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// Copyright (c) 2014 The fileutil authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build amd64 amd64p32 arm64 arm64be ppc64 ppc64le mips64 mips64le mips64p32 mips64p32le sparc64
package fileutil
import (
"io/ioutil"
"os"
"testing"
)
func TestPunch(t *testing.T) {
file, err := ioutil.TempFile("", "punchhole-")
if err != nil {
t.Error(err)
}
defer os.Remove(file.Name())
defer file.Close()
buf := make([]byte, 10<<20)
for i := range buf {
buf[i] = byte(1 + (i+1)&0xfe)
}
if _, err = file.Write(buf); err != nil {
t.Errorf("error writing to the temp file: %v", err)
t.FailNow()
}
if err = file.Sync(); err != nil {
t.Logf("error syncing %q: %v", file.Name(), err)
}
for i, j := range []int{1, 31, 1 << 10} {
if err = PunchHole(file, int64(j), int64(j)); err != nil {
t.Errorf("%d. error punching at %d, size %d: %v", i, j, j, err)
continue
}
// read back, with 1-1 bytes overlaid
n, err := file.ReadAt(buf[:j+2], int64(j-1))
if err != nil {
t.Errorf("%d. error reading file: %v", i, err)
continue
}
buf = buf[:n]
if buf[0] == 0 {
t.Errorf("%d. file at %d has been overwritten with 0!", i, j-1)
}
if buf[n-1] == 0 {
t.Errorf("%d. file at %d has been overwritten with 0!", i, j-1+n)
}
if !hasPunchHole {
continue
}
for k, v := range buf[1 : n-1] {
if v != 0 {
t.Errorf("%d. error reading file at %d got %d, want 0.", i, k, v)
}
}
}
}
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