Replace all usages of deprecated ioutil package.

Author: icedream

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 * Fix writer failure not being returned from `Patch` methods.
+* Remove all usages of the now deprecated `io/ioutil` package.
 
 ## [1.0.2] - 2025-02-27
 ### Changed

diff/diff.go

@@ -6,19 +6,18 @@ package diff
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/dsnet/compress/bzip2"
 	"github.com/icedream/go-bsdiff/internal"
 	"github.com/icedream/go-bsdiff/internal/native"
 )
 
 func Diff(oldReader, newReader io.Reader, patchWriter io.Writer) (err error) {
-	oldBytes, err := ioutil.ReadAll(oldReader)
+	oldBytes, err := io.ReadAll(oldReader)
 	if err != nil {
 		return
 	}
-	newBytes, err := ioutil.ReadAll(newReader)
+	newBytes, err := io.ReadAll(newReader)
 	if err != nil {
 		return
 	}

patch/patch.go

@@ -7,14 +7,13 @@ package patch
 import (
 	"compress/bzip2"
 	"io"
-	"io/ioutil"
 
 	"github.com/icedream/go-bsdiff/internal"
 	"github.com/icedream/go-bsdiff/internal/native"
 )
 
 func Patch(oldReader io.Reader, newWriter io.Writer, patchReader io.Reader) (err error) {
-	oldBytes, err := ioutil.ReadAll(oldReader)
+	oldBytes, err := io.ReadAll(oldReader)
 	if err != nil {
 		return
 	}

raw/diff/diff.go

@@ -6,7 +6,6 @@ package diff
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/icedream/go-bsdiff/internal/native"
 )
@@ -20,11 +19,11 @@ It may be helpful to save away the new content size along with the actual
 patch as it will be needed in order to reuse the patch.
 */
 func Diff(oldReader, newReader io.Reader, patchWriter io.Writer) (err error) {
-	oldBytes, err := ioutil.ReadAll(oldReader)
+	oldBytes, err := io.ReadAll(oldReader)
 	if err != nil {
 		return
 	}
-	newBytes, err := ioutil.ReadAll(newReader)
+	newBytes, err := io.ReadAll(newReader)
 	if err != nil {
 		return
 	}

raw/patch/patch.go

@@ -6,7 +6,6 @@ package patch
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/icedream/go-bsdiff/internal/native"
 )
@@ -20,7 +19,7 @@ newSize needs to be exactly the size of the new file that should be generated
 from the patch.
 */
 func Patch(oldReader io.Reader, newWriter io.Writer, patchReader io.Reader, newSize uint64) (err error) {
-	oldBytes, err := ioutil.ReadAll(oldReader)
+	oldBytes, err := io.ReadAll(oldReader)
 	if err != nil {
 		return
 	}