#![feature(zero_one)]
#![feature(num_bits_bytes)]

extern crate rand;

extern crate alchemy;
extern crate sigils;



use rand::thread_rng;



/// This should only be called by the macro below.
macro_rules! overflow_impl
{
   ($numBytes: expr, $T: ident,
    $read_func: ident, $write_func: ident) =>
   {
      use std::num::Zero;

      use alchemy::{BigEndian, LittleEndian, Transmutable};



      #[test]
      #[should_panic]
      fn read_big_endian()
      {
         let buffer: [u8; $numBytes];

         buffer = [0u8; $numBytes];
         BigEndian::$read_func(&buffer);
      }

      #[test]
      #[should_panic]
      fn read_little_endian()
      {
         let buffer: [u8; $numBytes];

         buffer = [0u8; $numBytes];
         LittleEndian::$read_func(&buffer);
      }


      #[test]
      #[should_panic]
      fn write_big_endian()
      {
         let mut buffer: [u8; $numBytes];

         buffer = [0u8; $numBytes];
         BigEndian::$write_func(&mut buffer, $T::zero());
      }

      #[test]
      #[should_panic]
      fn write_little_endian()
      {
         let mut buffer: [u8; $numBytes];

         buffer = [0u8; $numBytes];
         LittleEndian::$write_func(&mut buffer, $T::zero());
      }
   };
}

/// This macro tries to test for buffer overflow happening.
macro_rules! test_buffer_overflow
{
   ($mod_name: ident, $T: ident,
    $read_func: ident, $write_func: ident) =>
   {
      mod $mod_name
      {
         use std::$T;
         overflow_impl!($T::BYTES, $T, $read_func, $write_func);
      }
   };

   ($mod_name: ident, $T: ident,
    $read_func: ident, $write_func: ident, $numBytes: expr) =>
   {
      mod $mod_name
      {
         overflow_impl!($numBytes, $T, $read_func, $write_func);
      }
   };
}



// Test the different data types for buffer overflow.
test_buffer_overflow!(overflow_u16, u16, bytes_to_u16, u16_to_bytes);
test_buffer_overflow!(overflow_u32, u32, bytes_to_u32, u32_to_bytes);
test_buffer_overflow!(overflow_u64, u64, bytes_to_u64, u64_to_bytes);
test_buffer_overflow!(overflow_usize, usize,
                      bytes_to_usize, usize_to_bytes, 9);

test_buffer_overflow!(overflow_i16, i16, bytes_to_i16, i16_to_bytes);
test_buffer_overflow!(overflow_i32, i32, bytes_to_i32, i32_to_bytes);
test_buffer_overflow!(overflow_i64, i64, bytes_to_i64, i64_to_bytes);
test_buffer_overflow!(overflow_isize, isize,
                      bytes_to_isize, isize_to_bytes, 9);

test_buffer_overflow!(overflow_f32, f32, bytes_to_f32, f32_to_bytes, 4);
test_buffer_overflow!(overflow_f64, f64, bytes_to_f64, f64_to_bytes, 8);