129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
/* Copyright (c) Microsoft Corporation.
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Licensed under the MIT License. */
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/* Copyright (c) Microsoft Corporation.
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Licensed under the MIT License. */
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/***************************************************************************
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Author: ShonK
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Project: Kauai
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Copyright (c) Microsoft Corporation
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Compression/decompression manager and default Kauai codec.
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***************************************************************************/
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#ifndef CODEC_H
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#define CODEC_H
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/***************************************************************************
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Codec object.
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***************************************************************************/
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typedef class CODC *PCODC;
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#define CODC_PAR BASE
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#define kclsCODC 'CODC'
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class CODC : public CODC_PAR
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{
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RTCLASS_DEC
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public:
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// return whether this codec can handle the given format.
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virtual bool FCanDo(bool fEncode, long cfmt) = 0;
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// Decompression should be extremely fast. Compression may be
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// (painfully) slow.
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virtual bool FConvert(bool fEncode, long cfmt, void *pvSrc, long cbSrc,
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void *pvDst, long cbDst, long *pcbDst) = 0;
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};
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/***************************************************************************
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Codec manager.
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***************************************************************************/
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typedef class CODM *PCODM;
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#define CODM_PAR BASE
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#define kclsCODM 'CODM'
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class CODM : public CODM_PAR
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{
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RTCLASS_DEC
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ASSERT
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MARKMEM
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protected:
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long _cfmtDef;
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PCODC _pcodcDef;
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PGL _pglpcodc;
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virtual bool _FFindCodec(bool fEncode, long cfmt, PCODC *ppcodc);
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virtual bool _FCodePhq(long cfmt, HQ *phq);
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virtual bool _FCode(long cfmt, void *pvSrc, long cbSrc,
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void *pvDst, long cbDst, long *pcbDst);
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public:
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CODM(PCODC pcodc, long cfmt);
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~CODM(void);
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long CfmtDefault(void)
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{ return _cfmtDef; }
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void SetCfmtDefault(long cfmt);
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virtual bool FRegisterCodec(PCODC pcodc);
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virtual bool FCanDo(long cfmt, bool fEncode);
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// Gets the type of compression used on the block (assuming it is
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// compressed).
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virtual bool FGetCfmtFromBlck(PBLCK pblck, long *pcfmt);
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// FDecompress allows pvDst to be nil (in which case *pcbDst is filled
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// in with the buffer size required).
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// FCompress also allows pvDst to be nil, but the value returned in
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// *pcbDst will just be cbSrc - 1.
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bool FDecompressPhq(HQ *phq)
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{ return _FCodePhq(cfmtNil, phq); }
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bool FCompressPhq(HQ *phq, long cfmt = cfmtNil)
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{ return _FCodePhq(cfmtNil == cfmt ? _cfmtDef : cfmt, phq); }
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bool FDecompress(void *pvSrc, long cbSrc,
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void *pvDst, long cbDst, long *pcbDst)
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{
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return _FCode(cfmtNil, pvSrc, cbSrc, pvDst, cbDst, pcbDst);
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}
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bool FCompress(void *pvSrc, long cbSrc,
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void *pvDst, long cbDst, long *pcbDst, long cfmt = cfmtNil)
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{
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return _FCode(cfmtNil == cfmt ? _cfmtDef : cfmt,
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pvSrc, cbSrc, pvDst, cbDst, pcbDst);
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}
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};
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/***************************************************************************
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The standard Kauai Codec object.
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***************************************************************************/
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typedef class KCDC *PKCDC;
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#define KCDC_PAR CODC
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#define kclsKCDC 'KCDC'
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class KCDC : public KCDC_PAR
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{
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RTCLASS_DEC
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protected:
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bool _FEncode(void *pvSrc, long cbSrc, void *pvDst, long cbDst,
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long *pcbDst);
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bool _FDecode(void *pvSrc, long cbSrc, void *pvDst, long cbDst,
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long *pcbDst);
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bool _FEncode2(void *pvSrc, long cbSrc, void *pvDst, long cbDst,
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long *pcbDst);
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bool _FDecode2(void *pvSrc, long cbSrc, void *pvDst, long cbDst,
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long *pcbDst);
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public:
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virtual bool FCanDo(bool fEncode, long cfmt)
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{ return kcfmtKauai2 == cfmt || kcfmtKauai == cfmt; }
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virtual bool FConvert(bool fEncode, long cfmt, void *pvSrc, long cbSrc,
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void *pvDst, long cbDst, long *pcbDst);
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};
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#endif //!CODEC_H
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