// ICoder.h
#ifndef __ICODER_H
#define __ICODER_H
#include "IStream.h"
#define CODER_INTERFACE(i, x) DECL_INTERFACE(i, 4 , x)
CODER_INTERFACE(ICompressProgressInfo, 0 x04)
{
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, 0 x05)
{
STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress) PURE;
};
CODER_INTERFACE(ICompressCoder2, 0 x18)
{
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, 0 x1F)
{
STDMETHOD(SetCoderPropertiesOpt)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps) PURE;
};
CODER_INTERFACE(ICompressSetCoderProperties, 0 x20)
{
STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps) PURE;
};
/*
CODER_INTERFACE ( ICompressSetCoderProperties , 0 x21 )
{
STDMETHOD ( SetDecoderProperties ) ( ISequentialInStream * inStream ) PURE ;
} ;
*/
CODER_INTERFACE(ICompressSetDecoderProperties2, 0 x22)
{
/* 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, 0 x23)
{
STDMETHOD(WriteCoderProperties)(ISequentialOutStream *outStream) PURE;
};
CODER_INTERFACE(ICompressGetInStreamProcessedSize, 0 x24)
{
STDMETHOD(GetInStreamProcessedSize)(UInt64 *value) PURE;
};
CODER_INTERFACE(ICompressSetCoderMt, 0 x25)
{
STDMETHOD(SetNumberOfThreads)(UInt32 numThreads) PURE;
};
CODER_INTERFACE(ICompressSetFinishMode, 0 x26)
{
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, 0 x27)
{
STDMETHOD(GetInStreamProcessedSize2)(UInt32 streamIndex, UInt64 *value) PURE;
};
CODER_INTERFACE(ICompressSetMemLimit, 0 x28)
{
STDMETHOD(SetMemLimit)(UInt64 memUsage) PURE;
};
CODER_INTERFACE(ICompressGetSubStreamSize, 0 x30)
{
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, 0 x31)
{
STDMETHOD(SetInStream)(ISequentialInStream *inStream) PURE;
STDMETHOD(ReleaseInStream)() PURE;
};
CODER_INTERFACE(ICompressSetOutStream, 0 x32)
{
STDMETHOD(SetOutStream)(ISequentialOutStream *outStream) PURE;
STDMETHOD(ReleaseOutStream)() PURE;
};
/*
CODER_INTERFACE ( ICompressSetInStreamSize , 0 x33 )
{
STDMETHOD ( SetInStreamSize ) ( const UInt64 * inSize ) PURE ;
} ;
*/
CODER_INTERFACE(ICompressSetOutStreamSize, 0 x34)
{
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, 0 x35)
{
STDMETHOD(SetInBufSize)(UInt32 streamIndex, UInt32 size) PURE;
STDMETHOD(SetOutBufSize)(UInt32 streamIndex, UInt32 size) PURE;
};
CODER_INTERFACE(ICompressInitEncoder, 0 x36)
{
STDMETHOD(InitEncoder)() PURE;
/* That function initializes encoder structures.
Call this function only for stream version of encoder. */
};
CODER_INTERFACE(ICompressSetInStream2, 0 x37)
{
STDMETHOD(SetInStream2)(UInt32 streamIndex, ISequentialInStream *inStream) PURE;
STDMETHOD(ReleaseInStream2)(UInt32 streamIndex) PURE;
};
/*
CODER_INTERFACE ( ICompressSetOutStream2 , 0 x38 )
{
STDMETHOD ( SetOutStream2 ) ( UInt32 streamIndex , ISequentialOutStream * outStream ) PURE ;
STDMETHOD ( ReleaseOutStream2 ) ( UInt32 streamIndex ) PURE ;
} ;
CODER_INTERFACE ( ICompressSetInStreamSize2 , 0 x39 )
{
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, 0 x40)
{
INTERFACE_ICompressFilter(PURE);
};
CODER_INTERFACE(ICompressCodecsInfo, 0 x60)
{
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, 0 x61)
{
STDMETHOD(SetCompressCodecsInfo)(ICompressCodecsInfo *compressCodecsInfo) PURE;
};
CODER_INTERFACE(ICryptoProperties, 0 x80)
{
STDMETHOD(SetKey)(const Byte *data, UInt32 size) PURE;
STDMETHOD(SetInitVector)(const Byte *data, UInt32 size) PURE;
};
/*
CODER_INTERFACE ( ICryptoResetSalt , 0 x88 )
{
STDMETHOD ( ResetSalt ) ( ) PURE ;
} ;
*/
CODER_INTERFACE(ICryptoResetInitVector, 0 x8C)
{
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, 0 x90)
{
STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size) PURE;
};
CODER_INTERFACE(ICryptoSetCRC, 0 xA0)
{
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, 0 xC0)
{
INTERFACE_IHasher(PURE)
};
CODER_INTERFACE(IHashers, 0 xC1)
{
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
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(vorverarbeitet am 2026-06-11)
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