add derive macro for Read

bitstream_reader_derive/tests/test.rs

@@ -0,0 +1,57 @@
+use bitstream_reader::{BitBuffer, BitStream, LittleEndian};
+use bitstream_reader_derive::Read;
+
+#[derive(Read, PartialEq, Debug)]
+struct TestStruct {
+    foo: u8,
+    str: String,
+    #[size = 2]
+    truncated: String,
+    bar: u16,
+    float: f32,
+    #[size = 3]
+    asd: u8,
+    #[size_bits = 2]
+    dynamic: u8,
+    #[size = "asd"]
+    previous_field: u8,
+}
+
+#[test]
+fn test_read_struct() {
+    let float: [u8; 4] = 12.5f32.to_bits().to_le_bytes();
+    let bytes = vec![
+        12,
+        'h' as u8,
+        'e' as u8,
+        'l' as u8,
+        'l' as u8,
+        'o' as u8,
+        0,
+        'f' as u8,
+        'o' as u8,
+        'o' as u8,
+        0,
+        float[0],
+        float[1],
+        float[2],
+        float[3],
+        0b0101_0101,
+        0b1010_1010,
+    ];
+    let buffer = BitBuffer::new(bytes, LittleEndian);
+    let mut stream = BitStream::from(buffer);
+    assert_eq!(
+        TestStruct {
+            foo: 12,
+            str: "hello".to_owned(),
+            truncated: "fo".to_owned(),
+            bar: 'o' as u16,
+            float: 12.5,
+            asd: 0b101,
+            dynamic: 0b10,
+            previous_field: 0b1010_0,
+        },
+        stream.read().unwrap()
+    );
+}