argdata 0.1.2

Argdata: A binary serialization format.
Documentation 
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use fd;
use std::io;
use Argdata;
use IntValue;
use ReadError;
use Value;

/// A big-endian 2's-complement signed arbitrary length integer.
#[derive(Clone, Copy, Debug)]
pub struct BigInt<'d> {
	value: &'d [u8],
}

/// Create an argdata value representing an arbitrary length 2's complement integer.
pub fn bigint<'d>(value: &'d [u8]) -> BigInt<'d> {
	BigInt { value }
}

impl<'d> BigInt<'d> {
	pub fn bytes(&self) -> &'d [u8] {
		self.value
	}
	pub fn int_value(&self) -> IntValue<'d> {
		IntValue::from_bigint(self.bytes())
	}
}

impl<'d> Argdata<'d> for BigInt<'d> {
	fn read<'a>(&'a self) -> Result<Value<'a, 'd>, ReadError>
	where
		'd: 'a,
	{
		Ok(Value::Int(IntValue::from_bigint(self.bytes())))
	}

	fn serialized_length(&self) -> usize {
		self.bytes().len() + 1
	}

	fn serialize(&self, writer: &mut io::Write, _: Option<&mut fd::FdMapping>) -> io::Result<()> {
		writer.write_all(&[5])?;
		writer.write_all(self.bytes())?;
		Ok(())
	}
}