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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef STORAGE_BROWSER_FILE_SYSTEM_SANDBOX_FILE_STREAM_READER_H_
#define STORAGE_BROWSER_FILE_SYSTEM_SANDBOX_FILE_STREAM_READER_H_
#include <stdint.h>
#include <memory>
#include "base/component_export.h"
#include "base/files/file.h"
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/time/time.h"
#include "net/base/completion_once_callback.h"
#include "storage/browser/blob/shareable_file_reference.h"
#include "storage/browser/file_system/file_stream_reader.h"
#include "storage/browser/file_system/file_system_operation_runner.h"
#include "storage/browser/file_system/file_system_url.h"
namespace base {
class FilePath;
}
namespace storage {
class FileSystemContext;
// FileStreamReader implementation for Sandboxed FileSystem files.
// This wraps either a LocalFileStreamReader or a MemoryFileStreamReader,
// depending on if we're in an incognito profile or not.
class COMPONENT_EXPORT(STORAGE_BROWSER) SandboxFileStreamReader
: public FileStreamReader {
public:
// Creates a new reader for a filesystem URL |url| from |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.
SandboxFileStreamReader(FileSystemContext* file_system_context,
const FileSystemURL& url,
int64_t initial_offset,
const base::Time& expected_modification_time);
SandboxFileStreamReader(const SandboxFileStreamReader&) = delete;
SandboxFileStreamReader& operator=(const SandboxFileStreamReader&) = delete;
~SandboxFileStreamReader() override;
// FileStreamReader overrides.
int Read(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) override;
int64_t GetLength(net::Int64CompletionOnceCallback callback) override;
private:
friend class FileStreamReader;
using SnapshotCallback = FileSystemOperationRunner::SnapshotFileCallback;
int CreateSnapshot(SnapshotCallback callback);
void DidCreateSnapshotForRead(net::IOBuffer* read_buf,
int read_len,
net::CompletionOnceCallback callback,
base::File::Error file_error,
const base::File::Info& file_info,
const base::FilePath& platform_path,
scoped_refptr<ShareableFileReference> file_ref);
void DidCreateSnapshotForGetLength(
net::Int64CompletionOnceCallback callback,
base::File::Error file_error,
const base::File::Info& file_info,
const base::FilePath& platform_path,
scoped_refptr<ShareableFileReference> file_ref);
void CreateFileReader(const base::FilePath& platform_path);
void OnRead(net::CompletionOnceCallback callback, int rv);
void OnGetLength(net::Int64CompletionOnceCallback callback, int64_t rv);
scoped_refptr<FileSystemContext> file_system_context_;
FileSystemURL url_;
const int64_t initial_offset_;
const base::Time expected_modification_time_;
std::unique_ptr<FileStreamReader> file_reader_;
scoped_refptr<ShareableFileReference> snapshot_ref_;
bool has_pending_create_snapshot_;
base::WeakPtrFactory<SandboxFileStreamReader> weak_factory_{this};
};
} // namespace storage
#endif // STORAGE_BROWSER_FILE_SYSTEM_SANDBOX_FILE_STREAM_READER_H_
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