Bugfix fs read+speed improvements (#125)

* Revert "Edited VFSFileImpl::read to use both read/fread (espressif#6456)"

This reverts commit 7b89b39.

* Added default file buffer size + function to change it by user

Co-authored-by: Jan Procházka <[email protected]>

Author: Jason2866

Diff for: libraries/FS/src/FS.cpp

@@ -130,6 +130,15 @@ size_t File::size() const
     return _p->size();
 }
 
+bool File::setBufferSize(size_t size)
+{
+    if (!*this) {
+        return 0;
+    }
+
+    return _p->setBufferSize(size);
+}
+
 void File::close()
 {
     if (_p) {

Diff for: libraries/FS/src/FS.h

@@ -70,6 +70,7 @@ class File : public Stream
     }
     size_t position() const;
     size_t size() const;
+    bool setBufferSize(size_t size);
     void close();
     operator bool() const;
     time_t getLastWrite();

Diff for: libraries/FS/src/FSImpl.h

@@ -36,6 +36,7 @@ class FileImpl
     virtual bool seek(uint32_t pos, SeekMode mode) = 0;
     virtual size_t position() const = 0;
     virtual size_t size() const = 0;
+    virtual bool setBufferSize(size_t size) = 0;
     virtual void close() = 0;
     virtual time_t getLastWrite() = 0;
     virtual const char* path() const = 0;

Diff for: libraries/FS/src/vfs_api.h

@@ -65,10 +65,11 @@ class VFSFileImpl : public FileImpl
     bool        seek(uint32_t pos, SeekMode mode) override;
     size_t      position() const override;
     size_t      size() const override;
+    bool        setBufferSize(size_t size);
     void        close() override;
     const char* path() const override;
     const char* name() const override;
-    time_t getLastWrite()  override;
+    time_t      getLastWrite()  override;
     boolean     isDirectory(void) override;
     FileImplPtr openNextFile(const char* mode) override;
     void        rewindDirectory(void) override;