Switch over to the google3 unix_file File*.
I also moved macros.h to base/macros.h to ease google3 porting, at
the expense of a larger than necessary change. (I learned my lesson,
though, and didn't make the equivalent base/logging.h change.)
I'm not sure whether we want to keep the unix_file MappedFile given
our existing MemMap, but it's easier to bring it over and then remove
it (and possibly revert the removal) than to bring it over later.
Change-Id: Id50a66faa5ab17b9bc936cc9043dbc26f791f0ca
diff --git a/src/base/unix_file/fd_file.h b/src/base/unix_file/fd_file.h
new file mode 100644
index 0000000..2b33961
--- /dev/null
+++ b/src/base/unix_file/fd_file.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * 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 BASE_UNIX_FILE_FD_FILE_H_
+#define BASE_UNIX_FILE_FD_FILE_H_
+
+#include <fcntl.h>
+#include <string>
+#include "base/unix_file/random_access_file.h"
+#include "base/macros.h"
+
+namespace unix_file {
+
+// A RandomAccessFile implementation backed by a file descriptor.
+//
+// Not thread safe.
+class FdFile : public RandomAccessFile {
+ public:
+ FdFile();
+ // Creates an FdFile using the given file descriptor. Takes ownership of the
+ // file descriptor. (Use DisableAutoClose to retain ownership.)
+ explicit FdFile(int fd);
+ explicit FdFile(int fd, const std::string& path);
+
+ // Destroys an FdFile, closing the file descriptor if Close hasn't already
+ // been called. (If you care about the return value of Close, call it
+ // yourself; this is meant to handle failure cases and read-only accesses.
+ // Note though that calling Close and checking its return value is still no
+ // guarantee that data actually made it to stable storage.)
+ virtual ~FdFile();
+
+ // Opens file 'file_path' using 'flags' and 'mode'.
+ bool Open(const std::string& file_path, int flags);
+ bool Open(const std::string& file_path, int flags, mode_t mode);
+
+ // RandomAccessFile API.
+ virtual int Close();
+ virtual int64_t Read(char* buf, int64_t byte_count, int64_t offset) const;
+ virtual int SetLength(int64_t new_length);
+ virtual int64_t GetLength() const;
+ virtual int64_t Write(const char* buf, int64_t byte_count, int64_t offset);
+ virtual int Flush();
+
+ // Bonus API.
+ int Fd() const;
+ bool IsOpened() const;
+ std::string GetPath() const;
+ void DisableAutoClose();
+ bool ReadFully(void* buffer, int64_t byte_count);
+ bool WriteFully(const void* buffer, int64_t byte_count);
+
+ private:
+ int fd_;
+ std::string file_path_;
+ bool auto_close_;
+
+ DISALLOW_COPY_AND_ASSIGN(FdFile);
+};
+
+} // namespace unix_file
+
+#endif // BASE_UNIX_FILE_FD_FILE_H_