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Side by Side Diff: third_party/crashpad/crashpad/util/file/file_writer.h

Issue 2773813002: Update Crashpad to 8e37886d418dd042c3c7bfadac99214739ee4d98 (Closed)
Patch Set: Update Crashpad to 8e37886d418dd042c3c7bfadac99214739ee4d98 Created 3 years, 9 months ago
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1 // Copyright 2014 The Crashpad Authors. All rights reserved. 1 // Copyright 2014 The Crashpad Authors. All rights reserved.
2 // 2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); 3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License. 4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at 5 // You may obtain a copy of the License at
6 // 6 //
7 // http://www.apache.org/licenses/LICENSE-2.0 7 // http://www.apache.org/licenses/LICENSE-2.0
8 // 8 //
9 // Unless required by applicable law or agreed to in writing, software 9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, 10 // distributed under the License is distributed on an "AS IS" BASIS,
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160 //! a Close(). 160 //! a Close().
161 FileOffset Seek(FileOffset offset, int whence) override; 161 FileOffset Seek(FileOffset offset, int whence) override;
162 162
163 private: 163 private:
164 ScopedFileHandle file_; 164 ScopedFileHandle file_;
165 WeakFileHandleFileWriter weak_file_handle_file_writer_; 165 WeakFileHandleFileWriter weak_file_handle_file_writer_;
166 166
167 DISALLOW_COPY_AND_ASSIGN(FileWriter); 167 DISALLOW_COPY_AND_ASSIGN(FileWriter);
168 }; 168 };
169 169
170 //! \brief A file writer backed by a standard input/output `FILE*`.
171 //!
172 //! This class accepts an already-open `FILE*`. It is not responsible for
173 //! opening or closing this `FILE*`. Users of this class must ensure that the
174 //! `FILE*` is closed appropriately elsewhere. Objects of this class may be used
175 //! to write to `FILE*` objects not associated with filesystem-based files,
176 //! although special attention should be paid to the Seek() method, which may
177 //! not function on `FILE*` objects that do not refer to disk-based files.
178 //!
179 //! This class is expected to be used when other code is responsible for
180 //! opening `FILE*` objects and already provides `FILE*` objects. A good use
181 //! would be a WeakStdioFileWriter for `stdout`.
182 class WeakStdioFileWriter : public FileWriterInterface {
183 public:
184 explicit WeakStdioFileWriter(FILE* file);
185 ~WeakStdioFileWriter() override;
186
187 // FileWriterInterface:
188 bool Write(const void* data, size_t size) override;
189 bool WriteIoVec(std::vector<WritableIoVec>* iovecs) override;
190
191 // FileSeekerInterface:
192
193 //! \copydoc FileWriterInterface::Seek()
194 //!
195 //! \note This method is only guaranteed to function on `FILE*` objects
196 //! referring to disk-based files.
197 FileOffset Seek(FileOffset offset, int whence) override;
198
199 private:
200 FILE* file_; // weak
201
202 DISALLOW_COPY_AND_ASSIGN(WeakStdioFileWriter);
203 };
204
205 } // namespace crashpad 170 } // namespace crashpad
206 171
207 #endif // CRASHPAD_UTIL_FILE_FILE_WRITER_H_ 172 #endif // CRASHPAD_UTIL_FILE_FILE_WRITER_H_
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