Fix build scripts not build

proc_macros/proc_macros.rs

@@ -0,0 +1,45 @@
+extern crate quote;
+extern crate syn;
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::Ident;
+use syn::parse_macro_input;
+
+#[proc_macro]
+pub fn define_struct_reader_fn(item: TokenStream) -> TokenStream {
+    let i = parse_macro_input!(item as Ident);
+    let lefname = format!("read_le_{}", i);
+    let lefname = Ident::new(&lefname, i.span());
+    let befname = format!("read_be_{}", i);
+    let befname = Ident::new(&befname, i.span());
+    let stream = quote! {
+        #[doc = concat!("Read [", stringify!(#i), "] in little endian.")]
+        fn #lefname(&mut self) -> Result<#i, Self::Error>;
+        #[doc = concat!("Read [", stringify!(#i), "] in big endian.")]
+        fn #befname(&mut self) -> Result<#i, Self::Error>;
+    };
+    stream.into()
+}
+
+#[proc_macro]
+pub fn impl_struct_reader_read(item: TokenStream) -> TokenStream {
+    let i = parse_macro_input!(item as Ident);
+    let lefname = format!("read_le_{}", i);
+    let lefname = Ident::new(&lefname, i.span());
+    let befname = format!("read_be_{}", i);
+    let befname = Ident::new(&befname, i.span());
+    let stream = quote! {
+        fn #lefname(&mut self) -> Result<#i, Self::Error> {
+            let mut buf = [0u8; std::mem::size_of::<#i>()];
+            self.read_exact(&mut buf)?;
+            Ok(<#i>::from_le_bytes(buf))
+        }
+        fn #befname(&mut self) -> Result<#i, Self::Error> {
+            let mut buf = [0u8; std::mem::size_of::<#i>()];
+            self.read_exact(&mut buf)?;
+            Ok(<#i>::from_be_bytes(buf))
+        }
+    };
+    stream.into()
+}