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generate replacement rune when asked to encode a negative rune value.
Fixes #425. R=rsc https://golang.org/cl/178043
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@ -227,6 +227,11 @@ func RuneLen(rune int) int {
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// EncodeRune writes into p (which must be large enough) the UTF-8 encoding of the rune.
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// It returns the number of bytes written.
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func EncodeRune(rune int, p []byte) int {
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// Negative values are erroneous.
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if rune < 0 {
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rune = RuneError
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}
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if rune <= _Rune1Max {
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p[0] = byte(rune);
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return 1;
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@ -42,6 +42,7 @@ var utf8map = []Utf8Map{
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Utf8Map{0x10001, "\xf0\x90\x80\x81"},
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Utf8Map{0x10fffe, "\xf4\x8f\xbf\xbe"},
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Utf8Map{0x10ffff, "\xf4\x8f\xbf\xbf"},
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Utf8Map{0xFFFD, "\xef\xbf\xbd"},
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}
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// strings.Bytes with one extra byte at end
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@ -81,7 +82,7 @@ func TestEncodeRune(t *testing.T) {
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n := EncodeRune(m.rune, &buf);
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b1 := buf[0:n];
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if !bytes.Equal(b, b1) {
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t.Errorf("EncodeRune(0x%04x) = %q want %q", m.rune, b1, b)
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t.Errorf("EncodeRune(%#04x) = %q want %q", m.rune, b1, b)
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}
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}
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}
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@ -92,23 +93,23 @@ func TestDecodeRune(t *testing.T) {
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b := makeBytes(m.str);
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rune, size := DecodeRune(b);
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if rune != m.rune || size != len(b) {
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t.Errorf("DecodeRune(%q) = 0x%04x, %d want 0x%04x, %d", b, rune, size, m.rune, len(b))
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t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b, rune, size, m.rune, len(b))
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}
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s := m.str;
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rune, size = DecodeRuneInString(s);
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if rune != m.rune || size != len(b) {
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t.Errorf("DecodeRune(%q) = 0x%04x, %d want 0x%04x, %d", s, rune, size, m.rune, len(b))
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t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", s, rune, size, m.rune, len(b))
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}
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// there's an extra byte that bytes left behind - make sure trailing byte works
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rune, size = DecodeRune(b[0:cap(b)]);
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if rune != m.rune || size != len(b) {
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t.Errorf("DecodeRune(%q) = 0x%04x, %d want 0x%04x, %d", b, rune, size, m.rune, len(b))
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t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b, rune, size, m.rune, len(b))
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}
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s = m.str + "\x00";
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rune, size = DecodeRuneInString(s);
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if rune != m.rune || size != len(b) {
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t.Errorf("DecodeRuneInString(%q) = 0x%04x, %d want 0x%04x, %d", s, rune, size, m.rune, len(b))
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t.Errorf("DecodeRuneInString(%q) = %#04x, %d want %#04x, %d", s, rune, size, m.rune, len(b))
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}
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// make sure missing bytes fail
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@ -118,12 +119,12 @@ func TestDecodeRune(t *testing.T) {
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}
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rune, size = DecodeRune(b[0 : len(b)-1]);
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if rune != RuneError || size != wantsize {
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t.Errorf("DecodeRune(%q) = 0x%04x, %d want 0x%04x, %d", b[0:len(b)-1], rune, size, RuneError, wantsize)
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t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b[0:len(b)-1], rune, size, RuneError, wantsize)
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}
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s = m.str[0 : len(m.str)-1];
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rune, size = DecodeRuneInString(s);
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if rune != RuneError || size != wantsize {
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t.Errorf("DecodeRuneInString(%q) = 0x%04x, %d want 0x%04x, %d", s, rune, size, RuneError, wantsize)
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t.Errorf("DecodeRuneInString(%q) = %#04x, %d want %#04x, %d", s, rune, size, RuneError, wantsize)
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}
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// make sure bad sequences fail
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@ -134,16 +135,27 @@ func TestDecodeRune(t *testing.T) {
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}
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rune, size = DecodeRune(b);
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if rune != RuneError || size != 1 {
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t.Errorf("DecodeRune(%q) = 0x%04x, %d want 0x%04x, %d", b, rune, size, RuneError, 1)
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t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b, rune, size, RuneError, 1)
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}
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s = string(b);
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rune, size = DecodeRune(b);
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if rune != RuneError || size != 1 {
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t.Errorf("DecodeRuneInString(%q) = 0x%04x, %d want 0x%04x, %d", s, rune, size, RuneError, 1)
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t.Errorf("DecodeRuneInString(%q) = %#04x, %d want %#04x, %d", s, rune, size, RuneError, 1)
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}
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}
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}
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// Check that negative runes encode as U+FFFD.
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func TestNegativeRune(t *testing.T) {
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errorbuf := make([]byte, UTFMax);
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errorbuf = errorbuf[0:EncodeRune(RuneError, errorbuf)];
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buf := make([]byte, UTFMax);
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buf = buf[0:EncodeRune(-1, buf)];
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if !bytes.Equal(buf, errorbuf) {
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t.Errorf("incorrect encoding [% x] for -1; expected [% x]", buf, errorbuf)
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}
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}
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type RuneCountTest struct {
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in string;
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out int;
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