Add FS, SD and SD_MMC (#256)

libraries/FS/src/vfs_api.h

@@ -0,0 +1,76 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef vfs_api_h
+#define vfs_api_h
+
+#include "FS.h"
+#include "FSImpl.h"
+
+extern "C" {
+#include <sys/unistd.h>
+#include <sys/stat.h>
+#include <dirent.h>
+}
+
+using namespace fs;
+
+class VFSFileImpl;
+
+class VFSImpl : public FSImpl
+{
+
+protected:
+    friend class VFSFileImpl;
+
+public:
+    FileImplPtr open(const char* path, const char* mode) override;
+    bool        exists(const char* path) override;
+    bool        rename(const char* pathFrom, const char* pathTo) override;
+    bool        remove(const char* path) override;
+    bool        mkdir(const char *path) override;
+    bool        rmdir(const char *path) override;
+};
+
+class VFSFileImpl : public FileImpl
+{
+protected:
+    VFSImpl*            _fs;
+    FILE *              _f;
+    DIR *               _d;
+    char *              _path;
+    bool                _isDirectory;
+    mutable struct stat _stat;
+    mutable bool        _written;
+
+    void _getStat() const;
+
+public:
+    VFSFileImpl(VFSImpl* fs, const char* path, const char* mode);
+    ~VFSFileImpl() override;
+    size_t      write(const uint8_t *buf, size_t size) override;
+    size_t      read(uint8_t* buf, size_t size) override;
+    void        flush() override;
+    bool        seek(uint32_t pos, SeekMode mode) override;
+    size_t      position() const override;
+    size_t      size() const override;
+    void        close() override;
+    const char* name() const override;
+    boolean     isDirectory(void) override;
+    FileImplPtr openNextFile(const char* mode) override;
+    void        rewindDirectory(void) override;
+    operator    bool();
+};
+
+#endif