1 files changed, 135 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/system/file_wrapper.cc b/third_party/libwebrtc/rtc_base/system/file_wrapper.cc
new file mode 100644
index 0000000000..af34d0e411
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/system/file_wrapper.cc
@@ -0,0 +1,135 @@
+/*
+ *  Copyright (c) 2012 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.
+ */
+
+#include "rtc_base/system/file_wrapper.h"
+
+#include <stddef.h>
+
+#include <cerrno>
+#include <cstdint>
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/numerics/safe_conversions.h"
+
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#endif
+
+#include <utility>
+
+namespace webrtc {
+namespace {
+FILE* FileOpen(absl::string_view file_name_utf8, bool read_only, int* error) {
+  RTC_CHECK_EQ(file_name_utf8.find_first_of('\0'), absl::string_view::npos)
+      << "Invalid filename, containing NUL character";
+  std::string file_name(file_name_utf8);
+#if defined(_WIN32)
+  int len = MultiByteToWideChar(CP_UTF8, 0, file_name.c_str(), -1, nullptr, 0);
+  std::wstring wstr(len, 0);
+  MultiByteToWideChar(CP_UTF8, 0, file_name.c_str(), -1, &wstr[0], len);
+  FILE* file = _wfopen(wstr.c_str(), read_only ? L"rb" : L"wb");
+#else
+  FILE* file = fopen(file_name.c_str(), read_only ? "rb" : "wb");
+#endif
+  if (!file && error) {
+    *error = errno;
+  }
+  return file;
+}
+
+}  // namespace
+
+// static
+FileWrapper FileWrapper::OpenReadOnly(absl::string_view file_name_utf8) {
+  return FileWrapper(FileOpen(file_name_utf8, true, nullptr));
+}
+
+// static
+FileWrapper FileWrapper::OpenWriteOnly(absl::string_view file_name_utf8,
+                                       int* error /*=nullptr*/) {
+  return FileWrapper(FileOpen(file_name_utf8, false, error));
+}
+
+FileWrapper::FileWrapper(FileWrapper&& other) {
+  operator=(std::move(other));
+}
+
+FileWrapper& FileWrapper::operator=(FileWrapper&& other) {
+  Close();
+  file_ = other.file_;
+  other.file_ = nullptr;
+  return *this;
+}
+
+bool FileWrapper::SeekRelative(int64_t offset) {
+  RTC_DCHECK(file_);
+  return fseek(file_, rtc::checked_cast<long>(offset), SEEK_CUR) == 0;
+}
+
+bool FileWrapper::SeekTo(int64_t position) {
+  RTC_DCHECK(file_);
+  return fseek(file_, rtc::checked_cast<long>(position), SEEK_SET) == 0;
+}
+
+long FileWrapper::FileSize() {
+  if (file_ == nullptr)
+    return -1;
+  long original_position = ftell(file_);
+  if (original_position < 0)
+    return -1;
+  int seek_error = fseek(file_, 0, SEEK_END);
+  if (seek_error)
+    return -1;
+  long file_size = ftell(file_);
+  seek_error = fseek(file_, original_position, SEEK_SET);
+  if (seek_error)
+    return -1;
+  return file_size;
+}
+
+bool FileWrapper::Flush() {
+  RTC_DCHECK(file_);
+  return fflush(file_) == 0;
+}
+
+size_t FileWrapper::Read(void* buf, size_t length) {
+  RTC_DCHECK(file_);
+  return fread(buf, 1, length, file_);
+}
+
+bool FileWrapper::ReadEof() const {
+  RTC_DCHECK(file_);
+  return feof(file_);
+}
+
+bool FileWrapper::Write(const void* buf, size_t length) {
+  RTC_DCHECK(file_);
+  return fwrite(buf, 1, length, file_) == length;
+}
+
+bool FileWrapper::Close() {
+  if (file_ == nullptr)
+    return true;
+
+  bool success = fclose(file_) == 0;
+  file_ = nullptr;
+  return success;
+}
+
+FILE* FileWrapper::Release() {
+  FILE* file = file_;
+  file_ = nullptr;
+  return file;
+}
+
+}  // namespace webrtc