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Don't treat BOM escape sequence as hidden character. (#18909) (#18910)

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* Don't treat BOM escape sequence as hidden character. (#18909)

Backport #18909
This commit is contained in:
Gusted
2022-02-26 22:15:04 +00:00
committed by GitHub
parent df35049196
commit 4fb718d405
2 changed files with 27 additions and 5 deletions
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8
modules/charset/escape.go
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@@ -63,6 +63,7 @@ func EscapeControlBytes(text []byte) (EscapeStatus, []byte) {
func EscapeControlReader(text io.Reader, output io.Writer) (escaped EscapeStatus, err error) {
buf := make([]byte, 4096)
readStart := 0
runeCount := 0
var n int
var writePos int
@@ -79,6 +80,8 @@ readingloop:
for i < len(bs) {
r, size := utf8.DecodeRune(bs[i:])
runeCount++
// Now handle the codepoints
switch {
case r == utf8.RuneError:
@@ -113,6 +116,8 @@ readingloop:
lineHasRTLScript = false
lineHasLTRScript = false
case runeCount == 1 && r == 0xFEFF: // UTF BOM
// the first BOM is safe
case r == '\r' || r == '\t' || r == ' ':
// These are acceptable control characters and space characters
case unicode.IsSpace(r):
@@ -144,7 +149,8 @@ readingloop:
return
}
writePos = i + size
case unicode.Is(unicode.C, r):
// 65279 == BOM rune.
case unicode.Is(unicode.C, r) && r != rune(65279):
escaped.Escaped = true
escaped.HasControls = true
if writePos < i {