62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
/*
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Copyright (c) Microsoft Corporation
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All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
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compliance with the License. You may obtain a copy of the License
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at http://www.apache.org/licenses/LICENSE-2.0
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THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER
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EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF
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TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
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See the Apache Version 2.0 License for specific language governing permissions and
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limitations under the License.
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*/
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#pragma once
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#include <dryadvertex.h>
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#include <channeltransform.h>
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#include <fifochannel.h>
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#ifndef Z_PREFIX
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#define Z_PREFIX
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#endif
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#ifdef LINKWITHZLIB
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#include "zlib.h"
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class GzipCompressionChannelTransform : public ChannelTransform
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{
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public:
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GzipCompressionChannelTransform(DryadVertexProgram* vertex, bool gzipHeader, bool optimizeForSpeed);
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virtual ~GzipCompressionChannelTransform();
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virtual DrError Start(FifoChannel *channel);
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virtual void SetOutputBufferSize(UInt32 bufferSize);
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virtual DrError ProcessItem(DataBlockItem *item);
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virtual DrError Finish(bool atEndOfStream);
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private:
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void AllocateOutputBuffer();
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void AppendOutputByte(byte value);
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void IncrementOutputPosition(UInt32 increment);
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DrError ProcessBlock();
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void WriteOutputBuffer();
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void WriteGzipHeader();
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bool m_firstReadProcessed;
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UInt32 m_crc;
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int m_zlibArg;
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byte *m_crcStart;
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FifoChannel *m_channel;
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UInt32 m_writeSize;
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z_stream m_stream;
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DrRef<DataBlockItem> m_outputBuffer;
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bool m_gzipHeader;
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bool m_optimizeForSpeed;
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CRITSEC m_critsec;
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};
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#endif |