// 2018-JUL-21 --- J.BENDOR --- 858-382-7570

#![feature(nll)]

#![allow(dead_code)]
#![allow(unused_parens)]
#![allow(non_snake_case)]
#![allow(non_upper_case_globals)]

use std::str;
use std::io::Read;
use std::fs::OpenOptions;


//**********************************************************************
// reads a block of bytes into array --- returns zero on failure or EOF
//**********************************************************************
pub fn Read_Some_Bytes ( aFilePath  : &str,
                         readLength : usize,
                         byteVector  : &mut Vec<u8> ) -> usize
{
    let mut open_options = OpenOptions::new();

    open_options.read(true);

    let maybe_file = open_options.open(aFilePath);

    if maybe_file.is_err()
    {
        return 0;
    }

    let mut src_file = maybe_file.unwrap();

    byteVector.resize( readLength, 0 );

    let bytes_slice = &mut byteVector [ 0 .. readLength ];

    let num_bytes = src_file.read( bytes_slice ).unwrap_or(0);

    return num_bytes;
}


fn main()
{
 let mut read_txt = "COMPILE.FAILED";

    let mut bytes_vec : Vec<u8> = Vec::new();

//    let mut read_txt = "READING.FAILED";

    Read_Some_Bytes(r"E:\L14433.Molec.txt", 10, &mut bytes_vec);

    let maybe_txt = str::from_utf8( &bytes_vec );

    if maybe_txt.is_ok()
    {
        read_txt = maybe_txt.unwrap();
    }

    println!( "Read: ({})", read_txt.trim() );

    println!( "ByeBye!" );
}