//! Conversion operations
use super::*;
use std::io::{
    self, Write, Read,
};
use error::Error;

/// Convert from a reader to a writer
/// # Returns
/// The number of bytes read from the `input` stream, and the number of bytes written to the `output` stream.
pub fn conv_reader_writer<R: Read, W: Write>(input: R, input_format: FormatKind, output: W, output_format: FormatKind) -> Result<(usize, usize), Error>
{
    let cfg = formats::config::Config::default();
    
    let input_format = input_format.directive();
    let output_format = output_format.directive();

    let (obj, read) = input_format.call_decode(&cfg, input)?;
    let write = output_format.call_encode(&cfg, output, &obj)?;

    Ok((read, write))
}