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src/net: remove existing files to replace with submodule

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Signed-off-by: deadprogram <ron@hybridgroup.com>
Этот коммит содержится в:
deadprogram 2023-05-04 16:51:18 +02:00 • коммит произвёл Ron Evans
родитель 338590cc75
коммит e4f551ac7f
16 изменённых файлов: 0 добавлений и 2690 удалений
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478
src/net/conn_test.go
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@ -1,478 +0,0 @@
// The following is copied from x/net official implementation.
// Source: https://cs.opensource.google/go/x/net/+/f15817d1:nettest/conntest.go
// Changes from original the file:
// - Some variables are pulled in from nettest/nettest.go file.
// - The implementation of checkForTimeoutError() function is changed in
// accordance with error returned by the Pipe implementation.
// Copyright 2016 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 net
import (
"bytes"
"encoding/binary"
"io"
"io/ioutil"
"math/rand"
"os"
"runtime"
"sync"
"testing"
"time"
)
// The following variables are copied from nettest/nettest.go file
var (
aLongTimeAgo = time.Unix(233431200, 0)
neverTimeout = time.Time{}
)
// MakePipe creates a connection between two endpoints and returns the pair
// as c1 and c2, such that anything written to c1 is read by c2 and vice-versa.
// The stop function closes all resources, including c1, c2, and the underlying
// Listener (if there is one), and should not be nil.
type MakePipe func() (c1, c2 Conn, stop func(), err error)
// testConn tests that a Conn implementation properly satisfies the interface.
// The tests should not produce any false positives, but may experience
// false negatives. Thus, some issues may only be detected when the test is
// run multiple times. For maximal effectiveness, run the tests under the
// race detector.
func testConn(t *testing.T, mp MakePipe) {
t.Run("BasicIO", func(t *testing.T) { timeoutWrapper(t, mp, testBasicIO) })
t.Run("PingPong", func(t *testing.T) { timeoutWrapper(t, mp, testPingPong) })
t.Run("RacyRead", func(t *testing.T) { timeoutWrapper(t, mp, testRacyRead) })
t.Run("RacyWrite", func(t *testing.T) { timeoutWrapper(t, mp, testRacyWrite) })
t.Run("ReadTimeout", func(t *testing.T) { timeoutWrapper(t, mp, testReadTimeout) })
t.Run("WriteTimeout", func(t *testing.T) { timeoutWrapper(t, mp, testWriteTimeout) })
t.Run("PastTimeout", func(t *testing.T) { timeoutWrapper(t, mp, testPastTimeout) })
t.Run("PresentTimeout", func(t *testing.T) { timeoutWrapper(t, mp, testPresentTimeout) })
t.Run("FutureTimeout", func(t *testing.T) { timeoutWrapper(t, mp, testFutureTimeout) })
t.Run("CloseTimeout", func(t *testing.T) { timeoutWrapper(t, mp, testCloseTimeout) })
t.Run("ConcurrentMethods", func(t *testing.T) { timeoutWrapper(t, mp, testConcurrentMethods) })
}
type connTester func(t *testing.T, c1, c2 Conn)
func timeoutWrapper(t *testing.T, mp MakePipe, f connTester) {
t.Helper()
c1, c2, stop, err := mp()
if err != nil {
t.Fatalf("unable to make pipe: %v", err)
}
var once sync.Once
defer once.Do(func() { stop() })
timer := time.AfterFunc(time.Minute, func() {
once.Do(func() {
t.Error("test timed out; terminating pipe")
stop()
})
})
defer timer.Stop()
f(t, c1, c2)
}
// testBasicIO tests that the data sent on c1 is properly received on c2.
func testBasicIO(t *testing.T, c1, c2 Conn) {
want := make([]byte, 1<<20)
rand.New(rand.NewSource(0)).Read(want)
dataCh := make(chan []byte)
go func() {
rd := bytes.NewReader(want)
if err := chunkedCopy(c1, rd); err != nil {
t.Errorf("unexpected c1.Write error: %v", err)
}
if err := c1.Close(); err != nil {
t.Errorf("unexpected c1.Close error: %v", err)
}
}()
go func() {
wr := new(bytes.Buffer)
if err := chunkedCopy(wr, c2); err != nil {
t.Errorf("unexpected c2.Read error: %v", err)
}
if err := c2.Close(); err != nil {
t.Errorf("unexpected c2.Close error: %v", err)
}
dataCh <- wr.Bytes()
}()
if got := <-dataCh; !bytes.Equal(got, want) {
t.Error("transmitted data differs")
}
}
// testPingPong tests that the two endpoints can synchronously send data to
// each other in a typical request-response pattern.
func testPingPong(t *testing.T, c1, c2 Conn) {
var wg sync.WaitGroup
defer wg.Wait()
pingPonger := func(c Conn) {
defer wg.Done()
buf := make([]byte, 8)
var prev uint64
for {
if _, err := io.ReadFull(c, buf); err != nil {
if err == io.EOF {
break
}
t.Errorf("unexpected Read error: %v", err)
}
v := binary.LittleEndian.Uint64(buf)
binary.LittleEndian.PutUint64(buf, v+1)
if prev != 0 && prev+2 != v {
t.Errorf("mismatching value: got %d, want %d", v, prev+2)
}
prev = v
if v == 1000 {
break
}
if _, err := c.Write(buf); err != nil {
t.Errorf("unexpected Write error: %v", err)
break
}
}
if err := c.Close(); err != nil {
t.Errorf("unexpected Close error: %v", err)
}
}
wg.Add(2)
go pingPonger(c1)
go pingPonger(c2)
// Start off the chain reaction.
if _, err := c1.Write(make([]byte, 8)); err != nil {
t.Errorf("unexpected c1.Write error: %v", err)
}
}
// testRacyRead tests that it is safe to mutate the input Read buffer
// immediately after cancelation has occurred.
func testRacyRead(t *testing.T, c1, c2 Conn) {
go chunkedCopy(c2, rand.New(rand.NewSource(0)))
var wg sync.WaitGroup
defer wg.Wait()
c1.SetReadDeadline(time.Now().Add(time.Millisecond))
for i := 0; i < 10; i++ {
wg.Add(1)
go func() {
defer wg.Done()
b1 := make([]byte, 1024)
b2 := make([]byte, 1024)
for j := 0; j < 100; j++ {
_, err := c1.Read(b1)
copy(b1, b2) // Mutate b1 to trigger potential race
if err != nil {
checkForTimeoutError(t, err)
c1.SetReadDeadline(time.Now().Add(time.Millisecond))
}
}
}()
}
}
// testRacyWrite tests that it is safe to mutate the input Write buffer
// immediately after cancelation has occurred.
func testRacyWrite(t *testing.T, c1, c2 Conn) {
go chunkedCopy(ioutil.Discard, c2)
var wg sync.WaitGroup
defer wg.Wait()
c1.SetWriteDeadline(time.Now().Add(time.Millisecond))
for i := 0; i < 10; i++ {
wg.Add(1)
go func() {
defer wg.Done()
b1 := make([]byte, 1024)
b2 := make([]byte, 1024)
for j := 0; j < 100; j++ {
_, err := c1.Write(b1)
copy(b1, b2) // Mutate b1 to trigger potential race
if err != nil {
checkForTimeoutError(t, err)
c1.SetWriteDeadline(time.Now().Add(time.Millisecond))
}
}
}()
}
}
// testReadTimeout tests that Read timeouts do not affect Write.
func testReadTimeout(t *testing.T, c1, c2 Conn) {
go chunkedCopy(ioutil.Discard, c2)
c1.SetReadDeadline(aLongTimeAgo)
_, err := c1.Read(make([]byte, 1024))
checkForTimeoutError(t, err)
if _, err := c1.Write(make([]byte, 1024)); err != nil {
t.Errorf("unexpected Write error: %v", err)
}
}
// testWriteTimeout tests that Write timeouts do not affect Read.
func testWriteTimeout(t *testing.T, c1, c2 Conn) {
go chunkedCopy(c2, rand.New(rand.NewSource(0)))
c1.SetWriteDeadline(aLongTimeAgo)
_, err := c1.Write(make([]byte, 1024))
checkForTimeoutError(t, err)
if _, err := c1.Read(make([]byte, 1024)); err != nil {
t.Errorf("unexpected Read error: %v", err)
}
}
// testPastTimeout tests that a deadline set in the past immediately times out
// Read and Write requests.
func testPastTimeout(t *testing.T, c1, c2 Conn) {
go chunkedCopy(c2, c2)
testRoundtrip(t, c1)
c1.SetDeadline(aLongTimeAgo)
n, err := c1.Write(make([]byte, 1024))
if n != 0 {
t.Errorf("unexpected Write count: got %d, want 0", n)
}
checkForTimeoutError(t, err)
n, err = c1.Read(make([]byte, 1024))
if n != 0 {
t.Errorf("unexpected Read count: got %d, want 0", n)
}
checkForTimeoutError(t, err)
testRoundtrip(t, c1)
}
// testPresentTimeout tests that a past deadline set while there are pending
// Read and Write operations immediately times out those operations.
func testPresentTimeout(t *testing.T, c1, c2 Conn) {
var wg sync.WaitGroup
defer wg.Wait()
wg.Add(3)
deadlineSet := make(chan bool, 1)
go func() {
defer wg.Done()
time.Sleep(100 * time.Millisecond)
deadlineSet <- true
c1.SetReadDeadline(aLongTimeAgo)
c1.SetWriteDeadline(aLongTimeAgo)
}()
go func() {
defer wg.Done()
n, err := c1.Read(make([]byte, 1024))
if n != 0 {
t.Errorf("unexpected Read count: got %d, want 0", n)
}
checkForTimeoutError(t, err)
if len(deadlineSet) == 0 {
t.Error("Read timed out before deadline is set")
}
}()
go func() {
defer wg.Done()
var err error
for err == nil {
_, err = c1.Write(make([]byte, 1024))
}
checkForTimeoutError(t, err)
if len(deadlineSet) == 0 {
t.Error("Write timed out before deadline is set")
}
}()
}
// testFutureTimeout tests that a future deadline will eventually time out
// Read and Write operations.
func testFutureTimeout(t *testing.T, c1, c2 Conn) {
var wg sync.WaitGroup
wg.Add(2)
c1.SetDeadline(time.Now().Add(100 * time.Millisecond))
go func() {
defer wg.Done()
_, err := c1.Read(make([]byte, 1024))
checkForTimeoutError(t, err)
}()
go func() {
defer wg.Done()
var err error
for err == nil {
_, err = c1.Write(make([]byte, 1024))
}
checkForTimeoutError(t, err)
}()
wg.Wait()
go chunkedCopy(c2, c2)
resyncConn(t, c1)
testRoundtrip(t, c1)
}
// testCloseTimeout tests that calling Close immediately times out pending
// Read and Write operations.
func testCloseTimeout(t *testing.T, c1, c2 Conn) {
go chunkedCopy(c2, c2)
var wg sync.WaitGroup
defer wg.Wait()
wg.Add(3)
// Test for cancelation upon connection closure.
c1.SetDeadline(neverTimeout)
go func() {
defer wg.Done()
time.Sleep(100 * time.Millisecond)
c1.Close()
}()
go func() {
defer wg.Done()
var err error
buf := make([]byte, 1024)
for err == nil {
_, err = c1.Read(buf)
}
}()
go func() {
defer wg.Done()
var err error
buf := make([]byte, 1024)
for err == nil {
_, err = c1.Write(buf)
}
}()
}
// testConcurrentMethods tests that the methods of Conn can safely
// be called concurrently.
func testConcurrentMethods(t *testing.T, c1, c2 Conn) {
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; see https://golang.org/issue/20489")
}
go chunkedCopy(c2, c2)
// The results of the calls may be nonsensical, but this should
// not trigger a race detector warning.
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(7)
go func() {
defer wg.Done()
c1.Read(make([]byte, 1024))
}()
go func() {
defer wg.Done()
c1.Write(make([]byte, 1024))
}()
go func() {
defer wg.Done()
c1.SetDeadline(time.Now().Add(10 * time.Millisecond))
}()
go func() {
defer wg.Done()
c1.SetReadDeadline(aLongTimeAgo)
}()
go func() {
defer wg.Done()
c1.SetWriteDeadline(aLongTimeAgo)
}()
go func() {
defer wg.Done()
c1.LocalAddr()
}()
go func() {
defer wg.Done()
c1.RemoteAddr()
}()
}
wg.Wait() // At worst, the deadline is set 10ms into the future
resyncConn(t, c1)
testRoundtrip(t, c1)
}
// checkForTimeoutError checks that the error satisfies the OpError interface
// and that underlying Err is os.ErrDeadlineExceeded
func checkForTimeoutError(t *testing.T, err error) {
t.Helper()
operr, ok := err.(*OpError)
if !ok {
t.Errorf("got %T: %v, want OpError", err, err)
return
}
if operr.Err != os.ErrDeadlineExceeded {
t.Errorf("got %T: %v, want os.ErrDeadlineExceeded", err, err)
}
}
// testRoundtrip writes something into c and reads it back.
// It assumes that everything written into c is echoed back to itself.
func testRoundtrip(t *testing.T, c Conn) {
t.Helper()
if err := c.SetDeadline(neverTimeout); err != nil {
t.Errorf("roundtrip SetDeadline error: %v", err)
}
const s = "Hello, world!"
buf := []byte(s)
if _, err := c.Write(buf); err != nil {
t.Errorf("roundtrip Write error: %v", err)
}
if _, err := io.ReadFull(c, buf); err != nil {
t.Errorf("roundtrip Read error: %v", err)
}
if string(buf) != s {
t.Errorf("roundtrip data mismatch: got %q, want %q", buf, s)
}
}
// resyncConn resynchronizes the connection into a sane state.
// It assumes that everything written into c is echoed back to itself.
// It assumes that 0xff is not currently on the wire or in the read buffer.
func resyncConn(t *testing.T, c Conn) {
t.Helper()
c.SetDeadline(neverTimeout)
errCh := make(chan error)
go func() {
_, err := c.Write([]byte{0xff})
errCh <- err
}()
buf := make([]byte, 1024)
for {
n, err := c.Read(buf)
if n > 0 && bytes.IndexByte(buf[:n], 0xff) == n-1 {
break
}
if err != nil {
t.Errorf("unexpected Read error: %v", err)
break
}
}
if err := <-errCh; err != nil {
t.Errorf("unexpected Write error: %v", err)
}
}
// chunkedCopy copies from r to w in fixed-width chunks to avoid
// causing a Write that exceeds the maximum packet size for packet-based
// connections like "unixpacket".
// We assume that the maximum packet size is at least 1024.
func chunkedCopy(w io.Writer, r io.Reader) error {
b := make([]byte, 1024)
_, err := io.CopyBuffer(struct{ io.Writer }{w}, struct{ io.Reader }{r}, b)
return err
}

25
src/net/dial.go
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@ -1,25 +0,0 @@
package net
import (
"context"
"time"
)
type Dialer struct {
Timeout time.Duration
Deadline time.Time
DualStack bool
KeepAlive time.Duration
}
func Dial(network, address string) (Conn, error) {
return nil, ErrNotImplemented
}
func Listen(network, address string) (Listener, error) {
return nil, ErrNotImplemented
}
func (d *Dialer) DialContext(ctx context.Context, network, address string) (Conn, error) {
return nil, ErrNotImplemented
}

10
src/net/errors.go
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@ -1,10 +0,0 @@
package net
import "errors"
var (
// copied from poll.ErrNetClosing
errClosed = errors.New("use of closed network connection")
ErrNotImplemented = errors.New("operation not implemented")
)

253
src/net/interface.go
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@ -1,253 +0,0 @@
// The following is copied from Go 1.16 official implementation.
// 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 net
import (
"errors"
"internal/itoa"
"sync"
"time"
)
var (
errInvalidInterface = errors.New("invalid network interface")
errInvalidInterfaceIndex = errors.New("invalid network interface index")
errInvalidInterfaceName = errors.New("invalid network interface name")
errNoSuchInterface = errors.New("no such network interface")
errNoSuchMulticastInterface = errors.New("no such multicast network interface")
)
// Interface represents a mapping between network interface name
// and index. It also represents network interface facility
// information.
type Interface struct {
Index int // positive integer that starts at one, zero is never used
MTU int // maximum transmission unit
Name string // e.g., "en0", "lo0", "eth0.100"
HardwareAddr HardwareAddr // IEEE MAC-48, EUI-48 and EUI-64 form
Flags Flags // e.g., FlagUp, FlagLoopback, FlagMulticast
}
type Flags uint
const (
FlagUp Flags = 1 << iota // interface is up
FlagBroadcast // interface supports broadcast access capability
FlagLoopback // interface is a loopback interface
FlagPointToPoint // interface belongs to a point-to-point link
FlagMulticast // interface supports multicast access capability
)
var flagNames = []string{
"up",
"broadcast",
"loopback",
"pointtopoint",
"multicast",
}
func (f Flags) String() string {
s := ""
for i, name := range flagNames {
if f&(1<<uint(i)) != 0 {
if s != "" {
s += "|"
}
s += name
}
}
if s == "" {
s = "0"
}
return s
}
// Addrs returns a list of unicast interface addresses for a specific
// interface.
func (ifi *Interface) Addrs() ([]Addr, error) {
if ifi == nil {
return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterface}
}
ifat, err := interfaceAddrTable(ifi)
if err != nil {
err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
}
return ifat, err
}
// MulticastAddrs returns a list of multicast, joined group addresses
// for a specific interface.
func (ifi *Interface) MulticastAddrs() ([]Addr, error) {
if ifi == nil {
return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterface}
}
ifat, err := interfaceMulticastAddrTable(ifi)
if err != nil {
err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
}
return ifat, err
}
// Interfaces returns a list of the system's network interfaces.
func Interfaces() ([]Interface, error) {
ift, err := interfaceTable(0)
if err != nil {
return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
}
if len(ift) != 0 {
zoneCache.update(ift, false)
}
return ift, nil
}
// InterfaceAddrs returns a list of the system's unicast interface
// addresses.
//
// The returned list does not identify the associated interface; use
// Interfaces and Interface.Addrs for more detail.
func InterfaceAddrs() ([]Addr, error) {
ifat, err := interfaceAddrTable(nil)
if err != nil {
err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
}
return ifat, err
}
// InterfaceByIndex returns the interface specified by index.
//
// On Solaris, it returns one of the logical network interfaces
// sharing the logical data link; for more precision use
// InterfaceByName.
func InterfaceByIndex(index int) (*Interface, error) {
if index <= 0 {
return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterfaceIndex}
}
ift, err := interfaceTable(index)
if err != nil {
return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
}
ifi, err := interfaceByIndex(ift, index)
if err != nil {
err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
}
return ifi, err
}
func interfaceByIndex(ift []Interface, index int) (*Interface, error) {
for _, ifi := range ift {
if index == ifi.Index {
return &ifi, nil
}
}
return nil, errNoSuchInterface
}
// InterfaceByName returns the interface specified by name.
func InterfaceByName(name string) (*Interface, error) {
if name == "" {
return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterfaceName}
}
ift, err := interfaceTable(0)
if err != nil {
return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
}
if len(ift) != 0 {
zoneCache.update(ift, false)
}
for _, ifi := range ift {
if name == ifi.Name {
return &ifi, nil
}
}
return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errNoSuchInterface}
}
// An ipv6ZoneCache represents a cache holding partial network
// interface information. It is used for reducing the cost of IPv6
// addressing scope zone resolution.
//
// Multiple names sharing the index are managed by first-come
// first-served basis for consistency.
type ipv6ZoneCache struct {
sync.RWMutex // guard the following
lastFetched time.Time // last time routing information was fetched
toIndex map[string]int // interface name to its index
toName map[int]string // interface index to its name
}
var zoneCache = ipv6ZoneCache{
toIndex: make(map[string]int),
toName: make(map[int]string),
}
// update refreshes the network interface information if the cache was last
// updated more than 1 minute ago, or if force is set. It reports whether the
// cache was updated.
func (zc *ipv6ZoneCache) update(ift []Interface, force bool) (updated bool) {
zc.Lock()
defer zc.Unlock()
now := time.Now()
if !force && zc.lastFetched.After(now.Add(-60*time.Second)) {
return false
}
zc.lastFetched = now
if len(ift) == 0 {
var err error
if ift, err = interfaceTable(0); err != nil {
return false
}
}
zc.toIndex = make(map[string]int, len(ift))
zc.toName = make(map[int]string, len(ift))
for _, ifi := range ift {
zc.toIndex[ifi.Name] = ifi.Index
if _, ok := zc.toName[ifi.Index]; !ok {
zc.toName[ifi.Index] = ifi.Name
}
}
return true
}
func (zc *ipv6ZoneCache) name(index int) string {
if index == 0 {
return ""
}
updated := zoneCache.update(nil, false)
zoneCache.RLock()
name, ok := zoneCache.toName[index]
zoneCache.RUnlock()
if !ok && !updated {
zoneCache.update(nil, true)
zoneCache.RLock()
name, ok = zoneCache.toName[index]
zoneCache.RUnlock()
}
if !ok { // last resort
name = itoa.Uitoa(uint(index))
}
return name
}
func (zc *ipv6ZoneCache) index(name string) int {
if name == "" {
return 0
}
updated := zoneCache.update(nil, false)
zoneCache.RLock()
index, ok := zoneCache.toIndex[name]
zoneCache.RUnlock()
if !ok && !updated {
zoneCache.update(nil, true)
zoneCache.RLock()
index, ok = zoneCache.toIndex[name]
zoneCache.RUnlock()
}
if !ok { // last resort
index, _, _ = dtoi(name)
}
return index
}

53
src/net/interface_tinygo.go
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@ -1,53 +0,0 @@
//go:build tinygo
package net
const (
tinyGoInterfaceName = "tinygo-undefined"
maxTransmissionUnit = 1500 // Ethernet?
)
// DE:AD:BE:EF:FE:FF
var defaultMAC = HardwareAddr{0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xFF}
// If the ifindex is zero, interfaceTable returns mappings of all
// network interfaces. Otherwise it returns a mapping of a specific
// interface.
func interfaceTable(ifindex int) ([]Interface, error) {
i, err := readInterface(0)
if err != nil {
return nil, err
}
return []Interface{*i}, nil
}
func readInterface(i int) (*Interface, error) {
if i != 0 {
return nil, errInvalidInterfaceIndex
}
ifc := &Interface{
Index: i + 1, // Offset the index by one to suit the contract
Name: tinyGoInterfaceName,
MTU: maxTransmissionUnit,
HardwareAddr: defaultMAC,
Flags: 0, // No flags since interface is not implemented.
}
return ifc, nil
}
func interfaceCount() (int, error) {
return 1, nil
}
// If the ifi is nil, interfaceAddrTable returns addresses for all
// network interfaces. Otherwise it returns addresses for a specific
// interface.
func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
return nil, nil
}
// interfaceMulticastAddrTable returns addresses for a specific
// interface.
func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
return nil, nil
}

735
src/net/ip.go
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@ -1,735 +0,0 @@
// The following is copied from Go 1.16 official implementation.
// Copyright 2009 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.
// IP address manipulations
//
// IPv4 addresses are 4 bytes; IPv6 addresses are 16 bytes.
// An IPv4 address can be converted to an IPv6 address by
// adding a canonical prefix (10 zeros, 2 0xFFs).
// This library accepts either size of byte slice but always
// returns 16-byte addresses.
package net
import (
"internal/bytealg"
"internal/itoa"
)
// IP address lengths (bytes).
const (
IPv4len = 4
IPv6len = 16
)
// An IP is a single IP address, a slice of bytes.
// Functions in this package accept either 4-byte (IPv4)
// or 16-byte (IPv6) slices as input.
//
// Note that in this documentation, referring to an
// IP address as an IPv4 address or an IPv6 address
// is a semantic property of the address, not just the
// length of the byte slice: a 16-byte slice can still
// be an IPv4 address.
type IP []byte
// An IPMask is a bitmask that can be used to manipulate
// IP addresses for IP addressing and routing.
//
// See type IPNet and func ParseCIDR for details.
type IPMask []byte
// An IPNet represents an IP network.
type IPNet struct {
IP IP // network number
Mask IPMask // network mask
}
// IPv4 returns the IP address (in 16-byte form) of the
// IPv4 address a.b.c.d.
func IPv4(a, b, c, d byte) IP {
p := make(IP, IPv6len)
copy(p, v4InV6Prefix)
p[12] = a
p[13] = b
p[14] = c
p[15] = d
return p
}
var v4InV6Prefix = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff}
// IPv4Mask returns the IP mask (in 4-byte form) of the
// IPv4 mask a.b.c.d.
func IPv4Mask(a, b, c, d byte) IPMask {
p := make(IPMask, IPv4len)
p[0] = a
p[1] = b
p[2] = c
p[3] = d
return p
}
// CIDRMask returns an IPMask consisting of 'ones' 1 bits
// followed by 0s up to a total length of 'bits' bits.
// For a mask of this form, CIDRMask is the inverse of IPMask.Size.
func CIDRMask(ones, bits int) IPMask {
if bits != 8*IPv4len && bits != 8*IPv6len {
return nil
}
if ones < 0 || ones > bits {
return nil
}
l := bits / 8
m := make(IPMask, l)
n := uint(ones)
for i := 0; i < l; i++ {
if n >= 8 {
m[i] = 0xff
n -= 8
continue
}
m[i] = ^byte(0xff >> n)
n = 0
}
return m
}
// Well-known IPv4 addresses
var (
IPv4bcast = IPv4(255, 255, 255, 255) // limited broadcast
IPv4allsys = IPv4(224, 0, 0, 1) // all systems
IPv4allrouter = IPv4(224, 0, 0, 2) // all routers
IPv4zero = IPv4(0, 0, 0, 0) // all zeros
)
// Well-known IPv6 addresses
var (
IPv6zero = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
IPv6unspecified = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
IPv6loopback = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}
IPv6interfacelocalallnodes = IP{0xff, 0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01}
IPv6linklocalallnodes = IP{0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01}
IPv6linklocalallrouters = IP{0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x02}
)
// IsUnspecified reports whether ip is an unspecified address, either
// the IPv4 address "0.0.0.0" or the IPv6 address "::".
func (ip IP) IsUnspecified() bool {
return ip.Equal(IPv4zero) || ip.Equal(IPv6unspecified)
}
// IsLoopback reports whether ip is a loopback address.
func (ip IP) IsLoopback() bool {
if ip4 := ip.To4(); ip4 != nil {
return ip4[0] == 127
}
return ip.Equal(IPv6loopback)
}
// IsMulticast reports whether ip is a multicast address.
func (ip IP) IsMulticast() bool {
if ip4 := ip.To4(); ip4 != nil {
return ip4[0]&0xf0 == 0xe0
}
return len(ip) == IPv6len && ip[0] == 0xff
}
// IsInterfaceLocalMulticast reports whether ip is
// an interface-local multicast address.
func (ip IP) IsInterfaceLocalMulticast() bool {
return len(ip) == IPv6len && ip[0] == 0xff && ip[1]&0x0f == 0x01
}
// IsLinkLocalMulticast reports whether ip is a link-local
// multicast address.
func (ip IP) IsLinkLocalMulticast() bool {
if ip4 := ip.To4(); ip4 != nil {
return ip4[0] == 224 && ip4[1] == 0 && ip4[2] == 0
}
return len(ip) == IPv6len && ip[0] == 0xff && ip[1]&0x0f == 0x02
}
// IsLinkLocalUnicast reports whether ip is a link-local
// unicast address.
func (ip IP) IsLinkLocalUnicast() bool {
if ip4 := ip.To4(); ip4 != nil {
return ip4[0] == 169 && ip4[1] == 254
}
return len(ip) == IPv6len && ip[0] == 0xfe && ip[1]&0xc0 == 0x80
}
// IsGlobalUnicast reports whether ip is a global unicast
// address.
//
// The identification of global unicast addresses uses address type
// identification as defined in RFC 1122, RFC 4632 and RFC 4291 with
// the exception of IPv4 directed broadcast addresses.
// It returns true even if ip is in IPv4 private address space or
// local IPv6 unicast address space.
func (ip IP) IsGlobalUnicast() bool {
return (len(ip) == IPv4len || len(ip) == IPv6len) &&
!ip.Equal(IPv4bcast) &&
!ip.IsUnspecified() &&
!ip.IsLoopback() &&
!ip.IsMulticast() &&
!ip.IsLinkLocalUnicast()
}
// Is p all zeros?
func isZeros(p IP) bool {
for i := 0; i < len(p); i++ {
if p[i] != 0 {
return false
}
}
return true
}
// To4 converts the IPv4 address ip to a 4-byte representation.
// If ip is not an IPv4 address, To4 returns nil.
func (ip IP) To4() IP {
if len(ip) == IPv4len {
return ip
}
if len(ip) == IPv6len &&
isZeros(ip[0:10]) &&
ip[10] == 0xff &&
ip[11] == 0xff {
return ip[12:16]
}
return nil
}
// To16 converts the IP address ip to a 16-byte representation.
// If ip is not an IP address (it is the wrong length), To16 returns nil.
func (ip IP) To16() IP {
if len(ip) == IPv4len {
return IPv4(ip[0], ip[1], ip[2], ip[3])
}
if len(ip) == IPv6len {
return ip
}
return nil
}
// Default route masks for IPv4.
var (
classAMask = IPv4Mask(0xff, 0, 0, 0)
classBMask = IPv4Mask(0xff, 0xff, 0, 0)
classCMask = IPv4Mask(0xff, 0xff, 0xff, 0)
)
// DefaultMask returns the default IP mask for the IP address ip.
// Only IPv4 addresses have default masks; DefaultMask returns
// nil if ip is not a valid IPv4 address.
func (ip IP) DefaultMask() IPMask {
if ip = ip.To4(); ip == nil {
return nil
}
switch {
case ip[0] < 0x80:
return classAMask
case ip[0] < 0xC0:
return classBMask
default:
return classCMask
}
}
func allFF(b []byte) bool {
for _, c := range b {
if c != 0xff {
return false
}
}
return true
}
// Mask returns the result of masking the IP address ip with mask.
func (ip IP) Mask(mask IPMask) IP {
if len(mask) == IPv6len && len(ip) == IPv4len && allFF(mask[:12]) {
mask = mask[12:]
}
if len(mask) == IPv4len && len(ip) == IPv6len && bytealg.Equal(ip[:12], v4InV6Prefix) {
ip = ip[12:]
}
n := len(ip)
if n != len(mask) {
return nil
}
out := make(IP, n)
for i := 0; i < n; i++ {
out[i] = ip[i] & mask[i]
}
return out
}
// ubtoa encodes the string form of the integer v to dst[start:] and
// returns the number of bytes written to dst. The caller must ensure
// that dst has sufficient length.
func ubtoa(dst []byte, start int, v byte) int {
if v < 10 {
dst[start] = v + '0'
return 1
} else if v < 100 {
dst[start+1] = v%10 + '0'
dst[start] = v/10 + '0'
return 2
}
dst[start+2] = v%10 + '0'
dst[start+1] = (v/10)%10 + '0'
dst[start] = v/100 + '0'
return 3
}
// String returns the string form of the IP address ip.
// It returns one of 4 forms:
// - "<nil>", if ip has length 0
// - dotted decimal ("192.0.2.1"), if ip is an IPv4 or IP4-mapped IPv6 address
// - IPv6 ("2001:db8::1"), if ip is a valid IPv6 address
// - the hexadecimal form of ip, without punctuation, if no other cases apply
func (ip IP) String() string {
p := ip
if len(ip) == 0 {
return "<nil>"
}
// If IPv4, use dotted notation.
if p4 := p.To4(); len(p4) == IPv4len {
const maxIPv4StringLen = len("255.255.255.255")
b := make([]byte, maxIPv4StringLen)
n := ubtoa(b, 0, p4[0])
b[n] = '.'
n++
n += ubtoa(b, n, p4[1])
b[n] = '.'
n++
n += ubtoa(b, n, p4[2])
b[n] = '.'
n++
n += ubtoa(b, n, p4[3])
return string(b[:n])
}
if len(p) != IPv6len {
return "?" + hexString(ip)
}
// Find longest run of zeros.
e0 := -1
e1 := -1
for i := 0; i < IPv6len; i += 2 {
j := i
for j < IPv6len && p[j] == 0 && p[j+1] == 0 {
j += 2
}
if j > i && j-i > e1-e0 {
e0 = i
e1 = j
i = j
}
}
// The symbol "::" MUST NOT be used to shorten just one 16 bit 0 field.
if e1-e0 <= 2 {
e0 = -1
e1 = -1
}
const maxLen = len("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")
b := make([]byte, 0, maxLen)
// Print with possible :: in place of run of zeros
for i := 0; i < IPv6len; i += 2 {
if i == e0 {
b = append(b, ':', ':')
i = e1
if i >= IPv6len {
break
}
} else if i > 0 {
b = append(b, ':')
}
b = appendHex(b, (uint32(p[i])<<8)|uint32(p[i+1]))
}
return string(b)
}
func hexString(b []byte) string {
s := make([]byte, len(b)*2)
for i, tn := range b {
s[i*2], s[i*2+1] = hexDigit[tn>>4], hexDigit[tn&0xf]
}
return string(s)
}
// ipEmptyString is like ip.String except that it returns
// an empty string when ip is unset.
func ipEmptyString(ip IP) string {
if len(ip) == 0 {
return ""
}
return ip.String()
}
// MarshalText implements the encoding.TextMarshaler interface.
// The encoding is the same as returned by String, with one exception:
// When len(ip) is zero, it returns an empty slice.
func (ip IP) MarshalText() ([]byte, error) {
if len(ip) == 0 {
return []byte(""), nil
}
if len(ip) != IPv4len && len(ip) != IPv6len {
return nil, &AddrError{Err: "invalid IP address", Addr: hexString(ip)}
}
return []byte(ip.String()), nil
}
// UnmarshalText implements the encoding.TextUnmarshaler interface.
// The IP address is expected in a form accepted by ParseIP.
func (ip *IP) UnmarshalText(text []byte) error {
if len(text) == 0 {
*ip = nil
return nil
}
s := string(text)
x := ParseIP(s)
if x == nil {
return &ParseError{Type: "IP address", Text: s}
}
*ip = x
return nil
}
// Equal reports whether ip and x are the same IP address.
// An IPv4 address and that same address in IPv6 form are
// considered to be equal.
func (ip IP) Equal(x IP) bool {
if len(ip) == len(x) {
return bytealg.Equal(ip, x)
}
if len(ip) == IPv4len && len(x) == IPv6len {
return bytealg.Equal(x[0:12], v4InV6Prefix) && bytealg.Equal(ip, x[12:])
}
if len(ip) == IPv6len && len(x) == IPv4len {
return bytealg.Equal(ip[0:12], v4InV6Prefix) && bytealg.Equal(ip[12:], x)
}
return false
}
func (ip IP) matchAddrFamily(x IP) bool {
return ip.To4() != nil && x.To4() != nil || ip.To16() != nil && ip.To4() == nil && x.To16() != nil && x.To4() == nil
}
// If mask is a sequence of 1 bits followed by 0 bits,
// return the number of 1 bits.
func simpleMaskLength(mask IPMask) int {
var n int
for i, v := range mask {
if v == 0xff {
n += 8
continue
}
// found non-ff byte
// count 1 bits
for v&0x80 != 0 {
n++
v <<= 1
}
// rest must be 0 bits
if v != 0 {
return -1
}
for i++; i < len(mask); i++ {
if mask[i] != 0 {
return -1
}
}
break
}
return n
}
// Size returns the number of leading ones and total bits in the mask.
// If the mask is not in the canonical form--ones followed by zeros--then
// Size returns 0, 0.
func (m IPMask) Size() (ones, bits int) {
ones, bits = simpleMaskLength(m), len(m)*8
if ones == -1 {
return 0, 0
}
return
}
// String returns the hexadecimal form of m, with no punctuation.
func (m IPMask) String() string {
if len(m) == 0 {
return "<nil>"
}
return hexString(m)
}
func networkNumberAndMask(n *IPNet) (ip IP, m IPMask) {
if ip = n.IP.To4(); ip == nil {
ip = n.IP
if len(ip) != IPv6len {
return nil, nil
}
}
m = n.Mask
switch len(m) {
case IPv4len:
if len(ip) != IPv4len {
return nil, nil
}
case IPv6len:
if len(ip) == IPv4len {
m = m[12:]
}
default:
return nil, nil
}
return
}
// Contains reports whether the network includes ip.
func (n *IPNet) Contains(ip IP) bool {
nn, m := networkNumberAndMask(n)
if x := ip.To4(); x != nil {
ip = x
}
l := len(ip)
if l != len(nn) {
return false
}
for i := 0; i < l; i++ {
if nn[i]&m[i] != ip[i]&m[i] {
return false
}
}
return true
}
// Network returns the address's network name, "ip+net".
func (n *IPNet) Network() string { return "ip+net" }
// String returns the CIDR notation of n like "192.0.2.0/24"
// or "2001:db8::/48" as defined in RFC 4632 and RFC 4291.
// If the mask is not in the canonical form, it returns the
// string which consists of an IP address, followed by a slash
// character and a mask expressed as hexadecimal form with no
// punctuation like "198.51.100.0/c000ff00".
func (n *IPNet) String() string {
nn, m := networkNumberAndMask(n)
if nn == nil || m == nil {
return "<nil>"
}
l := simpleMaskLength(m)
if l == -1 {
return nn.String() + "/" + m.String()
}
return nn.String() + "/" + itoa.Uitoa(uint(l))
}
// Parse IPv4 address (d.d.d.d).
func parseIPv4(s string) IP {
var p [IPv4len]byte
for i := 0; i < IPv4len; i++ {
if len(s) == 0 {
// Missing octets.
return nil
}
if i > 0 {
if s[0] != '.' {
return nil
}
s = s[1:]
}
n, c, ok := dtoi(s)
if !ok || n > 0xFF {
return nil
}
s = s[c:]
p[i] = byte(n)
}
if len(s) != 0 {
return nil
}
return IPv4(p[0], p[1], p[2], p[3])
}
// parseIPv6Zone parses s as a literal IPv6 address and its associated zone
// identifier which is described in RFC 4007.
func parseIPv6Zone(s string) (IP, string) {
s, zone := splitHostZone(s)
return parseIPv6(s), zone
}
// parseIPv6 parses s as a literal IPv6 address described in RFC 4291
// and RFC 5952.
func parseIPv6(s string) (ip IP) {
ip = make(IP, IPv6len)
ellipsis := -1 // position of ellipsis in ip
// Might have leading ellipsis
if len(s) >= 2 && s[0] == ':' && s[1] == ':' {
ellipsis = 0
s = s[2:]
// Might be only ellipsis
if len(s) == 0 {
return ip
}
}
// Loop, parsing hex numbers followed by colon.
i := 0
for i < IPv6len {
// Hex number.
n, c, ok := xtoi(s)
if !ok || n > 0xFFFF {
return nil
}
// If followed by dot, might be in trailing IPv4.
if c < len(s) && s[c] == '.' {
if ellipsis < 0 && i != IPv6len-IPv4len {
// Not the right place.
return nil
}
if i+IPv4len > IPv6len {
// Not enough room.
return nil
}
ip4 := parseIPv4(s)
if ip4 == nil {
return nil
}
ip[i] = ip4[12]
ip[i+1] = ip4[13]
ip[i+2] = ip4[14]
ip[i+3] = ip4[15]
s = ""
i += IPv4len
break
}
// Save this 16-bit chunk.
ip[i] = byte(n >> 8)
ip[i+1] = byte(n)
i += 2
// Stop at end of string.
s = s[c:]
if len(s) == 0 {
break
}
// Otherwise must be followed by colon and more.
if s[0] != ':' || len(s) == 1 {
return nil
}
s = s[1:]
// Look for ellipsis.
if s[0] == ':' {
if ellipsis >= 0 { // already have one
return nil
}
ellipsis = i
s = s[1:]
if len(s) == 0 { // can be at end
break
}
}
}
// Must have used entire string.
if len(s) != 0 {
return nil
}
// If didn't parse enough, expand ellipsis.
if i < IPv6len {
if ellipsis < 0 {
return nil
}
n := IPv6len - i
for j := i - 1; j >= ellipsis; j-- {
ip[j+n] = ip[j]
}
for j := ellipsis + n - 1; j >= ellipsis; j-- {
ip[j] = 0
}
} else if ellipsis >= 0 {
// Ellipsis must represent at least one 0 group.
return nil
}
return ip
}
// ParseIP parses s as an IP address, returning the result.
// The string s can be in IPv4 dotted decimal ("192.0.2.1"), IPv6
// ("2001:db8::68"), or IPv4-mapped IPv6 ("::ffff:192.0.2.1") form.
// If s is not a valid textual representation of an IP address,
// ParseIP returns nil.
func ParseIP(s string) IP {
for i := 0; i < len(s); i++ {
switch s[i] {
case '.':
return parseIPv4(s)
case ':':
return parseIPv6(s)
}
}
return nil
}
// parseIPZone parses s as an IP address, return it and its associated zone
// identifier (IPv6 only).
func parseIPZone(s string) (IP, string) {
for i := 0; i < len(s); i++ {
switch s[i] {
case '.':
return parseIPv4(s), ""
case ':':
return parseIPv6Zone(s)
}
}
return nil, ""
}
// ParseCIDR parses s as a CIDR notation IP address and prefix length,
// like "192.0.2.0/24" or "2001:db8::/32", as defined in
// RFC 4632 and RFC 4291.
//
// It returns the IP address and the network implied by the IP and
// prefix length.
// For example, ParseCIDR("192.0.2.1/24") returns the IP address
// 192.0.2.1 and the network 192.0.2.0/24.
func ParseCIDR(s string) (IP, *IPNet, error) {
i := bytealg.IndexByteString(s, '/')
if i < 0 {
return nil, nil, &ParseError{Type: "CIDR address", Text: s}
}
addr, mask := s[:i], s[i+1:]
iplen := IPv4len
ip := parseIPv4(addr)
if ip == nil {
iplen = IPv6len
ip = parseIPv6(addr)
}
n, i, ok := dtoi(mask)
if ip == nil || !ok || i != len(mask) || n < 0 || n > 8*iplen {
return nil, nil, &ParseError{Type: "CIDR address", Text: s}
}
m := CIDRMask(n, 8*iplen)
return ip, &IPNet{IP: ip.Mask(m), Mask: m}, nil
}

41
src/net/iprawsock.go
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// The following is copied from Go 1.16 official implementation.
// Copyright 2010 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 net
// IPAddr represents the address of an IP end point.
type IPAddr struct {
IP IP
Zone string // IPv6 scoped addressing zone
}
// Network returns the address's network name, "ip".
func (a *IPAddr) Network() string { return "ip" }
func (a *IPAddr) String() string {
if a == nil {
return "<nil>"
}
ip := ipEmptyString(a.IP)
if a.Zone != "" {
return ip + "%" + a.Zone
}
return ip
}
func (a *IPAddr) isWildcard() bool {
if a == nil || a.IP == nil {
return true
}
return a.IP.IsUnspecified()
}
func (a *IPAddr) opAddr() Addr {
if a == nil {
return nil
}
return a
}

98
src/net/ipsock.go
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@ -1,98 +0,0 @@
// The following is copied from Go 1.16 official implementation.
// Copyright 2009 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 net
import "internal/bytealg"
// SplitHostPort splits a network address of the form "host:port",
// "host%zone:port", "[host]:port" or "[host%zone]:port" into host or
// host%zone and port.
//
// A literal IPv6 address in hostport must be enclosed in square
// brackets, as in "[::1]:80", "[::1%lo0]:80".
//
// See func Dial for a description of the hostport parameter, and host
// and port results.
func SplitHostPort(hostport string) (host, port string, err error) {
const (
missingPort = "missing port in address"
tooManyColons = "too many colons in address"
)
addrErr := func(addr, why string) (host, port string, err error) {
return "", "", &AddrError{Err: why, Addr: addr}
}
j, k := 0, 0
// The port starts after the last colon.
i := last(hostport, ':')
if i < 0 {
return addrErr(hostport, missingPort)
}
if hostport[0] == '[' {
// Expect the first ']' just before the last ':'.
end := bytealg.IndexByteString(hostport, ']')
if end < 0 {
return addrErr(hostport, "missing ']' in address")
}
switch end + 1 {
case len(hostport):
// There can't be a ':' behind the ']' now.
return addrErr(hostport, missingPort)
case i:
// The expected result.
default:
// Either ']' isn't followed by a colon, or it is
// followed by a colon that is not the last one.
if hostport[end+1] == ':' {
return addrErr(hostport, tooManyColons)
}
return addrErr(hostport, missingPort)
}
host = hostport[1:end]
j, k = 1, end+1 // there can't be a '[' resp. ']' before these positions
} else {
host = hostport[:i]
if bytealg.IndexByteString(host, ':') >= 0 {
return addrErr(hostport, tooManyColons)
}
}
if bytealg.IndexByteString(hostport[j:], '[') >= 0 {
return addrErr(hostport, "unexpected '[' in address")
}
if bytealg.IndexByteString(hostport[k:], ']') >= 0 {
return addrErr(hostport, "unexpected ']' in address")
}
port = hostport[i+1:]
return host, port, nil
}
func splitHostZone(s string) (host, zone string) {
// The IPv6 scoped addressing zone identifier starts after the
// last percent sign.
if i := last(s, '%'); i > 0 {
host, zone = s[:i], s[i+1:]
} else {
host = s
}
return
}
// JoinHostPort combines host and port into a network address of the
// form "host:port". If host contains a colon, as found in literal
// IPv6 addresses, then JoinHostPort returns "[host]:port".
//
// See func Dial for a description of the host and port parameters.
func JoinHostPort(host, port string) string {
// We assume that host is a literal IPv6 address if host has
// colons.
if bytealg.IndexByteString(host, ':') >= 0 {
return "[" + host + "]:" + port
}
return host + ":" + port
}

88
src/net/mac.go
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@ -1,88 +0,0 @@
// The following is copied from Go 1.16 official implementation.
// 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 net
const hexDigit = "0123456789abcdef"
// A HardwareAddr represents a physical hardware address.
type HardwareAddr []byte
func (a HardwareAddr) String() string {
if len(a) == 0 {
return ""
}
buf := make([]byte, 0, len(a)*3-1)
for i, b := range a {
if i > 0 {
buf = append(buf, ':')
}
buf = append(buf, hexDigit[b>>4])
buf = append(buf, hexDigit[b&0xF])
}
return string(buf)
}
// ParseMAC parses s as an IEEE 802 MAC-48, EUI-48, EUI-64, or a 20-octet
// IP over InfiniBand link-layer address using one of the following formats:
//
// 00:00:5e:00:53:01
// 02:00:5e:10:00:00:00:01
// 00:00:00:00:fe:80:00:00:00:00:00:00:02:00:5e:10:00:00:00:01
// 00-00-5e-00-53-01
// 02-00-5e-10-00-00-00-01
// 00-00-00-00-fe-80-00-00-00-00-00-00-02-00-5e-10-00-00-00-01
// 0000.5e00.5301
// 0200.5e10.0000.0001
// 0000.0000.fe80.0000.0000.0000.0200.5e10.0000.0001
func ParseMAC(s string) (hw HardwareAddr, err error) {
if len(s) < 14 {
goto err
}
if s[2] == ':' || s[2] == '-' {
if (len(s)+1)%3 != 0 {
goto err
}
n := (len(s) + 1) / 3
if n != 6 && n != 8 && n != 20 {
goto err
}
hw = make(HardwareAddr, n)
for x, i := 0, 0; i < n; i++ {
var ok bool
if hw[i], ok = xtoi2(s[x:], s[2]); !ok {
goto err
}
x += 3
}
} else if s[4] == '.' {
if (len(s)+1)%5 != 0 {
goto err
}
n := 2 * (len(s) + 1) / 5
if n != 6 && n != 8 && n != 20 {
goto err
}
hw = make(HardwareAddr, n)
for x, i := 0, 0; i < n; i += 2 {
var ok bool
if hw[i], ok = xtoi2(s[x:x+2], 0); !ok {
goto err
}
if hw[i+1], ok = xtoi2(s[x+2:], s[4]); !ok {
goto err
}
x += 5
}
} else {
goto err
}
return hw, nil
err:
return nil, &AddrError{Err: "invalid MAC address", Addr: s}
}

279
src/net/net.go
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@ -1,279 +0,0 @@
// The following is copied from Go 1.18 official implementation.
// Copyright 2009 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 net
import (
"io"
"time"
)
// Addr represents a network end point address.
//
// The two methods Network and String conventionally return strings
// that can be passed as the arguments to Dial, but the exact form
// and meaning of the strings is up to the implementation.
type Addr interface {
Network() string // name of the network (for example, "tcp", "udp")
String() string // string form of address (for example, "192.0.2.1:25", "[2001:db8::1]:80")
}
// Conn is a generic stream-oriented network connection.
//
// Multiple goroutines may invoke methods on a Conn simultaneously.
type Conn interface {
// Read reads data from the connection.
// Read can be made to time out and return an error after a fixed
// time limit; see SetDeadline and SetReadDeadline.
Read(b []byte) (n int, err error)
// Write writes data to the connection.
// Write can be made to time out and return an error after a fixed
// time limit; see SetDeadline and SetWriteDeadline.
Write(b []byte) (n int, err error)
// Close closes the connection.
// Any blocked Read or Write operations will be unblocked and return errors.
Close() error
// LocalAddr returns the local network address, if known.
LocalAddr() Addr
// RemoteAddr returns the remote network address, if known.
RemoteAddr() Addr
// SetDeadline sets the read and write deadlines associated
// with the connection. It is equivalent to calling both
// SetReadDeadline and SetWriteDeadline.
//
// A deadline is an absolute time after which I/O operations
// fail instead of blocking. The deadline applies to all future
// and pending I/O, not just the immediately following call to
// Read or Write. After a deadline has been exceeded, the
// connection can be refreshed by setting a deadline in the future.
//
// If the deadline is exceeded a call to Read or Write or to other
// I/O methods will return an error that wraps os.ErrDeadlineExceeded.
// This can be tested using errors.Is(err, os.ErrDeadlineExceeded).
// The error's Timeout method will return true, but note that there
// are other possible errors for which the Timeout method will
// return true even if the deadline has not been exceeded.
//
// An idle timeout can be implemented by repeatedly extending
// the deadline after successful Read or Write calls.
//
// A zero value for t means I/O operations will not time out.
SetDeadline(t time.Time) error
// SetReadDeadline sets the deadline for future Read calls
// and any currently-blocked Read call.
// A zero value for t means Read will not time out.
SetReadDeadline(t time.Time) error
// SetWriteDeadline sets the deadline for future Write calls
// and any currently-blocked Write call.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// A zero value for t means Write will not time out.
SetWriteDeadline(t time.Time) error
}
type conn struct {
//
}
// A Listener is a generic network listener for stream-oriented protocols.
//
// Multiple goroutines may invoke methods on a Listener simultaneously.
type Listener interface {
// Accept waits for and returns the next connection to the listener.
Accept() (Conn, error)
// Close closes the listener.
// Any blocked Accept operations will be unblocked and return errors.
Close() error
// Addr returns the listener's network address.
Addr() Addr
}
// An Error represents a network error.
type Error interface {
error
Timeout() bool // Is the error a timeout?
// Deprecated: Temporary errors are not well-defined.
// Most "temporary" errors are timeouts, and the few exceptions are surprising.
// Do not use this method.
Temporary() bool
}
// OpError is the error type usually returned by functions in the net
// package. It describes the operation, network type, and address of
// an error.
type OpError struct {
// Op is the operation which caused the error, such as
// "read" or "write".
Op string
// Net is the network type on which this error occurred,
// such as "tcp" or "udp6".
Net string
// For operations involving a remote network connection, like
// Dial, Read, or Write, Source is the corresponding local
// network address.
Source Addr
// Addr is the network address for which this error occurred.
// For local operations, like Listen or SetDeadline, Addr is
// the address of the local endpoint being manipulated.
// For operations involving a remote network connection, like
// Dial, Read, or Write, Addr is the remote address of that
// connection.
Addr Addr
// Err is the error that occurred during the operation.
// The Error method panics if the error is nil.
Err error
}
func (e *OpError) Unwrap() error { return e.Err }
func (e *OpError) Error() string {
if e == nil {
return "<nil>"
}
s := e.Op
if e.Net != "" {
s += " " + e.Net
}
if e.Source != nil {
s += " " + e.Source.String()
}
if e.Addr != nil {
if e.Source != nil {
s += "->"
} else {
s += " "
}
s += e.Addr.String()
}
s += ": " + e.Err.Error()
return s
}
// A ParseError is the error type of literal network address parsers.
type ParseError struct {
// Type is the type of string that was expected, such as
// "IP address", "CIDR address".
Type string
// Text is the malformed text string.
Text string
}
func (e *ParseError) Error() string { return "invalid " + e.Type + ": " + e.Text }
type AddrError struct {
Err string
Addr string
}
func (e *AddrError) Error() string {
if e == nil {
return "<nil>"
}
s := e.Err
if e.Addr != "" {
s = "address " + e.Addr + ": " + s
}
return s
}
func (e *AddrError) Timeout() bool { return false }
func (e *AddrError) Temporary() bool { return false }
// ErrClosed is the error returned by an I/O call on a network
// connection that has already been closed, or that is closed by
// another goroutine before the I/O is completed. This may be wrapped
// in another error, and should normally be tested using
// errors.Is(err, net.ErrClosed).
var ErrClosed = errClosed
// buffersWriter is the interface implemented by Conns that support a
// "writev"-like batch write optimization.
// writeBuffers should fully consume and write all chunks from the
// provided Buffers, else it should report a non-nil error.
type buffersWriter interface {
writeBuffers(*Buffers) (int64, error)
}
// Buffers contains zero or more runs of bytes to write.
//
// On certain machines, for certain types of connections, this is
// optimized into an OS-specific batch write operation (such as
// "writev").
type Buffers [][]byte
var (
_ io.WriterTo = (*Buffers)(nil)
_ io.Reader = (*Buffers)(nil)
)
// WriteTo writes contents of the buffers to w.
//
// WriteTo implements io.WriterTo for Buffers.
//
// WriteTo modifies the slice v as well as v[i] for 0 <= i < len(v),
// but does not modify v[i][j] for any i, j.
func (v *Buffers) WriteTo(w io.Writer) (n int64, err error) {
if wv, ok := w.(buffersWriter); ok {
return wv.writeBuffers(v)
}
for _, b := range *v {
nb, err := w.Write(b)
n += int64(nb)
if err != nil {
v.consume(n)
return n, err
}
}
v.consume(n)
return n, nil
}
// Read from the buffers.
//
// Read implements io.Reader for Buffers.
//
// Read modifies the slice v as well as v[i] for 0 <= i < len(v),
// but does not modify v[i][j] for any i, j.
func (v *Buffers) Read(p []byte) (n int, err error) {
for len(p) > 0 && len(*v) > 0 {
n0 := copy(p, (*v)[0])
v.consume(int64(n0))
p = p[n0:]
n += n0
}
if len(*v) == 0 {
err = io.EOF
}
return
}
func (v *Buffers) consume(n int64) {
for len(*v) > 0 {
ln0 := int64(len((*v)[0]))
if ln0 > n {
(*v)[0] = (*v)[0][n:]
return
}
n -= ln0
(*v)[0] = nil
*v = (*v)[1:]
}
}

90
src/net/parse.go
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@ -1,90 +0,0 @@
// The following is copied from Go 1.16 official implementation.
// Copyright 2009 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 net
// Bigger than we need, not too big to worry about overflow
const big = 0xFFFFFF
// Decimal to integer.
// Returns number, characters consumed, success.
func dtoi(s string) (n int, i int, ok bool) {
n = 0
for i = 0; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ {
n = n*10 + int(s[i]-'0')
if n >= big {
return big, i, false
}
}
if i == 0 {
return 0, 0, false
}
return n, i, true
}
// Hexadecimal to integer.
// Returns number, characters consumed, success.
func xtoi(s string) (n int, i int, ok bool) {
n = 0
for i = 0; i < len(s); i++ {
if '0' <= s[i] && s[i] <= '9' {
n *= 16
n += int(s[i] - '0')
} else if 'a' <= s[i] && s[i] <= 'f' {
n *= 16
n += int(s[i]-'a') + 10
} else if 'A' <= s[i] && s[i] <= 'F' {
n *= 16
n += int(s[i]-'A') + 10
} else {
break
}
if n >= big {
return 0, i, false
}
}
if i == 0 {
return 0, i, false
}
return n, i, true
}
// xtoi2 converts the next two hex digits of s into a byte.
// If s is longer than 2 bytes then the third byte must be e.
// If the first two bytes of s are not hex digits or the third byte
// does not match e, false is returned.
func xtoi2(s string, e byte) (byte, bool) {
if len(s) > 2 && s[2] != e {
return 0, false
}
n, ei, ok := xtoi(s[:2])
return byte(n), ok && ei == 2
}
// Convert i to a hexadecimal string. Leading zeros are not printed.
func appendHex(dst []byte, i uint32) []byte {
if i == 0 {
return append(dst, '0')
}
for j := 7; j >= 0; j-- {
v := i >> uint(j*4)
if v > 0 {
dst = append(dst, hexDigit[v&0xf])
}
}
return dst
}
// Index of rightmost occurrence of b in s.
func last(s string, b byte) int {
i := len(s)
for i--; i >= 0; i-- {
if s[i] == b {
break
}
}
return i
}

240
src/net/pipe.go
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@ -1,240 +0,0 @@
// The following is copied from Go 1.19.2 official implementation.
// Copyright 2010 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 net
import (
"io"
"os"
"sync"
"time"
)
// pipeDeadline is an abstraction for handling timeouts.
type pipeDeadline struct {
mu sync.Mutex // Guards timer and cancel
timer *time.Timer
cancel chan struct{} // Must be non-nil
}
func makePipeDeadline() pipeDeadline {
return pipeDeadline{cancel: make(chan struct{})}
}
// set sets the point in time when the deadline will time out.
// A timeout event is signaled by closing the channel returned by waiter.
// Once a timeout has occurred, the deadline can be refreshed by specifying a
// t value in the future.
//
// A zero value for t prevents timeout.
func (d *pipeDeadline) set(t time.Time) {
d.mu.Lock()
defer d.mu.Unlock()
if d.timer != nil && !d.timer.Stop() {
<-d.cancel // Wait for the timer callback to finish and close cancel
}
d.timer = nil
// Time is zero, then there is no deadline.
closed := isClosedChan(d.cancel)
if t.IsZero() {
if closed {
d.cancel = make(chan struct{})
}
return
}
// Time in the future, setup a timer to cancel in the future.
if dur := time.Until(t); dur > 0 {
if closed {
d.cancel = make(chan struct{})
}
d.timer = time.AfterFunc(dur, func() {
close(d.cancel)
})
return
}
// Time in the past, so close immediately.
if !closed {
close(d.cancel)
}
}
// wait returns a channel that is closed when the deadline is exceeded.
func (d *pipeDeadline) wait() chan struct{} {
d.mu.Lock()
defer d.mu.Unlock()
return d.cancel
}
func isClosedChan(c <-chan struct{}) bool {
select {
case <-c:
return true
default:
return false
}
}
type pipeAddr struct{}
func (pipeAddr) Network() string { return "pipe" }
func (pipeAddr) String() string { return "pipe" }
type pipe struct {
wrMu sync.Mutex // Serialize Write operations
// Used by local Read to interact with remote Write.
// Successful receive on rdRx is always followed by send on rdTx.
rdRx <-chan []byte
rdTx chan<- int
// Used by local Write to interact with remote Read.
// Successful send on wrTx is always followed by receive on wrRx.
wrTx chan<- []byte
wrRx <-chan int
once sync.Once // Protects closing localDone
localDone chan struct{}
remoteDone <-chan struct{}
readDeadline pipeDeadline
writeDeadline pipeDeadline
}
// Pipe creates a synchronous, in-memory, full duplex
// network connection; both ends implement the Conn interface.
// Reads on one end are matched with writes on the other,
// copying data directly between the two; there is no internal
// buffering.
func Pipe() (Conn, Conn) {
cb1 := make(chan []byte)
cb2 := make(chan []byte)
cn1 := make(chan int)
cn2 := make(chan int)
done1 := make(chan struct{})
done2 := make(chan struct{})
p1 := &pipe{
rdRx: cb1, rdTx: cn1,
wrTx: cb2, wrRx: cn2,
localDone: done1, remoteDone: done2,
readDeadline: makePipeDeadline(),
writeDeadline: makePipeDeadline(),
}
p2 := &pipe{
rdRx: cb2, rdTx: cn2,
wrTx: cb1, wrRx: cn1,
localDone: done2, remoteDone: done1,
readDeadline: makePipeDeadline(),
writeDeadline: makePipeDeadline(),
}
return p1, p2
}
func (*pipe) LocalAddr() Addr { return pipeAddr{} }
func (*pipe) RemoteAddr() Addr { return pipeAddr{} }
func (p *pipe) Read(b []byte) (int, error) {
n, err := p.read(b)
if err != nil && err != io.EOF && err != io.ErrClosedPipe {
err = &OpError{Op: "read", Net: "pipe", Err: err}
}
return n, err
}
func (p *pipe) read(b []byte) (n int, err error) {
switch {
case isClosedChan(p.localDone):
return 0, io.ErrClosedPipe
case isClosedChan(p.remoteDone):
return 0, io.EOF
case isClosedChan(p.readDeadline.wait()):
return 0, os.ErrDeadlineExceeded
}
select {
case bw := <-p.rdRx:
nr := copy(b, bw)
p.rdTx <- nr
return nr, nil
case <-p.localDone:
return 0, io.ErrClosedPipe
case <-p.remoteDone:
return 0, io.EOF
case <-p.readDeadline.wait():
return 0, os.ErrDeadlineExceeded
}
}
func (p *pipe) Write(b []byte) (int, error) {
n, err := p.write(b)
if err != nil && err != io.ErrClosedPipe {
err = &OpError{Op: "write", Net: "pipe", Err: err}
}
return n, err
}
func (p *pipe) write(b []byte) (n int, err error) {
switch {
case isClosedChan(p.localDone):
return 0, io.ErrClosedPipe
case isClosedChan(p.remoteDone):
return 0, io.ErrClosedPipe
case isClosedChan(p.writeDeadline.wait()):
return 0, os.ErrDeadlineExceeded
}
p.wrMu.Lock() // Ensure entirety of b is written together
defer p.wrMu.Unlock()
for once := true; once || len(b) > 0; once = false {
select {
case p.wrTx <- b:
nw := <-p.wrRx
b = b[nw:]
n += nw
case <-p.localDone:
return n, io.ErrClosedPipe
case <-p.remoteDone:
return n, io.ErrClosedPipe
case <-p.writeDeadline.wait():
return n, os.ErrDeadlineExceeded
}
}
return n, nil
}
func (p *pipe) SetDeadline(t time.Time) error {
if isClosedChan(p.localDone) || isClosedChan(p.remoteDone) {
return io.ErrClosedPipe
}
p.readDeadline.set(t)
p.writeDeadline.set(t)
return nil
}
func (p *pipe) SetReadDeadline(t time.Time) error {
if isClosedChan(p.localDone) || isClosedChan(p.remoteDone) {
return io.ErrClosedPipe
}
p.readDeadline.set(t)
return nil
}
func (p *pipe) SetWriteDeadline(t time.Time) error {
if isClosedChan(p.localDone) || isClosedChan(p.remoteDone) {
return io.ErrClosedPipe
}
p.writeDeadline.set(t)
return nil
}
func (p *pipe) Close() error {
p.once.Do(func() { close(p.localDone) })
return nil
}

48
src/net/pipe_test.go
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@ -1,48 +0,0 @@
// The following is copied from Go 1.19.2 official implementation.
// Copyright 2010 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 net
import (
"io"
"testing"
"time"
)
func TestPipe(t *testing.T) {
testConn(t, func() (c1, c2 Conn, stop func(), err error) {
c1, c2 = Pipe()
stop = func() {
c1.Close()
c2.Close()
}
return
})
}
func TestPipeCloseError(t *testing.T) {
c1, c2 := Pipe()
c1.Close()
if _, err := c1.Read(nil); err != io.ErrClosedPipe {
t.Errorf("c1.Read() = %v, want io.ErrClosedPipe", err)
}
if _, err := c1.Write(nil); err != io.ErrClosedPipe {
t.Errorf("c1.Write() = %v, want io.ErrClosedPipe", err)
}
if err := c1.SetDeadline(time.Time{}); err != io.ErrClosedPipe {
t.Errorf("c1.SetDeadline() = %v, want io.ErrClosedPipe", err)
}
if _, err := c2.Read(nil); err != io.EOF {
t.Errorf("c2.Read() = %v, want io.EOF", err)
}
if _, err := c2.Write(nil); err != io.ErrClosedPipe {
t.Errorf("c2.Write() = %v, want io.ErrClosedPipe", err)
}
if err := c2.SetDeadline(time.Time{}); err != io.ErrClosedPipe {
t.Errorf("c2.SetDeadline() = %v, want io.ErrClosedPipe", err)
}
}

65
src/net/tcpsock.go
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@ -1,65 +0,0 @@
package net
import (
"internal/itoa"
"net/netip"
)
// TCPAddr represents the address of a TCP end point.
type TCPAddr struct {
IP IP
Port int
Zone string // IPv6 scoped addressing zone
}
// AddrPort returns the TCPAddr a as a netip.AddrPort.
//
// If a.Port does not fit in a uint16, it's silently truncated.
//
// If a is nil, a zero value is returned.
func (a *TCPAddr) AddrPort() netip.AddrPort {
if a == nil {
return netip.AddrPort{}
}
na, _ := netip.AddrFromSlice(a.IP)
na = na.WithZone(a.Zone)
return netip.AddrPortFrom(na, uint16(a.Port))
}
// Network returns the address's network name, "tcp".
func (a *TCPAddr) Network() string { return "tcp" }
func (a *TCPAddr) String() string {
if a == nil {
return "<nil>"
}
ip := ipEmptyString(a.IP)
if a.Zone != "" {
return JoinHostPort(ip+"%"+a.Zone, itoa.Itoa(a.Port))
}
return JoinHostPort(ip, itoa.Itoa(a.Port))
}
func (a *TCPAddr) isWildcard() bool {
if a == nil || a.IP == nil {
return true
}
return a.IP.IsUnspecified()
}
func (a *TCPAddr) opAddr() Addr {
if a == nil {
return nil
}
return a
}
// TCPConn is an implementation of the Conn interface for TCP network
// connections.
type TCPConn struct {
conn
}
func (c *TCPConn) CloseWrite() error {
return &OpError{"close", "", nil, nil, ErrNotImplemented}
}

55
src/net/udpsock.go
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@ -1,55 +0,0 @@
package net
import (
"internal/itoa"
"net/netip"
)
// UDPAddr represents the address of a UDP end point.
type UDPAddr struct {
IP IP
Port int
Zone string // IPv6 scoped addressing zone
}
// AddrPort returns the UDPAddr a as a netip.AddrPort.
//
// If a.Port does not fit in a uint16, it's silently truncated.
//
// If a is nil, a zero value is returned.
func (a *UDPAddr) AddrPort() netip.AddrPort {
if a == nil {
return netip.AddrPort{}
}
na, _ := netip.AddrFromSlice(a.IP)
na = na.WithZone(a.Zone)
return netip.AddrPortFrom(na, uint16(a.Port))
}
// Network returns the address's network name, "udp".
func (a *UDPAddr) Network() string { return "udp" }
func (a *UDPAddr) String() string {
if a == nil {
return "<nil>"
}
ip := ipEmptyString(a.IP)
if a.Zone != "" {
return JoinHostPort(ip+"%"+a.Zone, itoa.Itoa(a.Port))
}
return JoinHostPort(ip, itoa.Itoa(a.Port))
}
func (a *UDPAddr) isWildcard() bool {
if a == nil || a.IP == nil {
return true
}
return a.IP.IsUnspecified()
}
func (a *UDPAddr) opAddr() Addr {
if a == nil {
return nil
}
return a
}

132
src/net/writev_test.go
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@ -1,132 +0,0 @@
// The following is copied from Go 1.17 official implementation and
// modified to accommodate TinyGo.
// Copyright 2016 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 net
import (
"bytes"
"fmt"
"io"
"reflect"
"testing"
)
func TestBuffers_read(t *testing.T) {
const story = "once upon a time in Gopherland ... "
buffers := Buffers{
[]byte("once "),
[]byte("upon "),
[]byte("a "),
[]byte("time "),
[]byte("in "),
[]byte("Gopherland ... "),
}
got, err := io.ReadAll(&buffers)
if err != nil {
t.Fatal(err)
}
if string(got) != story {
t.Errorf("read %q; want %q", got, story)
}
if len(buffers) != 0 {
t.Errorf("len(buffers) = %d; want 0", len(buffers))
}
}
func TestBuffers_consume(t *testing.T) {
tests := []struct {
in Buffers
consume int64
want Buffers
}{
{
in: Buffers{[]byte("foo"), []byte("bar")},
consume: 0,
want: Buffers{[]byte("foo"), []byte("bar")},
},
{
in: Buffers{[]byte("foo"), []byte("bar")},
consume: 2,
want: Buffers{[]byte("o"), []byte("bar")},
},
{
in: Buffers{[]byte("foo"), []byte("bar")},
consume: 3,
want: Buffers{[]byte("bar")},
},
{
in: Buffers{[]byte("foo"), []byte("bar")},
consume: 4,
want: Buffers{[]byte("ar")},
},
{
in: Buffers{nil, nil, nil, []byte("bar")},
consume: 1,
want: Buffers{[]byte("ar")},
},
{
in: Buffers{nil, nil, nil, []byte("foo")},
consume: 0,
want: Buffers{[]byte("foo")},
},
{
in: Buffers{nil, nil, nil},
consume: 0,
want: Buffers{},
},
}
for i, tt := range tests {
in := tt.in
in.consume(tt.consume)
if !reflect.DeepEqual(in, tt.want) {
t.Errorf("%d. after consume(%d) = %+v, want %+v", i, tt.consume, in, tt.want)
}
}
}
func TestBuffers_WriteTo(t *testing.T) {
for _, name := range []string{"WriteTo", "Copy"} {
for _, size := range []int{0, 10, 1023, 1024, 1025} {
t.Run(fmt.Sprintf("%s/%d", name, size), func(t *testing.T) {
testBuffer_writeTo(t, size, name == "Copy")
})
}
}
}
func testBuffer_writeTo(t *testing.T, chunks int, useCopy bool) {
var want bytes.Buffer
for i := 0; i < chunks; i++ {
want.WriteByte(byte(i))
}
var b bytes.Buffer
buffers := make(Buffers, chunks)
for i := range buffers {
buffers[i] = want.Bytes()[i : i+1]
}
var n int64
var err error
if useCopy {
n, err = io.Copy(&b, &buffers)
} else {
n, err = buffers.WriteTo(&b)
}
if err != nil {
t.Fatal(err)
}
if len(buffers) != 0 {
t.Fatal(fmt.Errorf("len(buffers) = %d; want 0", len(buffers)))
}
if n != int64(want.Len()) {
t.Fatal(fmt.Errorf("Buffers.WriteTo returned %d; want %d", n, want.Len()))
}
all, err := io.ReadAll(&b)
if !bytes.Equal(all, want.Bytes()) || err != nil {
t.Fatal(fmt.Errorf("read %q, %v; want %q, nil", all, err, want.Bytes()))
}
}