Adding sectorsize() and numSectors() to SD (espressif#6457)

* Update SD.h

* Added numSectors() and sectorSize()

Author: tobozo

libraries/SD/src/SD.cpp

@@ -75,6 +75,22 @@ uint64_t SDFS::cardSize()
     return (uint64_t)sectors * sectorSize;
 }
 
+size_t SDFS::numSectors()
+{
+    if(_pdrv == 0xFF) {
+        return 0;
+    }
+    return sdcard_num_sectors(_pdrv);
+}
+
+size_t SDFS::sectorSize()
+{
+    if(_pdrv == 0xFF) {
+        return 0;
+    }
+    return sdcard_sector_size(_pdrv);
+}
+
 uint64_t SDFS::totalBytes()
 {
 	FATFS* fsinfo;

libraries/SD/src/SD.h

@@ -32,6 +32,8 @@ class SDFS : public FS
     void end();
     sdcard_type_t cardType();
     uint64_t cardSize();
+    size_t numSectors();
+    size_t sectorSize();
     uint64_t totalBytes();
     uint64_t usedBytes();
     bool readRAW(uint8_t* buffer, uint32_t sector);