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zeripathzeripath
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Detect truncated utf-8 characters at the end of content as still representing utf-8 (#19773) (#19774)
Backport #19773 Our character detection algorithm can potentially incorrectly detect utf-8 as iso-8859-x if there is a truncated character at the end of the partially read file. This PR changes the detection algorithm to truncated utf8 characters at the end of the buffer. Fix #19743 Signed-off-by: Andrew Thornton <art27@cantab.net>
1 parent fe94585 commit be99eb2

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2 files changed

+164
-1
lines changed

2 files changed

+164
-1
lines changed

‎modules/charset/charset.go

+20-1
Original file line numberDiff line numberDiff line change
@@ -131,7 +131,26 @@ func RemoveBOMIfPresent(content []byte) []byte {
131131

132132
// DetectEncoding detect the encoding of content
133133
func DetectEncoding(content []byte) (string, error) {
134-
if utf8.Valid(content) {
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// First we check if the content represents valid utf8 content excepting a truncated character at the end.
135+
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// Now we could decode all the runes in turn but this is not necessarily the cheapest thing to do
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// instead we walk backwards from the end to trim off a the incomplete character
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toValidate := content
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end := len(toValidate) - 1
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141+
if end < 0 {
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// no-op
143+
} else if toValidate[end]>>5 == 0b110 {
144+
// Incomplete 1 byte extension e.g. © <c2><a9> which has been truncated to <c2>
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toValidate = toValidate[:end]
146+
} else if end > 0 && toValidate[end]>>6 == 0b10 && toValidate[end-1]>>4 == 0b1110 {
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// Incomplete 2 byte extension e.g. ⛔ <e2><9b><94> which has been truncated to <e2><9b>
148+
toValidate = toValidate[:end-1]
149+
} else if end > 1 && toValidate[end]>>6 == 0b10 && toValidate[end-1]>>6 == 0b10 && toValidate[end-2]>>3 == 0b11110 {
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// Incomplete 3 byte extension e.g. 💩 <f0><9f><92><a9> which has been truncated to <f0><9f><92>
151+
toValidate = toValidate[:end-2]
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}
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if utf8.Valid(toValidate) {
135154
log.Debug("Detected encoding: utf-8 (fast)")
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return "UTF-8", nil
137156
}

‎modules/charset/charset_test.go

+144
Original file line numberDiff line numberDiff line change
@@ -5,6 +5,8 @@
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package charset
66

77
import (
8+
"bytes"
9+
"io"
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"strings"
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"testing"
1012

@@ -272,3 +274,145 @@ func stringMustEndWith(t *testing.T, expected, value string) {
272274
func bytesMustStartWith(t *testing.T, expected, value []byte) {
273275
assert.Equal(t, expected, value[:len(expected)])
274276
}
277+
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func TestToUTF8WithFallbackReader(t *testing.T) {
279+
resetDefaultCharsetsOrder()
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for testLen := 0; testLen < 2048; testLen++ {
282+
pattern := " test { () }\n"
283+
input := ""
284+
for len(input) < testLen {
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input += pattern
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}
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input = input[:testLen]
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input += "// Выключаем"
289+
rd := ToUTF8WithFallbackReader(bytes.NewReader([]byte(input)))
290+
r, _ := io.ReadAll(rd)
291+
assert.EqualValuesf(t, input, string(r), "testing string len=%d", testLen)
292+
}
293+
294+
truncatedOneByteExtension := failFastBytes
295+
encoding, _ := DetectEncoding(truncatedOneByteExtension)
296+
assert.Equal(t, "UTF-8", encoding)
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298+
truncatedTwoByteExtension := failFastBytes
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truncatedTwoByteExtension[len(failFastBytes)-1] = 0x9b
300+
truncatedTwoByteExtension[len(failFastBytes)-2] = 0xe2
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encoding, _ = DetectEncoding(truncatedTwoByteExtension)
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assert.Equal(t, "UTF-8", encoding)
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305+
truncatedThreeByteExtension := failFastBytes
306+
truncatedThreeByteExtension[len(failFastBytes)-1] = 0x92
307+
truncatedThreeByteExtension[len(failFastBytes)-2] = 0x9f
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truncatedThreeByteExtension[len(failFastBytes)-3] = 0xf0
309+
310+
encoding, _ = DetectEncoding(truncatedThreeByteExtension)
311+
assert.Equal(t, "UTF-8", encoding)
312+
}
313+
314+
var failFastBytes = []byte{
315+
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