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// Copyright 2014 The lldb 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 lldb
import (
"bytes"
"math/rand"
"testing"
)
// Test automatic page releasing (hole punching) of zero pages
func TestMemFilerWriteAt(t *testing.T) {
f := NewMemFiler()
// Add page index 0
if _, err := f.WriteAt([]byte{1}, 0); err != nil {
t.Fatal(err)
}
if g, e := len(f.m), 1; g != e {
t.Fatal(g, e)
}
// Add page index 1
if _, err := f.WriteAt([]byte{2}, pgSize); err != nil {
t.Fatal(err)
}
if g, e := len(f.m), 2; g != e {
t.Fatal(g, e)
}
// Add page index 2
if _, err := f.WriteAt([]byte{3}, 2*pgSize); err != nil {
t.Fatal(err)
}
if g, e := len(f.m), 3; g != e {
t.Fatal(g, e)
}
// Remove page index 1
if _, err := f.WriteAt(make([]byte, 2*pgSize), pgSize/2); err != nil {
t.Fatal(err)
}
if g, e := len(f.m), 2; g != e {
t.Logf("%#v", f.m)
t.Fatal(g, e)
}
if err := f.Truncate(1); err != nil {
t.Fatal(err)
}
if g, e := len(f.m), 1; g != e {
t.Logf("%#v", f.m)
t.Fatal(g, e)
}
if err := f.Truncate(0); err != nil {
t.Fatal(err)
}
if g, e := len(f.m), 0; g != e {
t.Logf("%#v", f.m)
t.Fatal(g, e)
}
}
func TestMemFilerWriteTo(t *testing.T) {
const max = 1e5
var b [max]byte
rng := rand.New(rand.NewSource(42))
for sz := 0; sz < 1e5; sz += 2053 {
for i := range b[:sz] {
b[i] = byte(rng.Int())
}
f := NewMemFiler()
if n, err := f.WriteAt(b[:sz], 0); n != sz || err != nil {
t.Fatal(n, err)
}
var buf bytes.Buffer
if n, err := f.WriteTo(&buf); n != int64(sz) || err != nil {
t.Fatal(n, err)
}
if !bytes.Equal(b[:sz], buf.Bytes()) {
t.Fatal("content differs")
}
}
}
func TestMemFilerReadFromWriteTo(t *testing.T) {
const (
sz = 1e2 * pgSize
hole = 1e1 * pgSize
)
rng := rand.New(rand.NewSource(42))
data := make([]byte, sz)
for i := range data {
data[i] = byte(rng.Int())
}
f := NewMemFiler()
buf := bytes.NewBuffer(data)
if n, err := f.ReadFrom(buf); n != int64(len(data)) || err != nil {
t.Fatal(n, err)
}
buf = bytes.NewBuffer(nil)
if n, err := f.WriteTo(buf); n != int64(len(data)) || err != nil {
t.Fatal(n, err)
}
rd := buf.Bytes()
if !bytes.Equal(data, rd) {
t.Fatal("corrupted data")
}
n0 := len(f.m)
data = make([]byte, hole)
f.WriteAt(data, sz/2)
n := len(f.m)
t.Log(n0, n)
d := n0 - n
if d*pgSize < hole-2 || d*pgSize > hole {
t.Fatal(n0, n, d)
}
}
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