Remove //net (except for Android test stuff) and sdch

net/base/file_stream_context.h

-// Copyright (c) 2012 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.
-
-// This file defines FileStream::Context class.
-// The general design of FileStream is as follows: file_stream.h defines
-// FileStream class which basically is just an "wrapper" not containing any
-// specific implementation details. It re-routes all its method calls to
-// the instance of FileStream::Context (FileStream holds a scoped_ptr to
-// FileStream::Context instance). Context was extracted into a different class
-// to be able to do and finish all async operations even when FileStream
-// instance is deleted. So FileStream's destructor can schedule file
-// closing to be done by Context in WorkerPool (or the TaskRunner passed to
-// constructor) and then just return (releasing Context pointer from
-// scoped_ptr) without waiting for actual closing to complete.
-// Implementation of FileStream::Context is divided in two parts: some methods
-// and members are platform-independent and some depend on the platform. This
-// header file contains the complete definition of Context class including all
-// platform-dependent parts (because of that it has a lot of #if-#else
-// branching). Implementations of all platform-independent methods are
-// located in file_stream_context.cc, and all platform-dependent methods are
-// in file_stream_context_{win,posix}.cc. This separation provides better
-// readability of Context's code. And we tried to make as much Context code
-// platform-independent as possible. So file_stream_context_{win,posix}.cc are
-// much smaller than file_stream_context.cc now.
-
-#ifndef NET_BASE_FILE_STREAM_CONTEXT_H_
-#define NET_BASE_FILE_STREAM_CONTEXT_H_
-
-#include "base/files/file.h"
-#include "base/memory/weak_ptr.h"
-#include "base/message_loop/message_loop.h"
-#include "base/move.h"
-#include "base/task_runner.h"
-#include "net/base/completion_callback.h"
-#include "net/base/file_stream.h"
-
-#if defined(OS_POSIX)
-#include <errno.h>
-#endif
-
-namespace base {
-class FilePath;
-}
-
-namespace net {
-
-class IOBuffer;
-
-#if defined(OS_WIN)
-class FileStream::Context : public base::MessageLoopForIO::IOHandler {
-#elif defined(OS_POSIX)
-class FileStream::Context {
-#endif
- public:
-  ////////////////////////////////////////////////////////////////////////////
-  // Platform-dependent methods implemented in
-  // file_stream_context_{win,posix}.cc.
-  ////////////////////////////////////////////////////////////////////////////
-
-  explicit Context(const scoped_refptr<base::TaskRunner>& task_runner);
-  Context(base::File file, const scoped_refptr<base::TaskRunner>& task_runner);
-#if defined(OS_WIN)
-  virtual ~Context();
-#elif defined(OS_POSIX)
-  ~Context();
-#endif
-
-  int Read(IOBuffer* buf,
-           int buf_len,
-           const CompletionCallback& callback);
-
-  int Write(IOBuffer* buf,
-            int buf_len,
-            const CompletionCallback& callback);
-
-  const base::File& file() const { return file_; }
-  bool async_in_progress() const { return async_in_progress_; }
-
-  ////////////////////////////////////////////////////////////////////////////
-  // Platform-independent methods implemented in file_stream_context.cc.
-  ////////////////////////////////////////////////////////////////////////////
-
-  // Destroys the context. It can be deleted in the method or deletion can be
-  // deferred if some asynchronous operation is now in progress or if file is
-  // not closed yet.
-  void Orphan();
-
-  void Open(const base::FilePath& path,
-            int open_flags,
-            const CompletionCallback& callback);
-
-  void Close(const CompletionCallback& callback);
-
-  void Seek(base::File::Whence whence,
-            int64 offset,
-            const Int64CompletionCallback& callback);
-
-  void Flush(const CompletionCallback& callback);
-
- private:
-  struct IOResult {
-    IOResult();
-    IOResult(int64 result, logging::SystemErrorCode os_error);
-    static IOResult FromOSError(logging::SystemErrorCode os_error);
-
-    int64 result;
-    logging::SystemErrorCode os_error;  // Set only when result < 0.
-  };
-
-  struct OpenResult {
-    MOVE_ONLY_TYPE_FOR_CPP_03(OpenResult, RValue)
-   public:
-    OpenResult();
-    OpenResult(base::File file, IOResult error_code);
-    // C++03 move emulation of this type.
-    OpenResult(RValue other);
-    OpenResult& operator=(RValue other);
-
-    base::File file;
-    IOResult error_code;
-  };
-
-  ////////////////////////////////////////////////////////////////////////////
-  // Platform-independent methods implemented in file_stream_context.cc.
-  ////////////////////////////////////////////////////////////////////////////
-
-  OpenResult OpenFileImpl(const base::FilePath& path, int open_flags);
-
-  IOResult CloseFileImpl();
-
-  IOResult FlushFileImpl();
-
-  void OnOpenCompleted(const CompletionCallback& callback,
-                       OpenResult open_result);
-
-  void CloseAndDelete();
-
-  Int64CompletionCallback IntToInt64(const CompletionCallback& callback);
-
-  // Called when Open() or Seek() completes. |result| contains the result or a
-  // network error code.
-  void OnAsyncCompleted(const Int64CompletionCallback& callback,
-                        const IOResult& result);
-
-  ////////////////////////////////////////////////////////////////////////////
-  // Platform-dependent methods implemented in
-  // file_stream_context_{win,posix}.cc.
-  ////////////////////////////////////////////////////////////////////////////
-
-  // Adjusts the position from where the data is read.
-  IOResult SeekFileImpl(base::File::Whence whence, int64 offset);
-
-  void OnFileOpened();
-
-#if defined(OS_WIN)
-  void IOCompletionIsPending(const CompletionCallback& callback, IOBuffer* buf);
-
-  // Implementation of MessageLoopForIO::IOHandler.
-  virtual void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
-                             DWORD bytes_read,
-                             DWORD error) override;
-
-  // Invokes the user callback.
-  void InvokeUserCallback();
-
-  // Deletes an orphaned context.
-  void DeleteOrphanedContext();
-
-  // The ReadFile call on Windows can execute synchonously at times.
-  // http://support.microsoft.com/kb/156932. This ends up blocking the calling
-  // thread which is undesirable. To avoid this we execute the ReadFile call
-  // on a worker thread.
-  // The |context| parameter is a pointer to the current Context instance. It
-  // is safe to pass this as is to the pool as the Context instance should
-  // remain valid until the pending Read operation completes.
-  // The |file| parameter is the handle to the file being read.
-  // The |buf| parameter is the buffer where we want the ReadFile to read the
-  // data into.
-  // The |buf_len| parameter contains the number of bytes to be read.
-  // The |overlapped| parameter is a pointer to the OVERLAPPED structure being
-  // used.
-  // The |origin_thread_loop| is a MessageLoopProxy instance used to post tasks
-  // back to the originating thread.
-  static void ReadAsync(
-      FileStream::Context* context,
-      HANDLE file,
-      scoped_refptr<net::IOBuffer> buf,
-      int buf_len,
-      OVERLAPPED* overlapped,
-      scoped_refptr<base::MessageLoopProxy> origin_thread_loop);
-
-  // This callback executes on the main calling thread. It informs the caller
-  // about the result of the ReadFile call.
-  // The |read_file_ret| parameter contains the return value of the ReadFile
-  // call.
-  // The |bytes_read| contains the number of bytes read from the file, if
-  // ReadFile succeeds.
-  // The |os_error| parameter contains the value of the last error returned by
-  // the ReadFile API.
-  void ReadAsyncResult(BOOL read_file_ret, DWORD bytes_read, DWORD os_error);
-
-#elif defined(OS_POSIX)
-  // ReadFileImpl() is a simple wrapper around read() that handles EINTR
-  // signals and calls RecordAndMapError() to map errno to net error codes.
-  IOResult ReadFileImpl(scoped_refptr<IOBuffer> buf, int buf_len);
-
-  // WriteFileImpl() is a simple wrapper around write() that handles EINTR
-  // signals and calls MapSystemError() to map errno to net error codes.
-  // It tries to write to completion.
-  IOResult WriteFileImpl(scoped_refptr<IOBuffer> buf, int buf_len);
-#endif
-
-  base::File file_;
-  bool async_in_progress_;
-  bool orphaned_;
-  scoped_refptr<base::TaskRunner> task_runner_;
-
-#if defined(OS_WIN)
-  base::MessageLoopForIO::IOContext io_context_;
-  CompletionCallback callback_;
-  scoped_refptr<IOBuffer> in_flight_buf_;
-  // This flag is set to true when we receive a Read request which is queued to
-  // the thread pool.
-  bool async_read_initiated_;
-  // This flag is set to true when we receive a notification ReadAsyncResult()
-  // on the calling thread which indicates that the asynchronous Read
-  // operation is complete.
-  bool async_read_completed_;
-  // This flag is set to true when we receive an IO completion notification for
-  // an asynchonously initiated Read operaton. OnIOComplete().
-  bool io_complete_for_read_received_;
-  // Tracks the result of the IO completion operation. Set in OnIOComplete.
-  int result_;
-#endif
-
-  DISALLOW_COPY_AND_ASSIGN(Context);
-};
-
-}  // namespace net
-
-#endif  // NET_BASE_FILE_STREAM_CONTEXT_H_