MyGUI  3.0.1
MyGUI_DataStream.cpp
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1 
7 /*
8  This file is part of MyGUI.
9 
10  MyGUI is free software: you can redistribute it and/or modify
11  it under the terms of the GNU Lesser General Public License as published by
12  the Free Software Foundation, either version 3 of the License, or
13  (at your option) any later version.
14 
15  MyGUI is distributed in the hope that it will be useful,
16  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  GNU Lesser General Public License for more details.
19 
20  You should have received a copy of the GNU Lesser General Public License
21  along with MyGUI. If not, see <http://www.gnu.org/licenses/>.
22 */
23 #include "MyGUI_Precompiled.h"
24 #include "MyGUI_DataStream.h"
25 
26 namespace MyGUI
27 {
28 
30  mStream(nullptr),
31  mSize((size_t)-1)
32  {
33  }
34 
35  DataStream::DataStream(std::istream* _stream) :
36  mStream(_stream),
37  mSize((size_t)-1)
38  {
39  }
40 
42  {
43  }
44 
46  {
47  if (mStream == nullptr) return 0;
48  if (mSize == (size_t)-1)
49  {
50  mStream->seekg (0, std::ios::end);
51  mSize = mStream->tellg();
52  mStream->seekg (0, std::ios::beg);
53  }
54  return mSize;
55  }
56 
58  {
59  return mStream == nullptr ? true : mStream->eof();
60  }
61 
62  void DataStream::readline(std::string& _source, Char _delim)
63  {
64  if (mStream == nullptr) return;
65  std::getline(*mStream, _source, (char)_delim);
66  }
67 
68  size_t DataStream::read(void* _buf, size_t _count)
69  {
70  if (mStream == nullptr) return 0;
71  size_t count = std::min(size(), _count);
72  mStream->read((char*)_buf, count);
73  return count;
74  }
75 
76 } // namespace MyGUI