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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_FileHandle_h
#define mozilla_dom_FileHandle_h
#include "FileHandleCommon.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/FileModeBinding.h"
#include "mozilla/dom/Nullable.h"
#include "mozilla/dom/TypedArray.h"
template <class> struct already_AddRefed;
class nsAString;
struct PRThread;
namespace mozilla {
class ErrorResult;
namespace dom {
class BackgroundFileHandleChild;
class Blob;
class FileRequestBase;
class FileRequestData;
class FileRequestParams;
class MutableFileBase;
class StringOrArrayBufferOrArrayBufferViewOrBlob;
/**
* This class provides a base for FileHandle implementations.
*/
class FileHandleBase
: public RefCountedThreadObject
{
public:
enum ReadyState
{
INITIAL = 0,
LOADING,
FINISHING,
DONE
};
private:
BackgroundFileHandleChild* mBackgroundActor;
uint64_t mLocation;
uint32_t mPendingRequestCount;
ReadyState mReadyState;
FileMode mMode;
bool mAborted;
bool mCreating;
DEBUGONLY(bool mSentFinishOrAbort;)
DEBUGONLY(bool mFiredCompleteOrAbort;)
public:
static FileHandleBase*
GetCurrent();
void
SetBackgroundActor(BackgroundFileHandleChild* aActor);
void
ClearBackgroundActor()
{
AssertIsOnOwningThread();
mBackgroundActor = nullptr;
}
void
StartRequest(FileRequestBase* aFileRequest, const FileRequestParams& aParams);
void
OnNewRequest();
void
OnRequestFinished(bool aActorDestroyedNormally);
bool
IsOpen() const;
bool
IsFinishingOrDone() const
{
AssertIsOnOwningThread();
return mReadyState == FINISHING || mReadyState == DONE;
}
bool
IsDone() const
{
AssertIsOnOwningThread();
return mReadyState == DONE;
}
bool
IsAborted() const
{
AssertIsOnOwningThread();
return mAborted;
}
void
SetCreating()
{
mCreating = true;
}
void
Abort();
// Shared WebIDL (IndexedDB FileHandle and FileSystem FileHandle)
FileMode
Mode() const
{
AssertIsOnOwningThread();
return mMode;
}
bool
Active() const
{
AssertIsOnOwningThread();
return IsOpen();
}
Nullable<uint64_t>
GetLocation() const
{
AssertIsOnOwningThread();
if (mLocation == UINT64_MAX) {
return Nullable<uint64_t>();
}
return Nullable<uint64_t>(mLocation);
}
void
SetLocation(const Nullable<uint64_t>& aLocation)
{
AssertIsOnOwningThread();
// Null means the end-of-file.
if (aLocation.IsNull()) {
mLocation = UINT64_MAX;
} else {
mLocation = aLocation.Value();
}
}
already_AddRefed<FileRequestBase>
Read(uint64_t aSize, bool aHasEncoding, const nsAString& aEncoding,
ErrorResult& aRv);
already_AddRefed<FileRequestBase>
Truncate(const Optional<uint64_t>& aSize, ErrorResult& aRv);
already_AddRefed<FileRequestBase>
Flush(ErrorResult& aRv);
void
Abort(ErrorResult& aRv);
// Must be overridden in subclasses.
virtual MutableFileBase*
MutableFile() const = 0;
// May be overridden in subclasses.
virtual void
HandleCompleteOrAbort(bool aAborted);
protected:
FileHandleBase(DEBUGONLY(PRThread* aOwningThread,)
FileMode aMode);
~FileHandleBase();
void
OnReturnToEventLoop();
bool
CheckState(ErrorResult& aRv);
bool
CheckStateAndArgumentsForRead(uint64_t aSize, ErrorResult& aRv);
bool
CheckStateForWrite(ErrorResult& aRv);
bool
CheckStateForWriteOrAppend(bool aAppend, ErrorResult& aRv);
already_AddRefed<FileRequestBase>
WriteOrAppend(const StringOrArrayBufferOrArrayBufferViewOrBlob& aValue,
bool aAppend,
ErrorResult& aRv);
// Must be overridden in subclasses.
virtual bool
CheckWindow() = 0;
// Must be overridden in subclasses.
virtual already_AddRefed<FileRequestBase>
GenerateFileRequest() = 0;
private:
already_AddRefed<FileRequestBase>
WriteOrAppend(const nsAString& aValue, bool aAppend, ErrorResult& aRv);
already_AddRefed<FileRequestBase>
WriteOrAppend(const ArrayBuffer& aValue, bool aAppend, ErrorResult& aRv);
already_AddRefed<FileRequestBase>
WriteOrAppend(const ArrayBufferView& aValue, bool aAppend, ErrorResult& aRv);
already_AddRefed<FileRequestBase>
WriteOrAppend(Blob& aValue, bool aAppend, ErrorResult& aRv);
already_AddRefed<FileRequestBase>
WriteInternal(const FileRequestData& aData, uint64_t aDataLength,
bool aAppend, ErrorResult& aRv);
void
SendFinish();
void
SendAbort();
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_FileHandle_h
|
