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// Copyright 2015 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package source
import (
"bytes"
"io"
"io/ioutil"
"os"
"testing"
)
func TestNewLazyFileReader(t *testing.T) {
filename := "itdoesnotexistfile"
_, err := NewLazyFileReader(filename)
if err == nil {
t.Errorf("NewLazyFileReader %s: error expected but no error is returned", filename)
}
filename = "lazy_file_reader_test.go"
_, err = NewLazyFileReader(filename)
if err != nil {
t.Errorf("NewLazyFileReader %s: %v", filename, err)
}
}
func TestFilename(t *testing.T) {
filename := "lazy_file_reader_test.go"
rd, err := NewLazyFileReader(filename)
if err != nil {
t.Fatalf("NewLazyFileReader %s: %v", filename, err)
}
if rd.Filename() != filename {
t.Errorf("Filename: expected filename %q, got %q", filename, rd.Filename())
}
}
func TestRead(t *testing.T) {
filename := "lazy_file_reader_test.go"
fi, err := os.Stat(filename)
if err != nil {
t.Fatalf("os.Stat: %v", err)
}
b, err := ioutil.ReadFile(filename)
if err != nil {
t.Fatalf("ioutil.ReadFile: %v", err)
}
rd, err := NewLazyFileReader(filename)
if err != nil {
t.Fatalf("NewLazyFileReader %s: %v", filename, err)
}
tst := func(testcase string) {
p := make([]byte, fi.Size())
n, err := rd.Read(p)
if err != nil {
t.Fatalf("Read %s case: %v", testcase, err)
}
if int64(n) != fi.Size() {
t.Errorf("Read %s case: read bytes length expected %d, got %d", testcase, fi.Size(), n)
}
if !bytes.Equal(b, p) {
t.Errorf("Read %s case: read bytes are different from expected", testcase)
}
}
tst("No cache")
_, err = rd.Seek(0, 0)
if err != nil {
t.Fatalf("Seek: %v", err)
}
tst("Cache")
}
func TestSeek(t *testing.T) {
type testcase struct {
seek int
offset int64
length int
moveto int64
expected []byte
}
filename := "lazy_file_reader_test.go"
b, err := ioutil.ReadFile(filename)
if err != nil {
t.Fatalf("ioutil.ReadFile: %v", err)
}
// no cache case
for i, this := range []testcase{
{seek: os.SEEK_SET, offset: 0, length: 10, moveto: 0, expected: b[:10]},
{seek: os.SEEK_SET, offset: 5, length: 10, moveto: 5, expected: b[5:15]},
{seek: os.SEEK_CUR, offset: 5, length: 10, moveto: 5, expected: b[5:15]}, // current pos = 0
{seek: os.SEEK_END, offset: -1, length: 1, moveto: int64(len(b) - 1), expected: b[len(b)-1:]},
{seek: 3, expected: nil},
{seek: os.SEEK_SET, offset: -1, expected: nil},
} {
rd, err := NewLazyFileReader(filename)
if err != nil {
t.Errorf("[%d] NewLazyFileReader %s: %v", i, filename, err)
continue
}
pos, err := rd.Seek(this.offset, this.seek)
if this.expected == nil {
if err == nil {
t.Errorf("[%d] Seek didn't return an expected error", i)
}
} else {
if err != nil {
t.Errorf("[%d] Seek failed unexpectedly: %v", i, err)
continue
}
if pos != this.moveto {
t.Errorf("[%d] Seek failed to move the pointer: got %d, expected: %d", i, pos, this.moveto)
}
buf := make([]byte, this.length)
n, err := rd.Read(buf)
if err != nil {
t.Errorf("[%d] Read failed unexpectedly: %v", i, err)
}
if !bytes.Equal(this.expected, buf[:n]) {
t.Errorf("[%d] Seek and Read got %q but expected %q", i, buf[:n], this.expected)
}
}
}
// cache case
rd, err := NewLazyFileReader(filename)
if err != nil {
t.Fatalf("NewLazyFileReader %s: %v", filename, err)
}
dummy := make([]byte, len(b))
_, err = rd.Read(dummy)
if err != nil {
t.Fatalf("Read failed unexpectedly: %v", err)
}
for i, this := range []testcase{
{seek: os.SEEK_SET, offset: 0, length: 10, moveto: 0, expected: b[:10]},
{seek: os.SEEK_SET, offset: 5, length: 10, moveto: 5, expected: b[5:15]},
{seek: os.SEEK_CUR, offset: 1, length: 10, moveto: 16, expected: b[16:26]}, // current pos = 15
{seek: os.SEEK_END, offset: -1, length: 1, moveto: int64(len(b) - 1), expected: b[len(b)-1:]},
{seek: 3, expected: nil},
{seek: os.SEEK_SET, offset: -1, expected: nil},
} {
pos, err := rd.Seek(this.offset, this.seek)
if this.expected == nil {
if err == nil {
t.Errorf("[%d] Seek didn't return an expected error", i)
}
} else {
if err != nil {
t.Errorf("[%d] Seek failed unexpectedly: %v", i, err)
continue
}
if pos != this.moveto {
t.Errorf("[%d] Seek failed to move the pointer: got %d, expected: %d", i, pos, this.moveto)
}
buf := make([]byte, this.length)
n, err := rd.Read(buf)
if err != nil {
t.Errorf("[%d] Read failed unexpectedly: %v", i, err)
}
if !bytes.Equal(this.expected, buf[:n]) {
t.Errorf("[%d] Seek and Read got %q but expected %q", i, buf[:n], this.expected)
}
}
}
}
func TestWriteTo(t *testing.T) {
filename := "lazy_file_reader_test.go"
fi, err := os.Stat(filename)
if err != nil {
t.Fatalf("os.Stat: %v", err)
}
b, err := ioutil.ReadFile(filename)
if err != nil {
t.Fatalf("ioutil.ReadFile: %v", err)
}
rd, err := NewLazyFileReader(filename)
if err != nil {
t.Fatalf("NewLazyFileReader %s: %v", filename, err)
}
tst := func(testcase string, expectedSize int64, checkEqual bool) {
buf := bytes.NewBuffer(make([]byte, 0, bytes.MinRead))
n, err := rd.WriteTo(buf)
if err != nil {
t.Fatalf("WriteTo %s case: %v", testcase, err)
}
if n != expectedSize {
t.Errorf("WriteTo %s case: written bytes length expected %d, got %d", testcase, expectedSize, n)
}
if checkEqual && !bytes.Equal(b, buf.Bytes()) {
t.Errorf("WriteTo %s case: written bytes are different from expected", testcase)
}
}
tst("No cache", fi.Size(), true)
tst("No cache 2nd", 0, false)
p := make([]byte, fi.Size())
_, err = rd.Read(p)
if err != nil && err != io.EOF {
t.Fatalf("Read: %v", err)
}
_, err = rd.Seek(0, 0)
if err != nil {
t.Fatalf("Seek: %v", err)
}
tst("Cache", fi.Size(), true)
}
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