Add exFAT support (#150)

## Summary

* Swap to updated SDCardManager which uses SdFat
* Add exFAT support
  * Swap to using FsFile everywhere
* Use newly exposed `SdMan` macro to get to static instance of
SDCardManager
* Move a bunch of FsHelpers up to SDCardManager

lib/Xtc/Xtc.cpp

@@ -9,7 +9,7 @@
 
 #include <FsHelpers.h>
 #include <HardwareSerial.h>
-#include <SD.h>
+#include <SDCardManager.h>
 
 bool Xtc::load() {
   Serial.printf("[%lu] [XTC] Loading XTC: %s\n", millis(), filepath.c_str());
@@ -31,12 +31,12 @@ bool Xtc::load() {
 }
 
 bool Xtc::clearCache() const {
-  if (!SD.exists(cachePath.c_str())) {
+  if (!SdMan.exists(cachePath.c_str())) {
     Serial.printf("[%lu] [XTC] Cache does not exist, no action needed\n", millis());
     return true;
   }
 
-  if (!FsHelpers::removeDir(cachePath.c_str())) {
+  if (!SdMan.removeDir(cachePath.c_str())) {
     Serial.printf("[%lu] [XTC] Failed to clear cache\n", millis());
     return false;
   }
@@ -46,17 +46,17 @@ bool Xtc::clearCache() const {
 }
 
 void Xtc::setupCacheDir() const {
-  if (SD.exists(cachePath.c_str())) {
+  if (SdMan.exists(cachePath.c_str())) {
     return;
   }
 
   // Create directories recursively
   for (size_t i = 1; i < cachePath.length(); i++) {
     if (cachePath[i] == '/') {
-      SD.mkdir(cachePath.substr(0, i).c_str());
+      SdMan.mkdir(cachePath.substr(0, i).c_str());
     }
   }
-  SD.mkdir(cachePath.c_str());
+  SdMan.mkdir(cachePath.c_str());
 }
 
 std::string Xtc::getTitle() const {
@@ -106,7 +106,7 @@ std::string Xtc::getCoverBmpPath() const { return cachePath + "/cover.bmp"; }
 
 bool Xtc::generateCoverBmp() const {
   // Already generated
-  if (SD.exists(getCoverBmpPath().c_str())) {
+  if (SdMan.exists(getCoverBmpPath().c_str())) {
     return true;
   }
 
@@ -157,8 +157,8 @@ bool Xtc::generateCoverBmp() const {
   }
 
   // Create BMP file
-  File coverBmp;
-  if (!FsHelpers::openFileForWrite("XTC", getCoverBmpPath(), coverBmp)) {
+  FsFile coverBmp;
+  if (!SdMan.openFileForWrite("XTC", getCoverBmpPath(), coverBmp)) {
     Serial.printf("[%lu] [XTC] Failed to create cover BMP file\n", millis());
     free(pageBuffer);
     return false;

lib/Xtc/Xtc/XtcParser.cpp

@@ -9,6 +9,7 @@
 
 #include <FsHelpers.h>
 #include <HardwareSerial.h>
+#include <SDCardManager.h>
 
 #include <cstring>
 
@@ -33,7 +34,7 @@ XtcError XtcParser::open(const char* filepath) {
   }
 
   // Open file
-  if (!FsHelpers::openFileForRead("XTC", filepath, m_file)) {
+  if (!SdMan.openFileForRead("XTC", filepath, m_file)) {
     m_lastError = XtcError::FILE_NOT_FOUND;
     return m_lastError;
   }
@@ -419,8 +420,8 @@ XtcError XtcParser::loadPageStreaming(uint32_t pageIndex,
 }
 
 bool XtcParser::isValidXtcFile(const char* filepath) {
-  File file = SD.open(filepath, FILE_READ);
-  if (!file) {
+  FsFile file;
+  if (!SdMan.openFileForRead("XTC", filepath, file)) {
     return false;
   }
 

lib/Xtc/Xtc/XtcParser.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <SD.h>
+#include <SdFat.h>
 
 #include <functional>
 #include <memory>
@@ -80,7 +80,7 @@ class XtcParser {
   XtcError getLastError() const { return m_lastError; }
 
  private:
-  File m_file;
+  FsFile m_file;
   bool m_isOpen;
   XtcHeader m_header;
   std::vector<PageInfo> m_pageTable;