3 * Copyright 2004-2010, Google Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
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.
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,
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21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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28 #ifndef TALK_BASE_BUFFER_H_
29 #define TALK_BASE_BUFFER_H_
33 #include "talk/base/scoped_ptr.h"
37 // Basic buffer class, can be grown and shrunk dynamically.
38 // Unlike std::string/vector, does not initialize data when expanding capacity.
42 Construct(NULL, 0, 0);
44 Buffer(const void* data, size_t length) {
45 Construct(data, length, length);
47 Buffer(const void* data, size_t length, size_t capacity) {
48 Construct(data, length, capacity);
50 Buffer(const Buffer& buf) {
51 Construct(buf.data(), buf.length(), buf.length());
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_; }
60 Buffer& operator=(const Buffer& buf) {
62 Construct(buf.data(), buf.length(), buf.length());
66 bool operator==(const Buffer& buf) const {
67 return (length_ == buf.length() &&
68 memcmp(data_.get(), buf.data(), length_) == 0);
70 bool operator!=(const Buffer& buf) const {
71 return !operator==(buf);
74 void SetData(const void* data, size_t length) {
75 ASSERT(data != NULL || length == 0);
77 memcpy(data_.get(), data, length);
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);
85 void SetLength(size_t length) {
89 void SetCapacity(size_t capacity) {
90 if (capacity > capacity_) {
91 talk_base::scoped_ptr<char[]> data(new char[capacity]);
92 memcpy(data.get(), data_.get(), length_);
98 void TransferTo(Buffer* buf) {
100 buf->data_.reset(data_.release());
101 buf->length_ = length_;
102 buf->capacity_ = capacity_;
103 Construct(NULL, 0, 0);
107 void Construct(const void* data, size_t length, size_t capacity) {
108 data_.reset(new char[capacity_ = capacity]);
109 SetData(data, length);
112 scoped_ptr<char[]> data_;
117 } // namespace talk_base
119 #endif // TALK_BASE_BUFFER_H_