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5697b3dece
although the feature still calling as "experimental", but zstd uses this in its own client since v.1.4 IIRC and the only known drawback would be significant regress of compression ration if guess considerably underestimates, but it does no matter in case of known file size.
91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
// (C) 2016 - 2018 Tino Reichardt
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#define ZSTD_STATIC_LINKING_ONLY
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#include "../../../C/Alloc.h"
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#include "../../../C/Threads.h"
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#include "../../../C/zstd/zstd.h"
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#include "../../Common/Common.h"
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#include "../../Common/MyCom.h"
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#include "../ICoder.h"
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#include "../Common/StreamUtils.h"
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#ifndef EXTRACT_ONLY
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namespace NCompress {
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namespace NZSTD {
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struct CProps
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{
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CProps() { clear (); }
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void clear ()
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{
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memset(this, 0, sizeof (*this));
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_ver_major = ZSTD_VERSION_MAJOR;
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_ver_minor = ZSTD_VERSION_MINOR;
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_level = 3;
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}
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Byte _ver_major;
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Byte _ver_minor;
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Byte _level;
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Byte _reserved[2];
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};
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class CEncoder:
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public ICompressCoder,
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public ICompressSetCoderMt,
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public ICompressSetCoderProperties,
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public ICompressWriteCoderProperties,
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public CMyUnknownImp
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{
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CProps _props;
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ZSTD_CCtx* _ctx;
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void* _srcBuf;
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void* _dstBuf;
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size_t _srcBufSize;
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size_t _dstBufSize;
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UInt64 _processedIn;
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UInt64 _processedOut;
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UInt32 _numThreads;
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/* zstd advanced compression options */
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Int32 _Long;
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Int32 _Level;
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Int32 _Strategy;
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Int32 _WindowLog;
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Int32 _HashLog;
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Int32 _ChainLog;
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Int32 _SearchLog;
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Int32 _MinMatch;
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Int32 _TargetLen;
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Int32 _OverlapLog;
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Int32 _LdmHashLog;
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Int32 _LdmMinMatch;
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Int32 _LdmBucketSizeLog;
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Int32 _LdmHashRateLog;
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public:
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UInt64 unpackSize;
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MY_QUERYINTERFACE_BEGIN2(ICompressCoder)
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MY_QUERYINTERFACE_ENTRY(ICompressSetCoderMt)
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MY_QUERYINTERFACE_ENTRY(ICompressSetCoderProperties)
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MY_QUERYINTERFACE_ENTRY(ICompressWriteCoderProperties)
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MY_QUERYINTERFACE_END
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MY_ADDREF_RELEASE
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STDMETHOD (Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
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STDMETHOD (SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps);
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STDMETHOD (WriteCoderProperties)(ISequentialOutStream *outStream);
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STDMETHOD (SetNumberOfThreads)(UInt32 numThreads);
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CEncoder();
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virtual ~CEncoder();
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};
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}}
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#endif
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