utf8: make EncodeRune's destination the first argument.

R=r
CC=golang-dev
https://golang.org/cl/3364041

src/pkg/bufio/bufio.go

@@ -482,7 +482,7 @@ func (b *Writer) WriteRune(rune int) (size int, err os.Error) {
 			return b.WriteString(string(rune))
 		}
 	}
-	size = utf8.EncodeRune(rune, b.buf[b.n:])
+	size = utf8.EncodeRune(b.buf[b.n:], rune)
 	b.n += size
 	return size, nil
 }

src/pkg/bufio/bufio_test.go

@@ -337,7 +337,7 @@ func TestReadWriteRune(t *testing.T) {
 	// Write the runes out using WriteRune
 	buf := make([]byte, utf8.UTFMax)
 	for rune := 0; rune < NRune; rune++ {
-		size := utf8.EncodeRune(rune, buf)
+		size := utf8.EncodeRune(buf, rune)
 		nbytes, err := w.WriteRune(rune)
 		if err != nil {
 			t.Fatalf("WriteRune(0x%x) error: %s", rune, err)
@@ -351,7 +351,7 @@ func TestReadWriteRune(t *testing.T) {
 	r := NewReader(byteBuf)
 	// Read them back with ReadRune
 	for rune := 0; rune < NRune; rune++ {
-		size := utf8.EncodeRune(rune, buf)
+		size := utf8.EncodeRune(buf, rune)
 		nr, nbytes, err := r.ReadRune()
 		if nr != rune || nbytes != size || err != nil {
 			t.Fatalf("ReadRune(0x%x) got 0x%x,%d not 0x%x,%d (err=%s)", r, nr, nbytes, r, size, err)

src/pkg/bytes/buffer.go

@@ -172,7 +172,7 @@ func (b *Buffer) WriteRune(r int) (n int, err os.Error) {
 		b.WriteByte(byte(r))
 		return 1, nil
 	}
-	n = utf8.EncodeRune(r, b.runeBytes[0:])
+	n = utf8.EncodeRune(b.runeBytes[0:], r)
 	b.Write(b.runeBytes[0:n])
 	return n, nil
 }

src/pkg/bytes/buffer_test.go

@@ -272,7 +272,7 @@ func TestRuneIO(t *testing.T) {
 	var buf Buffer
 	n := 0
 	for r := 0; r < NRune; r++ {
-		size := utf8.EncodeRune(r, b[n:])
+		size := utf8.EncodeRune(b[n:], r)
 		nbytes, err := buf.WriteRune(r)
 		if err != nil {
 			t.Fatalf("WriteRune(0x%x) error: %s", r, err)
@@ -291,7 +291,7 @@ func TestRuneIO(t *testing.T) {
 
 	// Read it back with ReadRune
 	for r := 0; r < NRune; r++ {
-		size := utf8.EncodeRune(r, b)
+		size := utf8.EncodeRune(b, r)
 		nr, nbytes, err := buf.ReadRune()
 		if nr != r || nbytes != size || err != nil {
 			t.Fatalf("ReadRune(0x%x) got 0x%x,%d not 0x%x,%d (err=%s)", r, nr, nbytes, r, size, err)

src/pkg/bytes/bytes.go

@@ -347,7 +347,7 @@ func Map(mapping func(rune int) int, s []byte) []byte {
 				copy(nb, b[0:nbytes])
 				b = nb
 			}
-			nbytes += utf8.EncodeRune(rune, b[nbytes:maxbytes])
+			nbytes += utf8.EncodeRune(b[nbytes:maxbytes], rune)
 		}
 		i += wid
 	}

src/pkg/crypto/block/cbc_aes_test.go

-// 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.
-
-// CBC AES test vectors.
-
-// See U.S. National Institute of Standards and Technology (NIST)
-// Special Publication 800-38A, ``Recommendation for Block Cipher
-// Modes of Operation,'' 2001 Edition, pp. 24-29.
-
-package block
-
-import (
-	"bytes"
-	"crypto/aes"
-	"io"
-	"testing"
-)
-
-type cbcTest struct {
-	name string
-	key  []byte
-	iv   []byte
-	in   []byte
-	out  []byte
-}
-
-var cbcAESTests = []cbcTest{
-	// NIST SP 800-38A pp 27-29
-	{
-		"CBC-AES128",
-		commonKey128,
-		commonIV,
-		commonInput,
-		[]byte{
-			0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d,
-			0x50, 0x86, 0xcb, 0x9b, 0x50, 0x72, 0x19, 0xee, 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2,
-			0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16,
-			0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09, 0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7,
-		},
-	},
-	{
-		"CBC-AES192",
-		commonKey192,
-		commonIV,
-		commonInput,
-		[]byte{
-			0x4f, 0x02, 0x1d, 0xb2, 0x43, 0xbc, 0x63, 0x3d, 0x71, 0x78, 0x18, 0x3a, 0x9f, 0xa0, 0x71, 0xe8,
-			0xb4, 0xd9, 0xad, 0xa9, 0xad, 0x7d, 0xed, 0xf4, 0xe5, 0xe7, 0x38, 0x76, 0x3f, 0x69, 0x14, 0x5a,
-			0x57, 0x1b, 0x24, 0x20, 0x12, 0xfb, 0x7a, 0xe0, 0x7f, 0xa9, 0xba, 0xac, 0x3d, 0xf1, 0x02, 0xe0,
-			0x08, 0xb0, 0xe2, 0x79, 0x88, 0x59, 0x88, 0x81, 0xd9, 0x20, 0xa9, 0xe6, 0x4f, 0x56, 0x15, 0xcd,
-		},
-	},
-	{
-		"CBC-AES256",
-		commonKey256,
-		commonIV,
-		commonInput,
-		[]byte{
-			0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba, 0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6,
-			0x9c, 0xfc, 0x4e, 0x96, 0x7e, 0xdb, 0x80, 0x8d, 0x67, 0x9f, 0x77, 0x7b, 0xc6, 0x70, 0x2c, 0x7d,
-			0x39, 0xf2, 0x33, 0x69, 0xa9, 0xd9, 0xba, 0xcf, 0xa5, 0x30, 0xe2, 0x63, 0x04, 0x23, 0x14, 0x61,
-			0xb2, 0xeb, 0x05, 0xe2, 0xc3, 0x9b, 0xe9, 0xfc, 0xda, 0x6c, 0x19, 0x07, 0x8c, 0x6a, 0x9d, 0x1b,
-		},
-	},
-}
-
-func TestCBC_AES(t *testing.T) {
-	for _, tt := range cbcAESTests {
-		test := tt.name
-
-		c, err := aes.NewCipher(tt.key)
-		if err != nil {
-			t.Errorf("%s: NewCipher(%d bytes) = %s", test, len(tt.key), err)
-			continue
-		}
-
-		var crypt bytes.Buffer
-		w := NewCBCEncrypter(c, tt.iv, &crypt)
-		var r io.Reader = bytes.NewBuffer(tt.in)
-		n, err := io.Copy(w, r)
-		if n != int64(len(tt.in)) || err != nil {
-			t.Errorf("%s: CBCEncrypter io.Copy = %d, %v want %d, nil", test, n, err, len(tt.in))
-		} else if d := crypt.Bytes(); !same(tt.out, d) {
-			t.Errorf("%s: CBCEncrypter\nhave %x\nwant %x", test, d, tt.out)
-		}
-
-		var plain bytes.Buffer
-		r = NewCBCDecrypter(c, tt.iv, bytes.NewBuffer(tt.out))
-		w = &plain
-		n, err = io.Copy(w, r)
-		if n != int64(len(tt.out)) || err != nil {
-			t.Errorf("%s: CBCDecrypter io.Copy = %d, %v want %d, nil", test, n, err, len(tt.out))
-		} else if d := plain.Bytes(); !same(tt.in, d) {
-			t.Errorf("%s: CBCDecrypter\nhave %x\nwant %x", test, d, tt.in)
-		}
-
-		if t.Failed() {
-			break
-		}
-	}
-}

src/pkg/crypto/block/ctr_aes_test.go

-// 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.
-
-// CTR AES test vectors.
-
-// See U.S. National Institute of Standards and Technology (NIST)
-// Special Publication 800-38A, ``Recommendation for Block Cipher
-// Modes of Operation,'' 2001 Edition, pp. 55-58.
-
-package block
-
-import (
-	"bytes"
-	"crypto/aes"
-	"io"
-	"testing"
-)
-
-type ctrTest struct {
-	name string
-	key  []byte
-	iv   []byte
-	in   []byte
-	out  []byte
-}
-
-var commonCounter = []byte{0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}
-
-var ctrAESTests = []ctrTest{
-	// NIST SP 800-38A pp 55-58
-	{
-		"CTR-AES128",
-		commonKey128,
-		commonCounter,
-		commonInput,
-		[]byte{
-			0x87, 0x4d, 0x61, 0x91, 0xb6, 0x20, 0xe3, 0x26, 0x1b, 0xef, 0x68, 0x64, 0x99, 0x0d, 0xb6, 0xce,
-			0x98, 0x06, 0xf6, 0x6b, 0x79, 0x70, 0xfd, 0xff, 0x86, 0x17, 0x18, 0x7b, 0xb9, 0xff, 0xfd, 0xff,
-			0x5a, 0xe4, 0xdf, 0x3e, 0xdb, 0xd5, 0xd3, 0x5e, 0x5b, 0x4f, 0x09, 0x02, 0x0d, 0xb0, 0x3e, 0xab,
-			0x1e, 0x03, 0x1d, 0xda, 0x2f, 0xbe, 0x03, 0xd1, 0x79, 0x21, 0x70, 0xa0, 0xf3, 0x00, 0x9c, 0xee,
-		},
-	},
-	{
-		"CTR-AES192",
-		commonKey192,
-		commonCounter,
-		commonInput,
-		[]byte{
-			0x1a, 0xbc, 0x93, 0x24, 0x17, 0x52, 0x1c, 0xa2, 0x4f, 0x2b, 0x04, 0x59, 0xfe, 0x7e, 0x6e, 0x0b,
-			0x09, 0x03, 0x39, 0xec, 0x0a, 0xa6, 0xfa, 0xef, 0xd5, 0xcc, 0xc2, 0xc6, 0xf4, 0xce, 0x8e, 0x94,
-			0x1e, 0x36, 0xb2, 0x6b, 0xd1, 0xeb, 0xc6, 0x70, 0xd1, 0xbd, 0x1d, 0x66, 0x56, 0x20, 0xab, 0xf7,
-			0x4f, 0x78, 0xa7, 0xf6, 0xd2, 0x98, 0x09, 0x58, 0x5a, 0x97, 0xda, 0xec, 0x58, 0xc6, 0xb0, 0x50,
-		},
-	},
-	{
-		"CTR-AES256",
-		commonKey256,
-		commonCounter,
-		commonInput,
-		[]byte{
-			0x60, 0x1e, 0xc3, 0x13, 0x77, 0x57, 0x89, 0xa5, 0xb7, 0xa7, 0xf5, 0x04, 0xbb, 0xf3, 0xd2, 0x28,
-			0xf4, 0x43, 0xe3, 0xca, 0x4d, 0x62, 0xb5, 0x9a, 0xca, 0x84, 0xe9, 0x90, 0xca, 0xca, 0xf5, 0xc5,
-			0x2b, 0x09, 0x30, 0xda, 0xa2, 0x3d, 0xe9, 0x4c, 0xe8, 0x70, 0x17, 0xba, 0x2d, 0x84, 0x98, 0x8d,
-			0xdf, 0xc9, 0xc5, 0x8d, 0xb6, 0x7a, 0xad, 0xa6, 0x13, 0xc2, 0xdd, 0x08, 0x45, 0x79, 0x41, 0xa6,
-		},
-	},
-}
-
-func TestCTR_AES(t *testing.T) {
-	for _, tt := range ctrAESTests {
-		test := tt.name
-
-		c, err := aes.NewCipher(tt.key)
-		if err != nil {
-			t.Errorf("%s: NewCipher(%d bytes) = %s", test, len(tt.key), err)
-			continue
-		}
-
-		for j := 0; j <= 5; j += 5 {
-			var crypt bytes.Buffer
-			in := tt.in[0 : len(tt.in)-j]
-			w := NewCTRWriter(c, tt.iv, &crypt)
-			var r io.Reader = bytes.NewBuffer(in)
-			n, err := io.Copy(w, r)
-			if n != int64(len(in)) || err != nil {
-				t.Errorf("%s/%d: CTRWriter io.Copy = %d, %v want %d, nil", test, len(in), n, err, len(in))
-			} else if d, out := crypt.Bytes(), tt.out[0:len(in)]; !same(out, d) {
-				t.Errorf("%s/%d: CTRWriter\ninpt %x\nhave %x\nwant %x", test, len(in), in, d, out)
-			}
-		}
-
-		for j := 0; j <= 7; j += 7 {
-			var plain bytes.Buffer
-			out := tt.out[0 : len(tt.out)-j]
-			r := NewCTRReader(c, tt.iv, bytes.NewBuffer(out))
-			w := &plain
-			n, err := io.Copy(w, r)
-			if n != int64(len(out)) || err != nil {
-				t.Errorf("%s/%d: CTRReader io.Copy = %d, %v want %d, nil", test, len(out), n, err, len(out))
-			} else if d, in := plain.Bytes(), tt.in[0:len(out)]; !same(in, d) {
-				t.Errorf("%s/%d: CTRReader\nhave %x\nwant %x", test, len(out), d, in)
-			}
-		}
-
-		if t.Failed() {
-			break
-		}
-	}
-}

src/pkg/fmt/print.go

@@ -120,7 +120,7 @@ func (p *pp) add(c int) {
 	if c < utf8.RuneSelf {
 		p.buf.WriteByte(byte(c))
 	} else {
-		w := utf8.EncodeRune(c, p.runeBuf[0:])
+		w := utf8.EncodeRune(p.runeBuf[0:], c)
 		p.buf.Write(p.runeBuf[0:w])
 	}
 }
@@ -300,7 +300,7 @@ func (p *pp) fmtC(c int64) {
 	if int64(rune) != c {
 		rune = utf8.RuneError
 	}
-	w := utf8.EncodeRune(rune, p.runeBuf[0:utf8.UTFMax])
+	w := utf8.EncodeRune(p.runeBuf[0:utf8.UTFMax], rune)
 	p.fmt.pad(p.runeBuf[0:w])
 }
 

src/pkg/html/escape.go

@@ -32,7 +32,7 @@ func unescapeEntity(b []byte, dst, src int) (dst1, src1 int) {
 		}
 		x := entity[string(s[1:i])]
 		if x != 0 {
-			return dst + utf8.EncodeRune(x, b[dst:]), src + i
+			return dst + utf8.EncodeRune(b[dst:], x), src + i
 		}
 		break
 	}

src/pkg/json/decode.go

@@ -831,13 +831,13 @@ func unquote(s []byte) (t string, ok bool) {
 					if dec := utf16.DecodeRune(rune, rune1); dec != unicode.ReplacementChar {
 						// A valid pair; consume.
 						r += 6
-						w += utf8.EncodeRune(dec, b[w:])
+						w += utf8.EncodeRune(b[w:], dec)
 						break
 					}
 					// Invalid surrogate; fall back to replacement rune.
 					rune = unicode.ReplacementChar
 				}
-				w += utf8.EncodeRune(rune, b[w:])
+				w += utf8.EncodeRune(b[w:], rune)
 			}
 
 		// Quote, control characters are invalid.
@@ -854,7 +854,7 @@ func unquote(s []byte) (t string, ok bool) {
 		default:
 			rune, size := utf8.DecodeRune(s[r:])
 			r += size
-			w += utf8.EncodeRune(rune, b[w:])
+			w += utf8.EncodeRune(b[w:], rune)
 		}
 	}
 	return string(b[0:w]), true

src/pkg/regexp/regexp.go

@@ -674,7 +674,7 @@ Loop:
 		case _BOT, _EOT, _ALT:
 			break Loop
 		}
-		n := utf8.EncodeRune(inst.(*_Char).char, utf)
+		n := utf8.EncodeRune(utf, inst.(*_Char).char)
 		b = bytes.Add(b, utf[0:n])
 		i = inst.next().index()
 	}

src/pkg/strings/strings.go

@@ -317,7 +317,7 @@ func Map(mapping func(rune int) int, s string) string {
 				copy(nb, b[0:nbytes])
 				b = nb
 			}
-			nbytes += utf8.EncodeRune(rune, b[nbytes:maxbytes])
+			nbytes += utf8.EncodeRune(b[nbytes:maxbytes], rune)
 		}
 	}
 	return string(b[0:nbytes])

src/pkg/utf8/utf8.go

@@ -293,7 +293,7 @@ func RuneLen(rune int) int {
 
 // EncodeRune writes into p (which must be large enough) the UTF-8 encoding of the rune.
 // It returns the number of bytes written.
-func EncodeRune(rune int, p []byte) int {
+func EncodeRune(p []byte, rune int) int {
 	// Negative values are erroneous.  Making it unsigned addresses the problem.
 	r := uint(rune)
 

src/pkg/utf8/utf8_test.go

@@ -80,7 +80,7 @@ func TestEncodeRune(t *testing.T) {
 		m := utf8map[i]
 		b := []byte(m.str)
 		var buf [10]byte
-		n := EncodeRune(m.rune, buf[0:])
+		n := EncodeRune(buf[0:], m.rune)
 		b1 := buf[0:n]
 		if !bytes.Equal(b, b1) {
 			t.Errorf("EncodeRune(%#04x) = %q want %q", m.rune, b1, b)
@@ -242,9 +242,9 @@ func testSequence(t *testing.T, s string) {
 // Check that negative runes encode as U+FFFD.
 func TestNegativeRune(t *testing.T) {
 	errorbuf := make([]byte, UTFMax)
-	errorbuf = errorbuf[0:EncodeRune(RuneError, errorbuf)]
+	errorbuf = errorbuf[0:EncodeRune(errorbuf, RuneError)]
 	buf := make([]byte, UTFMax)
-	buf = buf[0:EncodeRune(-1, buf)]
+	buf = buf[0:EncodeRune(buf, -1)]
 	if !bytes.Equal(buf, errorbuf) {
 		t.Errorf("incorrect encoding [% x] for -1; expected [% x]", buf, errorbuf)
 	}
@@ -289,14 +289,14 @@ func BenchmarkRuneCountTenJapaneseChars(b *testing.B) {
 func BenchmarkEncodeASCIIRune(b *testing.B) {
 	buf := make([]byte, UTFMax)
 	for i := 0; i < b.N; i++ {
-		EncodeRune('a', buf)
+		EncodeRune(buf, 'a')
 	}
 }
 
 func BenchmarkEncodeJapaneseRune(b *testing.B) {
 	buf := make([]byte, UTFMax)
 	for i := 0; i < b.N; i++ {
-		EncodeRune('本', buf)
+		EncodeRune(buf, '本')
 	}
 }