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Detect truncated utf-8 characters at the end of content as still representing utf-8 (#19773)

Browse Source 
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
2022-05-21 14:06:24 +01:00
committed by GitHub
parent f6c992974e
commit bc4764ffc6
2 changed files with 164 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

144
modules/charset/charset_test.go
View File

@@ -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{
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