henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2004-2010, Google Inc. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are met: |
| 7 | * |
| 8 | * 1. Redistributions of source code must retain the above copyright notice, |
| 9 | * this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 19 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 20 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #ifndef TALK_BASE_BUFFER_H_ |
| 29 | #define TALK_BASE_BUFFER_H_ |
| 30 | |
pbos@webrtc.org | b951827 | 2014-03-07 15:22:04 +0000 | [diff] [blame] | 31 | #include <string.h> |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 32 | |
| 33 | #include "talk/base/scoped_ptr.h" |
| 34 | |
| 35 | namespace talk_base { |
| 36 | |
| 37 | // Basic buffer class, can be grown and shrunk dynamically. |
| 38 | // Unlike std::string/vector, does not initialize data when expanding capacity. |
| 39 | class Buffer { |
| 40 | public: |
| 41 | Buffer() { |
| 42 | Construct(NULL, 0, 0); |
| 43 | } |
| 44 | Buffer(const void* data, size_t length) { |
| 45 | Construct(data, length, length); |
| 46 | } |
| 47 | Buffer(const void* data, size_t length, size_t capacity) { |
| 48 | Construct(data, length, capacity); |
| 49 | } |
| 50 | Buffer(const Buffer& buf) { |
| 51 | Construct(buf.data(), buf.length(), buf.length()); |
| 52 | } |
| 53 | |
| 54 | const char* data() const { return data_.get(); } |
| 55 | char* data() { return data_.get(); } |
| 56 | // TODO: should this be size(), like STL? |
| 57 | size_t length() const { return length_; } |
| 58 | size_t capacity() const { return capacity_; } |
| 59 | |
| 60 | Buffer& operator=(const Buffer& buf) { |
| 61 | if (&buf != this) { |
| 62 | Construct(buf.data(), buf.length(), buf.length()); |
| 63 | } |
| 64 | return *this; |
| 65 | } |
| 66 | bool operator==(const Buffer& buf) const { |
| 67 | return (length_ == buf.length() && |
| 68 | memcmp(data_.get(), buf.data(), length_) == 0); |
| 69 | } |
| 70 | bool operator!=(const Buffer& buf) const { |
| 71 | return !operator==(buf); |
| 72 | } |
| 73 | |
| 74 | void SetData(const void* data, size_t length) { |
| 75 | ASSERT(data != NULL || length == 0); |
| 76 | SetLength(length); |
| 77 | memcpy(data_.get(), data, length); |
| 78 | } |
| 79 | void AppendData(const void* data, size_t length) { |
| 80 | ASSERT(data != NULL || length == 0); |
| 81 | size_t old_length = length_; |
| 82 | SetLength(length_ + length); |
| 83 | memcpy(data_.get() + old_length, data, length); |
| 84 | } |
| 85 | void SetLength(size_t length) { |
| 86 | SetCapacity(length); |
| 87 | length_ = length; |
| 88 | } |
| 89 | void SetCapacity(size_t capacity) { |
| 90 | if (capacity > capacity_) { |
wu@webrtc.org | 5c9dd59 | 2013-10-25 21:18:33 +0000 | [diff] [blame] | 91 | talk_base::scoped_ptr<char[]> data(new char[capacity]); |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 92 | memcpy(data.get(), data_.get(), length_); |
| 93 | data_.swap(data); |
| 94 | capacity_ = capacity; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | void TransferTo(Buffer* buf) { |
| 99 | ASSERT(buf != NULL); |
| 100 | buf->data_.reset(data_.release()); |
| 101 | buf->length_ = length_; |
| 102 | buf->capacity_ = capacity_; |
| 103 | Construct(NULL, 0, 0); |
| 104 | } |
| 105 | |
| 106 | protected: |
| 107 | void Construct(const void* data, size_t length, size_t capacity) { |
| 108 | data_.reset(new char[capacity_ = capacity]); |
| 109 | SetData(data, length); |
| 110 | } |
| 111 | |
wu@webrtc.org | 5c9dd59 | 2013-10-25 21:18:33 +0000 | [diff] [blame] | 112 | scoped_ptr<char[]> data_; |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 113 | size_t length_; |
| 114 | size_t capacity_; |
| 115 | }; |
| 116 | |
| 117 | } // namespace talk_base |
| 118 | |
| 119 | #endif // TALK_BASE_BUFFER_H_ |