[freenos] r347 committed - Implemented FileStorage, which simply uses a file as Storage provider.

From: codesite-noreply@xxxxxxxxxx
To: freenos@xxxxxxxxxxxxx
Date: Fri, 04 Sep 2009 22:57:13 +0000
Revision: 347
Author: nieklinnenbank
Date: Fri Sep  4 15:50:53 2009
Log: Implemented FileStorage, which simply uses a file as Storage provider.

http://code.google.com/p/freenos/source/detail?r=347

Added:
 /trunk/srv/filesystem/FileStorage.h

=======================================
--- /dev/null
+++ /trunk/srv/filesystem/FileStorage.h Fri Sep  4 15:50:53 2009
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2009 Niek Linnenbank
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __FILESYSTEM_FILESTORAGE_H
+#define __FILESYSTEM_FILESTORAGE_H
+
+#include <Types.h>
+#include <Error.h>
+#include "Storage.h"
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+/**
+ * @brief Use a file as Storage provider.
+ * @see Storage
+ */
+class FileStorage : public Storage
+{
+    public:
+
+       /**
+        * @brief Constructor function.
+        * @param path Full path to the file to use.
+        */
+       FileStorage(const char *path)
+       {
+           file = open(path, O_RDWR);
+           stat(path, &st);
+       }
+
+       /**
+        * @brief Destructor function.
+        */
+       ~FileStorage()
+       {
+           close(file);
+       }
+
+       /**
+        * Read a contigeous set of data.
+        * @param offset Offset to start reading from.
+        * @param buffer Output buffer.
+        * @param size Number of bytes to copied.
+        */
+       virtual Error read(u64 offset, void *buffer, Size size)
+       {
+           int result;
+
+           if (file >= 0)
+           {
+               lseek(file, offset, SEEK_SET);
+               result = ::read(file, buffer, size);
+
+               return result >= 0 ? result : errno;
+           }
+           else
+               return errno;
+       }
+
+       /**
+        * Write a contigeous set of data.
+        * @param offset Offset to start writing to.
+        * @param buffer Input buffer.
+        * @param size Number of bytes to written.
+        */
+       Error write(u64 offset, void *buffer, Size size)
+       {
+           int result;
+
+           if (file >= 0)
+           {
+               lseek(file, offset, SEEK_SET);
+               result = ::write(file, buffer, size);
+
+               return result >= 0 ? result : errno;
+           }
+           else
+               return errno;
+       }
+
+       /**
+        * Retrieve maximum storage capacity.
+        * @return Storage capacity.
+        */
+       u64 capacity()
+       {
+           return st.st_size;
+       }
+
+    private:
+
+       /** @brief File descriptor of the file for Storage I/O. */
+       int file;
+
+       /** @brief Status of the file for Storage I/O. */
+       struct stat st;
+};
+
+#endif /* __FILESYSTEM_STORAGE_H */
[freenos] r347 committed - Implemented FileStorage, which simply uses a file as Storage provider.

Other related posts:
