Fix content range for itag-18

[t6fb3m59]

Currently we report the chunk size as the size of the entire file. This changes it to clen with a fallback to content length just in case.

Related: TeamPiped/Piped#4244

The code was written with Claude and reviewed by me.

Summary by CodeRabbit

• Bug Fixes
  • Improved range response correction with enhanced content-length determination logic and fallback header parsing for more reliable partial content handling.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d43f74a6-f797-4427-acf8-f323f7490e0f

📥 Commits

Reviewing files that changed from the base of the PR and between e8955bb and 17d9f41.

📒 Files selected for processing (1)

• src/main.rs

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📝 Walkthrough

Walkthrough

The handle_range_response_correction function signature is updated to accept an optional clen: Option<u64> parameter. The total_size computation logic now prefers the provided clen value when present and positive, otherwise falls back to parsing content-length from upstream response headers. The call site at line 492 is updated to pass clen as an argument.

Changes

Range Response Correction with Explicit Content Length

Layer / File(s)	Summary
Range response correction with explicit content length src/main.rs	Function signature adds clen: Option<u64> parameter. Logic prioritizes provided clen for total_size computation over header parsing. Call site passes clen argument.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A content-length passed straight and true,
No parsing headers when I have you!
One parameter flows from call to core—
Range responses work better than before! 📦

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Fix content range for itag-18' clearly and concisely summarizes the main change: correcting how content-range headers are handled for itag-18 responses.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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