Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 112 insertions, 0 deletions

diff --git a/third_party/libwebrtc/rtc_base/system/file_wrapper.h b/third_party/libwebrtc/rtc_base/system/file_wrapper.h
new file mode 100644
index 0000000000..5e1e3d6a16
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/system/file_wrapper.h
@@ -0,0 +1,112 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef RTC_BASE_SYSTEM_FILE_WRAPPER_H_
+#define RTC_BASE_SYSTEM_FILE_WRAPPER_H_
+
+#include <stddef.h>
+#include <stdio.h>
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+// Implementation that can read (exclusive) or write from/to a file.
+
+namespace webrtc {
+
+// This class is a thin wrapper around FILE*. It's main features are that it
+// owns the FILE*, calling fclose on destruction, and that on windows, file
+// names passed to the open methods are always treated as utf-8, regardless of
+// system code page.
+
+// Most of the methods return only a success/fail indication. When needed, an
+// optional argument |int* error| should be added to all methods, in the same
+// way as for the OpenWriteOnly methods.
+class FileWrapper final {
+ public:
+  // Opens a file, in read or write mode. Use the is_open() method on the
+  // returned object to check if the open operation was successful. On failure,
+  // and if `error` is non-null, the system errno value is stored at |*error|.
+  // The file is closed by the destructor.
+  static FileWrapper OpenReadOnly(absl::string_view file_name_utf8);
+  static FileWrapper OpenWriteOnly(absl::string_view file_name_utf8,
+                                   int* error = nullptr);
+
+  FileWrapper() = default;
+
+  // Takes over ownership of `file`, closing it on destruction. Calling with
+  // null `file` is allowed, and results in a FileWrapper with is_open() false.
+  explicit FileWrapper(FILE* file) : file_(file) {}
+  ~FileWrapper() { Close(); }
+
+  // Copying is not supported.
+  FileWrapper(const FileWrapper&) = delete;
+  FileWrapper& operator=(const FileWrapper&) = delete;
+
+  // Support for move semantics.
+  FileWrapper(FileWrapper&&);
+  FileWrapper& operator=(FileWrapper&&);
+
+  // Returns true if a file has been opened. If the file is not open, no methods
+  // but is_open and Close may be called.
+  bool is_open() const { return file_ != nullptr; }
+
+  // Closes the file, and implies Flush. Returns true on success, false if
+  // writing buffered data fails. On failure, the file is nevertheless closed.
+  // Calling Close on an already closed file does nothing and returns success.
+  bool Close();
+
+  // Releases and returns the wrapped file without closing it. This call passes
+  // the ownership of the file to the caller, and the wrapper is no longer
+  // responsible for closing it. Similarly the previously wrapped file is no
+  // longer available for the wrapper to use in any aspect.
+  FILE* Release();
+
+  // Write any buffered data to the underlying file. Returns true on success,
+  // false on write error. Note: Flushing when closing, is not required.
+  bool Flush();
+
+  // Seeks to the beginning of file. Returns true on success, false on failure,
+  // e.g., if the underlying file isn't seekable.
+  bool Rewind() { return SeekTo(0); }
+  // TODO(nisse): The seek functions are used only by the WavReader. If that
+  // code is demoted to test code, seek functions can be deleted from this
+  // utility.
+  // Seek relative to current file position.
+  bool SeekRelative(int64_t offset);
+  // Seek to given position.
+  bool SeekTo(int64_t position);
+
+  // Returns the file size or -1 if a size could not be determined.
+  // (A file size might not exists for non-seekable files or file-like
+  // objects, for example /dev/tty on unix.)
+  long FileSize();
+
+  // Returns number of bytes read. Short count indicates EOF or error.
+  size_t Read(void* buf, size_t length);
+
+  // If the most recent Read() returned a short count, this methods returns true
+  // if the short count was due to EOF, and false it it was due to some i/o
+  // error.
+  bool ReadEof() const;
+
+  // Returns true if all data was successfully written (or buffered), or false
+  // if there was an error. Writing buffered data can fail later, and is
+  // reported with return value from Flush or Close.
+  bool Write(const void* buf, size_t length);
+
+ private:
+  FILE* file_ = nullptr;
+};
+
+}  // namespace webrtc
+
+#endif  // RTC_BASE_SYSTEM_FILE_WRAPPER_H_