Add net to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 112 insertions, 0 deletions

diff --git a/net/disk_cache/file.h b/net/disk_cache/file.h
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+++ b/net/disk_cache/file.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// See net/disk_cache/disk_cache.h for the public interface of the cache.
+
+#ifndef NET_DISK_CACHE_FILE_H__
+#define NET_DISK_CACHE_FILE_H__
+
+#include "base/ref_counted.h"
+
+namespace disk_cache {
+
+// This interface is used to support asynchronous ReadData and WriteData calls.
+class FileIOCallback {
+ public:
+  // Notified of the actual number of bytes read or written. This value is
+  // negative if an error occurred.
+  virtual void OnFileIOComplete(int bytes_copied) = 0;
+};
+
+// Simple wrapper around a file that allows asynchronous operations.
+class File : public base::RefCounted<File> {
+  friend class base::RefCounted<File>;
+ public:
+  File() : init_(false), mixed_(false) {}
+  // mixed_mode set to true enables regular synchronous operations for the file.
+  explicit File(bool mixed_mode) : init_(false), mixed_(mixed_mode) {}
+
+  // Initializes the object to point to a given file. The file must aready exist
+  // on disk, and allow shared read and write.
+  bool Init(const std::wstring name);
+
+#ifdef WIN32
+  HANDLE handle() const {
+    return handle_;
+  }
+#else
+  int file_descriptor() const {
+    return file_descriptor_;
+  }
+#endif
+
+  // Performs synchronous IO.
+  bool Read(void* buffer, size_t buffer_len, size_t offset);
+  bool Write(const void* buffer, size_t buffer_len, size_t offset);
+
+  // Performs asynchronous IO. callback will be called when the IO completes,
+  // as an APC on the thread that queued the operation.
+  bool Read(void* buffer, size_t buffer_len, size_t offset,
+            FileIOCallback* callback, bool* completed);
+  bool Write(const void* buffer, size_t buffer_len, size_t offset,
+             FileIOCallback* callback, bool* completed);
+
+  // Performs asynchronous writes, but doesn't notify when done. Automatically
+  // deletes buffer when done.
+  bool PostWrite(const void* buffer, size_t buffer_len, size_t offset);
+
+  // Sets the file's length. The file is truncated or extended with zeros to
+  // the new length.
+  bool SetLength(size_t length);
+  size_t GetLength();
+
+ protected:
+  virtual ~File();
+
+  // Performs the actual asynchronous write. If notify is set and there is no
+  // callback, the call will be re-synchronized.
+  bool AsyncWrite(const void* buffer, size_t buffer_len, size_t offset,
+                  bool notify, FileIOCallback* callback, bool* completed);
+
+ private:
+  bool init_;
+  bool mixed_;
+#ifdef WIN32
+  HANDLE handle_;  // Regular, asynchronous IO handle.
+  HANDLE sync_handle_;  // Synchronous IO hanlde.
+#else
+  int file_descriptor_;
+#endif
+
+  DISALLOW_EVIL_CONSTRUCTORS(File);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_FILE_H__