Merge branch 'feat-sdcard-info' of https://github.com/jpirnay/crosspoint-reader into mybuild

lib/hal/HalStorage.cpp

@@ -4,6 +4,7 @@
 #include <FS.h>  // need to be included before SdFat.h for compatibility with FS.h's File class
 #include <Logging.h>
 #include <SDCardManager.h>
+#include <SdFat.h>
 
 #include <cassert>
 
@@ -11,6 +12,9 @@
 
 HalStorage HalStorage::instance;
 
+// Local SdFat instance for volume stats only
+static SdFat halStorageSdFat;
+
 HalStorage::HalStorage() {
   storageMutex = xSemaphoreCreateMutex();
   assert(storageMutex != nullptr);
@@ -54,6 +58,36 @@ bool HalStorage::writeFile(const char* path, const String& content) {
 
 bool HalStorage::ensureDirectoryExists(const char* path) { HAL_STORAGE_WRAPPED_CALL(ensureDirectoryExists, path); }
 
+uint64_t HalStorage::sdTotalBytes() const {
+  StorageLock lock;
+  // Try to initialize if not already
+  if (!halStorageSdFat.begin()) return 0;
+  auto* vol = halStorageSdFat.vol();
+  if (!vol) return 0;
+  return (uint64_t)vol->clusterCount() * vol->bytesPerCluster();
+}
+
+uint64_t HalStorage::sdUsedBytes() const {
+  StorageLock lock;
+  if (!halStorageSdFat.begin()) return 0;
+  auto* vol = halStorageSdFat.vol();
+  if (!vol) return 0;
+  const int32_t freeClusters = vol->freeClusterCount();
+  if (freeClusters < 0) return 0;  // error reading FAT
+  const uint64_t clusterCount = vol->clusterCount();
+  uint64_t cappedFreeClusters = freeClusters < 0 ? 0 : (uint64_t)freeClusters;
+  if (cappedFreeClusters > clusterCount) cappedFreeClusters = clusterCount;
+  const uint64_t bytesPerCluster = vol->bytesPerCluster();
+  return (clusterCount - cappedFreeClusters) * bytesPerCluster;
+}
+
+uint64_t HalStorage::sdFreeBytes() const {
+  uint64_t total = sdTotalBytes();
+  uint64_t used = sdUsedBytes();
+  if (total <= used) return 0;
+  return total - used;
+}
+
 class HalFile::Impl {
  public:
   Impl(FsFile&& fsFile) : file(std::move(fsFile)) {}