perplex.cpp

symbian 下的helix player源代码

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: perplex.cpp,v 1.5.32.3 2004/07/09 01:48:16 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
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 * the rights, obligations and limitations governing use of the
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 * ***** END LICENSE BLOCK ***** */

//*******************************************************************
//*************************** INCLUDE FILES *************************
//*******************************************************************

#include "perplex.h"
#include "hxassert.h"
#include "hlxclib/string.h"
// #include "hlxclib/stdio.h"
#include "netbyte.h"
#include "hxheap.h"

#ifdef _DEBUG
#undef HX_THIS_FILE
static const char HX_THIS_FILE[] = __FILE__;
#endif

//*******************************************************************
//************************* INTERFACE LISTING ***********************
//*******************************************************************

BEGIN_INTERFACE_LIST(CHXPerplex)
    INTERFACE_LIST_ENTRY(IID_IHXPerplex, IHXPerplex)
END_INTERFACE_LIST

//*******************************************************************
//*************************** CONSTRUCTOR ***************************
//*******************************************************************

CHXPerplex::CHXPerplex()
{
;
}

//*******************************************************************
//*************************** DESTRUCTOR ****************************
//*******************************************************************

CHXPerplex::~CHXPerplex()
{
  ;
}

//*******************************************************************
//*************************** Perplex() *****************************
//*******************************************************************

STDMETHODIMP CHXPerplex::Perplex(IHXBuffer *pInBuf, IHXBuffer *pOutBuf)
{
    UINT32 FinalLen;			    // length of encoded data
    CHXPerplexBuffer pInPBuf;		    // Temp buffer to keep code

    // copy the IRMA Input Buffer into the CHXPerplex Input Buffer
    pInPBuf.SafeMemCopy(0, (const void*) pInBuf->GetBuffer(), (UINT32)pInBuf->GetSize());

    // Make sure the input buffer size is a multiple of 4bytes as 
    // needed by Perplex alg.  Padding with '\0' otherwise.

    UINT32 nAlign = (pInBuf->GetSize()) % sizeof(ULONG32);
    UINT32 Offset = (UINT32)pInBuf->GetSize();
    if (nAlign > 0)
    {
	pInPBuf.EnsureValidOffset(Offset+sizeof(ULONG32)-nAlign);
	for (; nAlign < sizeof(ULONG32); nAlign++)
	{
	    pInPBuf.SetUCHAR(Offset++,0);
	}
    }

    FinalLen = Offset * Perplex_PER_ULONG32 / sizeof(ULONG32);	// calc size of the outout (Perplexed) buffer.

    // alloc mem for final perplexed buffer
    // Add one to length 'cause low level perplex adds
    // a '\0' to the resulting string

    pOutBuf->SetSize(FinalLen+1);

    if (pOutBuf->GetBuffer() == NULL) return(HXR_FAIL);
	
    CHXPerplex::DumpToPerplex((char*)(pOutBuf->GetBuffer()), FinalLen+1, pInPBuf.GetPtr(), Offset);

    return(HXR_OK);
}

//*******************************************************************
//*************************** DePerplex() ***************************
//*******************************************************************

//	Parameters:
//
//		const char* Perplex
//		Pointer to a buffer that contains a Perplexidecimal encoding 
//
//		UCHAR* Bits
//		Pointer to a buffer that will contain decoded bytes of information
//
//		int nSize
//		Input size in bytes

STDMETHODIMP CHXPerplex::DePerplex(IHXBuffer *pInBuf, IHXBuffer *pOutBuf)
{
    const char* pPerplex    = (const char *)pInBuf->GetBuffer();
    UCHAR* Bits		    = NULL;
    UINT32 nSize	    = pInBuf->GetSize();
    if (!nSize)
    {
	pOutBuf->SetSize(0);
	return HXR_OK;
    }

    
    nSize--; 	// -1 is for the extra character added in Perplex
    UINT32	ndxBits;
    UINT32	ndxPerplex = 0;
    ULONG32	temp32;
    UINT32      ulOutSize = 2*nSize+100;
    pOutBuf->SetSize(ulOutSize);	    // Make it bigger since the real size isn't known yet
    Bits = (UCHAR *)pOutBuf->GetBuffer();

    for (ndxBits = 0; ndxPerplex < nSize; )
    {
	temp32 = FromPerplex(&pPerplex[ndxPerplex]);
	ndxPerplex+=Perplex_PER_ULONG32;
	if (ndxBits+4 <= ulOutSize) memcpy(&Bits[ndxBits],&temp32,sizeof(temp32)); /* Flawfinder: ignore */
	ndxBits+=sizeof(temp32);
    }
    pOutBuf->SetSize(ndxBits);
    return HXR_OK;
}


//*******************************************************************
//************************* MapFromPerplex **************************
//*******************************************************************

// Converts appropriate characters for Perplex encoding into a ULONG32.

// A copy of this is kept in in pnmisc\pub\win\pnmisc16.h.  If you change 
// this (which is very unlikely), then be sure to change it there.  
static const char zPerplexChars[] =
	{
	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
	'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
	'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
	'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D',
	'E'
	};

UCHAR CHXPerplex::MapFromPerplex(char Perplex)
{
    UCHAR temp = sizeof(zPerplexChars)/sizeof(zPerplexChars[0]);
    for (UCHAR n = 0; n < temp; n++)
    {
	if (Perplex == zPerplexChars[n]) return n;
    }
    return 0;
}

//*******************************************************************
//*************************** MapToPerplex **************************
//*******************************************************************

//	Converts a digit ordinal to the Perplex digit...

char CHXPerplex::MapToPerplex(UCHAR cPerplex)
{                                                  
#ifdef _DEBUG
    int size_zPerplexChars  = sizeof(zPerplexChars); 
    int size_zPerplexChars0 = sizeof(zPerplexChars[0]);
    HX_ASSERT(cPerplex < size_zPerplexChars/size_zPerplexChars0);
#endif
    return zPerplexChars[cPerplex];
}

//*******************************************************************
//*************************** FromPerplex ***************************
//*******************************************************************

//	Converts appropriate characters for Perplex encoding into a ULONG32.

ULONG32 CHXPerplex::FromPerplex(const char* Perplex)
{
	ULONG32 value = 0;
	ULONG32 PerplexBase = 1;

	for (int n = 0; n < Perplex_PER_ULONG32; n++)
	{
		value += MapFromPerplex(Perplex[n]) * PerplexBase;
		PerplexBase *= Perplex_BASE;
	}

	// Convert to local byte order!
	value = DwToHost(value);

	return value;
}

//*******************************************************************
//**************************** ToPerplex ****************************
//*******************************************************************

//	Converts a ULONG32 into the appropriate characters for Perplex encoding.

void CHXPerplex::ToPerplex(ULONG32 Input, char* pPerplex)
{
    ULONG32 value;
    UCHAR   charValue;

    value = DwToNet(Input); // Convert to net byte order!

    for (int n=0; n < Perplex_PER_ULONG32; n++)
    {
    	charValue   = (UCHAR)(value % Perplex_BASE);
	pPerplex[n] = MapToPerplex(charValue);
	value = value / Perplex_BASE;
    }
}

//*******************************************************************
//*************************** DumpToPerplex *************************
//*******************************************************************

//	Parameters:
//
//		char* pPerplex
//		Pointer to buffer to be filled with Perplexadecimal 

void CHXPerplex::DumpToPerplex(char* pPerplex, UINT32 ulPerplexSize, UCHAR* Bits, UINT32 nSize)
{
    UINT32	ndxBits;
    UINT32	ndxPerplex = 0;
    ULONG32	temp32;

    for (ndxBits = 0; ndxBits < nSize; )
    {
	if (ndxBits+4 <= nSize) memcpy(&temp32,&Bits[ndxBits],sizeof(temp32)); /* Flawfinder: ignore */
	ndxBits+=sizeof(temp32);
	if (ndxPerplex+Perplex_PER_ULONG32 <= ulPerplexSize) ToPerplex(temp32,&pPerplex[ndxPerplex]);
	ndxPerplex+=Perplex_PER_ULONG32;
    }
    pPerplex[ndxPerplex] = '\0';
}


//*******************************************************************
//*****                                                        ******
//*****                                                        ******
//*****                                                        ******
//*****                                                        ******
//*****                                                        ******
//*****                                                        ******
//*****                     CHXPerplexBuffer                   ******
//*****                                                        ******
//*****                                                        ******
//*****                                                        ******
//*****                                                        ******
//*****                                                        ******
//*****                                                        ******
//*******************************************************************

//*******************************************************************
//****************** CHXPerplexBuffer CONSTRUCTOR *******************
//*******************************************************************

CHXPerplexBuffer::CHXPerplexBuffer()
	:  m_nSize(0), m_pData(NULL), m_nGrowBy(DEFAULT_GROW_SIZE)
{
}

//*******************************************************************
//****************** CHXPerplexBuffer CONSTRUCTOR *******************
//*******************************************************************

CHXPerplexBuffer::CHXPerplexBuffer(UINT32 nSize, UINT32 nGrowBy)
	:  m_nSize(0), m_pData(NULL), m_nGrowBy(nGrowBy)
{
	Resize(nSize);
}

//*******************************************************************
//******************* CHXPerplexBuffer DESTRUCTOR *******************
//*******************************************************************

CHXPerplexBuffer::~CHXPerplexBuffer()
{
	Free();