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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // For loading files, we make use of overlapped i/o to ensure that reading from | 5 // For loading files, we make use of overlapped i/o to ensure that reading from |
6 // the filesystem (e.g., a network filesystem) does not block the calling | 6 // the filesystem (e.g., a network filesystem) does not block the calling |
7 // thread. An alternative approach would be to use a background thread or pool | 7 // thread. An alternative approach would be to use a background thread or pool |
8 // of threads, but it seems better to leverage the operating system's ability | 8 // of threads, but it seems better to leverage the operating system's ability |
9 // to do background file reads for us. | 9 // to do background file reads for us. |
10 // | 10 // |
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86 URLRequestFileJob::URLRequestFileJob(URLRequest* request, | 86 URLRequestFileJob::URLRequestFileJob(URLRequest* request, |
87 const FilePath& file_path, | 87 const FilePath& file_path, |
88 NetworkDelegate* network_delegate) | 88 NetworkDelegate* network_delegate) |
89 : URLRequestJob(request, network_delegate), | 89 : URLRequestJob(request, network_delegate), |
90 file_path_(file_path), | 90 file_path_(file_path), |
91 stream_(NULL), | 91 stream_(NULL), |
92 is_directory_(false), | 92 is_directory_(false), |
93 remaining_bytes_(0) { | 93 remaining_bytes_(0) { |
94 } | 94 } |
95 | 95 |
96 // static | |
97 URLRequestJob* URLRequestFileJob::Factory(URLRequest* request, | |
98 const std::string& scheme) { | |
99 FilePath file_path; | |
100 const bool is_file = FileURLToFilePath(request->url(), &file_path); | |
101 | |
102 // Check file access permissions. | |
103 if (!request->context()->network_delegate() || | |
104 !request->context()->network_delegate()->CanAccessFile( | |
105 *request, file_path)) { | |
106 return new URLRequestErrorJob(request, ERR_ACCESS_DENIED); | |
107 } | |
108 | |
109 // We need to decide whether to create URLRequestFileJob for file access or | |
110 // URLRequestFileDirJob for directory access. To avoid accessing the | |
111 // filesystem, we only look at the path string here. | |
112 // The code in the URLRequestFileJob::Start() method discovers that a path, | |
113 // which doesn't end with a slash, should really be treated as a directory, | |
114 // and it then redirects to the URLRequestFileDirJob. | |
115 if (is_file && | |
116 file_util::EndsWithSeparator(file_path) && | |
117 file_path.IsAbsolute()) | |
118 return new URLRequestFileDirJob(request, file_path); | |
119 | |
120 // Use a regular file request job for all non-directories (including invalid | |
121 // file names). | |
122 return new URLRequestFileJob( | |
123 request, file_path, request->context()->network_delegate()); | |
124 } | |
125 | |
126 void URLRequestFileJob::Start() { | 96 void URLRequestFileJob::Start() { |
127 DCHECK(!async_resolver_); | 97 DCHECK(!async_resolver_); |
128 async_resolver_ = new AsyncResolver(this); | 98 async_resolver_ = new AsyncResolver(this); |
129 base::WorkerPool::PostTask( | 99 base::WorkerPool::PostTask( |
130 FROM_HERE, | 100 FROM_HERE, |
131 base::Bind(&AsyncResolver::Resolve, async_resolver_.get(), file_path_), | 101 base::Bind(&AsyncResolver::Resolve, async_resolver_.get(), file_path_), |
132 true); | 102 true); |
133 } | 103 } |
134 | 104 |
135 void URLRequestFileJob::Kill() { | 105 void URLRequestFileJob::Kill() { |
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334 NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, result)); | 304 NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, result)); |
335 } | 305 } |
336 | 306 |
337 remaining_bytes_ -= result; | 307 remaining_bytes_ -= result; |
338 DCHECK_GE(remaining_bytes_, 0); | 308 DCHECK_GE(remaining_bytes_, 0); |
339 | 309 |
340 NotifyReadComplete(result); | 310 NotifyReadComplete(result); |
341 } | 311 } |
342 | 312 |
343 } // namespace net | 313 } // namespace net |
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