Bit Manipulation - UTF-8 Validation
Consider this buggy UTF-8 validation snippet. Which line contains the subtle bug that allows invalid UTF-8 sequences to pass?
Consider this buggy UTF-8 validation snippet. Which line contains the subtle bug that allows invalid UTF-8 sequences to pass?
medium🐞 Bug Identification Q7 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify continuation byte handling
Continuation bytes must decrement remaining to track progress.Step 2: Locate missing decrement
Code lacks 'remaining -= 1' after validating continuation byte, causing infinite remaining count.Final Answer:
Option D -> Option DQuick Check:
Missing decrement causes false positives [OK]
Quick Trick: Check if continuation byte counter decrements [OK]
Common Mistakes:
MISTAKES- Forgetting to decrement remaining
- Misplacing decrement outside else block
Trap Explanation:
PITFALL- Candidates overlook decrement step, causing invalid sequences to pass validation.
Interviewer Note:
CONTEXT- Tests attention to subtle state updates in bitmask-based validation.
Master "UTF-8 Validation" in Bit Manipulation
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Bit Manipulation Quizzes