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// Copyright 2014 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 flate
import (
"bufio"
"bytes"
"io"
"strings"
"testing"
)
func TestReset(t *testing.T) {
ss := []string{
"lorem ipsum izzle fo rizzle",
"the quick brown fox jumped over",
}
deflated := make([]bytes.Buffer, 2)
for i, s := range ss {
w, _ := NewWriter(&deflated[i], 1)
w.Write([]byte(s))
w.Close()
}
inflated := make([]bytes.Buffer, 2)
f := NewReader(&deflated[0])
io.Copy(&inflated[0], f)
f.(Resetter).Reset(&deflated[1], nil)
io.Copy(&inflated[1], f)
f.Close()
for i, s := range ss {
if s != inflated[i].String() {
t.Errorf("inflated[%d]:\ngot %q\nwant %q", i, inflated[i], s)
}
}
}
func TestReaderTruncated(t *testing.T) {
vectors := []struct{ input, output string }{
{"\x00", ""},
{"\x00\f", ""},
{"\x00\f\x00", ""},
{"\x00\f\x00\xf3\xff", ""},
{"\x00\f\x00\xf3\xffhello", "hello"},
{"\x00\f\x00\xf3\xffhello, world", "hello, world"},
{"\x02", ""},
{"\xf2H\xcd", "He"},
{"\xf2H͙0a\u0084\t", "Hel\x90\x90\x90\x90\x90"},
{"\xf2H͙0a\u0084\t\x00", "Hel\x90\x90\x90\x90\x90"},
}
for i, v := range vectors {
r := strings.NewReader(v.input)
zr := NewReader(r)
b, err := io.ReadAll(zr)
if err != io.ErrUnexpectedEOF {
t.Errorf("test %d, error mismatch: got %v, want io.ErrUnexpectedEOF", i, err)
}
if string(b) != v.output {
t.Errorf("test %d, output mismatch: got %q, want %q", i, b, v.output)
}
}
}
func TestResetDict(t *testing.T) {
dict := []byte("the lorem fox")
ss := []string{
"lorem ipsum izzle fo rizzle",
"the quick brown fox jumped over",
}
deflated := make([]bytes.Buffer, len(ss))
for i, s := range ss {
w, _ := NewWriterDict(&deflated[i], DefaultCompression, dict)
w.Write([]byte(s))
w.Close()
}
inflated := make([]bytes.Buffer, len(ss))
f := NewReader(nil)
for i := range inflated {
f.(Resetter).Reset(&deflated[i], dict)
io.Copy(&inflated[i], f)
}
f.Close()
for i, s := range ss {
if s != inflated[i].String() {
t.Errorf("inflated[%d]:\ngot %q\nwant %q", i, inflated[i], s)
}
}
}
func TestReaderReusesReaderBuffer(t *testing.T) {
encodedReader := bytes.NewReader([]byte{})
encodedNotByteReader := struct{ io.Reader }{encodedReader}
t.Run("BufferIsReused", func(t *testing.T) {
f := NewReader(encodedNotByteReader).(*decompressor)
bufioR, ok := f.r.(*bufio.Reader)
if !ok {
t.Fatalf("bufio.Reader should be created")
}
f.Reset(encodedNotByteReader, nil)
if bufioR != f.r {
t.Fatalf("bufio.Reader was not reused")
}
})
t.Run("BufferIsNotReusedWhenGotByteReader", func(t *testing.T) {
f := NewReader(encodedNotByteReader).(*decompressor)
if _, ok := f.r.(*bufio.Reader); !ok {
t.Fatalf("bufio.Reader should be created")
}
f.Reset(encodedReader, nil)
if f.r != encodedReader {
t.Fatalf("provided io.ByteReader should be used directly")
}
})
t.Run("BufferIsCreatedAfterByteReader", func(t *testing.T) {
for i, r := range []io.Reader{encodedReader, bufio.NewReader(encodedReader)} {
f := NewReader(r).(*decompressor)
if f.r != r {
t.Fatalf("provided io.ByteReader should be used directly, i=%d", i)
}
f.Reset(encodedNotByteReader, nil)
if _, ok := f.r.(*bufio.Reader); !ok {
t.Fatalf("bufio.Reader should be created, i=%d", i)
}
}
})
}