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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package buildid
import (
"bytes"
"crypto/sha256"
"io/ioutil"
"os"
"reflect"
"testing"
)
const (
expectedID = "abcdefghijklmnopqrstuvwxyz.1234567890123456789012345678901234567890123456789012345678901234"
newID = "bcdefghijklmnopqrstuvwxyza.2345678901234567890123456789012345678901234567890123456789012341"
)
func TestReadFile(t *testing.T) {
var files = []string{
"p.a",
"a.elf",
"a.macho",
"a.pe",
}
f, err := ioutil.TempFile("", "buildid-test-")
if err != nil {
t.Fatal(err)
}
tmp := f.Name()
defer os.Remove(tmp)
f.Close()
for _, f := range files {
id, err := ReadFile("testdata/" + f)
if id != expectedID || err != nil {
t.Errorf("ReadFile(testdata/%s) = %q, %v, want %q, nil", f, id, err, expectedID)
}
old := readSize
readSize = 2048
id, err = ReadFile("testdata/" + f)
readSize = old
if id != expectedID || err != nil {
t.Errorf("ReadFile(testdata/%s) [readSize=2k] = %q, %v, want %q, nil", f, id, err, expectedID)
}
data, err := ioutil.ReadFile("testdata/" + f)
if err != nil {
t.Fatal(err)
}
m, _, err := FindAndHash(bytes.NewReader(data), expectedID, 1024)
if err != nil {
t.Errorf("FindAndHash(testdata/%s): %v", f, err)
continue
}
if err := ioutil.WriteFile(tmp, data, 0666); err != nil {
t.Error(err)
continue
}
tf, err := os.OpenFile(tmp, os.O_WRONLY, 0)
if err != nil {
t.Error(err)
continue
}
err = Rewrite(tf, m, newID)
err2 := tf.Close()
if err != nil {
t.Errorf("Rewrite(testdata/%s): %v", f, err)
continue
}
if err2 != nil {
t.Fatal(err2)
}
id, err = ReadFile(tmp)
if id != newID || err != nil {
t.Errorf("ReadFile(testdata/%s after Rewrite) = %q, %v, want %q, nil", f, id, err, newID)
}
}
}
func TestFindAndHash(t *testing.T) {
buf := make([]byte, 64)
buf2 := make([]byte, 64)
id := make([]byte, 8)
zero := make([]byte, 8)
for i := range id {
id[i] = byte(i)
}
numError := 0
errorf := func(msg string, args ...interface{}) {
t.Errorf(msg, args...)
if numError++; numError > 20 {
t.Logf("stopping after too many errors")
t.FailNow()
}
}
for bufSize := len(id); bufSize <= len(buf); bufSize++ {
for j := range buf {
for k := 0; k < 2*len(id) && j+k < len(buf); k++ {
for i := range buf {
buf[i] = 1
}
copy(buf[j:], id)
copy(buf[j+k:], id)
var m []int64
if j+len(id) <= j+k {
m = append(m, int64(j))
}
if j+k+len(id) <= len(buf) {
m = append(m, int64(j+k))
}
copy(buf2, buf)
for _, p := range m {
copy(buf2[p:], zero)
}
h := sha256.Sum256(buf2)
matches, hash, err := FindAndHash(bytes.NewReader(buf), string(id), bufSize)
if err != nil {
errorf("bufSize=%d j=%d k=%d: findAndHash: %v", bufSize, j, k, err)
continue
}
if !reflect.DeepEqual(matches, m) {
errorf("bufSize=%d j=%d k=%d: findAndHash: matches=%v, want %v", bufSize, j, k, matches, m)
continue
}
if hash != h {
errorf("bufSize=%d j=%d k=%d: findAndHash: matches correct, but hash=%x, want %x", bufSize, j, k, hash, h)
}
}
}
}
}
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