98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
/*
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This file is part of Mitsuba, a physically based rendering system.
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Copyright (c) 2007-2011 by Wenzel Jakob and others.
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Mitsuba is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License Version 3
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as published by the Free Software Foundation.
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Mitsuba 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(__ZSTREAM_H)
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#define __ZSTREAM_H
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#include <mitsuba/mitsuba.h>
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#include <zlib.h>
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/// Buffer size used to communicate with zlib. The larger the better.
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#define ZSTREAM_BUFSIZE 32768
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MTS_NAMESPACE_BEGIN
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/**
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* \brief Transparent compression/decompression stream based on \c zlib.
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*
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* This class transparently decompresses and compresses reads and writes
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* to a nested stream, respectively.
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*
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* \ingroup libcore
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*/
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class MTS_EXPORT_CORE ZStream : public Stream {
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public:
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// =============================================================
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//! @{ \name Constructors
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// =============================================================
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/// Create a new compression stream
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ZStream(Stream *childStream, int level = Z_DEFAULT_COMPRESSION);
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//! @}
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// =============================================================
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// =============================================================
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//! @{ \name Compression stream-specific features
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// =============================================================
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/// Return the child stream of this compression stream
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inline const Stream *getChildStream() const { return m_childStream.get(); }
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/// Return the child stream of this compression stream
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inline Stream *getChildStream() { return m_childStream; }
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//! @}
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// =============================================================
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// =============================================================
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//! @{ \name Implementation of the Stream interface
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// =============================================================
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void read(void *ptr, size_t size);
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void write(const void *ptr, size_t size);
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void setPos(size_t pos);
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size_t getPos() const;
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size_t getSize() const;
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void truncate(size_t size);
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void flush();
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bool canWrite() const;
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bool canRead() const;
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//! @}
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// =============================================================
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/// Return a string representation
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std::string toString() const;
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MTS_DECLARE_CLASS()
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protected:
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// \brief Virtual destructor
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virtual ~ZStream();
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private:
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ref<Stream> m_childStream;
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z_stream m_deflateStream, m_inflateStream;
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uint8_t m_deflateBuffer[ZSTREAM_BUFSIZE];
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uint8_t m_inflateBuffer[ZSTREAM_BUFSIZE];
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bool m_didWrite;
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};
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MTS_NAMESPACE_END
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#endif /* __ZSTREAM_H */
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