| // 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 btlib { |
| namespace common { |
| |
| size_t ByteBuffer::Copy(MutableByteBuffer* out_buffer, |
| size_t pos, |
| size_t size) const { |
| ZX_ASSERT(out_buffer); |
| ZX_ASSERT_MSG(pos <= this->size(), "invalid offset (pos = %zu)", pos); |
| |
| size_t write_size = std::min(size, this->size() - pos); |
| ZX_ASSERT_MSG(write_size <= out_buffer->size(), |
| "|out_buffer| is not large enough for copy!"); |
| |
| std::memcpy(out_buffer->mutable_data(), data() + pos, write_size); |
| return write_size; |
| } |
| |
| const BufferView ByteBuffer::view(size_t pos, size_t size) const { |
| ZX_ASSERT_MSG(pos <= this->size(), "invalid offset (pos = %zu)", pos); |
| return BufferView(data() + pos, std::min(size, this->size() - pos)); |
| } |
| |
| fxl::StringView ByteBuffer::AsString() const { |
| return fxl::StringView(reinterpret_cast<const char*>(data()), size()); |
| } |
| |
| std::string ByteBuffer::ToString() const { |
| return AsString().ToString(); |
| } |
| |
| void MutableByteBuffer::Write(const uint8_t* data, size_t size, size_t pos) { |
| if (!size) |
| return; |
| |
| ZX_ASSERT(data); |
| ZX_ASSERT_MSG(pos <= this->size(), |
| "invalid offset (pos: %zu, buffer size: %zu", pos, |
| this->size()); |
| ZX_ASSERT_MSG(size <= this->size() - pos, |
| "buffer not large enough! (required: %zu, available: %zu)", |
| size, this->size() - pos); |
| |
| std::memcpy(mutable_data() + pos, data, size); |
| } |
| |
| 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(), "invalid offset (pos = %zu)", pos); |
| return MutableBufferView(mutable_data() + pos, |
| std::min(size, this->size() - pos)); |
| } |
| |
| DynamicByteBuffer::DynamicByteBuffer() : buffer_size_(0u) {} |
| |
| 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(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(const fxl::StringView& string) { |
| size_ = string.size(); |
| bytes_ = reinterpret_cast<const uint8_t*>(string.data()); |
| } |
| |
| 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() : size_(0u), bytes_(nullptr) {} |
| |
| 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() : size_(0u), bytes_(nullptr) {} |
| |
| 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 common |
| } // namespace btlib |