2 Copyright (C) 2001-2006, William Joseph.
5 This file is part of GtkRadiant.
7 GtkRadiant is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 GtkRadiant is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GtkRadiant; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #if !defined(INCLUDED_ZLIBSTREAM_H)
23 #define INCLUDED_ZLIBSTREAM_H
26 #include "idatastream.h"
28 /// \brief A wrapper around an InputStream of data compressed with the zlib deflate algorithm.
30 /// - Uses z_stream to decompress the data stream on the fly.
31 /// - Uses a buffer to reduce the number of times the wrapped stream must be read.
32 class DeflatedInputStream : public InputStream
34 InputStream& m_istream;
36 enum unnamed0 { m_bufsize = 1024 };
37 unsigned char m_buffer[m_bufsize];
40 DeflatedInputStream(InputStream& istream)
43 m_zipstream.zalloc = 0;
44 m_zipstream.zfree = 0;
45 m_zipstream.opaque = 0;
46 m_zipstream.avail_in = 0;
47 inflateInit2(&m_zipstream, -MAX_WBITS);
49 ~DeflatedInputStream()
51 inflateEnd(&m_zipstream);
53 size_type read(byte_type* buffer, size_type length)
55 m_zipstream.next_out = buffer;
56 m_zipstream.avail_out = static_cast<uInt>(length);
57 while(m_zipstream.avail_out != 0)
59 if(m_zipstream.avail_in == 0)
61 m_zipstream.next_in = m_buffer;
62 m_zipstream.avail_in = static_cast<uInt>(m_istream.read(m_buffer, m_bufsize));
64 if(inflate(&m_zipstream, Z_SYNC_FLUSH) != Z_OK)
69 return length - m_zipstream.avail_out;