diff --git a/pkg/ifd/entry.go b/pkg/ifd/entry.go
index 130cd6e..5aefa98 100644
--- a/pkg/ifd/entry.go
+++ b/pkg/ifd/entry.go
@@ -10,6 +10,10 @@ package metadata
 
 /*****************************************************************************************************************/
 
+import "encoding/binary"
+
+/*****************************************************************************************************************/
+
 // An IFDEntry is a single entry in an Image File Directory.
 // A value of type DataTypeRational is composed of two 32-bit values,
 // thus data contains two uints (numerator and denominator) for a single number.
@@ -20,3 +24,23 @@ type IFDEntry struct {
 }
 
 /*****************************************************************************************************************/
+
+func (e IFDEntry) PutData(p []byte) {
+	enc := binary.LittleEndian
+
+	for _, d := range e.Data {
+		switch e.DataType {
+		case DataTypeByte, DataTypeASCII:
+			p[0] = byte(d)
+			p = p[1:]
+		case DataTypeShort:
+			enc.PutUint16(p, uint16(d))
+			p = p[2:]
+		case DataTypeLong, DataTypeRational:
+			enc.PutUint32(p, uint32(d))
+			p = p[4:]
+		}
+	}
+}
+
+/*****************************************************************************************************************/