include/paimon/io/byte_array_input_stream.h

/*
 * Copyright 2024-present Alibaba Inc.
 *
 * 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 <cstdint>
#include <functional>
#include <string>

#include "paimon/fs/file_system.h"
#include "paimon/result.h"
#include "paimon/status.h"
#include "paimon/visibility.h"

namespace paimon {
/// Input stream for memory buffer, inherits from `InputStream`.
class PAIMON_EXPORT ByteArrayInputStream : public InputStream {
 public:
    ByteArrayInputStream(const char* buffer, uint64_t length);
    ~ByteArrayInputStream() override = default;

    /// @return The raw data pointer of current pos.
    const char* GetRawData() const;

    Status Seek(int64_t offset, SeekOrigin origin) override;

    Result<int64_t> GetPos() const override {
        return position_;
    }

    Result<int32_t> Read(char* buffer, uint32_t size) override;

    Result<int32_t> Read(char* buffer, uint32_t size, uint64_t offset) override;

    void ReadAsync(char* buffer, uint32_t size, uint64_t offset,
                   std::function<void(Status)>&& callback) override;

    Result<uint64_t> Length() const override {
        return length_;
    }

    Status Close() override;

    Result<std::string> GetUri() const override;

 private:
    const char* buffer_;
    const uint64_t length_;
    int64_t position_;
};
}  // namespace paimon