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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)
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 <[email protected]>
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2 files changed

+164
-1
lines changed

2 files changed

+164
-1
lines changed

‎modules/charset/charset.go

Lines changed: 20 additions & 1 deletion
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) {
134+
// First we check if the content represents valid utf8 content excepting a truncated character at the end.
135+
136+
// Now we could decode all the runes in turn but this is not necessarily the cheapest thing to do
137+
// instead we walk backwards from the end to trim off a the incomplete character
138+
toValidate := content
139+
end := len(toValidate) - 1
140+
141+
if end < 0 {
142+
// no-op
143+
} else if toValidate[end]>>5 == 0b110 {
144+
// Incomplete 1 byte extension e.g. © <c2><a9> which has been truncated to <c2>
145+
toValidate = toValidate[:end]
146+
} else if end > 0 && toValidate[end]>>6 == 0b10 && toValidate[end-1]>>4 == 0b1110 {
147+
// 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 {
150+
// Incomplete 3 byte extension e.g. 💩 <f0><9f><92><a9> which has been truncated to <f0><9f><92>
151+
toValidate = toValidate[:end-2]
152+
}
153+
if utf8.Valid(toValidate) {
135154
log.Debug("Detected encoding: utf-8 (fast)")
136155
return "UTF-8", nil
137156
}

‎modules/charset/charset_test.go

Lines changed: 144 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5,6 +5,8 @@
55
package charset
66

77
import (
8+
"bytes"
9+
"io"
810
"strings"
911
"testing"
1012

@@ -304,3 +306,145 @@ func stringMustEndWith(t *testing.T, expected, value string) {
304306
func bytesMustStartWith(t *testing.T, expected, value []byte) {
305307
assert.Equal(t, expected, value[:len(expected)])
306308
}
309+
310+
func TestToUTF8WithFallbackReader(t *testing.T) {
311+
resetDefaultCharsetsOrder()
312+
313+
for testLen := 0; testLen < 2048; testLen++ {
314+
pattern := " test { () }\n"
315+
input := ""
316+
for len(input) < testLen {
317+
input += pattern
318+
}
319+
input = input[:testLen]
320+
input += "// Выключаем"
321+
rd := ToUTF8WithFallbackReader(bytes.NewReader([]byte(input)))
322+
r, _ := io.ReadAll(rd)
323+
assert.EqualValuesf(t, input, string(r), "testing string len=%d", testLen)
324+
}
325+
326+
truncatedOneByteExtension := failFastBytes
327+
encoding, _ := DetectEncoding(truncatedOneByteExtension)
328+
assert.Equal(t, "UTF-8", encoding)
329+
330+
truncatedTwoByteExtension := failFastBytes
331+
truncatedTwoByteExtension[len(failFastBytes)-1] = 0x9b
332+
truncatedTwoByteExtension[len(failFastBytes)-2] = 0xe2
333+
334+
encoding, _ = DetectEncoding(truncatedTwoByteExtension)
335+
assert.Equal(t, "UTF-8", encoding)
336+
337+
truncatedThreeByteExtension := failFastBytes
338+
truncatedThreeByteExtension[len(failFastBytes)-1] = 0x92
339+
truncatedThreeByteExtension[len(failFastBytes)-2] = 0x9f
340+
truncatedThreeByteExtension[len(failFastBytes)-3] = 0xf0
341+
342+
encoding, _ = DetectEncoding(truncatedThreeByteExtension)
343+
assert.Equal(t, "UTF-8", encoding)
344+
}
345+
346+
var failFastBytes = []byte{
347+
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