CPP/7zip/ICoder.h

// ICoder.h

#ifndef __ICODER_H
#define __ICODER_H

#include "IStream.h"

#define CODER_INTERFACE(i, x) DECL_INTERFACE(i, 4, x)

CODER_INTERFACE(ICompressProgressInfo, 0x04)
{
  STDMETHOD(SetRatioInfo)(const UInt64 *inSize, const UInt64 *outSize) PURE;
  
  /* (inSize) can be NULL, if unknown
     (outSize) can be NULL, if unknown

  returns:
    S_OK
    E_ABORT  : Break by user
    another error codes
  */
};

CODER_INTERFACE(ICompressCoder, 0x05)
{
  STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream,
      const UInt64 *inSize, const UInt64 *outSize,
      ICompressProgressInfo *progress) PURE;
};

CODER_INTERFACE(ICompressCoder2, 0x18)
{
  STDMETHOD(Code)(ISequentialInStream * const *inStreams, const UInt64 * const *inSizes, UInt32 numInStreams,
      ISequentialOutStream * const *outStreams, const UInt64 * const *outSizes, UInt32 numOutStreams,
      ICompressProgressInfo *progress) PURE;
};

/*
  ICompressCoder::Code
  ICompressCoder2::Code
  
  returns:
    S_OK     : OK
    S_FALSE  : data error (for decoders)
    E_OUTOFMEMORY : memory allocation error
    E_NOTIMPL : unsupported encoding method (for decoders)
    another error code : some error. For example, it can be error code received from inStream or outStream function.
  
  Parameters:
    (inStream != NULL)
    (outStream != NULL)

    if (inSize != NULL)
    {
      Encoders in 7-Zip ignore (inSize).
      Decoder can use (*inSize) to check that stream was decoded correctly.
      Some decoder in 7-Zip check it, if (full_decoding mode was set via ICompressSetFinishMode)
    }

    If it's required to limit the reading from input stream (inStream), it can
      be done with ISequentialInStream implementation.

    if (outSize != NULL)
    {
      Encoders in 7-Zip ignore (outSize).
      Decoder unpacks no more than (*outSize) bytes.
    }
    
    (progress == NULL) is allowed.


  Decoding with Code() function
  -----------------------------
   
  You can request some interfaces before decoding
   - ICompressSetDecoderProperties2
   - ICompressSetFinishMode

  If you need to decode full stream:
  {
    1) try to set full_decoding mode with ICompressSetFinishMode::SetFinishMode(1);
    2) call the Code() function with specified (inSize) and (outSize), if these sizes are known.
  }

  If you need to decode only part of stream:
  {
    1) try to set partial_decoding mode with ICompressSetFinishMode::SetFinishMode(0);
    2) Call the Code() function with specified (inSize = NULL) and specified (outSize).
  }

  Encoding with Code() function
  -----------------------------
  
  You can request some interfaces :
  - ICompressSetCoderProperties   - use it before encoding to set properties
  - ICompressWriteCoderProperties - use it before or after encoding to request encoded properties.

  ICompressCoder2 is used when (numInStreams != 1 || numOutStreams != 1)
     The rules are similar to ICompressCoder rules
*/


namespace NCoderPropID
{
  enum EEnum
  {
    kDefaultProp = 0,
    kDictionarySize,    // VT_UI4
    kUsedMemorySize,    // VT_UI4
    kOrder,             // VT_UI4
    kBlockSize,         // VT_UI4 or VT_UI8
    kPosStateBits,      // VT_UI4
    kLitContextBits,    // VT_UI4
    kLitPosBits,        // VT_UI4
    kNumFastBytes,      // VT_UI4
    kMatchFinder,       // VT_BSTR
    kMatchFinderCycles, // VT_UI4
    kNumPasses,         // VT_UI4
    kAlgorithm,         // VT_UI4
    kNumThreads,        // VT_UI4
    kEndMarker,         // VT_BOOL
    kLevel,             // VT_UI4
    kReduceSize,        // VT_UI8 : it's estimated size of largest data stream that will be compressed
                        //   encoder can use this value to reduce dictionary size and allocate data buffers

    kExpectedDataSize,  // VT_UI8 : for ICompressSetCoderPropertiesOpt :
                        //   it's estimated size of current data stream
                        //   real data size can differ from that size
                        //   encoder can use this value to optimize encoder initialization

    kBlockSize2,        // VT_UI4 or VT_UI8
    kCheckSize,         // VT_UI4 : size of digest in bytes
    kFilter,            // VT_BSTR
    kMemUse             // VT_UI8
  };
}

CODER_INTERFACE(ICompressSetCoderPropertiesOpt, 0x1F)
{
  STDMETHOD(SetCoderPropertiesOpt)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps) PURE;
};

CODER_INTERFACE(ICompressSetCoderProperties, 0x20)
{
  STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps) PURE;
};

/*
CODER_INTERFACE(ICompressSetCoderProperties, 0x21)
{
  STDMETHOD(SetDecoderProperties)(ISequentialInStream *inStream) PURE;
};
*/

CODER_INTERFACE(ICompressSetDecoderProperties2, 0x22)
{
  /* returns:
    S_OK
    E_NOTIMP      : unsupported properties
    E_INVALIDARG  : incorrect (or unsupported) properties
    E_OUTOFMEMORY : memory allocation error
  */
  STDMETHOD(SetDecoderProperties2)(const Byte *data, UInt32 size) PURE;
};

CODER_INTERFACE(ICompressWriteCoderProperties, 0x23)
{
  STDMETHOD(WriteCoderProperties)(ISequentialOutStream *outStream) PURE;
};

CODER_INTERFACE(ICompressGetInStreamProcessedSize, 0x24)
{
  STDMETHOD(GetInStreamProcessedSize)(UInt64 *value) PURE;
};

CODER_INTERFACE(ICompressSetCoderMt, 0x25)
{
  STDMETHOD(SetNumberOfThreads)(UInt32 numThreads) PURE;
};

CODER_INTERFACE(ICompressSetFinishMode, 0x26)
{
  STDMETHOD(SetFinishMode)(UInt32 finishMode) PURE;

  /* finishMode:
    0 : partial decoding is allowed. It's default mode for ICompressCoder::Code(), if (outSize) is defined.
    1 : full decoding. The stream must be finished at the end of decoding. */
};

CODER_INTERFACE(ICompressGetInStreamProcessedSize2, 0x27)
{
  STDMETHOD(GetInStreamProcessedSize2)(UInt32 streamIndex, UInt64 *value) PURE;
};

CODER_INTERFACE(ICompressSetMemLimit, 0x28)
{
  STDMETHOD(SetMemLimit)(UInt64 memUsage) PURE;
};



CODER_INTERFACE(ICompressGetSubStreamSize, 0x30)
{
  STDMETHOD(GetSubStreamSize)(UInt64 subStream, UInt64 *value) PURE;

  /* returns:
    S_OK     : (*value) contains the size or estimated size (can be incorrect size)
    S_FALSE  : size is undefined
    E_NOTIMP : the feature is not implemented

  Let's (read_size) is size of data that was already read by ISequentialInStream::Read().
  The caller should call GetSubStreamSize() after each Read() and check sizes:
    if (start_of_subStream + *value < read_size)
    {
      // (*value) is correct, and it's allowed to call GetSubStreamSize() for next subStream:
      start_of_subStream += *value;
      subStream++;
    }
  */
};

CODER_INTERFACE(ICompressSetInStream, 0x31)
{
  STDMETHOD(SetInStream)(ISequentialInStream *inStream) PURE;
  STDMETHOD(ReleaseInStream)() PURE;
};

CODER_INTERFACE(ICompressSetOutStream, 0x32)
{
  STDMETHOD(SetOutStream)(ISequentialOutStream *outStream) PURE;
  STDMETHOD(ReleaseOutStream)() PURE;
};

/*
CODER_INTERFACE(ICompressSetInStreamSize, 0x33)
{
  STDMETHOD(SetInStreamSize)(const UInt64 *inSize) PURE;
};
*/

CODER_INTERFACE(ICompressSetOutStreamSize, 0x34)
{
  STDMETHOD(SetOutStreamSize)(const UInt64 *outSize) PURE;

  /* That function initializes decoder structures.
     Call this function only for stream version of decoder.
       if (outSize == NULL), then output size is unknown
       if (outSize != NULL), then the decoder must stop decoding after (*outSize) bytes. */
};

CODER_INTERFACE(ICompressSetBufSize, 0x35)
{
  STDMETHOD(SetInBufSize)(UInt32 streamIndex, UInt32 size) PURE;
  STDMETHOD(SetOutBufSize)(UInt32 streamIndex, UInt32 size) PURE;
};

CODER_INTERFACE(ICompressInitEncoder, 0x36)
{
  STDMETHOD(InitEncoder)() PURE;

  /* That function initializes encoder structures.
     Call this function only for stream version of encoder. */
};

CODER_INTERFACE(ICompressSetInStream2, 0x37)
{
  STDMETHOD(SetInStream2)(UInt32 streamIndex, ISequentialInStream *inStream) PURE;
  STDMETHOD(ReleaseInStream2)(UInt32 streamIndex) PURE;
};

/*
CODER_INTERFACE(ICompressSetOutStream2, 0x38)
{
  STDMETHOD(SetOutStream2)(UInt32 streamIndex, ISequentialOutStream *outStream) PURE;
  STDMETHOD(ReleaseOutStream2)(UInt32 streamIndex) PURE;
};

CODER_INTERFACE(ICompressSetInStreamSize2, 0x39)
{
  STDMETHOD(SetInStreamSize2)(UInt32 streamIndex, const UInt64 *inSize) PURE;
};
*/


/*
  ICompressFilter
  Filter() converts as most as possible bytes
     returns: (outSize):
       if (outSize <= size) : Filter have converted outSize bytes
       if (outSize >  size) : Filter have not converted anything.
           and it needs at least outSize bytes to convert one block
           (it's for crypto block algorithms).
*/

#define INTERFACE_ICompressFilter(x) \
  STDMETHOD(Init)() x; \
  STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size) x; \

CODER_INTERFACE(ICompressFilter, 0x40)
{
  INTERFACE_ICompressFilter(PURE);
};


CODER_INTERFACE(ICompressCodecsInfo, 0x60)
{
  STDMETHOD(GetNumMethods)(UInt32 *numMethods) PURE;
  STDMETHOD(GetProperty)(UInt32 index, PROPID propID, PROPVARIANT *value) PURE;
  STDMETHOD(CreateDecoder)(UInt32 index, const GUID *iid, void **coder) PURE;
  STDMETHOD(CreateEncoder)(UInt32 index, const GUID *iid, void **coder) PURE;
};

CODER_INTERFACE(ISetCompressCodecsInfo, 0x61)
{
  STDMETHOD(SetCompressCodecsInfo)(ICompressCodecsInfo *compressCodecsInfo) PURE;
};

CODER_INTERFACE(ICryptoProperties, 0x80)
{
  STDMETHOD(SetKey)(const Byte *data, UInt32 size) PURE;
  STDMETHOD(SetInitVector)(const Byte *data, UInt32 size) PURE;
};

/*
CODER_INTERFACE(ICryptoResetSalt, 0x88)
{
  STDMETHOD(ResetSalt)() PURE;
};
*/

CODER_INTERFACE(ICryptoResetInitVector, 0x8C)
{
  STDMETHOD(ResetInitVector)() PURE;

  /* Call ResetInitVector() only for encoding.
     Call ResetInitVector() before encoding and before WriteCoderProperties().
     Crypto encoder can create random IV in that function. */
};

CODER_INTERFACE(ICryptoSetPassword, 0x90)
{
  STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size) PURE;
};

CODER_INTERFACE(ICryptoSetCRC, 0xA0)
{
  STDMETHOD(CryptoSetCRC)(UInt32 crc) PURE;
};


namespace NMethodPropID
{
  enum EEnum
  {
    kID,
    kName,
    kDecoder,
    kEncoder,
    kPackStreams,
    kUnpackStreams,
    kDescription,
    kDecoderIsAssigned,
    kEncoderIsAssigned,
    kDigestSize
  };
}


#define INTERFACE_IHasher(x) \
  STDMETHOD_(void, Init)() throw() x; \
  STDMETHOD_(void, Update)(const void *data, UInt32 size) throw() x; \
  STDMETHOD_(void, Final)(Byte *digest) throw() x; \
  STDMETHOD_(UInt32, GetDigestSize)() throw() x; \

CODER_INTERFACE(IHasher, 0xC0)
{
  INTERFACE_IHasher(PURE)
};

CODER_INTERFACE(IHashers, 0xC1)
{
  STDMETHOD_(UInt32, GetNumHashers)() PURE;
  STDMETHOD(GetHasherProp)(UInt32 index, PROPID propID, PROPVARIANT *value) PURE;
  STDMETHOD(CreateHasher)(UInt32 index, IHasher **hasher) PURE;
};

extern "C"
{
  typedef HRESULT (WINAPI *Func_GetNumberOfMethods)(UInt32 *numMethods);
  typedef HRESULT (WINAPI *Func_GetMethodProperty)(UInt32 index, PROPID propID, PROPVARIANT *value);
  typedef HRESULT (WINAPI *Func_CreateDecoder)(UInt32 index, const GUID *iid, void **outObject);
  typedef HRESULT (WINAPI *Func_CreateEncoder)(UInt32 index, const GUID *iid, void **outObject);

  typedef HRESULT (WINAPI *Func_GetHashers)(IHashers **hashers);
  
  typedef HRESULT (WINAPI *Func_SetCodecs)(ICompressCodecsInfo *compressCodecsInfo);
}

#endif