Files
crosspoint-reader-mod/lib
Zach Nelson c3f1dbfa09 perf: Avoid creating strings for file extension checks (#1303)
## Summary

**What is the goal of this PR?**

This change avoids the pattern of creating a `std::string` using
`.substr` in order to compare against a file extension literal.
```c++
std::string path;
if (path.length() >= 4 && path.substr(path.length() - 4) == ".ext")
```

The `checkFileExtension` utility has moved from StringUtils to
FsHelpers, to be available to code in lib/. The signature now accepts a
`std::string_view` instead of `std::string`, which makes the single
implementation reusable for Arduino `String`.

Added utility functions for commonly repeated extensions.

These changes **save about 2 KB of flash (5,999,427 to 5,997,343)**.

---

### AI Usage

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Did you use AI tools to help write this code? _**NO**_
2026-03-05 10:12:22 -06:00
..
2025-12-21 17:15:17 +11:00
2025-12-03 22:06:45 +11:00

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