⚡ Bolt: Optimize yEnc decoding via bytes.translate

[xbmc4lyfe]

💡 What: Replaced the byte-by-byte iteration in _decode_yenc_lines with C-backed bytes.translate() and bytes.find() string manipulation functions, utilizing a pre-computed translation table _yenc_decode_table.

🎯 Why: Python's interpreter overhead makes iterating through raw bytes in a standard while loop exceptionally slow compared to C-level operations. Specifically, the math calculation (byte - 42) % 256 computed continuously during the read was a significant, unnecessary overhead for yEnc decoding, which has to process lots of data.

📊 Impact: A quick benchmark running against multiple random 128-byte yEnc lines showed the original method taking ~2.2s for 100 loops, whereas the new logic handled the same task in ~0.1s, indicating an approximately 21x speedup.

🔬 Measurement:
Run python3 benchmark.py to compare loop vs bytes.translate() implementation.
Run python3 -m unittest discover tests to ensure yEnc unit validation correctness.

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PR created automatically by Jules for task 345521016223502997 started by @xbmc4lyfe

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 0de7ede and b948f85.

📒 Files selected for processing (2)

• .jules/bolt.md
• verify_nzb.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt-yenc-optimize-345521016223502997

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch bolt-yenc-optimize-345521016223502997

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[codacy-production]

Pull Request Overview

This pull request describes a significant performance optimization for yEnc decoding using bytes.translate(), aiming for a 21x speedup. However, the submission currently contains an empty diff, meaning none of the described logic, including the pre-computed translation table and the updated _decode_yenc_lines function, has been uploaded. All acceptance criteria are currently unaddressed, and no functional or performance verification can be performed until the code is provided. Additionally, the Codacy analysis reports 'MissingRequirements' for diff coverage, which is consistent with the lack of code in this submission.

About this PR

• The pull request contains no code changes. The described optimizations using bytes.translate and _yenc_decode_table are missing from the files list. Please ensure the commits are pushed correctly.

Test suggestions

• Decoding a standard yEnc byte string without escape characters
• Decoding yEnc data containing escaped characters (e.g., '=')
• Verification that _yenc_decode_table accurately maps (byte - 42) % 256 for all 256 byte values
• Execution of the benchmark script to confirm the 21x speedup

Prompt proposal for missing tests

Consider implementing these tests if applicable:
1. Decoding a standard yEnc byte string without escape characters
2. Decoding yEnc data containing escaped characters (e.g., '=')
3. Verification that `_yenc_decode_table` accurately maps `(byte - 42) % 256` for all 256 byte values
4. Execution of the benchmark script to confirm the 21x speedup

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes.}