Read out short vecs and ascii from ifds

src/decoder/mod.rs

@@ -728,6 +728,10 @@ impl<R: Read + Seek> Decoder<R> {
     pub fn get_tag_u32_vec(&mut self, tag: Tag) -> TiffResult<Vec<u32>> {
         self.get_tag(tag)?.into_u32_vec()
     }
+
+    pub fn get_tag_u16_vec(&mut self, tag: Tag) -> TiffResult<Vec<u16>> {
+        self.get_tag(tag)?.into_u16_vec()
+    }
     pub fn get_tag_u64_vec(&mut self, tag: Tag) -> TiffResult<Vec<u64>> {
         self.get_tag(tag)?.into_u64_vec()
     }
@@ -747,6 +751,11 @@ impl<R: Read + Seek> Decoder<R> {
         self.get_tag(tag)?.into_u8_vec()
     }
 
+    /// Tries to retrieve a tag and convert it to a ascii vector.
+    pub fn get_tag_ascii_string(&mut self, tag: Tag) -> TiffResult<String> {
+        self.get_tag(tag)?.into_string()
+    }
+
     /// Decompresses the strip into the supplied buffer.
     /// Returns the number of bytes read.
     fn expand_strip<'a>(