// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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 <string.h>

#include <cstddef>

#include <memory>

#include "common/logging.h"

#include "common/status.h"

#include "runtime/thread_context.h"

#include "vec/common/allocator.h"

#include "vec/common/allocator_fwd.h"

namespace doris {

struct ByteBuffer;

using ByteBufferPtr = std::shared_ptr<ByteBuffer>;

struct ByteBuffer : private Allocator<false> {

    static Status allocate(const size_t size, ByteBufferPtr* ptr) {

        RETURN_IF_CATCH_EXCEPTION({ *ptr = ByteBufferPtr(new ByteBuffer(size)); });

        return Status::OK();

    }

    ~ByteBuffer() {

        SCOPED_SWITCH_THREAD_MEM_TRACKER_LIMITER(mem_tracker_);

        Allocator<false>::free(ptr, capacity);

    }

    void put_bytes(const char* data, size_t size) {

        memcpy(ptr + pos, data, size);

        pos += size;

    }

    void get_bytes(char* data, size_t size) {

        memcpy(data, ptr + pos, size);

        pos += size;

        DCHECK(pos <= limit);

    }

    void flip() {

        limit = pos;

        pos = 0;

    }

    size_t remaining() const { return limit - pos; }

    bool has_remaining() const { return limit > pos; }

    char* ptr;

    size_t pos;

    size_t limit;

    size_t capacity;

private:

    ByteBuffer(size_t capacity_)

            : pos(0),

              limit(capacity_),

              capacity(capacity_),

              mem_tracker_(doris::thread_context()->thread_mem_tracker_mgr->limiter_mem_tracker()) {

        ptr = reinterpret_cast<char*>(Allocator<false>::alloc(capacity_));

    }

    std::shared_ptr<MemTrackerLimiter> mem_tracker_;

};

} // namespace doris