IOBuf.h

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// Copyright 2024 libsese
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#pragma once
 
#include <sese/Config.h>
#include <sese/io/InputStream.h>
#include <sese/io/PeekableStream.h>
 
#include <list>
 
namespace sese::iocp {
 
struct IOBufNode {
    void *buffer{nullptr};
    size_t read{0};
    size_t size{0};
    const size_t CAPACITY;
 
    explicit IOBufNode(size_t capacity);
 
    ~IOBufNode();
 
    [[nodiscard]] size_t getReadableSize() const noexcept;
 
    [[nodiscard]] size_t getWriteableSize() const noexcept;
};
 
class IOBuf final : public io::InputStream, public io::PeekableStream {
public:
    using Node = std::unique_ptr<IOBufNode>;
    using ListType = std::list<Node>;
 
    void push(Node node);
 
    void clear();
 
    [[nodiscard]] size_t getReadableSize() const noexcept;
 
    [[nodiscard]] size_t getTotalSize() const noexcept;
 
    int64_t read(void *buffer, size_t length) override;
 
    int64_t peek(void *buffer, size_t length) override;
 
    int64_t trunc(size_t length) override;
 
private:
    ListType list;
    ListType::iterator cur;
 
    size_t total{0};
    size_t readed{0};
};
 
} // namespace sese::iocp