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// 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.
#ifndef WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
#define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
#include "base/bind.h"
#include "base/memory/ref_counted.h"
#include "base/platform_file.h"
#include "base/time.h"
#include "webkit/browser/blob/file_stream_reader.h"
#include "webkit/browser/fileapi/file_system_url.h"
#include "webkit/common/blob/shareable_file_reference.h"
#include "webkit/storage/webkit_storage_export.h"
namespace base {
class FilePath;
class SequencedTaskRunner;
}
namespace webkit_blob {
class LocalFileStreamReader;
}
namespace fileapi {
class FileSystemContext;
// TODO(kinaba,satorux): This generic implementation would work for any
// filesystems but remote filesystem should implement its own reader
// rather than relying on FileSystemOperation::GetSnapshotFile() which
// may force downloading the entire contents for remote files.
class WEBKIT_STORAGE_EXPORT_PRIVATE FileSystemFileStreamReader
: public webkit_blob::FileStreamReader {
public:
// Creates a new FileReader for a filesystem URL |url| form |initial_offset|.
// |expected_modification_time| specifies the expected last modification if
// the value is non-null, the reader will check the underlying file's actual
// modification time to see if the file has been modified, and if it does any
// succeeding read operations should fail with ERR_UPLOAD_FILE_CHANGED error.
FileSystemFileStreamReader(FileSystemContext* file_system_context,
const FileSystemURL& url,
int64 initial_offset,
const base::Time& expected_modification_time);
virtual ~FileSystemFileStreamReader();
// FileStreamReader overrides.
virtual int Read(net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback) OVERRIDE;
virtual int64 GetLength(
const net::Int64CompletionCallback& callback) OVERRIDE;
private:
int CreateSnapshot(const base::Closure& callback,
const net::CompletionCallback& error_callback);
void DidCreateSnapshot(
const base::Closure& callback,
const net::CompletionCallback& error_callback,
base::PlatformFileError file_error,
const base::PlatformFileInfo& file_info,
const base::FilePath& platform_path,
const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref);
scoped_refptr<FileSystemContext> file_system_context_;
FileSystemURL url_;
const int64 initial_offset_;
const base::Time expected_modification_time_;
scoped_ptr<webkit_blob::LocalFileStreamReader> local_file_reader_;
scoped_refptr<webkit_blob::ShareableFileReference> snapshot_ref_;
bool has_pending_create_snapshot_;
base::WeakPtrFactory<FileSystemFileStreamReader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(FileSystemFileStreamReader);
};
} // namespace fileapi
#endif // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
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