alchemy/examples/convert_vector2.rs

extern crate alchemy;
extern crate sigils;



use alchemy::U64_BYTES;
use alchemy::{Endianess, Transmutable};
use sigils::vector::Vector2;



/// The size of 2 u64 whole numbers.
/// This would be different if the contained type
/// was something different, like an i16 or f32.
const SIZE_OF_VECTOR_2: usize = U64_BYTES * 2; 



/// This just help pretty up the printing of an array of bytes.
fn stringify_array(buffer: &[u8]) -> String
{
   let mut result: String;
   let mut count: usize;

   // Create a new string that starts with just
   // the array opening bracket.
   result = String::new();
   result.push_str("[");

   // Loop through the buffer keeping track
   // of our place in it.
   count = 0usize;
   for byte in buffer
   {
      // Handle priting the last value differently.
      if count >= buffer.len() - 1
      {
         result.push_str(byte.to_string().as_str());
      }
      else
      {
         result.push_str(byte.to_string().as_str());
         result.push_str(", ");
      }

      // Mark that we are going to look at
      // the next byte in the array.
      count += 1;
   }

   // Add the array closing bracket and
   // return the new String.
   result.push_str("]");
   result
}


pub fn main()
{
   let vec: Vector2<u64>;
   let final_vec: Vector2<u64>;
   let endianess: Endianess;
   let mut buffer: Vec<u8>;

   // Initialize the variables.
   vec = Vector2::<u64>::new(629u64, 1985u64);
   buffer = Vec::with_capacity(SIZE_OF_VECTOR_2);
   endianess = Endianess::PLATFORM;

   println!("Transmuting a Vector2:");

   println!("Converting the value {} into and out of an array of bytes.",
            vec);
   println!("Buffer starts as: {}", stringify_array(buffer.as_slice()));

   // Convert the Vector2 into an array of bytes.
   buffer = vec.to_bytes(endianess);

   println!("Buffer contains: {}", stringify_array(buffer.as_slice()));

   // Convert the array of bytes into a Vector2.
   final_vec = Vector2::from_bytes(buffer.as_slice(), endianess);
   println!("The buffer converts back to: {}", final_vec);
}