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/*
* Copyright (C) 2005-2013 Team XBMC
* http://xbmc.org
*
* 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, 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 XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "File.h"
namespace XBMCAddon
{
namespace xbmcvfs
{
XbmcCommons::Buffer File::readBytes(unsigned long numBytes)
{
DelayedCallGuard dg(languageHook);
int64_t size = file->GetLength();
if ((!numBytes || (((int64_t)numBytes) > size)) && (size >= 0))
numBytes = (unsigned long) size;
XbmcCommons::Buffer ret(numBytes);
if (numBytes == 0)
return ret;
while(ret.remaining() > 0)
{
ssize_t bytesRead = file->Read(ret.curPosition(), ret.remaining());
if (bytesRead <= 0) // we consider this a failure or a EOF, can't tell which,
{ // return whatever we have already.
ret.flip();
return ret;
}
ret.forward(bytesRead);
}
ret.flip();
return ret;
}
bool File::write(XbmcCommons::Buffer& buffer)
{
DelayedCallGuard dg(languageHook);
while (buffer.remaining() > 0)
{
ssize_t bytesWritten = file->Write( buffer.curPosition(), buffer.remaining());
if (bytesWritten == 0) // this could be a failure (see HDFile, and XFileUtils) or
// it could mean something else when a negative number means an error
// (see CCurlFile). There is no consistency so we can only assume we're
// done when we get a 0.
return false;
else if (bytesWritten < 0) // But, if we get something less than zero, we KNOW it's an error.
return false;
buffer.forward(bytesWritten);// Otherwise, we advance the buffer by the amount written.
}
return true;
}
}
}
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