blob: 0b243db8b68b42c01a383de2a8d8688de392649f (
plain)
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
|
// Copyright 2014 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 CONTENT_BROWSER_LOADER_STREAM_WRITER_H_
#define CONTENT_BROWSER_LOADER_STREAM_WRITER_H_
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "content/browser/streams/stream_write_observer.h"
class GURL;
namespace net {
class IOBuffer;
}
namespace content {
class ResourceController;
class Stream;
class StreamRegistry;
// StreamWriter is a helper class for ResourceHandlers which route their output
// into a Stream. It manages an internal buffer and handles back-pressure from
// the Stream's reader.
class StreamWriter : public StreamWriteObserver {
public:
// Creates a new StreamWriter without an initialized Stream or controller. The
// controller must be set before the writer is used.
StreamWriter();
~StreamWriter() override;
Stream* stream() { return stream_.get(); }
void set_controller(ResourceController* controller) {
controller_ = controller;
}
// When immediate mode is enabled, the |stream_| is flushed every time new
// data is made available by calls to OnReadCompleted.
void set_immediate_mode(bool enabled) { immediate_mode_ = enabled; }
// Initializes the writer with a new Stream in |registry|. |origin| will be
// used to construct the URL for the Stream. See WebCore::BlobURL and and
// WebCore::SecurityOrigin in Blink to understand how origin check is done on
// resource loading.
void InitializeStream(StreamRegistry* registry,
const GURL& origin);
// Prepares a buffer to read data from the request. This call will be followed
// by either OnReadCompleted (on successful read or EOF) or destruction. The
// buffer may not be recycled until OnReadCompleted is called. If |min_size|
// is not -1, it is the minimum size of the returned buffer.
//
// OnWillRead may be called before the stream is initialized. This is to
// support MimeTypeResourceHandler which reads the initial chunk of data
// early.
void OnWillRead(scoped_refptr<net::IOBuffer>* buf,
int* buf_size,
int min_size);
// A read was completed, forward the data to the Stream. If |*defer| is set to
// true, the implementation must not continue to process the request until
// Resume is called on |controller_|.
//
// InitializeStream must have been called before calling OnReadCompleted.
void OnReadCompleted(int bytes_read, bool* defer);
// Called when there is no more data to read to the stream.
void Finalize();
private:
// StreamWriteObserver implementation.
void OnSpaceAvailable(Stream* stream) override;
void OnClose(Stream* stream) override;
ResourceController* controller_;
scoped_refptr<Stream> stream_;
scoped_refptr<net::IOBuffer> read_buffer_;
bool immediate_mode_;
DISALLOW_COPY_AND_ASSIGN(StreamWriter);
};
} // namespace content
#endif // CONTENT_BROWSER_LOADER_STREAM_WRITER_H_
|
