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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2011 SRI International
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit 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 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit 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 the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#include <System/cmtkCompressedStream.h>
#include <zlib.h>
namespace
cmtk
{
/** \addtogroup System */
//@{
CompressedStream::Zlib::Zlib( const std::string& filename )
{
this->m_GzFile = gzopen( filename.c_str(), CMTK_FILE_MODE );
if ( !this->m_GzFile )
{
throw 0;
}
}
void
CompressedStream::Zlib::Close()
{
gzclose( this->m_GzFile );
}
void
CompressedStream::Zlib::Rewind ()
{
gzrewind( this->m_GzFile );
this->CompressedStream::ReaderBase::Rewind();
}
int
CompressedStream::Zlib::Seek ( const long int offset, int whence )
{
return gzseek( this->m_GzFile, offset, whence );
}
size_t
CompressedStream::Zlib::Read ( void *data, size_t size, size_t count )
{
// See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=587912
// Thanks to Yaroslav Halchenko <debian@onerussian.com> for pointing this out.
#define BIG (((unsigned)(-1)>>2)+1)
size_t result = 0;
size_t total = size * count;
while ( total )
{
unsigned n = (total > BIG) ? BIG : (unsigned)total;
int got = gzread( this->m_GzFile, data, n );
if (got < 0)
return got;
result += got;
total -= got;
data = reinterpret_cast<char*>( data ) + got;
if (got < (int)n)
break;
}
this->m_BytesRead += result;
return result / size;
#undef BIG
}
size_t
CompressedStream::Zlib::StaticSafeWrite ( gzFile file, const void *data, size_t size )
{
#define BIG (((unsigned)(-1)>>2)+1)
size_t result = 0;
while ( size )
{
unsigned n = (size > BIG) ? BIG : (unsigned)size;
int written = gzwrite( file, data, n );
if (written < 0)
return written;
result += written;
size -= written;
data = reinterpret_cast<const char*>( data ) + written;
if (written < (int)n)
break;
}
return result;
}
bool
CompressedStream::Zlib::Get ( char &c)
{
const int data = gzgetc( this->m_GzFile );
if ( data != EOF )
{
c=(char) data;
++this->m_BytesRead;
return true;
}
return false;
}
int
CompressedStream::Zlib::Tell () const
{
return gztell( this->m_GzFile );
}
bool
CompressedStream::Zlib::Feof () const
{
return (gzeof( this->m_GzFile ) != 0);
}
} // namespace cmtk
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