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use std::fs::File;
use std::{env};
use std::path::Path;
use std::io::{Write, BufReader, BufRead, Error,Read};
const  CHUNKSIZE:usize= 8192;
/*判断是文本文件还是二进制文件  ，true 文本文件 false 二进制文件*/
pub fn is_binary_file(file_path :&str) -> Option<bool> {

    let mut read_size =CHUNKSIZE;
    let path = Path::new(&file_path);
    let file_size =path.metadata().unwrap().len() as usize;
    if read_size > file_size {
        read_size =file_size;
    }
    
    let mut buffer=[0;CHUNKSIZE];
    let mut _inputfile = File::open(&file_path).unwrap();
    _inputfile.read(&mut buffer).unwrap();
    
    //println!("buffer={:?}",buffer);
 
    let mut i=0;
    while(i<read_size){
        if (buffer[i]  ==0) {
           return  Some(true);
        }

        i=i+1;
    }


    Some(false)

}