72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined( INCLUDED_ZLIBSTREAM_H )
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#define INCLUDED_ZLIBSTREAM_H
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#include "zlib.h"
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#include "idatastream.h"
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/// \brief A wrapper around an InputStream of data compressed with the zlib deflate algorithm.
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///
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/// - Uses z_stream to decompress the data stream on the fly.
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/// - Uses a buffer to reduce the number of times the wrapped stream must be read.
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class DeflatedInputStream : public InputStream {
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InputStream &m_istream;
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z_stream m_zipstream;
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enum unnamed0 { m_bufsize = 1024 };
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unsigned char m_buffer[m_bufsize];
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public:
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DeflatedInputStream(InputStream &istream)
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: m_istream(istream)
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{
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m_zipstream.zalloc = 0;
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m_zipstream.zfree = 0;
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m_zipstream.opaque = 0;
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m_zipstream.avail_in = 0;
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inflateInit2(&m_zipstream, -MAX_WBITS);
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}
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~DeflatedInputStream()
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{
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inflateEnd(&m_zipstream);
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}
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size_type read(byte_type *buffer, size_type length)
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{
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m_zipstream.next_out = buffer;
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m_zipstream.avail_out = static_cast<uInt>( length );
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while (m_zipstream.avail_out != 0) {
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if (m_zipstream.avail_in == 0) {
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m_zipstream.next_in = m_buffer;
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m_zipstream.avail_in = static_cast<uInt>( m_istream.read(m_buffer, m_bufsize));
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}
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if (inflate(&m_zipstream, Z_SYNC_FLUSH) != Z_OK) {
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break;
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}
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}
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return length - m_zipstream.avail_out;
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}
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};
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#endif
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