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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef SEEN_INKSCAPE_IO_GZIPSTREAM_H
#define SEEN_INKSCAPE_IO_GZIPSTREAM_H
/**
* @file
* Zlib-enabled input and output streams.
*
* This is a thin wrapper of libz calls, in order
* to provide a simple interface to our developers
* for gzip input and output.
*/
/*
* Authors:
* Bob Jamison <rjamison@titan.com>
*
* Copyright (C) 2004 Inkscape.org
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <vector>
#include "inkscapestream.h"
#include <zlib.h>
namespace Inkscape
{
namespace IO
{
//#########################################################################
//# G Z I P I N P U T S T R E A M
//#########################################################################
/**
* This class is for deflating a gzip-compressed InputStream source
*
*/
class GzipInputStream : public BasicInputStream
{
public:
GzipInputStream(InputStream &sourceStream);
~GzipInputStream() override;
int available() override;
void close() override;
int get() override;
private:
bool load();
int fetchMore();
bool loaded;
unsigned char *outputBuf;
unsigned char *srcBuf;
unsigned long crc;
unsigned long srcCrc;
unsigned long srcSiz;
unsigned long srcLen;
long outputBufPos;
long outputBufLen;
z_stream d_stream;
}; // class GzipInputStream
//#########################################################################
//# G Z I P O U T P U T S T R E A M
//#########################################################################
/**
* This class is for gzip-compressing data going to the
* destination OutputStream
*
*/
class GzipOutputStream : public BasicOutputStream
{
public:
GzipOutputStream(OutputStream &destinationStream);
~GzipOutputStream() override;
void close() override;
void flush() override;
int put(char ch) override;
private:
std::vector<unsigned char> inputBuf;
long totalIn;
long totalOut;
unsigned long crc;
}; // class GzipOutputStream
} // namespace IO
} // namespace Inkscape
#endif /* __INKSCAPE_IO_GZIPSTREAM_H__ */
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