alchemy/examples/convert_u16.rs

use weave::Error;

use spellbook::components::Array;

use alchemy::{Converter, Endianess, PlatformEndian, Transmutable};
use alchemy::platform_to_network_order;



fn use_converter()
{
   let num: u16;
   let mut buffer: Array<u8>;

   // Initialize the variables.
   num = 32832u16;
   buffer = Array::new();

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

   // Convert the short point number into an array of bytes.
   buffer = PlatformEndian::u16_to_bytes(num);

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

   // Convert the array of bytes into a short number.
   match PlatformEndian::bytes_to_u16(buffer.as_slice())
   {
      Ok(final_num) =>
      {
         println!("The buffer converts back to: {}", final_num);
      }

      Err(error) =>
      {
         println!("{}\n{}", error, error.get_description());
      }
   }
}

pub fn use_transmutable()
{
   let num: u16;
   let endianess: Endianess;
   let mut buffer: Array<u8>;

   // Initialize the variables.
   num = 32832u16;
   buffer = Array::new();
   endianess = Endianess::Platform;

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

   // Convert the short point number into an array of bytes.
   buffer = num.as_endian_bytes(endianess);

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

   // Convert the array of bytes into a short number.
   match u16::from_endian_bytes(buffer.as_slice(), endianess)
   {
      Ok(final_num) =>
      {
         println!("The buffer converts back to: {}", final_num);
      }

      Err(error) =>
      {
         println!("{}\n{}", error, error.get_description());
      }
   }

}

/// 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()
{
   println!("Using converter:");
   use_converter();

   println!("");

   println!("Using transmutable:");
   use_transmutable();

   println!("");

   match platform_to_network_order(32832u16)
   {
      Ok(val) => { println!("This turns into a network value of:  {}", val); }
      Err(error) => { println!("{}\n{}", error, error.get_description()); }
   }
}