ec78f1cebc
Will reland in two different commits to preserve git blame history. BUG=webrtc:7634 NOTRY=True TBR=kwiberg@webrtc.org Change-Id: I550da8525aeb9c5b8f96338fcf1c9714f3dcdab1 Reviewed-on: https://chromium-review.googlesource.com/554610 Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18820}
113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
/*
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* Copyright 2016 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/base/copyonwritebuffer.h"
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namespace rtc {
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CopyOnWriteBuffer::CopyOnWriteBuffer() {
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RTC_DCHECK(IsConsistent());
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}
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CopyOnWriteBuffer::CopyOnWriteBuffer(const CopyOnWriteBuffer& buf)
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: buffer_(buf.buffer_) {
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}
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CopyOnWriteBuffer::CopyOnWriteBuffer(CopyOnWriteBuffer&& buf)
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: buffer_(std::move(buf.buffer_)) {
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}
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CopyOnWriteBuffer::CopyOnWriteBuffer(size_t size)
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: buffer_(size > 0 ? new RefCountedObject<Buffer>(size) : nullptr) {
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RTC_DCHECK(IsConsistent());
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}
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CopyOnWriteBuffer::CopyOnWriteBuffer(size_t size, size_t capacity)
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: buffer_(size > 0 || capacity > 0
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? new RefCountedObject<Buffer>(size, capacity)
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: nullptr) {
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RTC_DCHECK(IsConsistent());
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}
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CopyOnWriteBuffer::~CopyOnWriteBuffer() = default;
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bool CopyOnWriteBuffer::operator==(const CopyOnWriteBuffer& buf) const {
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// Must either use the same buffer internally or have the same contents.
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RTC_DCHECK(IsConsistent());
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RTC_DCHECK(buf.IsConsistent());
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return buffer_.get() == buf.buffer_.get() ||
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(buffer_.get() && buf.buffer_.get() &&
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*buffer_.get() == *buf.buffer_.get());
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}
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void CopyOnWriteBuffer::SetSize(size_t size) {
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RTC_DCHECK(IsConsistent());
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if (!buffer_) {
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if (size > 0) {
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buffer_ = new RefCountedObject<Buffer>(size);
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}
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RTC_DCHECK(IsConsistent());
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return;
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}
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// Clone data if referenced.
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if (!buffer_->HasOneRef()) {
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buffer_ = new RefCountedObject<Buffer>(
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buffer_->data(),
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std::min(buffer_->size(), size),
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std::max(buffer_->capacity(), size));
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}
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buffer_->SetSize(size);
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RTC_DCHECK(IsConsistent());
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}
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void CopyOnWriteBuffer::EnsureCapacity(size_t capacity) {
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RTC_DCHECK(IsConsistent());
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if (!buffer_) {
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if (capacity > 0) {
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buffer_ = new RefCountedObject<Buffer>(0, capacity);
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}
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RTC_DCHECK(IsConsistent());
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return;
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} else if (capacity <= buffer_->capacity()) {
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return;
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}
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CloneDataIfReferenced(std::max(buffer_->capacity(), capacity));
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buffer_->EnsureCapacity(capacity);
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RTC_DCHECK(IsConsistent());
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}
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void CopyOnWriteBuffer::Clear() {
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if (!buffer_)
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return;
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if (buffer_->HasOneRef()) {
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buffer_->Clear();
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} else {
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buffer_ = new RefCountedObject<Buffer>(0, buffer_->capacity());
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}
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RTC_DCHECK(IsConsistent());
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}
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void CopyOnWriteBuffer::CloneDataIfReferenced(size_t new_capacity) {
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if (buffer_->HasOneRef()) {
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return;
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}
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buffer_ = new RefCountedObject<Buffer>(buffer_->data(), buffer_->size(),
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new_capacity);
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RTC_DCHECK(IsConsistent());
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}
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} // namespace rtc
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