Detect file system errors during downloads.

net/base/mock_file_stream.cc

Index: net/base/mock_file_stream.cc
diff --git a/net/base/mock_file_stream.cc b/net/base/mock_file_stream.cc
new file mode 100755
index 0000000000000000000000000000000000000000..1a8f1b84ff5b84714af1e827af3f74da361ce482
--- /dev/null
+++ b/net/base/mock_file_stream.cc
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/base/mock_file_stream.h"
+
+namespace net {
+
+namespace testing {
+
+int MockFileStream::Open(const FilePath& path, int open_flags) {
+  path_ = path;
+  return ReturnError(net::FileStream::Open(path, open_flags));
+}
+
+int64 MockFileStream::Seek(net::Whence whence, int64 offset) {
+  return ReturnError64(net::FileStream::Seek(whence, offset));
+}
+
+int64 MockFileStream::Available() {
+  return ReturnError64(net::FileStream::Available());
+}
+
+int MockFileStream::Read(char* buf,
+                 int buf_len,
+                 net::CompletionCallback* callback) {
+  return ReturnError(net::FileStream::Read(buf, buf_len, callback));
+}
+
+int MockFileStream::ReadUntilComplete(char *buf, int buf_len) {
+  return ReturnError(net::FileStream::ReadUntilComplete(buf, buf_len));
+}
+
+int MockFileStream::Write(const char* buf,
+                  int buf_len,
+                  net::CompletionCallback* callback) {
+  return ReturnError(net::FileStream::Write(buf, buf_len, callback));
+}
+
+int64 MockFileStream::Truncate(int64 bytes) {
+  return ReturnError64(net::FileStream::Truncate(bytes));
+}
+
+int MockFileStream::Flush() {
+  return ReturnError(net::FileStream::Flush());
+}
+
+}  // namespace testing
+
+}  // namespace net