1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
// Copyright 2019 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_MEMORY_FILE_STREAM_READER_H_
#define STORAGE_BROWSER_FILE_SYSTEM_MEMORY_FILE_STREAM_READER_H_
#include "base/component_export.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "net/base/completion_once_callback.h"
#include "storage/browser/file_system/file_stream_reader.h"
#include "storage/browser/file_system/obfuscated_file_util_memory_delegate.h"
namespace storage {
// A stream reader for memory files.
class COMPONENT_EXPORT(STORAGE_BROWSER) MemoryFileStreamReader
: public FileStreamReader {
public:
// Creates a new FileReader for a memory file |file_path|.
// |initial_offset| specifies the offset in the file where the first read
// should start. If the given offset is out of the file range any
// read operation may error out with net::ERR_REQUEST_RANGE_NOT_SATISFIABLE.
// |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.
MemoryFileStreamReader(
scoped_refptr<base::TaskRunner> task_runner,
base::WeakPtr<ObfuscatedFileUtilMemoryDelegate> memory_file_util,
const base::FilePath& file_path,
int64_t initial_offset,
const base::Time& expected_modification_time);
MemoryFileStreamReader(const MemoryFileStreamReader&) = delete;
MemoryFileStreamReader& operator=(const MemoryFileStreamReader&) = delete;
~MemoryFileStreamReader() override;
// FileStreamReader overrides.
int Read(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) override;
int64_t GetLength(net::Int64CompletionOnceCallback callback) override;
private:
void OnReadCompleted(net::CompletionOnceCallback callback, int result);
void OnGetLengthCompleted(net::Int64CompletionOnceCallback callback,
int64_t result);
base::WeakPtr<ObfuscatedFileUtilMemoryDelegate> memory_file_util_;
const scoped_refptr<base::TaskRunner> task_runner_;
const base::FilePath file_path_;
const base::Time expected_modification_time_;
int64_t offset_;
base::WeakPtrFactory<MemoryFileStreamReader> weak_factory_{this};
};
} // namespace storage
#endif // STORAGE_BROWSER_FILE_SYSTEM_MEMORY_FILE_STREAM_READER_H_
|
