LimitedMemoryStream.h

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/****
 * Sming Framework Project - Open Source framework for high efficiency native ESP8266 development.
 * Created 2015 by Skurydin Alexey
 * http://github.com/SmingHub/Sming
 * All files of the Sming Core are provided under the LGPL v3 license.
 *
 * LimitedMemoryStream.h
 *
 ****/

#pragma once

#include "ReadWriteStream.h"

class LimitedMemoryStream : public ReadWriteStream
{
public:
    LimitedMemoryStream(void* buffer, size_t length, size_t available, bool owned)
        : owned(owned), buffer(static_cast<char*>(buffer)), capacity(length),
          writePos(available <= length ? available : length)
    {
    }

    LimitedMemoryStream(size_t length) : LimitedMemoryStream(nullptr, length, 0, false)
    {
    }

    ~LimitedMemoryStream()
    {
        if(owned) {
            delete[] buffer;
        }
    }

    StreamType getStreamType() const override
    {
        return eSST_Memory;
    }

    char* getStreamPointer() const
    {
        return reinterpret_cast<char*>(buffer ? buffer + readPos : nullptr);
    }

    int available() override
    {
        return writePos - readPos;
    }

    uint16_t readMemoryBlock(char* data, int bufSize) override;

    int seekFrom(int offset, SeekOrigin origin) override;

    size_t write(const uint8_t* buffer, size_t size) override;

    bool isFinished() override
    {
        return available() <= 0;
    }

    bool moveString(String& s) override;

private:
    bool owned;
    char* buffer;
    size_t capacity;
    size_t writePos{0};
    size_t readPos{0};
};