forked from gitea/gitea
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>
This commit is contained in:
zeripath
GitHub
parent
f6c992974e
commit
bc4764ffc6
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@ -131,7 +131,26 @@ func RemoveBOMIfPresent(content []byte) []byte {
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// DetectEncoding detect the encoding of content
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func DetectEncoding(content []byte) (string, error) {
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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.
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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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if end < 0 {
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// no-op
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} else if toValidate[end]>>5 == 0b110 {
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// Incomplete 1 byte extension e.g. © <c2><a9> which has been truncated to <c2>
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toValidate = toValidate[:end]
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} 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>
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toValidate = toValidate[:end-1]
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} 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>
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toValidate = toValidate[:end-2]
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}
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if utf8.Valid(toValidate) {
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log.Debug("Detected encoding: utf-8 (fast)")
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return "UTF-8", nil
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}
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@ -5,6 +5,8 @@
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package charset
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import (
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"bytes"
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"io"
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"strings"
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"testing"
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@ -304,3 +306,145 @@ func stringMustEndWith(t *testing.T, expected, value string) {
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func bytesMustStartWith(t *testing.T, expected, value []byte) {
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assert.Equal(t, expected, value[:len(expected)])
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}
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func TestToUTF8WithFallbackReader(t *testing.T) {
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resetDefaultCharsetsOrder()
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for testLen := 0; testLen < 2048; testLen++ {
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pattern := " test { () }\n"
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input := ""
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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"
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rd := ToUTF8WithFallbackReader(bytes.NewReader([]byte(input)))
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r, _ := io.ReadAll(rd)
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assert.EqualValuesf(t, input, string(r), "testing string len=%d", testLen)
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}
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truncatedOneByteExtension := failFastBytes
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encoding, _ := DetectEncoding(truncatedOneByteExtension)
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assert.Equal(t, "UTF-8", encoding)
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truncatedTwoByteExtension := failFastBytes
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truncatedTwoByteExtension[len(failFastBytes)-1] = 0x9b
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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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truncatedThreeByteExtension := failFastBytes
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truncatedThreeByteExtension[len(failFastBytes)-1] = 0x92
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truncatedThreeByteExtension[len(failFastBytes)-2] = 0x9f
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truncatedThreeByteExtension[len(failFastBytes)-3] = 0xf0
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encoding, _ = DetectEncoding(truncatedThreeByteExtension)
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assert.Equal(t, "UTF-8", encoding)
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}
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var failFastBytes = []byte{
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}
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||||
|
|
|
|||
Loading…
Reference in New Issue