zlibstream.h

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/*
 Copyright (C) 2001-2006, William Joseph.
 All Rights Reserved.

 This file is part of GtkRadiant.

 GtkRadiant 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.

 GtkRadiant 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 GtkRadiant; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined(INCLUDED_ZLIBSTREAM_H)
#define INCLUDED_ZLIBSTREAM_H

#include "zlib.h"
#include "idatastream.h"

class DeflatedInputStream: public InputStream
{
        InputStream& m_istream;
        z_stream m_zipstream;
        enum unnamed0
        {
            m_bufsize = 1024
        };
        unsigned char m_buffer[m_bufsize];

    public:
        DeflatedInputStream (InputStream& istream) :
            m_istream(istream)
        {
            m_zipstream.zalloc = 0;
            m_zipstream.zfree = 0;
            m_zipstream.opaque = 0;
            m_zipstream.avail_in = 0;
            inflateInit2(&m_zipstream, -MAX_WBITS);
        }
        ~DeflatedInputStream ()
        {
            inflateEnd(&m_zipstream);
        }

        std::size_t size ()
        {
            return 0;
        }

        size_type read (byte_type* buffer, size_type length)
        {
            m_zipstream.next_out = buffer;
            m_zipstream.avail_out = static_cast<uInt> (length);
            while (m_zipstream.avail_out != 0) {
                if (m_zipstream.avail_in == 0) {
                    m_zipstream.next_in = m_buffer;
                    m_zipstream.avail_in = static_cast<uInt> (m_istream.read(m_buffer, m_bufsize));
                }
                if (inflate(&m_zipstream, Z_SYNC_FLUSH) != Z_OK) {
                    break;
                }
            }
            return length - m_zipstream.avail_out;
        }
};

#endif