sparklemotion/nokogiri

JRuby: UtfHelpper.writeCharToUtf8 cannot handle unicode supplementary character

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#2,410 建立於 2022年1月5日

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 (9 留言) (0 反應) (0 負責人)Ruby (5,615 star) (806 fork)batch import
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描述

https://github.com/sparklemotion/nokogiri/blob/55029bfba481338825c99e78af2b182b1cc49e04/ext/java/nokogiri/internals/c14n/UtfHelpper.java#L51

since the Canonicalizer process input String character by character. Java uses 16 bits to represent a character; when the input string contains Unicode characters whose code pen are larger than 0Xffff（65535) it will be split into two char, since neither char will not be
recognized, the Unicode characters will be transferred to 2 ??(3f) instead.

for example, if I want to canonicalize an input that contains 𡏅 via c14n, in the output, 𡏅 will be replaced with ??

貢獻者指南

技術棧
java
領域
backend
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
active
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Understanding of Unicode and Java char encoding
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
40
研究方向
The issue is in UtfHelpper.java, specifically the method writeCharToUtf8 that processes characters individually, failing for supplementary characters (code points > U+FFFF). The fix should handle surrogate pairs, iterating over the string using codePointAt or similar. Refer to the file line 51 in the linked source.