MyGUI  3.2.0
MyGUI_DataStream.cpp
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00001 
00006 /*
00007     This file is part of MyGUI.
00008 
00009     MyGUI is free software: you can redistribute it and/or modify
00010     it under the terms of the GNU Lesser General Public License as published by
00011     the Free Software Foundation, either version 3 of the License, or
00012     (at your option) any later version.
00013 
00014     MyGUI is distributed in the hope that it will be useful,
00015     but WITHOUT ANY WARRANTY; without even the implied warranty of
00016     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017     GNU Lesser General Public License for more details.
00018 
00019     You should have received a copy of the GNU Lesser General Public License
00020     along with MyGUI.  If not, see <http://www.gnu.org/licenses/>.
00021 */
00022 #include "MyGUI_Precompiled.h"
00023 #include "MyGUI_DataStream.h"
00024 
00025 namespace MyGUI
00026 {
00027 
00028     DataStream::DataStream() :
00029         mStream(nullptr),
00030         mSize((size_t) - 1)
00031     {
00032     }
00033 
00034     DataStream::DataStream(std::istream* _stream) :
00035         mStream(_stream),
00036         mSize((size_t) - 1)
00037     {
00038     }
00039 
00040     DataStream::~DataStream()
00041     {
00042     }
00043 
00044     size_t DataStream::size()
00045     {
00046         if (mStream == nullptr) return 0;
00047         if (mSize == (size_t) - 1)
00048         {
00049             mStream->seekg (0, std::ios::end);
00050             mSize = (size_t)mStream->tellg();
00051             mStream->seekg (0, std::ios::beg);
00052         }
00053         return mSize;
00054     }
00055 
00056     bool DataStream::eof()
00057     {
00058         return mStream == nullptr ? true : mStream->eof();
00059     }
00060 
00061     void DataStream::readline(std::string& _source, Char _delim)
00062     {
00063         if (mStream == nullptr) return;
00064         std::getline(*mStream, _source, (char)_delim);
00065     }
00066 
00067     size_t DataStream::read(void* _buf, size_t _count)
00068     {
00069         if (mStream == nullptr) return 0;
00070         size_t count = std::min(size(), _count);
00071         mStream->read((char*)_buf, count);
00072         return count;
00073     }
00074 
00075 } // namespace MyGUI