MemStream.h

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/*  Copyright (C) 2003-2021 Free Electron Organization
    Any use of this software requires a license.  If a valid license
    was not distributed with this file, visit freeelectron.org. */

/** @file */


/**************************************************************************//**
    @brief Implementation of std::istream for raw byte buffer

    @ingroup core

    Usage:
    @code
        MemStream memstream(pBuffer, bufferSize);
    @endcode

    See https://tuttlem.github.io/2014/08/18/getting-istream-to-work-off-a-byte-array.html
*//***************************************************************************/
class MemStream: public std::istream
{
    private:

    class MemBuf: public std::basic_streambuf<char>
    {
        public:
                    MemBuf(const uint8_t *p, size_t l)
                    {
                        setg((char*)p, (char*)p, (char*)p + l);
                    }

    };

    public:
                MemStream(const uint8_t *p, size_t l):
                    std::istream(&m_memBuf),
                    m_memBuf(p, l)
                {
                    rdbuf(&m_memBuf);
                }

        MemBuf m_memBuf;
};