sparklemotion/nokogiri

JRuby: UtfHelpper.writeCharToUtf8 cannot handle unicode supplementary character

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#2,410 创建于 2022年1月5日

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 (9 评论) (0 反应) (0 负责人)Ruby (5,615 star) (806 fork)batch import
blockedhelp wantedplatform/jrubytopic/encoding

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 ??

贡献者指南

技术栈
java
领域
backend
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
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1-3 hours
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active
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clear
前置要求
Understanding of Unicode and Java char encoding
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
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.