From d8b1fc81c03439d728f1cd469035e22a2f0380df Mon Sep 17 00:00:00 2001
From: lbernstone <lbernstone@gmail.com>
Date: Sat, 14 Nov 2020 23:48:21 -0700
Subject: [PATCH] Added usedBytes to match other filesystems (#4534)

---
 libraries/FFat/src/FFat.cpp | 15 +++++++++++++++
 libraries/FFat/src/FFat.h   |  1 +
 2 files changed, 16 insertions(+)

diff --git a/libraries/FFat/src/FFat.cpp b/libraries/FFat/src/FFat.cpp
index 0d2b2cb26..6441dfca4 100644
--- a/libraries/FFat/src/FFat.cpp
+++ b/libraries/FFat/src/FFat.cpp
@@ -135,6 +135,21 @@ size_t F_Fat::totalBytes()
     return tot_sect * sect_size;
 }
 
+size_t F_Fat::usedBytes()
+{
+    FATFS *fs;
+    DWORD free_clust, used_sect, sect_size;
+
+    BYTE pdrv = ff_diskio_get_pdrv_wl(_wl_handle);
+    char drv[3] = {(char)(48+pdrv), ':', 0};
+    if ( f_getfree(drv, &free_clust, &fs) != FR_OK){
+        return 0;
+    }
+    used_sect = (fs->n_fatent - 2 - free_clust) * fs->csize;
+    sect_size = CONFIG_WL_SECTOR_SIZE;
+    return used_sect * sect_size;
+}
+
 size_t F_Fat::freeBytes()
 {
 
diff --git a/libraries/FFat/src/FFat.h b/libraries/FFat/src/FFat.h
index a32c950bb..ed20e23b2 100644
--- a/libraries/FFat/src/FFat.h
+++ b/libraries/FFat/src/FFat.h
@@ -31,6 +31,7 @@ public:
     bool begin(bool formatOnFail=false, const char * basePath="/ffat", uint8_t maxOpenFiles=10, const char * partitionLabel = (char*)FFAT_PARTITION_LABEL);
     bool format(bool full_wipe = FFAT_WIPE_QUICK, char* partitionLabel = (char*)FFAT_PARTITION_LABEL);
     size_t totalBytes();
+    size_t usedBytes();
     size_t freeBytes();
     void end();
     bool exists(const char* path);
-- 
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