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Detect truncated utf-8 characters at the end of content as still representing utf-8 (#19773) #19774

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Merged
merged 1 commit into from
May 21, 2022
Merged

Detect truncated utf-8 characters at the end of content as still representing utf-8 (#19773) #19774

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21 changes: 20 additions & 1 deletion modules/charset/charset.go
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Original file line number Diff line number Diff line change
Expand Up @@ -131,7 +131,26 @@ func RemoveBOMIfPresent(content []byte) []byte {

// DetectEncoding detect the encoding of content
func DetectEncoding(content []byte) (string, error) {
if utf8.Valid(content) {
// First we check if the content represents valid utf8 content excepting a truncated character at the end.

// Now we could decode all the runes in turn but this is not necessarily the cheapest thing to do
// instead we walk backwards from the end to trim off a the incomplete character
toValidate := content
end := len(toValidate) - 1

if end < 0 {
// no-op
} else if toValidate[end]>>5 == 0b110 {
// Incomplete 1 byte extension e.g. © <c2><a9> which has been truncated to <c2>
toValidate = toValidate[:end]
} else if end > 0 && toValidate[end]>>6 == 0b10 && toValidate[end-1]>>4 == 0b1110 {
// Incomplete 2 byte extension e.g. ⛔ <e2><9b><94> which has been truncated to <e2><9b>
toValidate = toValidate[:end-1]
} else if end > 1 && toValidate[end]>>6 == 0b10 && toValidate[end-1]>>6 == 0b10 && toValidate[end-2]>>3 == 0b11110 {
// Incomplete 3 byte extension e.g. 💩 <f0><9f><92><a9> which has been truncated to <f0><9f><92>
toValidate = toValidate[:end-2]
}
if utf8.Valid(toValidate) {
log.Debug("Detected encoding: utf-8 (fast)")
return "UTF-8", nil
}
Expand Down
144 changes: 144 additions & 0 deletions modules/charset/charset_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@
package charset

import (
"bytes"
"io"
"strings"
"testing"

Expand Down Expand Up @@ -272,3 +274,145 @@ func stringMustEndWith(t *testing.T, expected, value string) {
func bytesMustStartWith(t *testing.T, expected, value []byte) {
assert.Equal(t, expected, value[:len(expected)])
}

func TestToUTF8WithFallbackReader(t *testing.T) {
resetDefaultCharsetsOrder()

for testLen := 0; testLen < 2048; testLen++ {
pattern := " test { () }\n"
input := ""
for len(input) < testLen {
input += pattern
}
input = input[:testLen]
input += "// Выключаем"
rd := ToUTF8WithFallbackReader(bytes.NewReader([]byte(input)))
r, _ := io.ReadAll(rd)
assert.EqualValuesf(t, input, string(r), "testing string len=%d", testLen)
}

truncatedOneByteExtension := failFastBytes
encoding, _ := DetectEncoding(truncatedOneByteExtension)
assert.Equal(t, "UTF-8", encoding)

truncatedTwoByteExtension := failFastBytes
truncatedTwoByteExtension[len(failFastBytes)-1] = 0x9b
truncatedTwoByteExtension[len(failFastBytes)-2] = 0xe2

encoding, _ = DetectEncoding(truncatedTwoByteExtension)
assert.Equal(t, "UTF-8", encoding)

truncatedThreeByteExtension := failFastBytes
truncatedThreeByteExtension[len(failFastBytes)-1] = 0x92
truncatedThreeByteExtension[len(failFastBytes)-2] = 0x9f
truncatedThreeByteExtension[len(failFastBytes)-3] = 0xf0

encoding, _ = DetectEncoding(truncatedThreeByteExtension)
assert.Equal(t, "UTF-8", encoding)
}

var failFastBytes = []byte{
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