File: ReadStream.h

package info (click to toggle)
thunderbird 1:60.8.0-1~deb9u1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 2,339,208 kB
  • sloc: cpp: 5,456,704; ansic: 2,360,384; python: 596,095; asm: 340,963; java: 326,291; xml: 258,664; sh: 84,366; makefile: 23,702; perl: 17,317; objc: 3,768; yacc: 1,766; ada: 1,681; lex: 1,364; pascal: 1,264; cs: 879; exp: 527; php: 436; lisp: 258; ruby: 153; awk: 152; sed: 53; csh: 27
file content (114 lines) | stat: -rw-r--r-- 3,816 bytes parent folder | download | duplicates (7)
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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_cache_ReadStream_h
#define mozilla_dom_cache_ReadStream_h

#include "mozilla/ErrorResult.h"
#include "mozilla/ipc/FileDescriptor.h"
#include "mozilla/RefPtr.h"
#include "nsCOMPtr.h"
#include "nsID.h"
#include "nsIInputStream.h"
#include "nsISupportsImpl.h"
#include "nsTArrayForwardDeclare.h"

namespace mozilla {
namespace ipc {
class AutoIPCStream;
}  // namespace ipc
namespace dom {
namespace cache {

class CacheReadStream;
class CacheReadStreamOrVoid;
class PCacheStreamControlParent;

// IID for the dom::cache::ReadStream interface
#define NS_DOM_CACHE_READSTREAM_IID                  \
  {                                                  \
    0x8e5da7c9, 0x0940, 0x4f1d, {                    \
      0x97, 0x25, 0x5c, 0x59, 0x38, 0xdd, 0xb9, 0x9f \
    }                                                \
  }

// Custom stream class for Request and Response bodies being read from
// a Cache.  The main purpose of this class is to report back to the
// Cache's Manager when the stream is closed.  This allows the Cache to
// accurately determine when the underlying body file can be deleted,
// etc.
//
// The ReadStream class also provides us with a convenient QI'able
// interface that we can use to pass additional meta-data with the
// stream channel.  For example, Cache.put() can detect that the content
// script is passing a Cache-originated-stream back into the Cache
// again.  This enables certain optimizations.
class ReadStream final : public nsIInputStream {
 public:
  // Interface that lets the StreamControl classes interact with
  // our private inner stream.
  class Controllable {
   public:
    // Closes the stream, notifies the stream control, and then forgets
    // the stream control.
    virtual void CloseStream() = 0;

    // Closes the stream and then forgets the stream control.  Does not
    // notify.
    virtual void CloseStreamWithoutReporting() = 0;

    virtual bool MatchId(const nsID& aId) const = 0;

    virtual bool HasEverBeenRead() const = 0;

    NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
  };

  static already_AddRefed<ReadStream> Create(
      const CacheReadStreamOrVoid& aReadStreamOrVoid);

  static already_AddRefed<ReadStream> Create(
      const CacheReadStream& aReadStream);

  static already_AddRefed<ReadStream> Create(
      PCacheStreamControlParent* aControl, const nsID& aId,
      nsIInputStream* aStream);

  void Serialize(
      CacheReadStreamOrVoid* aReadStreamOut,
      nsTArray<UniquePtr<mozilla::ipc::AutoIPCStream>>& aStreamCleanupList,
      ErrorResult& aRv);
  void Serialize(
      CacheReadStream* aReadStreamOut,
      nsTArray<UniquePtr<mozilla::ipc::AutoIPCStream>>& aStreamCleanupList,
      ErrorResult& aRv);

 private:
  class Inner;

  explicit ReadStream(Inner* aInner);
  ~ReadStream();

  // Hold a strong ref to an inner class that actually implements the
  // majority of the stream logic.  Before releasing this ref the outer
  // ReadStream guarantees it will call Close() on the inner stream.
  // This is essential for the inner stream to avoid dealing with the
  // implicit close that can happen when a stream is destroyed.
  RefPtr<Inner> mInner;

 public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOM_CACHE_READSTREAM_IID);
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIINPUTSTREAM
};

NS_DEFINE_STATIC_IID_ACCESSOR(ReadStream, NS_DOM_CACHE_READSTREAM_IID);

}  // namespace cache
}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_cache_ReadStream_h