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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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| 84 URLRequestFileJob::URLRequestFileJob(URLRequest* request, | 84 URLRequestFileJob::URLRequestFileJob(URLRequest* request, |
| 85 NetworkDelegate* network_delegate, | 85 NetworkDelegate* network_delegate, |
| 86 const FilePath& file_path) | 86 const FilePath& file_path) |
| 87 : URLRequestJob(request, network_delegate), | 87 : URLRequestJob(request, network_delegate), |
| 88 file_path_(file_path), | 88 file_path_(file_path), |
| 89 stream_(NULL), | 89 stream_(NULL), |
| 90 is_directory_(false), | 90 is_directory_(false), |
| 91 remaining_bytes_(0) { | 91 remaining_bytes_(0) { |
| 92 } | 92 } |
| 93 | 93 |
| 94 // static | |
| 95 URLRequestJob* URLRequestFileJob::Factory(URLRequest* request, | |
| 96 NetworkDelegate* network_delegate, | |
| 97 const std::string& scheme) { | |
| 98 FilePath file_path; | |
| 99 const bool is_file = FileURLToFilePath(request->url(), &file_path); | |
| 100 | |
| 101 // Check file access permissions. | |
| 102 if (!network_delegate || | |
| 103 !network_delegate->CanAccessFile(*request, file_path)) { | |
| 104 return new URLRequestErrorJob(request, network_delegate, ERR_ACCESS_DENIED); | |
| 105 } | |
| 106 // We need to decide whether to create URLRequestFileJob for file access or | |
| 107 // URLRequestFileDirJob for directory access. To avoid accessing the | |
| 108 // filesystem, we only look at the path string here. | |
| 109 // The code in the URLRequestFileJob::Start() method discovers that a path, | |
| 110 // which doesn't end with a slash, should really be treated as a directory, | |
| 111 // and it then redirects to the URLRequestFileDirJob. | |
| 112 if (is_file && | |
| 113 file_util::EndsWithSeparator(file_path) && | |
| 114 file_path.IsAbsolute()) | |
| 115 return new URLRequestFileDirJob(request, network_delegate, file_path); | |
| 116 | |
| 117 // Use a regular file request job for all non-directories (including invalid | |
| 118 // file names). | |
| 119 return new URLRequestFileJob(request, network_delegate, file_path); | |
| 120 } | |
| 121 | |
| 122 void URLRequestFileJob::Start() { | 94 void URLRequestFileJob::Start() { |
| 123 DCHECK(!async_resolver_); | 95 DCHECK(!async_resolver_); |
| 124 async_resolver_ = new AsyncResolver(this); | 96 async_resolver_ = new AsyncResolver(this); |
| 125 base::WorkerPool::PostTask( | 97 base::WorkerPool::PostTask( |
| 126 FROM_HERE, | 98 FROM_HERE, |
| 127 base::Bind(&AsyncResolver::Resolve, async_resolver_.get(), file_path_), | 99 base::Bind(&AsyncResolver::Resolve, async_resolver_.get(), file_path_), |
| 128 true); | 100 true); |
| 129 } | 101 } |
| 130 | 102 |
| 131 void URLRequestFileJob::Kill() { | 103 void URLRequestFileJob::Kill() { |
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| 330 NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, result)); | 302 NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, result)); |
| 331 } | 303 } |
| 332 | 304 |
| 333 remaining_bytes_ -= result; | 305 remaining_bytes_ -= result; |
| 334 DCHECK_GE(remaining_bytes_, 0); | 306 DCHECK_GE(remaining_bytes_, 0); |
| 335 | 307 |
| 336 NotifyReadComplete(result); | 308 NotifyReadComplete(result); |
| 337 } | 309 } |
| 338 | 310 |
| 339 } // namespace net | 311 } // namespace net |
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