Remove deprecated ioutil usage (#291)

Author: ernado

README.md

@@ -228,7 +228,7 @@ You might have a large slice of data.
 To help you split this, there are some helper functions that can split and join a single byte slice.
 
 ```Go
-   bigfile, _ := ioutil.Readfile("myfile.data")
+   bigfile, _ := os.Readfile("myfile.data")
 
    // Split the file
    split, err := enc.Split(bigfile)

_gen/cleanup.go

@@ -8,7 +8,6 @@ package main
 import (
 	"bytes"
 	"flag"
-	"io/ioutil"
 	"log"
 	"os"
 
@@ -19,7 +18,7 @@ func main() {
 	flag.Parse()
 	args := flag.Args()
 	for _, file := range args {
-		data, err := ioutil.ReadFile(file)
+		data, err := os.ReadFile(file)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -40,7 +39,7 @@ func main() {
 		if err != nil {
 			log.Fatalln(err)
 		}
-		err = ioutil.WriteFile(file, data, os.ModePerm)
+		err = os.WriteFile(file, data, os.ModePerm)
 		if err != nil {
 			log.Fatalln(err)
 		}

examples/simple-encoder.go

@@ -39,7 +39,6 @@ package main
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -79,7 +78,7 @@ func main() {
 	checkErr(err)
 
 	fmt.Println("Opening", fname)
-	b, err := ioutil.ReadFile(fname)
+	b, err := os.ReadFile(fname)
 	checkErr(err)
 
 	// Split the file into equally sized shards.
@@ -100,7 +99,7 @@ func main() {
 		outfn := fmt.Sprintf("%s.%d", file, i)
 
 		fmt.Println("Writing to", outfn)
-		err = ioutil.WriteFile(filepath.Join(dir, outfn), shard, 0644)
+		err = os.WriteFile(filepath.Join(dir, outfn), shard, 0644)
 		checkErr(err)
 	}
 }

examples_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"math/rand"
 
@@ -252,7 +251,7 @@ func ExampleStreamEncoder() {
 	// Create our output io.Writers
 	out := make([]io.Writer, parityShards)
 	for i := range out {
-		out[i] = ioutil.Discard
+		out[i] = io.Discard
 	}
 
 	// Encode from input to output.

streaming_test.go

@@ -9,7 +9,6 @@ package reedsolomon
 import (
 	"bytes"
 	"io"
-	"io/ioutil"
 	"math/rand"
 	"testing"
 )
@@ -504,7 +503,7 @@ func benchmarkStreamEncode(b *testing.B, dataShards, parityShards, shardSize int
 	b.ResetTimer()
 	out := make([]io.Writer, parityShards)
 	for i := range out {
-		out[i] = ioutil.Discard
+		out[i] = io.Discard
 	}
 	for i := 0; i < b.N; i++ {
 		err = r.Encode(toReaders(toBuffers(shards)), out)