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FileBuffer.cpp
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72 lines (59 loc) · 2.03 KB
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/*
This file is part of Plugin Manager Plugin for Notepad++
Copyright (C)2009-2010 Dave Brotherstone <davegb@pobox.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "precompiled_headers.h"
#include "libinstall/FileBuffer.h"
using namespace std;
FileBuffer::FileBuffer()
{
_currentBufferStart = 0;
_bufferLength = 0;
}
FileBuffer::FileBuffer(const TCHAR *filename)
{
open(filename);
}
FileBuffer::~FileBuffer()
{
_file.close();
}
void FileBuffer::open(const TCHAR *filename)
{
_file.open(filename);
_buffer.reset(new char[BUFFER_SIZE]);
_file.read(_buffer.get(), BUFFER_SIZE);
_currentBufferStart = 0;
_bufferLength = static_cast<size_t>(_file.gcount());
}
char FileBuffer::getCharAt(size_t position)
{
size_t positionInBuffer = position - _currentBufferStart;
if (positionInBuffer != 0 && positionInBuffer < _bufferLength)
return _buffer.get()[positionInBuffer];
else
{
_currentBufferStart = position - REVERSE_PREFETCH;
if (_currentBufferStart < 0)
_currentBufferStart = 0;
_file.seekg((std::streamoff)_currentBufferStart);
_file.read(_buffer.get(), BUFFER_SIZE);
_bufferLength = static_cast<size_t>(_file.gcount());
positionInBuffer = position - _currentBufferStart;
if (positionInBuffer < _bufferLength && positionInBuffer > 0)
return _buffer.get()[positionInBuffer];
else
return FILEBUFFER_EOF;
}
}