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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package bufiox
import (
"bufio"
"bytes"
"io"
"testing"
)
func TestReadFull(t *testing.T) {
data := []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}
br := bufio.NewReader(bytes.NewReader(data))
var buf [5]byte
n, err := ReadFull(br, buf[:])
if err != nil {
t.Fatalf("ReadFull: %v", err)
}
if n != len(buf) {
t.Fatalf("n = %d, want %d", n, len(buf))
}
if want := [5]byte{0x01, 0x02, 0x03, 0x04, 0x05}; buf != want {
t.Fatalf("buf = %v, want %v", buf, want)
}
// Remaining bytes should still be readable.
var rest [3]byte
n, err = ReadFull(br, rest[:])
if err != nil {
t.Fatalf("ReadFull rest: %v", err)
}
if n != len(rest) {
t.Fatalf("rest n = %d, want %d", n, len(rest))
}
if want := [3]byte{0x06, 0x07, 0x08}; rest != want {
t.Fatalf("rest = %v, want %v", rest, want)
}
}
func TestReadFullShort(t *testing.T) {
data := []byte{0x01, 0x02}
br := bufio.NewReader(bytes.NewReader(data))
var buf [5]byte
_, err := ReadFull(br, buf[:])
if err != io.ErrUnexpectedEOF {
t.Fatalf("err = %v, want %v", err, io.ErrUnexpectedEOF)
}
}
func TestReadFullEmpty(t *testing.T) {
br := bufio.NewReader(bytes.NewReader(nil))
var buf [1]byte
_, err := ReadFull(br, buf[:])
if err != io.EOF {
t.Fatalf("err = %v, want %v", err, io.EOF)
}
}
func TestReadFullZeroAllocs(t *testing.T) {
data := make([]byte, 64)
rd := bytes.NewReader(data)
br := bufio.NewReader(rd)
var buf [32]byte
got := testing.AllocsPerRun(1000, func() {
rd.Reset(data)
br.Reset(rd)
_, err := ReadFull(br, buf[:])
if err != nil {
t.Fatalf("ReadFull: %v", err)
}
})
if got != 0 {
t.Fatalf("ReadFull allocs = %f, want 0", got)
}
}
type nopReader struct{}
func (nopReader) Read(p []byte) (int, error) { return len(p), nil }
func BenchmarkReadFull(b *testing.B) {
br := bufio.NewReader(nopReader{})
var buf [32]byte
b.ReportAllocs()
b.ResetTimer()
for range b.N {
_, err := ReadFull(br, buf[:])
if err != nil {
b.Fatal(err)
}
}
}
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