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// Copyright 2011 Evan Shaw. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// These tests are adapted from gommap: http://labix.org/gommap
// Copyright (c) 2010, Gustavo Niemeyer <gustavo@niemeyer.net>
package mmap
import (
"bytes"
"io/ioutil"
"os"
"path/filepath"
"testing"
)
var testData = []byte("0123456789ABCDEF")
var testPath = filepath.Join(os.TempDir(), "testdata")
func init() {
f := openFile(os.O_RDWR | os.O_CREATE | os.O_TRUNC)
f.Write(testData)
f.Close()
}
func openFile(flags int) *os.File {
f, err := os.OpenFile(testPath, flags, 0644)
if err != nil {
panic(err.Error())
}
return f
}
func TestUnmap(t *testing.T) {
f := openFile(os.O_RDONLY)
defer f.Close()
mmap, err := Map(f, RDONLY, 0)
if err != nil {
t.Errorf("error mapping: %s", err)
}
if err := mmap.Unmap(); err != nil {
t.Errorf("error unmapping: %s", err)
}
}
func TestReadWrite(t *testing.T) {
f := openFile(os.O_RDWR)
defer f.Close()
mmap, err := Map(f, RDWR, 0)
if err != nil {
t.Errorf("error mapping: %s", err)
}
defer mmap.Unmap()
if !bytes.Equal(testData, mmap) {
t.Errorf("mmap != testData: %q, %q", mmap, testData)
}
mmap[9] = 'X'
mmap.Flush()
fileData, err := ioutil.ReadAll(f)
if err != nil {
t.Errorf("error reading file: %s", err)
}
if !bytes.Equal(fileData, []byte("012345678XABCDEF")) {
t.Errorf("file wasn't modified")
}
// leave things how we found them
mmap[9] = '9'
mmap.Flush()
}
func TestProtFlagsAndErr(t *testing.T) {
f := openFile(os.O_RDONLY)
defer f.Close()
if _, err := Map(f, RDWR, 0); err == nil {
t.Errorf("expected error")
}
}
func TestFlags(t *testing.T) {
f := openFile(os.O_RDWR)
defer f.Close()
mmap, err := Map(f, COPY, 0)
if err != nil {
t.Errorf("error mapping: %s", err)
}
defer mmap.Unmap()
mmap[9] = 'X'
mmap.Flush()
fileData, err := ioutil.ReadAll(f)
if err != nil {
t.Errorf("error reading file: %s", err)
}
if !bytes.Equal(fileData, testData) {
t.Errorf("file was modified")
}
}
// Test that we can map files from non-0 offsets
// The page size on most Unixes is 4KB, but on Windows it's 64KB
func TestNonZeroOffset(t *testing.T) {
const pageSize = 65536
// Create a 2-page sized file
bigFilePath := filepath.Join(os.TempDir(), "nonzero")
fileobj, err := os.OpenFile(bigFilePath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
panic(err.Error())
}
bigData := make([]byte, 2*pageSize, 2*pageSize)
fileobj.Write(bigData)
fileobj.Close()
// Map the first page by itself
fileobj, err = os.OpenFile(bigFilePath, os.O_RDONLY, 0)
if err != nil {
panic(err.Error())
}
m, err := MapRegion(fileobj, pageSize, RDONLY, 0, 0)
if err != nil {
t.Errorf("error mapping file: %s", err)
}
m.Unmap()
fileobj.Close()
// Map the second page by itself
fileobj, err = os.OpenFile(bigFilePath, os.O_RDONLY, 0)
if err != nil {
panic(err.Error())
}
m, err = MapRegion(fileobj, pageSize, RDONLY, 0, pageSize)
if err != nil {
t.Errorf("error mapping file: %s", err)
}
err = m.Unmap()
if err != nil {
t.Error(err)
}
m, err = MapRegion(fileobj, pageSize, RDONLY, 0, 1)
if err == nil {
t.Error("expect error because offset is not multiple of page size")
}
fileobj.Close()
}
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