ByteStream.cpp

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/*
 * This file is a part of the Biology project by eons LLC.
 * Biology (aka Develop Biology) is a framework for approaching software
 * development from a natural sciences perspective.
 *
 * Copyright (C) 2021 Séon O'Shannon & eons LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#include "bio/common/ByteStream.h"
 
namespace bio {
 
ByteStream::ByteStream()
    :
    m_stream(NULL),
    m_typeName(""),
    m_size(0),
    m_holding(false)
{
}
 
ByteStream::ByteStream(const ByteStream& other)
{
    *this = other;
}
 
ByteStream::~ByteStream()
{
    Release();
}
 
void ByteStream::operator=(const ByteStream& other)
{
    Release(); //wipe old state.
 
    if (other.m_holding)
    {
        //We can't free the same memory twice, so we have to allocate a new block for ourselves.
        Set(other);
    }
    else
    {
        m_stream = other.m_stream;
        m_typeName = other.m_typeName;
        m_size = other.m_size;
        m_holding = false;
    }
}
 
bool ByteStream::IsEmpty() const
{
    return !m_stream;
}
 
std::string ByteStream::GetTypeName() const
{
    return m_typeName;
}
 
std::size_t ByteStream::GetSize() const
{
    return m_size;
}
 
void* ByteStream::IKnowWhatImDoing()
{
    return m_stream;
}
 
void ByteStream::Set(const ByteStream& other)
{
    m_stream = std::malloc(other.m_size);
    memcpy(
        m_stream,
        other.m_stream,
        other.m_size
    );
    m_size = other.m_size;
    m_typeName = other.m_typeName;
    m_holding = true;
}
 
void ByteStream::Release()
{
    if (!m_holding)
    {
        return;
    }
    std::free(m_stream);
    m_size = 0;
    m_typeName.clear();
    m_holding = false;
}
 
bool ByteStream::operator==(const ByteStream& other) const
{
    if (m_size != other.m_size || m_typeName != other.m_typeName)
    {
        return false;
    }
    return memcmp(
        m_stream,
        other.m_stream,
        m_size
    ) == 0;
}
 
} //bio namespace