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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_FILEAPI_FILE_SYSTEM_FILE_READER_H_
#define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_READER_H_
#pragma once
#include "base/bind.h"
#include "base/memory/ref_counted.h"
#include "base/platform_file.h"
#include "googleurl/src/gurl.h"
#include "webkit/blob/file_reader.h"
class FilePath;
namespace base {
class SequencedTaskRunner;
}
namespace webkit_blob {
class LocalFileReader;
class ShareableFileReference;
}
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 FileSystemFileReader : public webkit_blob::FileReader {
public:
// Creates a new FileReader for a filesystem URL |url| form |initial_offset|.
FileSystemFileReader(FileSystemContext* file_system_context,
const GURL& url,
int64 initial_offset);
virtual ~FileSystemFileReader();
// FileReader override.
virtual int Read(net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback) OVERRIDE;
private:
void DidCreateSnapshot(
const base::Closure& read_closure,
const net::CompletionCallback& callback,
base::PlatformFileError file_error,
const base::PlatformFileInfo& file_info,
const FilePath& platform_path,
const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref);
scoped_refptr<FileSystemContext> file_system_context_;
const GURL url_;
const int64 initial_offset_;
scoped_ptr<webkit_blob::LocalFileReader> local_file_reader_;
scoped_refptr<webkit_blob::ShareableFileReference> snapshot_ref_;
bool has_pending_create_snapshot_;
base::WeakPtrFactory<FileSystemFileReader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(FileSystemFileReader);
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_READER_H_
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