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 <art27@cantab.net>

Changes

2 changed files (+164/-1)

• modules/charset/charset.go
  • @@ -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 }
• modules/charset/charset_test.go
  • @@ -5,6 +5,8 @@
    package charset import ( + "bytes" + "io" "strings" "testing"
  • @@ -304,3 +306,145 @@ 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{ + 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x6f, 0x72, 0x67, 0x2e, 0x61, 0x70, 0x61, 0x63, 0x68, 0x65, 0x2e, 0x74, 0x6f, + 0x6f, 0x6c, 0x73, 0x2e, 0x61, 0x6e, 0x74, 0x2e, 0x74, 0x61, 0x73, 0x6b, 0x64, 0x65, 0x66, 0x73, 0x2e, 0x63, 0x6f, 0x6e, + 0x64, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x4f, 0x73, 0x0a, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x6f, 0x72, 0x67, + 0x2e, 0x73, 0x70, 0x72, 0x69, 0x6e, 0x67, 0x66, 0x72, 0x61, 0x6d, 0x65, 0x77, 0x6f, 0x72, 0x6b, 0x2e, 0x62, 0x6f, 0x6f, + 0x74, 0x2e, 0x67, 0x72, 0x61, 0x64, 0x6c, 0x65, 0x2e, 0x74, 0x61, 0x73, 0x6b, 0x73, 0x2e, 0x72, 0x75, 0x6e, 0x2e, 0x42, + 0x6f, 0x6f, 0x74, 0x52, 0x75, 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