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-rw-r--r--src/encoding/base64/base64.go391
-rw-r--r--src/encoding/base64/base64_test.go360
-rw-r--r--src/encoding/base64/example_test.go45
3 files changed, 796 insertions, 0 deletions
diff --git a/src/encoding/base64/base64.go b/src/encoding/base64/base64.go
new file mode 100644
index 000000000..ad3abe662
--- /dev/null
+++ b/src/encoding/base64/base64.go
@@ -0,0 +1,391 @@
+// 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 base64 implements base64 encoding as specified by RFC 4648.
+package base64
+
+import (
+ "bytes"
+ "io"
+ "strconv"
+ "strings"
+)
+
+/*
+ * Encodings
+ */
+
+// An Encoding is a radix 64 encoding/decoding scheme, defined by a
+// 64-character alphabet. The most common encoding is the "base64"
+// encoding defined in RFC 4648 and used in MIME (RFC 2045) and PEM
+// (RFC 1421). RFC 4648 also defines an alternate encoding, which is
+// the standard encoding with - and _ substituted for + and /.
+type Encoding struct {
+ encode string
+ decodeMap [256]byte
+}
+
+const encodeStd = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
+const encodeURL = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
+
+// NewEncoding returns a new Encoding defined by the given alphabet,
+// which must be a 64-byte string.
+func NewEncoding(encoder string) *Encoding {
+ e := new(Encoding)
+ e.encode = encoder
+ for i := 0; i < len(e.decodeMap); i++ {
+ e.decodeMap[i] = 0xFF
+ }
+ for i := 0; i < len(encoder); i++ {
+ e.decodeMap[encoder[i]] = byte(i)
+ }
+ return e
+}
+
+// StdEncoding is the standard base64 encoding, as defined in
+// RFC 4648.
+var StdEncoding = NewEncoding(encodeStd)
+
+// URLEncoding is the alternate base64 encoding defined in RFC 4648.
+// It is typically used in URLs and file names.
+var URLEncoding = NewEncoding(encodeURL)
+
+var removeNewlinesMapper = func(r rune) rune {
+ if r == '\r' || r == '\n' {
+ return -1
+ }
+ return r
+}
+
+/*
+ * Encoder
+ */
+
+// Encode encodes src using the encoding enc, writing
+// EncodedLen(len(src)) bytes to dst.
+//
+// The encoding pads the output to a multiple of 4 bytes,
+// so Encode is not appropriate for use on individual blocks
+// of a large data stream. Use NewEncoder() instead.
+func (enc *Encoding) Encode(dst, src []byte) {
+ if len(src) == 0 {
+ return
+ }
+
+ for len(src) > 0 {
+ var b0, b1, b2, b3 byte
+
+ // Unpack 4x 6-bit source blocks into a 4 byte
+ // destination quantum
+ switch len(src) {
+ default:
+ b3 = src[2] & 0x3F
+ b2 = src[2] >> 6
+ fallthrough
+ case 2:
+ b2 |= (src[1] << 2) & 0x3F
+ b1 = src[1] >> 4
+ fallthrough
+ case 1:
+ b1 |= (src[0] << 4) & 0x3F
+ b0 = src[0] >> 2
+ }
+
+ // Encode 6-bit blocks using the base64 alphabet
+ dst[0] = enc.encode[b0]
+ dst[1] = enc.encode[b1]
+ dst[2] = enc.encode[b2]
+ dst[3] = enc.encode[b3]
+
+ // Pad the final quantum
+ if len(src) < 3 {
+ dst[3] = '='
+ if len(src) < 2 {
+ dst[2] = '='
+ }
+ break
+ }
+
+ src = src[3:]
+ dst = dst[4:]
+ }
+}
+
+// EncodeToString returns the base64 encoding of src.
+func (enc *Encoding) EncodeToString(src []byte) string {
+ buf := make([]byte, enc.EncodedLen(len(src)))
+ enc.Encode(buf, src)
+ return string(buf)
+}
+
+type encoder struct {
+ err error
+ enc *Encoding
+ w io.Writer
+ buf [3]byte // buffered data waiting to be encoded
+ nbuf int // number of bytes in buf
+ out [1024]byte // output buffer
+}
+
+func (e *encoder) Write(p []byte) (n int, err error) {
+ if e.err != nil {
+ return 0, e.err
+ }
+
+ // Leading fringe.
+ if e.nbuf > 0 {
+ var i int
+ for i = 0; i < len(p) && e.nbuf < 3; i++ {
+ e.buf[e.nbuf] = p[i]
+ e.nbuf++
+ }
+ n += i
+ p = p[i:]
+ if e.nbuf < 3 {
+ return
+ }
+ e.enc.Encode(e.out[0:], e.buf[0:])
+ if _, e.err = e.w.Write(e.out[0:4]); e.err != nil {
+ return n, e.err
+ }
+ e.nbuf = 0
+ }
+
+ // Large interior chunks.
+ for len(p) >= 3 {
+ nn := len(e.out) / 4 * 3
+ if nn > len(p) {
+ nn = len(p)
+ nn -= nn % 3
+ }
+ e.enc.Encode(e.out[0:], p[0:nn])
+ if _, e.err = e.w.Write(e.out[0 : nn/3*4]); e.err != nil {
+ return n, e.err
+ }
+ n += nn
+ p = p[nn:]
+ }
+
+ // Trailing fringe.
+ for i := 0; i < len(p); i++ {
+ e.buf[i] = p[i]
+ }
+ e.nbuf = len(p)
+ n += len(p)
+ return
+}
+
+// Close flushes any pending output from the encoder.
+// It is an error to call Write after calling Close.
+func (e *encoder) Close() error {
+ // If there's anything left in the buffer, flush it out
+ if e.err == nil && e.nbuf > 0 {
+ e.enc.Encode(e.out[0:], e.buf[0:e.nbuf])
+ e.nbuf = 0
+ _, e.err = e.w.Write(e.out[0:4])
+ }
+ return e.err
+}
+
+// NewEncoder returns a new base64 stream encoder. Data written to
+// the returned writer will be encoded using enc and then written to w.
+// Base64 encodings operate in 4-byte blocks; when finished
+// writing, the caller must Close the returned encoder to flush any
+// partially written blocks.
+func NewEncoder(enc *Encoding, w io.Writer) io.WriteCloser {
+ return &encoder{enc: enc, w: w}
+}
+
+// EncodedLen returns the length in bytes of the base64 encoding
+// of an input buffer of length n.
+func (enc *Encoding) EncodedLen(n int) int { return (n + 2) / 3 * 4 }
+
+/*
+ * Decoder
+ */
+
+type CorruptInputError int64
+
+func (e CorruptInputError) Error() string {
+ return "illegal base64 data at input byte " + strconv.FormatInt(int64(e), 10)
+}
+
+// decode is like Decode but returns an additional 'end' value, which
+// indicates if end-of-message padding was encountered and thus any
+// additional data is an error. This method assumes that src has been
+// stripped of all supported whitespace ('\r' and '\n').
+func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
+ olen := len(src)
+ for len(src) > 0 && !end {
+ // Decode quantum using the base64 alphabet
+ var dbuf [4]byte
+ dlen := 4
+
+ for j := range dbuf {
+ if len(src) == 0 {
+ return n, false, CorruptInputError(olen - len(src) - j)
+ }
+ in := src[0]
+ src = src[1:]
+ if in == '=' {
+ // We've reached the end and there's padding
+ switch j {
+ case 0, 1:
+ // incorrect padding
+ return n, false, CorruptInputError(olen - len(src) - 1)
+ case 2:
+ // "==" is expected, the first "=" is already consumed.
+ if len(src) == 0 {
+ // not enough padding
+ return n, false, CorruptInputError(olen)
+ }
+ if src[0] != '=' {
+ // incorrect padding
+ return n, false, CorruptInputError(olen - len(src) - 1)
+ }
+ src = src[1:]
+ }
+ if len(src) > 0 {
+ // trailing garbage
+ err = CorruptInputError(olen - len(src))
+ }
+ dlen, end = j, true
+ break
+ }
+ dbuf[j] = enc.decodeMap[in]
+ if dbuf[j] == 0xFF {
+ return n, false, CorruptInputError(olen - len(src) - 1)
+ }
+ }
+
+ // Pack 4x 6-bit source blocks into 3 byte destination
+ // quantum
+ switch dlen {
+ case 4:
+ dst[2] = dbuf[2]<<6 | dbuf[3]
+ fallthrough
+ case 3:
+ dst[1] = dbuf[1]<<4 | dbuf[2]>>2
+ fallthrough
+ case 2:
+ dst[0] = dbuf[0]<<2 | dbuf[1]>>4
+ }
+ dst = dst[3:]
+ n += dlen - 1
+ }
+
+ return n, end, err
+}
+
+// Decode decodes src using the encoding enc. It writes at most
+// DecodedLen(len(src)) bytes to dst and returns the number of bytes
+// written. If src contains invalid base64 data, it will return the
+// number of bytes successfully written and CorruptInputError.
+// New line characters (\r and \n) are ignored.
+func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
+ src = bytes.Map(removeNewlinesMapper, src)
+ n, _, err = enc.decode(dst, src)
+ return
+}
+
+// DecodeString returns the bytes represented by the base64 string s.
+func (enc *Encoding) DecodeString(s string) ([]byte, error) {
+ s = strings.Map(removeNewlinesMapper, s)
+ dbuf := make([]byte, enc.DecodedLen(len(s)))
+ n, _, err := enc.decode(dbuf, []byte(s))
+ return dbuf[:n], err
+}
+
+type decoder struct {
+ err error
+ enc *Encoding
+ r io.Reader
+ end bool // saw end of message
+ buf [1024]byte // leftover input
+ nbuf int
+ out []byte // leftover decoded output
+ outbuf [1024 / 4 * 3]byte
+}
+
+func (d *decoder) Read(p []byte) (n int, err error) {
+ if d.err != nil {
+ return 0, d.err
+ }
+
+ // Use leftover decoded output from last read.
+ if len(d.out) > 0 {
+ n = copy(p, d.out)
+ d.out = d.out[n:]
+ return n, nil
+ }
+
+ // Read a chunk.
+ nn := len(p) / 3 * 4
+ if nn < 4 {
+ nn = 4
+ }
+ if nn > len(d.buf) {
+ nn = len(d.buf)
+ }
+ nn, d.err = io.ReadAtLeast(d.r, d.buf[d.nbuf:nn], 4-d.nbuf)
+ d.nbuf += nn
+ if d.err != nil || d.nbuf < 4 {
+ return 0, d.err
+ }
+
+ // Decode chunk into p, or d.out and then p if p is too small.
+ nr := d.nbuf / 4 * 4
+ nw := d.nbuf / 4 * 3
+ if nw > len(p) {
+ nw, d.end, d.err = d.enc.decode(d.outbuf[0:], d.buf[0:nr])
+ d.out = d.outbuf[0:nw]
+ n = copy(p, d.out)
+ d.out = d.out[n:]
+ } else {
+ n, d.end, d.err = d.enc.decode(p, d.buf[0:nr])
+ }
+ d.nbuf -= nr
+ for i := 0; i < d.nbuf; i++ {
+ d.buf[i] = d.buf[i+nr]
+ }
+
+ if d.err == nil {
+ d.err = err
+ }
+ return n, d.err
+}
+
+type newlineFilteringReader struct {
+ wrapped io.Reader
+}
+
+func (r *newlineFilteringReader) Read(p []byte) (int, error) {
+ n, err := r.wrapped.Read(p)
+ for n > 0 {
+ offset := 0
+ for i, b := range p[0:n] {
+ if b != '\r' && b != '\n' {
+ if i != offset {
+ p[offset] = b
+ }
+ offset++
+ }
+ }
+ if offset > 0 {
+ return offset, err
+ }
+ // Previous buffer entirely whitespace, read again
+ n, err = r.wrapped.Read(p)
+ }
+ return n, err
+}
+
+// NewDecoder constructs a new base64 stream decoder.
+func NewDecoder(enc *Encoding, r io.Reader) io.Reader {
+ return &decoder{enc: enc, r: &newlineFilteringReader{r}}
+}
+
+// DecodedLen returns the maximum length in bytes of the decoded data
+// corresponding to n bytes of base64-encoded data.
+func (enc *Encoding) DecodedLen(n int) int { return n / 4 * 3 }
diff --git a/src/encoding/base64/base64_test.go b/src/encoding/base64/base64_test.go
new file mode 100644
index 000000000..7d199bfa0
--- /dev/null
+++ b/src/encoding/base64/base64_test.go
@@ -0,0 +1,360 @@
+// 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 base64
+
+import (
+ "bytes"
+ "errors"
+ "io"
+ "io/ioutil"
+ "reflect"
+ "strings"
+ "testing"
+ "time"
+)
+
+type testpair struct {
+ decoded, encoded string
+}
+
+var pairs = []testpair{
+ // RFC 3548 examples
+ {"\x14\xfb\x9c\x03\xd9\x7e", "FPucA9l+"},
+ {"\x14\xfb\x9c\x03\xd9", "FPucA9k="},
+ {"\x14\xfb\x9c\x03", "FPucAw=="},
+
+ // RFC 4648 examples
+ {"", ""},
+ {"f", "Zg=="},
+ {"fo", "Zm8="},
+ {"foo", "Zm9v"},
+ {"foob", "Zm9vYg=="},
+ {"fooba", "Zm9vYmE="},
+ {"foobar", "Zm9vYmFy"},
+
+ // Wikipedia examples
+ {"sure.", "c3VyZS4="},
+ {"sure", "c3VyZQ=="},
+ {"sur", "c3Vy"},
+ {"su", "c3U="},
+ {"leasure.", "bGVhc3VyZS4="},
+ {"easure.", "ZWFzdXJlLg=="},
+ {"asure.", "YXN1cmUu"},
+ {"sure.", "c3VyZS4="},
+}
+
+var bigtest = testpair{
+ "Twas brillig, and the slithy toves",
+ "VHdhcyBicmlsbGlnLCBhbmQgdGhlIHNsaXRoeSB0b3Zlcw==",
+}
+
+func testEqual(t *testing.T, msg string, args ...interface{}) bool {
+ if args[len(args)-2] != args[len(args)-1] {
+ t.Errorf(msg, args...)
+ return false
+ }
+ return true
+}
+
+func TestEncode(t *testing.T) {
+ for _, p := range pairs {
+ got := StdEncoding.EncodeToString([]byte(p.decoded))
+ testEqual(t, "Encode(%q) = %q, want %q", p.decoded, got, p.encoded)
+ }
+}
+
+func TestEncoder(t *testing.T) {
+ for _, p := range pairs {
+ bb := &bytes.Buffer{}
+ encoder := NewEncoder(StdEncoding, bb)
+ encoder.Write([]byte(p.decoded))
+ encoder.Close()
+ testEqual(t, "Encode(%q) = %q, want %q", p.decoded, bb.String(), p.encoded)
+ }
+}
+
+func TestEncoderBuffering(t *testing.T) {
+ input := []byte(bigtest.decoded)
+ for bs := 1; bs <= 12; bs++ {
+ bb := &bytes.Buffer{}
+ encoder := NewEncoder(StdEncoding, bb)
+ for pos := 0; pos < len(input); pos += bs {
+ end := pos + bs
+ if end > len(input) {
+ end = len(input)
+ }
+ n, err := encoder.Write(input[pos:end])
+ testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, error(nil))
+ testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
+ }
+ err := encoder.Close()
+ testEqual(t, "Close gave error %v, want %v", err, error(nil))
+ testEqual(t, "Encoding/%d of %q = %q, want %q", bs, bigtest.decoded, bb.String(), bigtest.encoded)
+ }
+}
+
+func TestDecode(t *testing.T) {
+ for _, p := range pairs {
+ dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
+ count, end, err := StdEncoding.decode(dbuf, []byte(p.encoded))
+ testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
+ testEqual(t, "Decode(%q) = length %v, want %v", p.encoded, count, len(p.decoded))
+ if len(p.encoded) > 0 {
+ testEqual(t, "Decode(%q) = end %v, want %v", p.encoded, end, (p.encoded[len(p.encoded)-1] == '='))
+ }
+ testEqual(t, "Decode(%q) = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded)
+
+ dbuf, err = StdEncoding.DecodeString(p.encoded)
+ testEqual(t, "DecodeString(%q) = error %v, want %v", p.encoded, err, error(nil))
+ testEqual(t, "DecodeString(%q) = %q, want %q", string(dbuf), p.decoded)
+ }
+}
+
+func TestDecoder(t *testing.T) {
+ for _, p := range pairs {
+ decoder := NewDecoder(StdEncoding, strings.NewReader(p.encoded))
+ dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
+ count, err := decoder.Read(dbuf)
+ if err != nil && err != io.EOF {
+ t.Fatal("Read failed", err)
+ }
+ testEqual(t, "Read from %q = length %v, want %v", p.encoded, count, len(p.decoded))
+ testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded)
+ if err != io.EOF {
+ count, err = decoder.Read(dbuf)
+ }
+ testEqual(t, "Read from %q = %v, want %v", p.encoded, err, io.EOF)
+ }
+}
+
+func TestDecoderBuffering(t *testing.T) {
+ for bs := 1; bs <= 12; bs++ {
+ decoder := NewDecoder(StdEncoding, strings.NewReader(bigtest.encoded))
+ buf := make([]byte, len(bigtest.decoded)+12)
+ var total int
+ for total = 0; total < len(bigtest.decoded); {
+ n, err := decoder.Read(buf[total : total+bs])
+ testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, error(nil))
+ total += n
+ }
+ testEqual(t, "Decoding/%d of %q = %q, want %q", bs, bigtest.encoded, string(buf[0:total]), bigtest.decoded)
+ }
+}
+
+func TestDecodeCorrupt(t *testing.T) {
+ testCases := []struct {
+ input string
+ offset int // -1 means no corruption.
+ }{
+ {"", -1},
+ {"!!!!", 0},
+ {"====", 0},
+ {"x===", 1},
+ {"=AAA", 0},
+ {"A=AA", 1},
+ {"AA=A", 2},
+ {"AA==A", 4},
+ {"AAA=AAAA", 4},
+ {"AAAAA", 4},
+ {"AAAAAA", 4},
+ {"A=", 1},
+ {"A==", 1},
+ {"AA=", 3},
+ {"AA==", -1},
+ {"AAA=", -1},
+ {"AAAA", -1},
+ {"AAAAAA=", 7},
+ {"YWJjZA=====", 8},
+ }
+ for _, tc := range testCases {
+ dbuf := make([]byte, StdEncoding.DecodedLen(len(tc.input)))
+ _, err := StdEncoding.Decode(dbuf, []byte(tc.input))
+ if tc.offset == -1 {
+ if err != nil {
+ t.Error("Decoder wrongly detected coruption in", tc.input)
+ }
+ continue
+ }
+ switch err := err.(type) {
+ case CorruptInputError:
+ testEqual(t, "Corruption in %q at offset %v, want %v", tc.input, int(err), tc.offset)
+ default:
+ t.Error("Decoder failed to detect corruption in", tc)
+ }
+ }
+}
+
+func TestBig(t *testing.T) {
+ n := 3*1000 + 1
+ raw := make([]byte, n)
+ const alpha = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ for i := 0; i < n; i++ {
+ raw[i] = alpha[i%len(alpha)]
+ }
+ encoded := new(bytes.Buffer)
+ w := NewEncoder(StdEncoding, encoded)
+ nn, err := w.Write(raw)
+ if nn != n || err != nil {
+ t.Fatalf("Encoder.Write(raw) = %d, %v want %d, nil", nn, err, n)
+ }
+ err = w.Close()
+ if err != nil {
+ t.Fatalf("Encoder.Close() = %v want nil", err)
+ }
+ decoded, err := ioutil.ReadAll(NewDecoder(StdEncoding, encoded))
+ if err != nil {
+ t.Fatalf("ioutil.ReadAll(NewDecoder(...)): %v", err)
+ }
+
+ if !bytes.Equal(raw, decoded) {
+ var i int
+ for i = 0; i < len(decoded) && i < len(raw); i++ {
+ if decoded[i] != raw[i] {
+ break
+ }
+ }
+ t.Errorf("Decode(Encode(%d-byte string)) failed at offset %d", n, i)
+ }
+}
+
+func TestNewLineCharacters(t *testing.T) {
+ // Each of these should decode to the string "sure", without errors.
+ const expected = "sure"
+ examples := []string{
+ "c3VyZQ==",
+ "c3VyZQ==\r",
+ "c3VyZQ==\n",
+ "c3VyZQ==\r\n",
+ "c3VyZ\r\nQ==",
+ "c3V\ryZ\nQ==",
+ "c3V\nyZ\rQ==",
+ "c3VyZ\nQ==",
+ "c3VyZQ\n==",
+ "c3VyZQ=\n=",
+ "c3VyZQ=\r\n\r\n=",
+ }
+ for _, e := range examples {
+ buf, err := StdEncoding.DecodeString(e)
+ if err != nil {
+ t.Errorf("Decode(%q) failed: %v", e, err)
+ continue
+ }
+ if s := string(buf); s != expected {
+ t.Errorf("Decode(%q) = %q, want %q", e, s, expected)
+ }
+ }
+}
+
+type nextRead struct {
+ n int // bytes to return
+ err error // error to return
+}
+
+// faultInjectReader returns data from source, rate-limited
+// and with the errors as written to nextc.
+type faultInjectReader struct {
+ source string
+ nextc <-chan nextRead
+}
+
+func (r *faultInjectReader) Read(p []byte) (int, error) {
+ nr := <-r.nextc
+ if len(p) > nr.n {
+ p = p[:nr.n]
+ }
+ n := copy(p, r.source)
+ r.source = r.source[n:]
+ return n, nr.err
+}
+
+// tests that we don't ignore errors from our underlying reader
+func TestDecoderIssue3577(t *testing.T) {
+ next := make(chan nextRead, 10)
+ wantErr := errors.New("my error")
+ next <- nextRead{5, nil}
+ next <- nextRead{10, wantErr}
+ next <- nextRead{0, wantErr}
+ d := NewDecoder(StdEncoding, &faultInjectReader{
+ source: "VHdhcyBicmlsbGlnLCBhbmQgdGhlIHNsaXRoeSB0b3Zlcw==", // twas brillig...
+ nextc: next,
+ })
+ errc := make(chan error)
+ go func() {
+ _, err := ioutil.ReadAll(d)
+ errc <- err
+ }()
+ select {
+ case err := <-errc:
+ if err != wantErr {
+ t.Errorf("got error %v; want %v", err, wantErr)
+ }
+ case <-time.After(5 * time.Second):
+ t.Errorf("timeout; Decoder blocked without returning an error")
+ }
+}
+
+func TestDecoderIssue4779(t *testing.T) {
+ encoded := `CP/EAT8AAAEF
+AQEBAQEBAAAAAAAAAAMAAQIEBQYHCAkKCwEAAQUBAQEBAQEAAAAAAAAAAQACAwQFBgcICQoLEAAB
+BAEDAgQCBQcGCAUDDDMBAAIRAwQhEjEFQVFhEyJxgTIGFJGhsUIjJBVSwWIzNHKC0UMHJZJT8OHx
+Y3M1FqKygyZEk1RkRcKjdDYX0lXiZfKzhMPTdePzRieUpIW0lcTU5PSltcXV5fVWZnaGlqa2xtbm
+9jdHV2d3h5ent8fX5/cRAAICAQIEBAMEBQYHBwYFNQEAAhEDITESBEFRYXEiEwUygZEUobFCI8FS
+0fAzJGLhcoKSQ1MVY3M08SUGFqKygwcmNcLSRJNUoxdkRVU2dGXi8rOEw9N14/NGlKSFtJXE1OT0
+pbXF1eX1VmZ2hpamtsbW5vYnN0dXZ3eHl6e3x//aAAwDAQACEQMRAD8A9VSSSSUpJJJJSkkkJ+Tj
+1kiy1jCJJDnAcCTykpKkuQ6p/jN6FgmxlNduXawwAzaGH+V6jn/R/wCt71zdn+N/qL3kVYFNYB4N
+ji6PDVjWpKp9TSXnvTf8bFNjg3qOEa2n6VlLpj/rT/pf567DpX1i6L1hs9Py67X8mqdtg/rUWbbf
++gkp0kkkklKSSSSUpJJJJT//0PVUkkklKVLq3WMDpGI7KzrNjADtYNXvI/Mqr/Pd/q9W3vaxjnvM
+NaCXE9gNSvGPrf8AWS3qmba5jjsJhoB0DAf0NDf6sevf+/lf8Hj0JJATfWT6/dV6oXU1uOLQeKKn
+EQP+Hubtfe/+R7Mf/g7f5xcocp++Z11JMCJPgFBxOg7/AOuqDx8I/ikpkXkmSdU8mJIJA/O8EMAy
+j+mSARB/17pKVXYWHXjsj7yIex0PadzXMO1zT5KHoNA3HT8ietoGhgjsfA+CSnvvqh/jJtqsrwOv
+2b6NGNzXfTYexzJ+nU7/ALkf4P8Awv6P9KvTQQ4AgyDqCF85Pho3CTB7eHwXoH+LT65uZbX9X+o2
+bqbPb06551Y4
+`
+ encodedShort := strings.Replace(encoded, "\n", "", -1)
+
+ dec := NewDecoder(StdEncoding, strings.NewReader(encoded))
+ res1, err := ioutil.ReadAll(dec)
+ if err != nil {
+ t.Errorf("ReadAll failed: %v", err)
+ }
+
+ dec = NewDecoder(StdEncoding, strings.NewReader(encodedShort))
+ var res2 []byte
+ res2, err = ioutil.ReadAll(dec)
+ if err != nil {
+ t.Errorf("ReadAll failed: %v", err)
+ }
+
+ if !bytes.Equal(res1, res2) {
+ t.Error("Decoded results not equal")
+ }
+}
+
+func TestDecoderIssue7733(t *testing.T) {
+ s, err := StdEncoding.DecodeString("YWJjZA=====")
+ want := CorruptInputError(8)
+ if !reflect.DeepEqual(want, err) {
+ t.Errorf("Error = %v; want CorruptInputError(8)", err)
+ }
+ if string(s) != "abcd" {
+ t.Errorf("DecodeString = %q; want abcd", s)
+ }
+}
+
+func BenchmarkEncodeToString(b *testing.B) {
+ data := make([]byte, 8192)
+ b.SetBytes(int64(len(data)))
+ for i := 0; i < b.N; i++ {
+ StdEncoding.EncodeToString(data)
+ }
+}
+
+func BenchmarkDecodeString(b *testing.B) {
+ data := StdEncoding.EncodeToString(make([]byte, 8192))
+ b.SetBytes(int64(len(data)))
+ for i := 0; i < b.N; i++ {
+ StdEncoding.DecodeString(data)
+ }
+}
diff --git a/src/encoding/base64/example_test.go b/src/encoding/base64/example_test.go
new file mode 100644
index 000000000..d18b856a0
--- /dev/null
+++ b/src/encoding/base64/example_test.go
@@ -0,0 +1,45 @@
+// Copyright 2012 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.
+
+// Keep in sync with ../base32/example_test.go.
+
+package base64_test
+
+import (
+ "encoding/base64"
+ "fmt"
+ "os"
+)
+
+func ExampleEncoding_EncodeToString() {
+ data := []byte("any + old & data")
+ str := base64.StdEncoding.EncodeToString(data)
+ fmt.Println(str)
+ // Output:
+ // YW55ICsgb2xkICYgZGF0YQ==
+}
+
+func ExampleEncoding_DecodeString() {
+ str := "c29tZSBkYXRhIHdpdGggACBhbmQg77u/"
+ data, err := base64.StdEncoding.DecodeString(str)
+ if err != nil {
+ fmt.Println("error:", err)
+ return
+ }
+ fmt.Printf("%q\n", data)
+ // Output:
+ // "some data with \x00 and \ufeff"
+}
+
+func ExampleNewEncoder() {
+ input := []byte("foo\x00bar")
+ encoder := base64.NewEncoder(base64.StdEncoding, os.Stdout)
+ encoder.Write(input)
+ // Must close the encoder when finished to flush any partial blocks.
+ // If you comment out the following line, the last partial block "r"
+ // won't be encoded.
+ encoder.Close()
+ // Output:
+ // Zm9vAGJhcg==
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-30 12:40:36 +0000