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Side by Side Diff: base/partial_circular_buffer.h

Issue 14329020: Implementing uploading of a WebRTC diagnostic log. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Removed two files Created 7 years, 7 months ago
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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2013 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 #ifndef CONTENT_COMMON_PARTIAL_CIRCULAR_BUFFER_H_ 5 #ifndef BASE_PARTIAL_CIRCULAR_BUFFER_H_
6 #define CONTENT_COMMON_PARTIAL_CIRCULAR_BUFFER_H_ 6 #define BASE_PARTIAL_CIRCULAR_BUFFER_H_
7 7
8 #include "base/base_export.h"
8 #include "base/basictypes.h" 9 #include "base/basictypes.h"
9 #include "base/gtest_prod_util.h" 10 #include "base/gtest_prod_util.h"
10 #include "content/common/content_export.h"
11 11
12 namespace content { 12 namespace base {
13 13
14 // A wrapper around a memory buffer that allows circular read and write with a 14 // A wrapper around a memory buffer that allows circular read and write with a
15 // selectable wrapping position. Buffer layout (after wrap; H is header): 15 // selectable wrapping position. Buffer layout (after wrap; H is header):
16 // ----------------------------------------------------------- 16 // -----------------------------------------------------------
17 // | H | Beginning | End | Middle | 17 // | H | Beginning | End | Middle |
18 // ----------------------------------------------------------- 18 // -----------------------------------------------------------
19 // ^---- Non-wrapping -----^ ^--------- Wrapping ----------^ 19 // ^---- Non-wrapping -----^ ^--------- Wrapping ----------^
20 // The non-wrapping part is never overwritten. The wrapping part will be 20 // The non-wrapping part is never overwritten. The wrapping part will be
21 // circular. The very first part is the header (see the BufferData struct 21 // circular. The very first part is the header (see the BufferData struct
22 // below). It consists of the following information: 22 // below). It consists of the following information:
23 // - Length written to the buffer (not including header). 23 // - Length written to the buffer (not including header).
24 // - Wrapping position. 24 // - Wrapping position.
25 // - End position of buffer. (If the last byte is at x, this will be x + 1.) 25 // - End position of buffer. (If the last byte is at x, this will be x + 1.)
26 // Users of wrappers around the same underlying buffer must ensure that writing 26 // Users of wrappers around the same underlying buffer must ensure that writing
27 // is finished before reading is started. 27 // is finished before reading is started.
28 class CONTENT_EXPORT PartialCircularBuffer { 28 class BASE_EXPORT PartialCircularBuffer {
29 public: 29 public:
30 // Use for reading. |buffer_size| is in bytes and must be larger than the 30 // Use for reading. |buffer_size| is in bytes and must be larger than the
31 // header size (see above). 31 // header size (see above).
32 PartialCircularBuffer(void* buffer, uint32 buffer_size); 32 PartialCircularBuffer(void* buffer, uint32 buffer_size);
33 33
34 // Use for writing. |buffer_size| is in bytes and must be larger than the 34 // Use for writing. |buffer_size| is in bytes and must be larger than the
35 // header size (see above). 35 // header size (see above).
36 PartialCircularBuffer(void* buffer, 36 PartialCircularBuffer(void* buffer,
37 uint32 buffer_size, 37 uint32 buffer_size,
38 uint32 wrap_position); 38 uint32 wrap_position);
(...skipping 19 matching lines...) Expand all
58 // Used for reading and writing. 58 // Used for reading and writing.
59 BufferData* buffer_data_; 59 BufferData* buffer_data_;
60 uint32 memory_buffer_size_; 60 uint32 memory_buffer_size_;
61 uint32 data_size_; 61 uint32 data_size_;
62 uint32 position_; 62 uint32 position_;
63 63
64 // Used for reading. 64 // Used for reading.
65 uint32 total_read_; 65 uint32 total_read_;
66 }; 66 };
67 67
68 } // namespace content 68 } // namespace base
69 69
70 #endif // CONTENT_COMMON_PARTIAL_CIRCULAR_BUFFER_H_ 70 #endif // BASE_PARTIAL_CIRCULAR_BUFFER_H_
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