Add support for IEEEFP 32 and 64 bit encoding

src/encoder/writer.rs

@@ -93,6 +93,20 @@ impl<W: Write> TiffWriter<W> {
         Ok(())
     }
 
+    pub fn write_f32(&mut self, n: f32) -> Result<(), io::Error> {
+        self.writer.write_f32::<NativeEndian>(n)?;
+        self.offset += 4;
+
+        Ok(())
+    }
+
+    pub fn write_f64(&mut self, n: f64) -> Result<(), io::Error> {
+        self.writer.write_f64::<NativeEndian>(n)?;
+        self.offset += 8;
+
+        Ok(())
+    }
+
     pub fn pad_word_boundary(&mut self) -> Result<(), io::Error> {
         if self.offset % 4 != 0 {
             let padding = [0, 0, 0];