| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "byte_buffer.h" |
| |
| namespace bt { |
| |
| void ByteBuffer::Copy(MutableByteBuffer* out_buffer) const { |
| ZX_ASSERT(out_buffer); |
| CopyRaw(out_buffer->mutable_data(), out_buffer->size(), 0, size()); |
| } |
| |
| void ByteBuffer::Copy(MutableByteBuffer* out_buffer, size_t pos, size_t size) const { |
| ZX_ASSERT(out_buffer); |
| CopyRaw(out_buffer->mutable_data(), out_buffer->size(), pos, size); |
| } |
| |
| BufferView ByteBuffer::view(size_t pos, size_t size) const { |
| ZX_ASSERT_MSG(pos <= this->size(), "offset past buffer (pos: %zu, size: %zu)", pos, this->size()); |
| return BufferView(data() + pos, std::min(size, this->size() - pos)); |
| } |
| |
| std::string_view ByteBuffer::AsString() const { |
| return std::string_view(reinterpret_cast<const char*>(data()), size()); |
| } |
| |
| std::string ByteBuffer::ToString() const { return std::string(AsString()); } |
| |
| std::vector<uint8_t> ByteBuffer::ToVector() const { |
| std::vector<uint8_t> vec(size()); |
| MutableBufferView vec_view(vec.data(), vec.size()); |
| vec_view.Write(*this); |
| return vec; |
| } |
| |
| void ByteBuffer::CopyRaw(void* dst_data, size_t dst_capacity, size_t src_offset, |
| size_t copy_size) const { |
| ZX_ASSERT_MSG(copy_size == 0 || dst_data != nullptr, "%zu byte write to pointer %p", copy_size, |
| dst_data); |
| ZX_ASSERT_MSG(copy_size <= dst_capacity, |
| "destination not large enough (required: %zu, available: %zu)", copy_size, |
| dst_capacity); |
| ZX_ASSERT_MSG(src_offset <= this->size(), |
| "offset exceeds source range (begin: %zu, copy_size: %zu)", src_offset, |
| this->size()); |
| ZX_ASSERT_MSG(std::numeric_limits<size_t>::max() - copy_size >= src_offset, |
| "end of source range overflows size_t (src_offset: %zu, copy_size: %zu)", |
| src_offset, copy_size); |
| ZX_ASSERT_MSG(src_offset + copy_size <= this->size(), |
| "end exceeds source range (end: %zu, copy_size: %zu)", src_offset + copy_size, |
| this->size()); |
| |
| // Data pointers for zero-length buffers are nullptr, over which memcpy has undefined behavior, |
| // even for count = 0. Skip the memcpy invocation in that case. |
| if (copy_size == 0) { |
| return; |
| } |
| std::memcpy(dst_data, data() + src_offset, copy_size); |
| } |
| |
| void MutableByteBuffer::Write(const uint8_t* data, size_t size, size_t pos) { |
| BufferView from(data, size); |
| MutableBufferView to = mutable_view(pos); |
| from.Copy(&to); |
| } |
| |
| void MutableByteBuffer::FillWithRandomBytes() { |
| if (size()) { |
| zx_cprng_draw(mutable_data(), size()); |
| } |
| } |
| |
| MutableBufferView MutableByteBuffer::mutable_view(size_t pos, size_t size) { |
| ZX_ASSERT_MSG(pos <= this->size(), "offset past buffer (pos: %zu, size: %zu)", pos, this->size()); |
| return MutableBufferView(mutable_data() + pos, std::min(size, this->size() - pos)); |
| } |
| |
| DynamicByteBuffer::DynamicByteBuffer() = default; |
| |
| DynamicByteBuffer::DynamicByteBuffer(size_t buffer_size) : buffer_size_(buffer_size) { |
| if (buffer_size == 0) |
| return; |
| buffer_ = std::make_unique<uint8_t[]>(buffer_size); |
| |
| // TODO(armansito): For now this is dumb but we should properly handle the |
| // case when we're out of memory. |
| ZX_ASSERT_MSG(buffer_.get(), "failed to allocate buffer"); |
| } |
| |
| DynamicByteBuffer::DynamicByteBuffer(const ByteBuffer& buffer) |
| : buffer_size_(buffer.size()), |
| buffer_(buffer.size() ? std::make_unique<uint8_t[]>(buffer.size()) : nullptr) { |
| ZX_ASSERT_MSG(!buffer_size_ || buffer_.get(), |
| "|buffer| cannot be nullptr when |buffer_size| is non-zero"); |
| buffer.Copy(this); |
| } |
| |
| DynamicByteBuffer::DynamicByteBuffer(const DynamicByteBuffer& buffer) |
| : DynamicByteBuffer(static_cast<const ByteBuffer&>(buffer)) {} |
| |
| DynamicByteBuffer::DynamicByteBuffer(size_t buffer_size, std::unique_ptr<uint8_t[]> buffer) |
| : buffer_size_(buffer_size), buffer_(std::move(buffer)) { |
| ZX_ASSERT_MSG(!buffer_size_ || buffer_.get(), |
| "|buffer| cannot be nullptr when |buffer_size| is non-zero"); |
| } |
| |
| DynamicByteBuffer::DynamicByteBuffer(DynamicByteBuffer&& other) { |
| buffer_size_ = other.buffer_size_; |
| other.buffer_size_ = 0u; |
| buffer_ = std::move(other.buffer_); |
| } |
| |
| DynamicByteBuffer& DynamicByteBuffer::operator=(DynamicByteBuffer&& other) { |
| buffer_size_ = other.buffer_size_; |
| other.buffer_size_ = 0u; |
| buffer_ = std::move(other.buffer_); |
| return *this; |
| } |
| |
| const uint8_t* DynamicByteBuffer::data() const { return buffer_.get(); } |
| |
| uint8_t* DynamicByteBuffer::mutable_data() { return buffer_.get(); } |
| |
| size_t DynamicByteBuffer::size() const { return buffer_size_; } |
| |
| void DynamicByteBuffer::Fill(uint8_t value) { memset(buffer_.get(), value, buffer_size_); } |
| |
| ByteBuffer::const_iterator DynamicByteBuffer::cbegin() const { return buffer_.get(); } |
| |
| ByteBuffer::const_iterator DynamicByteBuffer::cend() const { return buffer_.get() + buffer_size_; } |
| |
| BufferView::BufferView(const ByteBuffer& buffer, size_t size) { *this = buffer.view(0u, size); } |
| |
| BufferView::BufferView(std::string_view string) { |
| size_ = string.size(); |
| bytes_ = reinterpret_cast<const uint8_t*>(string.data()); |
| } |
| |
| BufferView::BufferView(const std::vector<uint8_t>& vec) : BufferView(vec.data(), vec.size()) {} |
| |
| BufferView::BufferView(const void* bytes, size_t size) |
| : size_(size), bytes_(static_cast<const uint8_t*>(bytes)) { |
| // If |size| non-zero then |bytes| cannot be nullptr. |
| ZX_ASSERT_MSG(!size_ || bytes_, "|bytes_| cannot be nullptr if |size_| > 0"); |
| } |
| |
| BufferView::BufferView() = default; |
| |
| const uint8_t* BufferView::data() const { return bytes_; } |
| |
| size_t BufferView::size() const { return size_; } |
| |
| ByteBuffer::const_iterator BufferView::cbegin() const { return bytes_; } |
| |
| ByteBuffer::const_iterator BufferView::cend() const { return bytes_ + size_; } |
| |
| MutableBufferView::MutableBufferView(MutableByteBuffer* buffer) { |
| ZX_ASSERT(buffer); |
| size_ = buffer->size(); |
| bytes_ = buffer->mutable_data(); |
| } |
| |
| MutableBufferView::MutableBufferView(void* bytes, size_t size) |
| : size_(size), bytes_(static_cast<uint8_t*>(bytes)) { |
| // If |size| non-zero then |bytes| cannot be nullptr. |
| ZX_ASSERT_MSG(!size_ || bytes_, "|bytes_| cannot be nullptr if |size_| > 0"); |
| } |
| |
| MutableBufferView::MutableBufferView() = default; |
| |
| const uint8_t* MutableBufferView::data() const { return bytes_; } |
| |
| size_t MutableBufferView::size() const { return size_; } |
| |
| ByteBuffer::const_iterator MutableBufferView::cbegin() const { return bytes_; } |
| |
| ByteBuffer::const_iterator MutableBufferView::cend() const { return bytes_ + size_; } |
| |
| uint8_t* MutableBufferView::mutable_data() { return bytes_; } |
| |
| void MutableBufferView::Fill(uint8_t value) { memset(bytes_, value, size_); } |
| |
| } // namespace bt |