enum Values now derives PartialEq.

Cargo.toml

@@ -16,3 +16,4 @@ license = "BSD-2-Clause"
 
 [dependencies]
 mutate_once = "0.1.1"
+serde = { version = "~1", features = ["derive"] }

src/tag.rs

@@ -26,6 +26,9 @@
 
 use std::fmt;
 
+use serde::Deserialize;
+use serde::Serialize;
+
 use crate::error::Error;
 use crate::value;
 use crate::value::Value;
@@ -55,7 +58,7 @@ use crate::util::atou16;
 // PartialEq and Eq need to be _automatically derived_ for Tag to
 // emulate structural equivalency.
 // <https://github.com/rust-lang/rfcs/pull/1445>
-#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Debug, Copy, Clone, Deserialize, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize)]
 pub struct Tag(pub Context, pub u16);
 
 impl Tag {
@@ -113,7 +116,7 @@ impl fmt::Display for Tag {
 }
 
 /// An enum that indicates how a tag number is interpreted.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Debug, Copy, Clone, Deserialize,  PartialEq, Eq, PartialOrd, Ord, Hash, Serialize)]
 #[non_exhaustive]
 pub enum Context {
     /// TIFF attributes defined in the TIFF Rev. 6.0 specification.

src/tiff.rs

@@ -26,6 +26,8 @@
 
 use std::fmt;
 use mutate_once::MutOnce;
+use serde::Deserialize;
+use serde::Serialize;
 
 use crate::endian::{Endian, BigEndian, LittleEndian};
 use crate::error::Error;
@@ -99,7 +101,7 @@ impl IfdEntry {
 }
 
 /// A TIFF/Exif field.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Deserialize, PartialEq, Serialize)]
 pub struct Field {
     /// The tag of this field.
     pub tag: Tag,
@@ -121,7 +123,7 @@ pub struct Field {
 /// assert_eq!(In::PRIMARY.index(), 0);
 /// assert_eq!(In::THUMBNAIL.index(), 1);
 /// ```
-#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Debug, Copy, Clone, Deserialize, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize)]
 pub struct In(pub u16);
 
 impl In {

src/value.rs

@@ -27,11 +27,14 @@
 use std::fmt;
 use std::fmt::Write as _;
 
+use serde::Deserialize;
+use serde::Serialize;
+
 use crate::endian::Endian;
 use crate::error::Error;
 
 /// A type and values of a TIFF/Exif field.
-#[derive(Clone)]
+#[derive(Clone, Deserialize, PartialEq, Serialize)]
 pub enum Value {
     /// Vector of 8-bit unsigned integers.
     Byte(Vec<u8>),
@@ -346,7 +349,7 @@ impl From<&DefaultValue> for Option<Value> {
 }
 
 /// An unsigned rational number, which is a pair of 32-bit unsigned integers.
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Deserialize, PartialEq, Serialize)]
 pub struct Rational { pub num: u32, pub denom: u32 }
 
 impl Rational {
@@ -384,7 +387,7 @@ impl fmt::Display for Rational {
 }
 
 /// A signed rational number, which is a pair of 32-bit signed integers.
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Deserialize, PartialEq, Serialize)]
 pub struct SRational { pub num: i32, pub denom: i32 }
 
 impl SRational {