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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 // CompoundBuffer implements a data buffer that is composed of several pieces, | 5 // CompoundBuffer implements a data buffer that is composed of several pieces, |
| 6 // each stored in a refcounted IOBuffer. It is needed for encoding/decoding | 6 // each stored in a refcounted IOBuffer. It is needed for encoding/decoding |
| 7 // video pipeline to represent data packet and minimize data copying. | 7 // video pipeline to represent data packet and minimize data copying. |
| 8 // It is particularly useful for splitting data between multiple RTP packets | 8 // It is particularly useful for splitting data between multiple RTP packets |
| 9 // and assembling them into one buffer on the receiving side. | 9 // and assembling them into one buffer on the receiving side. |
| 10 // | 10 // |
| 11 // CompoundBufferInputStream implements ZeroCopyInputStream interface | 11 // CompoundBufferInputStream implements ZeroCopyInputStream interface |
| 12 // to be used by protobuf to decode data stored in CompoundBuffer into | 12 // to be used by protobuf to decode data stored in CompoundBuffer into |
| 13 // a protocol buffer message. | 13 // a protocol buffer message. |
| 14 // | 14 // |
| 15 // Mutations to the buffer are not thread-safe. Immutability can be ensured | 15 // Mutations to the buffer are not thread-safe. Immutability can be ensured |
| 16 // with the Lock() method. | 16 // with the Lock() method. |
| 17 | 17 |
| 18 #ifndef REMOTING_BASE_COMPOUND_BUFFER_H_ | 18 #ifndef REMOTING_BASE_COMPOUND_BUFFER_H_ |
| 19 #define REMOTING_BASE_COMPOUND_BUFFER_H_ | 19 #define REMOTING_BASE_COMPOUND_BUFFER_H_ |
| 20 | 20 |
| 21 #include <stddef.h> |
| 22 #include <stdint.h> |
| 23 |
| 21 #include <deque> | 24 #include <deque> |
| 22 | 25 |
| 23 #include "base/basictypes.h" | 26 #include "base/macros.h" |
| 24 #include "base/memory/ref_counted.h" | 27 #include "base/memory/ref_counted.h" |
| 25 #include "google/protobuf/io/zero_copy_stream.h" | 28 #include "google/protobuf/io/zero_copy_stream.h" |
| 26 | 29 |
| 27 namespace net { | 30 namespace net { |
| 28 class IOBuffer; | 31 class IOBuffer; |
| 29 class IOBufferWithSize; | 32 class IOBufferWithSize; |
| 30 } // namespace net | 33 } // namespace net |
| 31 | 34 |
| 32 namespace remoting { | 35 namespace remoting { |
| 33 | 36 |
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| 104 // Caller keeps ownership of |buffer|. |buffer| must be locked. | 107 // Caller keeps ownership of |buffer|. |buffer| must be locked. |
| 105 explicit CompoundBufferInputStream(const CompoundBuffer* buffer); | 108 explicit CompoundBufferInputStream(const CompoundBuffer* buffer); |
| 106 ~CompoundBufferInputStream() override; | 109 ~CompoundBufferInputStream() override; |
| 107 | 110 |
| 108 int position() const { return position_; } | 111 int position() const { return position_; } |
| 109 | 112 |
| 110 // google::protobuf::io::ZeroCopyInputStream interface. | 113 // google::protobuf::io::ZeroCopyInputStream interface. |
| 111 bool Next(const void** data, int* size) override; | 114 bool Next(const void** data, int* size) override; |
| 112 void BackUp(int count) override; | 115 void BackUp(int count) override; |
| 113 bool Skip(int count) override; | 116 bool Skip(int count) override; |
| 114 int64 ByteCount() const override; | 117 int64_t ByteCount() const override; |
| 115 | 118 |
| 116 private: | 119 private: |
| 117 const CompoundBuffer* buffer_; | 120 const CompoundBuffer* buffer_; |
| 118 | 121 |
| 119 size_t current_chunk_; | 122 size_t current_chunk_; |
| 120 int current_chunk_position_; | 123 int current_chunk_position_; |
| 121 int position_; | 124 int position_; |
| 122 int last_returned_size_; | 125 int last_returned_size_; |
| 123 }; | 126 }; |
| 124 | 127 |
| 125 } // namespace remoting | 128 } // namespace remoting |
| 126 | 129 |
| 127 #endif // REMOTING_BASE_COMPOUND_BUFFER_H_ | 130 #endif // REMOTING_BASE_COMPOUND_BUFFER_H_ |
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