Add IpHeadersSlice and IpSlice::header()

[xyzzyz]

Introduce IpHeadersSlice as an enum over Ipv4HeaderSlice and Ipv6HeaderSlice, with convenience accessors and conversion to IpHeaders.

Add IpSlice::header() to that returns IpHeadersSlice. Add IpSlice::to_header that returns IpHeaders

Summary by CodeRabbit

• New Features

  • Enhanced IP header access and manipulation capabilities with unified handling for IPv4 and IPv6 variants.
  • Improved conversion utilities for seamless transformation between header representations.

• Tests

  • Comprehensive test coverage for header operations, including round-trip validation and cross-variant consistency checks.

[JulianSchmid]

@coderabbitai review

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a68052f8-3106-4f29-9d65-1a4b80ac9a39

📥 Commits

Reviewing files that changed from the base of the PR and between bcc669d and 1f5ef52.

📒 Files selected for processing (3)

• etherparse/src/net/ip_headers_slice.rs
• etherparse/src/net/ip_slice.rs
• etherparse/src/net/mod.rs

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📝 Walkthrough

Walkthrough

A new IpHeadersSlice enum is introduced to represent IPv4/IPv6 base headers with their respective extension headers. The enum provides comprehensive accessors for source address, destination address, and header metadata, along with conversion methods. Two methods are added to IpSlice to expose this interface through header() and to_header(). The new module is properly registered and exported.

Changes

Cohort / File(s)	Summary
New IP Headers Slice Module etherparse/src/net/ip_headers_slice.rs	Introduces IpHeadersSlice<'a> enum with IPv4 and IPv6 variants, each paired with their extension headers. Provides accessor methods for header fields (source/destination addresses, next header, version, length) and try_to_header() conversion. Includes comprehensive unit tests for both IPv4 and IPv6 paths.
IP Slice Methods etherparse/src/net/ip_slice.rs	Adds header() method to extract IpHeadersSlice from an IpSlice, and to_header() method to convert back to IpHeaders. Extensive test coverage includes round-trip validation and coherence checks for both IPv4 and IPv6 variants using unit and property-based tests.
Module Registration etherparse/src/net/mod.rs	Declares and re-exports the new ip_headers_slice module, making IpHeadersSlice and related types publicly accessible through the net module namespace.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 New slices dancing, headers bright,
IPv4 and IPv6 in flight,
Accessors hop and converters play,
Extensions bundled every way! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main changes: introduction of IpHeadersSlice and the header() method on IpSlice.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

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• Create PR with unit tests
• Post copyable unit tests in a comment

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (bcc669d) to head (1f5ef52).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@      Coverage Diff      @@
##   master   #136   +/-   ##
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