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perf: Avoid creating strings for file extension checks (#1303)

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## 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

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**NO**_
This commit is contained in:
Zach Nelson
2026-03-05 10:12:22 -06:00
committed by GitHub
parent ea88797c8e
commit c3f1dbfa09
19 changed files with 160 additions and 151 deletions
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15
lib/Txt/Txt.cpp
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@@ -41,7 +41,7 @@ std::string Txt::getTitle() const {
std::string filename = (lastSlash != std::string::npos) ? filepath.substr(lastSlash + 1) : filepath;
// Remove .txt extension
if (filename.length() >= 4 && filename.substr(filename.length() - 4) == ".txt") {
if (FsHelpers::hasTxtExtension(filename)) {
filename = filename.substr(0, filename.length() - 4);
}
@@ -112,14 +112,7 @@ bool Txt::generateCoverBmp() const {
// Setup cache directory
setupCacheDir();
// Get file extension
const size_t len = coverImagePath.length();
const bool isJpg =
(len >= 4 && (coverImagePath.substr(len - 4) == ".jpg" || coverImagePath.substr(len - 4) == ".JPG")) ||
(len >= 5 && (coverImagePath.substr(len - 5) == ".jpeg" || coverImagePath.substr(len - 5) == ".JPEG"));
const bool isBmp = len >= 4 && (coverImagePath.substr(len - 4) == ".bmp" || coverImagePath.substr(len - 4) == ".BMP");
if (isBmp) {
if (FsHelpers::hasBmpExtension(coverImagePath)) {
// Copy BMP file to cache
LOG_DBG("TXT", "Copying BMP cover image to cache");
FsFile src, dst;
@@ -139,9 +132,7 @@ bool Txt::generateCoverBmp() const {
dst.close();
LOG_DBG("TXT", "Copied BMP cover to cache");
return true;
}
if (isJpg) {
} else if (FsHelpers::hasJpgExtension(coverImagePath)) {
// Convert JPG/JPEG to BMP (same approach as Epub)
LOG_DBG("TXT", "Generating BMP from JPG cover image");
FsFile coverJpg, coverBmp;