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
2 changed files with 164 additions and 1 deletions
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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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}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue