encode_ascii.go

package main

import (
	"fmt"
	"strings"
	"os"
	"bufio"
	"io"
	"strconv"
	"encoding/binary"
	"bytes"
)

func main() {
	if len(os.Args) < 3 {
		fmt.Printf("Usage: %s <infilename> <outfilename>", os.Args[0])
	}
	infile, err := os.Open(os.Args[1])
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	defer infile.Close()

	outfile, err := os.OpenFile(os.Args[2], os.O_RDWR | os.O_CREATE, 0644)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	defer outfile.Close()

	var num_list []float64
	var row uint64 = 0
	var num_elem uint64 = 0
	r := bufio.NewReader(infile)
	for {
		s, e := r.ReadString('\n')
		if e != nil {
			if e != io.EOF {
				fmt.Println(e)
			}
			break
		}
		row += 1
		slist := strings.Split(s[:len(s)-1], " ")
		for _, element := range slist {
			num, _ := strconv.ParseFloat(element, 64)
			num_list = append(num_list, num)
			num_elem += 1
		}
	}
	var buf bytes.Buffer
	binary.Write(&buf, binary.LittleEndian, row)
	binary.Write(&buf, binary.LittleEndian, num_elem/row)

	for _, element := range num_list {
		binary.Write(&buf, binary.LittleEndian, element)
	}
	outfile.Write(buf.Bytes())
}