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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "webkit/browser/fileapi/file_system_file_stream_reader.h" | |
6 | |
7 #include "base/files/file_util_proxy.h" | |
8 #include "base/single_thread_task_runner.h" | |
9 #include "net/base/file_stream.h" | |
10 #include "net/base/io_buffer.h" | |
11 #include "net/base/net_errors.h" | |
12 #include "webkit/browser/blob/file_stream_reader.h" | |
13 #include "webkit/browser/fileapi/file_system_context.h" | |
14 #include "webkit/browser/fileapi/file_system_operation_runner.h" | |
15 | |
16 using webkit_blob::FileStreamReader; | |
17 | |
18 // TODO(kinuko): Remove this temporary namespace hack after we move both | |
19 // blob and fileapi into content namespace. | |
20 namespace webkit_blob { | |
21 | |
22 FileStreamReader* FileStreamReader::CreateForFileSystemFile( | |
23 fileapi::FileSystemContext* file_system_context, | |
24 const fileapi::FileSystemURL& url, | |
25 int64 initial_offset, | |
26 const base::Time& expected_modification_time) { | |
27 return new fileapi::FileSystemFileStreamReader( | |
28 file_system_context, | |
29 url, | |
30 initial_offset, | |
31 expected_modification_time); | |
32 } | |
33 | |
34 } // namespace webkit_blob | |
35 | |
36 namespace fileapi { | |
37 | |
38 namespace { | |
39 | |
40 void ReadAdapter(base::WeakPtr<FileSystemFileStreamReader> reader, | |
41 net::IOBuffer* buf, int buf_len, | |
42 const net::CompletionCallback& callback) { | |
43 if (!reader.get()) | |
44 return; | |
45 int rv = reader->Read(buf, buf_len, callback); | |
46 if (rv != net::ERR_IO_PENDING) | |
47 callback.Run(rv); | |
48 } | |
49 | |
50 void GetLengthAdapter(base::WeakPtr<FileSystemFileStreamReader> reader, | |
51 const net::Int64CompletionCallback& callback) { | |
52 if (!reader.get()) | |
53 return; | |
54 int rv = reader->GetLength(callback); | |
55 if (rv != net::ERR_IO_PENDING) | |
56 callback.Run(rv); | |
57 } | |
58 | |
59 void Int64CallbackAdapter(const net::Int64CompletionCallback& callback, | |
60 int value) { | |
61 callback.Run(value); | |
62 } | |
63 | |
64 } // namespace | |
65 | |
66 FileSystemFileStreamReader::~FileSystemFileStreamReader() { | |
67 } | |
68 | |
69 int FileSystemFileStreamReader::Read( | |
70 net::IOBuffer* buf, int buf_len, | |
71 const net::CompletionCallback& callback) { | |
72 if (local_file_reader_) | |
73 return local_file_reader_->Read(buf, buf_len, callback); | |
74 return CreateSnapshot( | |
75 base::Bind(&ReadAdapter, weak_factory_.GetWeakPtr(), | |
76 make_scoped_refptr(buf), buf_len, callback), | |
77 callback); | |
78 } | |
79 | |
80 int64 FileSystemFileStreamReader::GetLength( | |
81 const net::Int64CompletionCallback& callback) { | |
82 if (local_file_reader_) | |
83 return local_file_reader_->GetLength(callback); | |
84 return CreateSnapshot( | |
85 base::Bind(&GetLengthAdapter, weak_factory_.GetWeakPtr(), callback), | |
86 base::Bind(&Int64CallbackAdapter, callback)); | |
87 } | |
88 | |
89 FileSystemFileStreamReader::FileSystemFileStreamReader( | |
90 FileSystemContext* file_system_context, | |
91 const FileSystemURL& url, | |
92 int64 initial_offset, | |
93 const base::Time& expected_modification_time) | |
94 : file_system_context_(file_system_context), | |
95 url_(url), | |
96 initial_offset_(initial_offset), | |
97 expected_modification_time_(expected_modification_time), | |
98 has_pending_create_snapshot_(false), | |
99 weak_factory_(this) { | |
100 } | |
101 | |
102 int FileSystemFileStreamReader::CreateSnapshot( | |
103 const base::Closure& callback, | |
104 const net::CompletionCallback& error_callback) { | |
105 DCHECK(!has_pending_create_snapshot_); | |
106 has_pending_create_snapshot_ = true; | |
107 file_system_context_->operation_runner()->CreateSnapshotFile( | |
108 url_, | |
109 base::Bind(&FileSystemFileStreamReader::DidCreateSnapshot, | |
110 weak_factory_.GetWeakPtr(), | |
111 callback, | |
112 error_callback)); | |
113 return net::ERR_IO_PENDING; | |
114 } | |
115 | |
116 void FileSystemFileStreamReader::DidCreateSnapshot( | |
117 const base::Closure& callback, | |
118 const net::CompletionCallback& error_callback, | |
119 base::File::Error file_error, | |
120 const base::File::Info& file_info, | |
121 const base::FilePath& platform_path, | |
122 const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref) { | |
123 DCHECK(has_pending_create_snapshot_); | |
124 DCHECK(!local_file_reader_.get()); | |
125 has_pending_create_snapshot_ = false; | |
126 | |
127 if (file_error != base::File::FILE_OK) { | |
128 error_callback.Run(net::FileErrorToNetError(file_error)); | |
129 return; | |
130 } | |
131 | |
132 // Keep the reference (if it's non-null) so that the file won't go away. | |
133 snapshot_ref_ = file_ref; | |
134 | |
135 local_file_reader_.reset( | |
136 FileStreamReader::CreateForLocalFile( | |
137 file_system_context_->default_file_task_runner(), | |
138 platform_path, initial_offset_, expected_modification_time_)); | |
139 | |
140 callback.Run(); | |
141 } | |
142 | |
143 } // namespace fileapi | |
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