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malloc_byte_buffer.cpp
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159 lines (127 loc) · 4.83 KB
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/* vim:set ts=2 sw=2 sts=2 et: */
/**
* \author Marcus Holland-Moritz (github@mhxnet.de)
* \copyright Copyright (c) Marcus Holland-Moritz
*
* This file is part of dwarfs.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the “Software”), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include <atomic>
#include <cstring>
#include <stdexcept>
#include <string>
#include <string_view>
#include <dwarfs/malloc_byte_buffer.h>
#include <dwarfs/internal/malloc_buffer.h>
namespace dwarfs {
namespace {
class malloc_byte_buffer_impl : public mutable_byte_buffer_interface {
public:
malloc_byte_buffer_impl() = default;
explicit malloc_byte_buffer_impl(size_t size)
: data_(size) {}
explicit malloc_byte_buffer_impl(std::string_view data)
: data_{data.data(), data.size()} {}
explicit malloc_byte_buffer_impl(std::span<uint8_t const> data)
: data_{data} {}
explicit malloc_byte_buffer_impl(internal::malloc_buffer&& data)
: data_{std::move(data)} {}
size_t size() const override { return data_.size(); }
size_t capacity() const override { return data_.capacity(); }
uint8_t const* data() const override { return data_.data(); }
uint8_t* mutable_data() override { return data_.data(); }
std::span<uint8_t const> span() const override {
return {data_.data(), data_.size()};
}
std::span<uint8_t> mutable_span() override {
return {data_.data(), data_.size()};
}
void clear() override {
assert_not_frozen("clear");
data_.clear();
}
void reserve(size_t size) override {
assert_not_frozen("reserve");
data_.reserve(size);
}
void resize(size_t size) override {
if (frozen() && size > data_.capacity()) {
frozen_error("resize beyond capacity");
}
data_.resize(size);
}
void shrink_to_fit() override {
assert_not_frozen("shrink_to_fit");
data_.shrink_to_fit();
}
void freeze_location() override {
frozen_.test_and_set(std::memory_order_release);
}
void append(void const* data, size_t size) override {
if (frozen() && data_.size() + size > data_.capacity()) {
frozen_error("append beyond capacity");
}
data_.append(data, size);
}
internal::malloc_buffer& raw_buffer() override { return data_; }
private:
void assert_not_frozen(std::string_view what) const {
if (frozen()) {
frozen_error(what);
}
}
void frozen_error(std::string_view what) const {
throw std::runtime_error("operation not allowed on frozen buffer: " +
std::string{what});
}
bool frozen() const { return frozen_.test(std::memory_order_acquire); }
internal::malloc_buffer data_;
std::atomic_flag frozen_{};
};
} // namespace
mutable_byte_buffer malloc_byte_buffer::create() {
return mutable_byte_buffer{std::make_shared<malloc_byte_buffer_impl>()};
}
mutable_byte_buffer malloc_byte_buffer::create(size_t size) {
return mutable_byte_buffer{std::make_shared<malloc_byte_buffer_impl>(size)};
}
mutable_byte_buffer malloc_byte_buffer::create_zeroed(size_t size) {
auto buffer = std::make_shared<malloc_byte_buffer_impl>(size);
std::memset(buffer->mutable_data(), 0, size);
return mutable_byte_buffer{std::move(buffer)};
}
mutable_byte_buffer malloc_byte_buffer::create_reserve(size_t size) {
auto rv = std::make_shared<malloc_byte_buffer_impl>();
rv->reserve(size);
return mutable_byte_buffer{std::move(rv)};
}
mutable_byte_buffer malloc_byte_buffer::create(std::string_view data) {
return mutable_byte_buffer{std::make_shared<malloc_byte_buffer_impl>(data)};
}
mutable_byte_buffer malloc_byte_buffer::create(std::span<uint8_t const> data) {
return mutable_byte_buffer{std::make_shared<malloc_byte_buffer_impl>(data)};
}
mutable_byte_buffer malloc_byte_buffer::create(internal::malloc_buffer&& data) {
return mutable_byte_buffer{
std::make_shared<malloc_byte_buffer_impl>(std::move(data))};
}
} // namespace dwarfs