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// Copyright 2011 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 internal
import (
"bufio"
"bytes"
"fmt"
"io"
"strings"
"testing"
"testing/iotest"
)
func TestChunk(t *testing.T) {
var b bytes.Buffer
w := NewChunkedWriter(&b)
const chunk1 = "hello, "
const chunk2 = "world! 0123456789abcdef"
w.Write([]byte(chunk1))
w.Write([]byte(chunk2))
w.Close()
if g, e := b.String(), "7\r\nhello, \r\n17\r\nworld! 0123456789abcdef\r\n0\r\n"; g != e {
t.Fatalf("chunk writer wrote %q; want %q", g, e)
}
r := NewChunkedReader(&b)
data, err := io.ReadAll(r)
if err != nil {
t.Logf(`data: "%s"`, data)
t.Fatalf("ReadAll from reader: %v", err)
}
if g, e := string(data), chunk1+chunk2; g != e {
t.Errorf("chunk reader read %q; want %q", g, e)
}
}
func TestChunkReadMultiple(t *testing.T) {
// Bunch of small chunks, all read together.
{
var b bytes.Buffer
w := NewChunkedWriter(&b)
w.Write([]byte("foo"))
w.Write([]byte("bar"))
w.Close()
r := NewChunkedReader(&b)
buf := make([]byte, 10)
n, err := r.Read(buf)
if n != 6 || err != io.EOF {
t.Errorf("Read = %d, %v; want 6, EOF", n, err)
}
buf = buf[:n]
if string(buf) != "foobar" {
t.Errorf("Read = %q; want %q", buf, "foobar")
}
}
// One big chunk followed by a little chunk, but the small bufio.Reader size
// should prevent the second chunk header from being read.
{
var b bytes.Buffer
w := NewChunkedWriter(&b)
// fillBufChunk is 11 bytes + 3 bytes header + 2 bytes footer = 16 bytes,
// the same as the bufio ReaderSize below (the minimum), so even
// though we're going to try to Read with a buffer larger enough to also
// receive "foo", the second chunk header won't be read yet.
const fillBufChunk = "0123456789a"
const shortChunk = "foo"
w.Write([]byte(fillBufChunk))
w.Write([]byte(shortChunk))
w.Close()
r := NewChunkedReader(bufio.NewReaderSize(&b, 16))
buf := make([]byte, len(fillBufChunk)+len(shortChunk))
n, err := r.Read(buf)
if n != len(fillBufChunk) || err != nil {
t.Errorf("Read = %d, %v; want %d, nil", n, err, len(fillBufChunk))
}
buf = buf[:n]
if string(buf) != fillBufChunk {
t.Errorf("Read = %q; want %q", buf, fillBufChunk)
}
n, err = r.Read(buf)
if n != len(shortChunk) || err != io.EOF {
t.Errorf("Read = %d, %v; want %d, EOF", n, err, len(shortChunk))
}
}
// And test that we see an EOF chunk, even though our buffer is already full:
{
r := NewChunkedReader(bufio.NewReader(strings.NewReader("3\r\nfoo\r\n0\r\n")))
buf := make([]byte, 3)
n, err := r.Read(buf)
if n != 3 || err != io.EOF {
t.Errorf("Read = %d, %v; want 3, EOF", n, err)
}
if string(buf) != "foo" {
t.Errorf("buf = %q; want foo", buf)
}
}
}
func TestChunkReaderAllocs(t *testing.T) {
if testing.Short() {
t.Skip("skipping in short mode")
}
var buf bytes.Buffer
w := NewChunkedWriter(&buf)
a, b, c := []byte("aaaaaa"), []byte("bbbbbbbbbbbb"), []byte("cccccccccccccccccccccccc")
w.Write(a)
w.Write(b)
w.Write(c)
w.Close()
readBuf := make([]byte, len(a)+len(b)+len(c)+1)
byter := bytes.NewReader(buf.Bytes())
bufr := bufio.NewReader(byter)
mallocs := testing.AllocsPerRun(100, func() {
byter.Seek(0, io.SeekStart)
bufr.Reset(byter)
r := NewChunkedReader(bufr)
n, err := io.ReadFull(r, readBuf)
if n != len(readBuf)-1 {
t.Fatalf("read %d bytes; want %d", n, len(readBuf)-1)
}
if err != io.ErrUnexpectedEOF {
t.Fatalf("read error = %v; want ErrUnexpectedEOF", err)
}
})
if mallocs > 1.5 {
t.Errorf("mallocs = %v; want 1", mallocs)
}
}
func TestParseHexUint(t *testing.T) {
type testCase struct {
in string
want uint64
wantErr string
}
tests := []testCase{
{"x", 0, "invalid byte in chunk length"},
{"0000000000000000", 0, ""},
{"0000000000000001", 1, ""},
{"ffffffffffffffff", 1<<64 - 1, ""},
{"000000000000bogus", 0, "invalid byte in chunk length"},
{"00000000000000000", 0, "http chunk length too large"}, // could accept if we wanted
{"10000000000000000", 0, "http chunk length too large"},
{"00000000000000001", 0, "http chunk length too large"}, // could accept if we wanted
{"", 0, "empty hex number for chunk length"},
}
for i := uint64(0); i <= 1234; i++ {
tests = append(tests, testCase{in: fmt.Sprintf("%x", i), want: i})
}
for _, tt := range tests {
got, err := parseHexUint([]byte(tt.in))
if tt.wantErr != "" {
if !strings.Contains(fmt.Sprint(err), tt.wantErr) {
t.Errorf("parseHexUint(%q) = %v, %v; want error %q", tt.in, got, err, tt.wantErr)
}
} else {
if err != nil || got != tt.want {
t.Errorf("parseHexUint(%q) = %v, %v; want %v", tt.in, got, err, tt.want)
}
}
}
}
func TestChunkReadingIgnoresExtensions(t *testing.T) {
in := "7;ext=\"some quoted string\"\r\n" + // token=quoted string
"hello, \r\n" +
"17;someext\r\n" + // token without value
"world! 0123456789abcdef\r\n" +
"0;someextension=sometoken\r\n" // token=token
data, err := io.ReadAll(NewChunkedReader(strings.NewReader(in)))
if err != nil {
t.Fatalf("ReadAll = %q, %v", data, err)
}
if g, e := string(data), "hello, world! 0123456789abcdef"; g != e {
t.Errorf("read %q; want %q", g, e)
}
}
// Issue 17355: ChunkedReader shouldn't block waiting for more data
// if it can return something.
func TestChunkReadPartial(t *testing.T) {
pr, pw := io.Pipe()
go func() {
pw.Write([]byte("7\r\n1234567"))
}()
cr := NewChunkedReader(pr)
readBuf := make([]byte, 7)
n, err := cr.Read(readBuf)
if err != nil {
t.Fatal(err)
}
want := "1234567"
if n != 7 || string(readBuf) != want {
t.Fatalf("Read: %v %q; want %d, %q", n, readBuf[:n], len(want), want)
}
go func() {
pw.Write([]byte("xx"))
}()
_, err = cr.Read(readBuf)
if got := fmt.Sprint(err); !strings.Contains(got, "malformed") {
t.Fatalf("second read = %v; want malformed error", err)
}
}
// Issue 48861: ChunkedReader should report incomplete chunks
func TestIncompleteChunk(t *testing.T) {
const valid = "4\r\nabcd\r\n" + "5\r\nabc\r\n\r\n" + "0\r\n"
for i := 0; i < len(valid); i++ {
incomplete := valid[:i]
r := NewChunkedReader(strings.NewReader(incomplete))
if _, err := io.ReadAll(r); err != io.ErrUnexpectedEOF {
t.Errorf("expected io.ErrUnexpectedEOF for %q, got %v", incomplete, err)
}
}
r := NewChunkedReader(strings.NewReader(valid))
if _, err := io.ReadAll(r); err != nil {
t.Errorf("unexpected error for %q: %v", valid, err)
}
}
func TestChunkEndReadError(t *testing.T) {
readErr := fmt.Errorf("chunk end read error")
r := NewChunkedReader(io.MultiReader(strings.NewReader("4\r\nabcd"), iotest.ErrReader(readErr)))
if _, err := io.ReadAll(r); err != readErr {
t.Errorf("expected %v, got %v", readErr, err)
}
}
func TestChunkReaderTooMuchOverhead(t *testing.T) {
// If the sender is sending 100x as many chunk header bytes as chunk data,
// we should reject the stream at some point.
chunk := []byte("1;")
for i := 0; i < 100; i++ {
chunk = append(chunk, 'a') // chunk extension
}
chunk = append(chunk, "\r\nX\r\n"...)
const bodylen = 1 << 20
r := NewChunkedReader(&funcReader{f: func(i int) ([]byte, error) {
if i < bodylen {
return chunk, nil
}
return []byte("0\r\n"), nil
}})
_, err := io.ReadAll(r)
if err == nil {
t.Fatalf("successfully read body with excessive overhead; want error")
}
}
func TestChunkReaderByteAtATime(t *testing.T) {
// Sending one byte per chunk should not trip the excess-overhead detection.
const bodylen = 1 << 20
r := NewChunkedReader(&funcReader{f: func(i int) ([]byte, error) {
if i < bodylen {
return []byte("1\r\nX\r\n"), nil
}
return []byte("0\r\n"), nil
}})
got, err := io.ReadAll(r)
if err != nil {
t.Errorf("unexpected error: %v", err)
}
if len(got) != bodylen {
t.Errorf("read %v bytes, want %v", len(got), bodylen)
}
}
type funcReader struct {
f func(iteration int) ([]byte, error)
i int
b []byte
err error
}
func (r *funcReader) Read(p []byte) (n int, err error) {
if len(r.b) == 0 && r.err == nil {
r.b, r.err = r.f(r.i)
r.i++
}
n = copy(p, r.b)
r.b = r.b[n:]
if len(r.b) > 0 {
return n, nil
}
return n, r.err
}