, 1 deletions

diff --git a/def.go b/def.go
index b4140a9..605cdbc 100644
--- a/def.go
+++ b/def.go
@@ -18,6 +18,7 @@ package gofpdf
 
 import (
 	"bytes"
+	"encoding/gob"
 	"io"
 	"time"
 )
@@ -157,7 +158,9 @@ func (p PointType) XY() (float64, float64) {
 	return p.X, p.Y
 }
 
-// ImageInfoType contains size, color and other information about an image
+// ImageInfoType contains size, color and other information about an image.
+// Changes to this structure should be reflected in its GobEncode and GobDecode
+// methods.
 type ImageInfoType struct {
 	data  []byte
 	smask []byte
@@ -175,6 +178,34 @@ type ImageInfoType struct {
 	dpi   float64
 }
 
+// GobEncode encodes the receiving image to a byte slice.
+func (info *ImageInfoType) GobEncode() (buf []byte, err error) {
+	fields := []interface{}{info.data, info.smask, info.i, info.n, info.w, info.h, info.cs,
+		info.pal, info.bpc, info.f, info.dp, info.trns, info.scale, info.dpi}
+	w := new(bytes.Buffer)
+	encoder := gob.NewEncoder(w)
+	for j := 0; j < len(fields) && err == nil; j++ {
+		err = encoder.Encode(fields[j])
+	}
+	if err == nil {
+		buf = w.Bytes()
+	}
+	return
+}
+
+// GobDecode decodes the specified byte buffer (generated by GobEncode) into
+// the receiving image.
+func (info *ImageInfoType) GobDecode(buf []byte) (err error) {
+	fields := []interface{}{&info.data, &info.smask, &info.i, &info.n, &info.w, &info.h,
+		&info.cs, &info.pal, &info.bpc, &info.f, &info.dp, &info.trns, &info.scale, &info.dpi}
+	r := bytes.NewBuffer(buf)
+	decoder := gob.NewDecoder(r)
+	for j := 0; j < len(fields) && err == nil; j++ {
+		err = decoder.Decode(fields[j])
+	}
+	return
+}
+
 // PointConvert returns the value of pt, expressed in points (1/72 inch), as a
 // value expressed in the unit of measure specified in New(). Since font
 // management in Fpdf uses points, this method can help with line height