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/*
* Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "third_party/blink/renderer/platform/wtf/shared_buffer.h"
#include <cstddef>
#include <memory>
#include "base/compiler_specific.h"
#include "base/numerics/safe_conversions.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/unicode.h"
#include "third_party/blink/renderer/platform/wtf/text/utf8.h"
#include "third_party/blink/renderer/platform/wtf/wtf_size_t.h"
namespace WTF {
SegmentedBuffer::Iterator& SegmentedBuffer::Iterator::operator++() {
DCHECK(!IsEnd());
++segment_it_;
Init(0);
return *this;
}
SegmentedBuffer::Iterator::Iterator(const SegmentedBuffer* buffer)
: segment_it_(buffer->segments_.end()), buffer_(buffer) {
DCHECK(IsEnd());
}
SegmentedBuffer::Iterator::Iterator(Vector<Segment>::const_iterator segment_it,
size_t offset,
const SegmentedBuffer* buffer)
: segment_it_(segment_it), buffer_(buffer) {
Init(offset);
}
void SegmentedBuffer::Iterator::Init(size_t offset) {
if (IsEnd()) {
value_ = base::span<const char>();
return;
}
value_ = base::span(segment_it_->data()).subspan(offset);
}
void SegmentedBuffer::Append(base::span<const char> data) {
if (data.empty()) {
return;
}
Append(Vector<char>(data));
}
void SegmentedBuffer::Append(Vector<char>&& vector) {
if (vector.empty()) {
return;
}
const size_t start_position = size_;
size_ += vector.size();
segments_.emplace_back(start_position, std::move(vector));
}
void SegmentedBuffer::Clear() {
segments_.clear();
size_ = 0;
}
SegmentedBuffer::Iterator SegmentedBuffer::begin() const {
return GetIteratorAt(static_cast<size_t>(0));
}
SegmentedBuffer::Iterator SegmentedBuffer::end() const {
return Iterator(this);
}
SegmentedBuffer::Iterator SegmentedBuffer::GetIteratorAtInternal(
size_t position) const {
if (position >= size()) {
return cend();
}
Vector<Segment>::const_iterator it = segments_.begin();
if (position < it->data().size()) {
return Iterator(it, position, this);
}
it = std::upper_bound(it, segments_.end(), position,
[](const size_t& position, const Segment& segment) {
return position < segment.start_position();
});
--it;
return Iterator(it, position - it->start_position(), this);
}
bool SegmentedBuffer::GetBytes(base::span<uint8_t> buffer) const {
if (!buffer.data()) {
return false;
}
for (const auto& span : *this) {
if (buffer.empty()) {
break;
}
const size_t to_be_written = std::min(span.size(), buffer.size());
auto [buffer_fragment, rest] = buffer.split_at(to_be_written);
buffer_fragment.copy_from(base::as_bytes(span.first(to_be_written)));
buffer = rest;
}
return buffer.empty();
}
void SegmentedBuffer::GetMemoryDumpNameAndSize(String& dump_name,
size_t& dump_size) const {
dump_name = "/segments";
dump_size = size_;
}
SegmentedBuffer::DeprecatedFlatData::DeprecatedFlatData(
const SegmentedBuffer* buffer)
: buffer_(buffer) {
DCHECK(buffer_);
if (buffer_->segments_.empty()) {
data_ = nullptr;
return;
}
if (buffer_->segments_.size() == 1) {
data_ = buffer_->segments_.begin()->data().data();
return;
}
flat_buffer_ = buffer_->CopyAs<Vector<char>>();
data_ = flat_buffer_.data();
}
Vector<Vector<char>> SegmentedBuffer::TakeData() && {
Vector<Vector<char>> result;
result.ReserveInitialCapacity(segments_.size());
for (auto& segment : segments_) {
result.push_back(std::move(segment.data()));
}
Clear();
return result;
}
SharedBuffer::SharedBuffer() = default;
SharedBuffer::SharedBuffer(base::span<const char> data) {
Append(data);
}
SharedBuffer::SharedBuffer(base::span<const unsigned char> data)
: SharedBuffer(base::as_chars(data)) {}
SharedBuffer::SharedBuffer(SegmentedBuffer&& data)
: SegmentedBuffer(std::move(data)) {}
SharedBuffer::~SharedBuffer() = default;
scoped_refptr<SharedBuffer> SharedBuffer::Create(Vector<char>&& vector) {
scoped_refptr<SharedBuffer> buffer = Create();
buffer->Append(std::move(vector));
return buffer;
}
} // namespace WTF
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