From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../libwebrtc/rtc_base/copy_on_write_buffer.cc     | 127 +++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 third_party/libwebrtc/rtc_base/copy_on_write_buffer.cc

(limited to 'third_party/libwebrtc/rtc_base/copy_on_write_buffer.cc')

diff --git a/third_party/libwebrtc/rtc_base/copy_on_write_buffer.cc b/third_party/libwebrtc/rtc_base/copy_on_write_buffer.cc
new file mode 100644
index 0000000000..d8ab53cb24
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/copy_on_write_buffer.cc
@@ -0,0 +1,127 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/copy_on_write_buffer.h"
+
+#include <stddef.h>
+
+#include "absl/strings/string_view.h"
+
+namespace rtc {
+
+CopyOnWriteBuffer::CopyOnWriteBuffer() : offset_(0), size_(0) {
+  RTC_DCHECK(IsConsistent());
+}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(const CopyOnWriteBuffer& buf)
+    : buffer_(buf.buffer_), offset_(buf.offset_), size_(buf.size_) {}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(CopyOnWriteBuffer&& buf) noexcept
+    : buffer_(std::move(buf.buffer_)), offset_(buf.offset_), size_(buf.size_) {
+  buf.offset_ = 0;
+  buf.size_ = 0;
+  RTC_DCHECK(IsConsistent());
+}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(absl::string_view s)
+    : CopyOnWriteBuffer(s.data(), s.length()) {}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(size_t size)
+    : buffer_(size > 0 ? new RefCountedBuffer(size) : nullptr),
+      offset_(0),
+      size_(size) {
+  RTC_DCHECK(IsConsistent());
+}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(size_t size, size_t capacity)
+    : buffer_(size > 0 || capacity > 0 ? new RefCountedBuffer(size, capacity)
+                                       : nullptr),
+      offset_(0),
+      size_(size) {
+  RTC_DCHECK(IsConsistent());
+}
+
+CopyOnWriteBuffer::~CopyOnWriteBuffer() = default;
+
+bool CopyOnWriteBuffer::operator==(const CopyOnWriteBuffer& buf) const {
+  // Must either be the same view of the same buffer or have the same contents.
+  RTC_DCHECK(IsConsistent());
+  RTC_DCHECK(buf.IsConsistent());
+  return size_ == buf.size_ &&
+         (cdata() == buf.cdata() || memcmp(cdata(), buf.cdata(), size_) == 0);
+}
+
+void CopyOnWriteBuffer::SetSize(size_t size) {
+  RTC_DCHECK(IsConsistent());
+  if (!buffer_) {
+    if (size > 0) {
+      buffer_ = new RefCountedBuffer(size);
+      offset_ = 0;
+      size_ = size;
+    }
+    RTC_DCHECK(IsConsistent());
+    return;
+  }
+
+  if (size <= size_) {
+    size_ = size;
+    return;
+  }
+
+  UnshareAndEnsureCapacity(std::max(capacity(), size));
+  buffer_->SetSize(size + offset_);
+  size_ = size;
+  RTC_DCHECK(IsConsistent());
+}
+
+void CopyOnWriteBuffer::EnsureCapacity(size_t new_capacity) {
+  RTC_DCHECK(IsConsistent());
+  if (!buffer_) {
+    if (new_capacity > 0) {
+      buffer_ = new RefCountedBuffer(0, new_capacity);
+      offset_ = 0;
+      size_ = 0;
+    }
+    RTC_DCHECK(IsConsistent());
+    return;
+  } else if (new_capacity <= capacity()) {
+    return;
+  }
+
+  UnshareAndEnsureCapacity(new_capacity);
+  RTC_DCHECK(IsConsistent());
+}
+
+void CopyOnWriteBuffer::Clear() {
+  if (!buffer_)
+    return;
+
+  if (buffer_->HasOneRef()) {
+    buffer_->Clear();
+  } else {
+    buffer_ = new RefCountedBuffer(0, capacity());
+  }
+  offset_ = 0;
+  size_ = 0;
+  RTC_DCHECK(IsConsistent());
+}
+
+void CopyOnWriteBuffer::UnshareAndEnsureCapacity(size_t new_capacity) {
+  if (buffer_->HasOneRef() && new_capacity <= capacity()) {
+    return;
+  }
+
+  buffer_ =
+      new RefCountedBuffer(buffer_->data() + offset_, size_, new_capacity);
+  offset_ = 0;
+  RTC_DCHECK(IsConsistent());
+}
+
+}  // namespace rtc
-- 
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