MyGUI_DataStream.cpp

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/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */

#include "MyGUI_Precompiled.h"
#include "MyGUI_DataStream.h"

namespace MyGUI
{

    DataStream::DataStream() :
        mStream(nullptr),
        mSize((size_t) - 1)
    {
    }

    DataStream::DataStream(std::istream* _stream) :
        mStream(_stream),
        mSize((size_t) - 1)
    {
    }

    DataStream::~DataStream()
    {
    }

    size_t DataStream::size()
    {
        if (mStream == nullptr) return 0;
        if (mSize == (size_t) - 1)
        {
            mStream->seekg (0, std::ios::end);
            mSize = (size_t)mStream->tellg();
            mStream->seekg (0, std::ios::beg);
        }
        return mSize;
    }

    bool DataStream::eof()
    {
        return mStream == nullptr ? true : mStream->eof();
    }

    void DataStream::readline(std::string& _source, Char _delim)
    {
        if (mStream == nullptr) return;
        std::getline(*mStream, _source, (char)_delim);
    }

    size_t DataStream::read(void* _buf, size_t _count)
    {
        if (mStream == nullptr) return 0;
        size_t count = std::min(size(), _count);
        mStream->read((char*)_buf, count);
        return count;
    }

} // namespace MyGUI