Fix clippy lints

.gitignore

@@ -0,0 +1,2 @@
+target/
+/Cargo.lock

src/isobmff.rs

@@ -88,7 +88,7 @@ struct Location {
 impl<R> Parser<R> where R: BufRead + Seek {
     fn new(reader: R) -> Self {
         Self {
-            reader: reader,
+            reader,
             ftyp_checked: false,
             item_id: None,
             item_location: None,
@@ -127,7 +127,7 @@ impl<R> Parser<R> where R: BufRead + Seek {
         let mut buf = [0; 8];
         self.reader.read_exact(&mut buf)?;
         let size = match BigEndian::loadu32(&buf, 0) {
-            0 => Some(std::u64::MAX),
+            0 => Some(u64::MAX),
             1 => read64(&mut self.reader)?.checked_sub(16),
             x => u64::from(x).checked_sub(8),
         }.ok_or("Invalid box size")?;
@@ -138,7 +138,7 @@ impl<R> Parser<R> where R: BufRead + Seek {
     fn read_file_level_box(&mut self, size: u64) -> Result<Vec<u8>, Error> {
         let mut buf;
         match size {
-            std::u64::MAX => {
+            u64::MAX => {
                 buf = Vec::new();
                 self.reader.read_to_end(&mut buf)?;
             },
@@ -154,7 +154,7 @@ impl<R> Parser<R> where R: BufRead + Seek {
 
     fn skip_file_level_box(&mut self, size: u64) -> Result<(), Error> {
         match size {
-            std::u64::MAX => self.reader.seek(SeekFrom::End(0))?,
+            u64::MAX => self.reader.seek(SeekFrom::End(0))?,
             _ => self.reader.seek(SeekFrom::Current(
                 size.try_into().or(Err("Large seek not supported"))?))?,
         };
@@ -164,7 +164,7 @@ impl<R> Parser<R> where R: BufRead + Seek {
     fn parse_ftyp(&mut self, mut boxp: BoxSplitter) -> Result<(), Error> {
         let head = boxp.slice(8)?;
         let _major_brand = &head[0..4];
-        let _minor_version = BigEndian::loadu32(&head, 4);
+        let _minor_version = BigEndian::loadu32(head, 4);
         while let Ok(compat_brand) = boxp.array4() {
             if HEIF_BRANDS.contains(&compat_brand) {
                 return Ok(());
@@ -301,9 +301,8 @@ impl<R> Parser<R> where R: BufRead + Seek {
         };
         for _ in 0..entry_count {
             let (boxtype, body) = boxp.child_box()?;
-            match boxtype {
-                b"infe" => self.parse_infe(body)?,
-                _ => {},
+            if boxtype == b"infe" {
+                self.parse_infe(body)?
             }
         }
         Ok(())
@@ -483,7 +482,7 @@ mod tests {
         // to the end of the file
         let mut p = Parser::new(Cursor::new(b"\0\0\0\0abcd"));
         assert_eq!(p.read_box_header().unwrap(),
-                   Some((std::u64::MAX, *b"abcd")));
+                   Some((u64::MAX, *b"abcd")));
         // largesize
         let mut p = Parser::new(Cursor::new(
             b"\0\0\0\x01abcd\0\0\0\0\0\0\0\x10"));
@@ -498,7 +497,7 @@ mod tests {
         let mut p = Parser::new(Cursor::new(
             b"\0\0\0\x01abcd\xff\xff\xff\xff\xff\xff\xff\xff"));
         assert_eq!(p.read_box_header().unwrap(),
-                   Some((std::u64::MAX.wrapping_sub(16), *b"abcd")));
+                   Some((u64::MAX.wrapping_sub(16), *b"abcd")));
     }
 
     #[test]

src/reader.rs

@@ -63,6 +63,12 @@ pub struct Reader {
     continue_on_error: bool,
 }
 
+impl Default for Reader {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Reader {
     /// Constructs a new `Reader`.
     pub fn new() -> Self {
@@ -106,14 +112,14 @@ impl Reader {
     /// If an error occurred, `exif::Error` is returned.
     pub fn read_raw(&self, data: Vec<u8>) -> Result<Exif, Error> {
         let mut parser = tiff::Parser::new();
-        parser.continue_on_error = self.continue_on_error.then(|| Vec::new());
+        parser.continue_on_error = self.continue_on_error.then(Vec::new);
         parser.parse(&data)?;
         let entry_map = parser.entries.iter().enumerate()
             .map(|(i, e)| (e.ifd_num_tag(), i)).collect();
         let exif = Exif {
             buf: data,
             entries: parser.entries,
-            entry_map: entry_map,
+            entry_map,
             little_endian: parser.little_endian,
         };
         match parser.continue_on_error {

src/tag.rs

@@ -749,10 +749,10 @@ generate_well_known_tag_constants!(
 );
 
 // For Value::display_as().
-pub fn display_value_as<'a>(value: &'a Value, tag: Tag) -> value::Display<'a> {
+pub fn display_value_as(value: &Value, tag: Tag) -> value::Display<'_> {
     match get_tag_info(tag) {
-        Some(ti) => value::Display { fmt: ti.dispval, value: value },
-        None => value::Display { fmt: d_default, value: value },
+        Some(ti) => value::Display { fmt: ti.dispval, value },
+        None => value::Display { fmt: d_default, value },
     }
 }
 
@@ -1048,13 +1048,13 @@ fn d_subjarea(w: &mut dyn fmt::Write, value: &Value) -> fmt::Result {
 // Acceleration (Exif 0x9404), CameraElevationAngle (Exif 0x9405)
 fn d_optdecimal(w: &mut dyn fmt::Write, value: &Value) -> fmt::Result {
     match *value {
-        Value::Rational(ref v) if v.len() > 0 =>
+        Value::Rational(ref v) if !v.is_empty() =>
             if v[0].denom != 0xffffffff {
                 write!(w, "{}", v[0].to_f64())
             } else {
                 w.write_str("unknown")
             },
-        Value::SRational(ref v) if v.len() > 0 =>
+        Value::SRational(ref v) if !v.is_empty() =>
             if v[0].denom != -1 {
                 write!(w, "{}", v[0].to_f64())
             } else {
@@ -1463,7 +1463,7 @@ where I: IntoIterator<Item = T>, T: fmt::Display {
 
 struct AsciiDisplay<'a>(&'a [u8]);
 
-impl<'a> fmt::Display for AsciiDisplay<'a> {
+impl fmt::Display for AsciiDisplay<'_> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         d_sub_ascii(f, self.0)
     }

src/tiff.rs

@@ -239,7 +239,7 @@ impl Parser {
             }
             let entry = Self::parse_ifd_entry::<E>(data, offset);
             offset += 12;
-            let (tag, val) = match entry {
+            let (tag, value) = match entry {
                 Ok(x) => x,
                 Err(e) => {
                     self.check_error(e)?;
@@ -256,11 +256,11 @@ impl Parser {
                 Tag::InteropIFDPointer => Context::Interop,
                 _ => {
                     self.entries.push(IfdEntry { field: Field {
-                        tag: tag, ifd_num: In(ifd_num), value: val }.into()});
+                        tag, ifd_num: In(ifd_num), value }.into()});
                     continue;
                 },
             };
-            self.parse_child_ifd::<E>(data, val, child_ctx, ifd_num)
+            self.parse_child_ifd::<E>(data, value, child_ctx, ifd_num)
                 .or_else(|e| self.check_error(e))?;
         }
 
@@ -313,7 +313,10 @@ impl Parser {
 
     fn check_error(&mut self, err: Error) -> Result<(), Error> {
         match self.continue_on_error {
-            Some(ref mut v) => Ok(v.push(err)),
+            Some(ref mut v) => {
+                v.push(err);
+                Ok(())
+            },
             None => Err(err),
         }
     }
@@ -502,12 +505,12 @@ impl<'a> DisplayValue<'a> {
             ifd_num: self.ifd_num,
             value_display: self.value_display,
             unit: self.tag.unit(),
-            unit_provider: unit_provider,
+            unit_provider,
         }
     }
 }
 
-impl<'a> fmt::Display for DisplayValue<'a> {
+impl fmt::Display for DisplayValue<'_> {
     #[inline]
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         self.value_display.fmt(f)

src/util.rs

@@ -58,7 +58,7 @@ impl<T> BufReadExt for T where T: io::BufRead {
     fn discard_exact(&mut self, mut len: usize) -> io::Result<()> {
         while len > 0 {
             let consume_len = match self.fill_buf() {
-                Ok(buf) if buf.is_empty() =>
+                Ok([]) =>
                     return Err(io::Error::new(
                         io::ErrorKind::UnexpectedEof, "unexpected EOF")),
                 Ok(buf) => buf.len().min(len),
@@ -106,7 +106,7 @@ impl<T> ReadExt for T where T: io::Read {
 // This function must not be called with more than 4 bytes.
 pub fn atou16(bytes: &[u8]) -> Result<u16, Error> {
     debug_assert!(bytes.len() <= 4);
-    if bytes.len() == 0 {
+    if bytes.is_empty() {
         return Err(Error::InvalidFormat("Not a number"));
     }
     let mut n = 0;

src/value.rs

@@ -180,7 +180,7 @@ impl Value {
             Value::Short(ref v) =>
                 Some(UIntIter { iter: Box::new(v.iter().map(|&x| x as u32)) }),
             Value::Long(ref v) =>
-                Some(UIntIter { iter: Box::new(v.iter().map(|&x| x)) }),
+                Some(UIntIter { iter: Box::new(v.iter().copied()) }),
             _ => None,
         }
     }
@@ -213,7 +213,7 @@ impl UIntValue {
         match self.0 {
             Value::Byte(ref v) => v.get(index).map(|&x| x.into()),
             Value::Short(ref v) => v.get(index).map(|&x| x.into()),
-            Value::Long(ref v) => v.get(index).map(|&x| x),
+            Value::Long(ref v) => v.get(index).copied(),
             _ => panic!(),
         }
     }
@@ -224,7 +224,7 @@ pub struct UIntIter<'a> {
     iter: Box<dyn ExactSizeIterator<Item=u32> + 'a>
 }
 
-impl<'a> Iterator for UIntIter<'a> {
+impl Iterator for UIntIter<'_> {
     type Item = u32;
 
     #[inline]
@@ -238,7 +238,7 @@ impl<'a> Iterator for UIntIter<'a> {
     }
 }
 
-impl<'a> ExactSizeIterator for UIntIter<'a> {}
+impl ExactSizeIterator for UIntIter<'_> {}
 
 /// Helper struct for printing a value in a tag-specific format.
 #[derive(Copy, Clone)]
@@ -247,7 +247,7 @@ pub struct Display<'a> {
     pub value: &'a Value,
 }
 
-impl<'a> fmt::Display for Display<'a> {
+impl fmt::Display for Display<'_> {
     #[inline]
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         (self.fmt)(f, self.value)
@@ -292,7 +292,7 @@ where F: Fn() -> T, T: Iterator<Item = I>, I: fmt::Debug {
 
 struct AsciiDebugAdapter<'a>(&'a [u8]);
 
-impl<'a> fmt::Debug for AsciiDebugAdapter<'a> {
+impl fmt::Debug for AsciiDebugAdapter<'_> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.write_char('"')?;
         self.0.iter().try_for_each(|&c| match c {
@@ -306,7 +306,7 @@ impl<'a> fmt::Debug for AsciiDebugAdapter<'a> {
 
 struct HexDebugAdapter<'a>(&'a [u8]);
 
-impl<'a> fmt::Debug for HexDebugAdapter<'a> {
+impl fmt::Debug for HexDebugAdapter<'_> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.write_str("0x")?;
         self.0.iter().try_for_each(|x| write!(f, "{:02x}", x))
@@ -471,9 +471,9 @@ fn parse_byte(data: &[u8], offset: usize, count: usize) -> Value {
 fn parse_ascii(data: &[u8], offset: usize, count: usize) -> Value {
     // Any ASCII field can contain multiple strings [TIFF6 Image File
     // Directory].
-    let iter = (&data[offset .. offset + count]).split(|&b| b == b'\0');
+    let iter = (data[offset .. offset + count]).split(|&b| b == b'\0');
     let mut v: Vec<Vec<u8>> = iter.map(|x| x.to_vec()).collect();
-    if v.last().map_or(false, |x| x.len() == 0) {
+    if v.last().map_or(false, |x| x.is_empty()) {
         v.pop();
     }
     Value::Ascii(v)