hxinfcod.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: hxinfcod.cpp,v 1.5.32.3 2004/07/09 01:48:15 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * 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
 * RealNetworks.  You may not use this file except in compliance with
 * the RPSL or, if you have a valid RCSL with RealNetworks applicable
 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
 * contents of the file.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
 * portions it created.
 * 
 * This file, and the files included with this file, is distributed
 * and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
 * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
 * ENJOYMENT OR NON-INFRINGEMENT.
 * 
 * Technology Compatibility Kit Test Suite(s) Location:
 *    http://www.helixcommunity.org/content/tck
 * 
 * Contributor(s):
 * 
 * ***** END LICENSE BLOCK ***** */

/****************************************************************************
 *
 * This file contains implementation of classes that support
 * the encoding of raw bytes of upgrade negotiation messages
 * into a clear text representaion of the raw data.
 *
 */

#include "hxinfcod.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


/////////////////////////////////////////////////////////////////////
static UINT16 	FourByteAlign(UINT16 number)
{
	return( ((number+3)>>2)<<2 );
}


//*******************************************************************
// CHXInfoEncoder
//*******************************************************************

// IUnknown interface listing
BEGIN_INTERFACE_LIST(CHXInfoEncoder)
    INTERFACE_LIST_ENTRY(IID_IHXObjOutStream, IHXObjOutStream)
END_INTERFACE_LIST

/////////////////////////////////////////////////////////////////////
CHXInfoEncoder::CHXInfoEncoder()
{
	m_FinalBuffer = NULL;
	m_bFinalBufferAllocFlag = FALSE;
	m_nFinalLen = 0;

	m_nOffset = 0;
}

/////////////////////////////////////////////////////////////////////
// get ptr to encoded data - either the data buffer that's been Dump()'d
// to, or a secondary buffer where data was further encoded (ie,
// Hex'd or perplex'd).
STDMETHODIMP_(const char*) CHXInfoEncoder::GetBuffer()
{
	if (m_FinalBuffer)
		return((char*)m_FinalBuffer);

	return((char*)m_Buffer.GetPtr());
}


/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::GetLength()
{
	if (m_FinalBuffer)
		return(m_nFinalLen);

	return(m_nOffset);
}


/////////////////////////////////////////////////////////////////////
CHXInfoEncoder::~CHXInfoEncoder()
{
	if ( (m_bFinalBufferAllocFlag==TRUE) && (m_FinalBuffer!=NULL) )
    {
		delete [] m_FinalBuffer;
    }
}


/////////////////////////////////////////////////////////////////////
void CHXInfoEncoder::EncodeObj(IHXStreamableObj* pObj)
{
	this->Initialize();
	this->WriteObj(pObj);
}


/////////////////////////////////////////////////////////////////////
void CHXInfoEncoder::PerplexEncodeObj(IHXStreamableObj* pObj)
{
	this->Initialize();
	this->WriteObj(pObj);
	this->Perplex();
}

/////////////////////////////////////////////////////////////////////
BOOL CHXInfoEncoder::Perplex()
{
	// no data to perplex?
	if (m_nOffset==0) return(FALSE);

	// if final buffer already exists, return error.....
	// That means we already did an encoding, and the user should
	// call Initialize() before the encoder is reused.
	if (m_FinalBuffer!=NULL) return(FALSE);

	// Make sure we're 4byte aligned. Needed by Perplex alg.
    UINT32 nAlign =  (m_nOffset) % sizeof(ULONG32);

    if (nAlign > 0)
    {
		m_Buffer.EnsureValidOffset(m_nOffset+sizeof(ULONG32)-nAlign);
		for (; nAlign < sizeof(ULONG32); nAlign++)
		{
			m_Buffer.SetUCHAR(m_nOffset++,0);
		}
    }

	// calc size of Perplexed buffer.
    m_nFinalLen = m_nOffset * Perplex_PER_ULONG32 / sizeof(ULONG32);

	// alloc mem for final perplexed buffer
	// Add one to length 'cause low level perplex adds
	// a '\0' to the resulting string
	m_bFinalBufferAllocFlag = TRUE;
	m_FinalBuffer = new UCHAR[m_nFinalLen+1];
	HX_ASSERT(m_FinalBuffer!=NULL);

    if( m_FinalBuffer==NULL)
    {
		m_nFinalLen=0;
		return(FALSE);
    }
	else
    {
        CHXInfoEncoder::DumpToPerplex((char*)m_FinalBuffer, m_nFinalLen+1, m_Buffer.GetPtr(), m_nOffset);
    }

	return(TRUE);
}


/////////////////////////////////////////////////////////////////////
void CHXInfoEncoder::HexEncodeObj(IHXStreamableObj* pObj)
{
	this->Initialize();
	this->WriteObj(pObj);
	this->Hex();
}

/////////////////////////////////////////////////////////////////////
BOOL CHXInfoEncoder::Hex()
{
	// no data to perplex?
	if (m_nOffset==0) return(FALSE);

	// if final buffer already exists, return error.....
	// That means we already did an encoding, and the user should
	// call Initialize() before the encoder is reused.
	if (m_FinalBuffer!=NULL) return(FALSE);

	// calc size of hexed buffer.
    m_nFinalLen = m_nOffset * 2;

	// alloc mem for final perplexed buffer
	m_bFinalBufferAllocFlag = TRUE;
	// Add one to length 'cause low level perplex adds
	// a '\0' to the resulting string
	m_FinalBuffer = new UCHAR[m_nFinalLen+1];
	HX_ASSERT(m_FinalBuffer!=NULL);

    if( m_FinalBuffer==NULL)
    {
		m_nFinalLen=0;
		return(FALSE);
    }
	else
    {
        CHXInfoEncoder::DumpToHex((char*)m_FinalBuffer, m_Buffer.GetPtr(), m_nOffset);
    }

	return(TRUE);
}


/////////////////////////////////////////////////////////////////////
STDMETHODIMP CHXInfoEncoder::Initialize()
{
	if (m_bFinalBufferAllocFlag==TRUE)
    {
		if (m_FinalBuffer!=NULL)
				delete [] m_FinalBuffer;
    }
	m_bFinalBufferAllocFlag = FALSE;
	m_FinalBuffer = NULL;
	m_nFinalLen    = 0;

	m_Buffer.Free();
	m_nOffset=0;
	
	return(HXR_OK);
}

/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteObj(IHXStreamableObj* pObj) 
{
	UINT32 nLen=this->GetOffset();

	if (pObj->WriteObjToBits(this)==HXR_OK)
		return this->GetOffset()-nLen;

#if 0		
	// reading object
	this->Seek(nLen);
#endif
	return(0);
}

/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteUCHAR(UCHAR nValue)
{
    m_Buffer.SafeMemCopy(m_nOffset,&nValue, sizeof(nValue));
	m_nOffset += sizeof(nValue);
    return sizeof(nValue);
}



/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteUINT16(UINT16 nValue)
{
    UINT16 temp16 = WToNet(nValue);

    m_Buffer.SafeMemCopy(m_nOffset,&temp16, sizeof(temp16));

	m_nOffset += sizeof(temp16);
    return sizeof(temp16);
}

/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteUINT32(UINT32 nValue)
{
    UINT32 temp32 = DwToNet(nValue);

	m_Buffer.SafeMemCopy(m_nOffset, &temp32, sizeof(temp32));

	m_nOffset += sizeof(temp32);
    return sizeof(temp32);
}

/////////////////////////////////////////////////////////////////////
// Dump at a specific position. Doesn't advance offset pointer
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteUINT16At(UINT32 nOffset, UINT16 nValue)
{
    UINT16 temp16 = WToNet(nValue);

	if (m_Buffer.IsValidOffset(nOffset+sizeof(temp16))==TRUE)
    {
    	m_Buffer.MemCopy(nOffset,&temp16, sizeof(temp16));
    }

    return sizeof(temp16);
}

/////////////////////////////////////////////////////////////////////
// Dump at a specific position. Doesn't advance offset pointer
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteUINT32At(UINT32 nOffset, UINT32 nValue)
{
    UINT32 temp32 = DwToNet(nValue);

	if (m_Buffer.IsValidOffset(nOffset+sizeof(temp32))==TRUE)
    {
		m_Buffer.MemCopy(nOffset, &temp32, sizeof(temp32));
    }

    return sizeof(temp32);
}


/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteString(const char* szValue)
{
	if (szValue==NULL)
    {
		szValue="\0";
    }

    UINT32 FieldLen = strlen(szValue);
    HX_ASSERT(FieldLen < 0xFF);

	// ensure the buffer has enough room for us.
	if (m_Buffer.EnsureValidOffset(m_nOffset+FieldLen+1)==TRUE)
    {
		m_Buffer.SetUCHAR(m_nOffset, (UCHAR)FieldLen );
        m_Buffer.MemCopy(m_nOffset + 1, szValue, FieldLen);
    }

    FieldLen ++;	//account for first SIZE byte

	m_nOffset += FieldLen;
    return FieldLen;
}


/////////////////////////////////////////////////////////////////////
// Similar to DumpString, except this one is handy when you need
// to concat 2 or 3 strings and Dump them. Instead of allocating
// a buffer, concating the strings and calling DumpString, use
// this routine instead. It will take 2 or 3 strings as a parameters,
// and dump them concatenated. The original strings are not modified.
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteStringCat(const char* szValue1,const char* szValue2,const char* szValue3)
{
	if (szValue1==NULL) { szValue1="\0"; }
	if (szValue2==NULL) { szValue2="\0"; }
	if (szValue3==NULL) { szValue3="\0"; }

    UINT16 nLen1=strlen(szValue1);
    UINT16 nLen2=strlen(szValue2);
    UINT16 nLen3=strlen(szValue3);

    UINT32 FieldLen = nLen1 + nLen2 + nLen3;

    HX_ASSERT(FieldLen < 0xFF);

	// ensure the buffer has enough room for us.
	if (m_Buffer.EnsureValidOffset(m_nOffset+FieldLen+1)==TRUE)
    {
		m_Buffer.SetUCHAR(m_nOffset, (UCHAR)FieldLen );
		m_nOffset++;

		if (nLen1)
        {
	        m_Buffer.MemCopy(m_nOffset, szValue1, nLen1);
			m_nOffset+=nLen1;
        }

		if (nLen2)
        {
	        m_Buffer.MemCopy(m_nOffset, szValue2, nLen2);
			m_nOffset+=nLen2;
        }

		if (nLen3)
        {
	        m_Buffer.MemCopy(m_nOffset, szValue3, nLen3);
			m_nOffset+=nLen3;
        }
    }

    FieldLen ++;	//account for first SIZE byte
    return FieldLen;
}


/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteLargeString(const char* szValue)
{
	if (szValue==NULL)
    {
		szValue="\0";
    }

	// get the length of the string
    UINT32 FieldLen = strlen(szValue);
    HX_ASSERT(FieldLen < 0xFFFF);

	// dump the size (this increments m_nOffset for us too)
	UINT32 nSize = WriteUINT16((UINT16)FieldLen);

    m_Buffer.SafeMemCopy(m_nOffset, szValue, FieldLen);
	m_nOffset += FieldLen;

    return (FieldLen+nSize);
}


/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteBuffer(const char* szBuffer, UINT32 nSize)
{
	HX_ASSERT(szBuffer!=NULL);

	if (szBuffer!=NULL)
    {
    	m_Buffer.SafeMemCopy(m_nOffset, szBuffer, nSize);
    }

	m_nOffset += nSize;
    return (nSize);
}

#if 0
/////////////////////////////////////////////////////////////////////
STDMETHODIMP_(UINT32) CHXInfoEncoder::WriteUTCTime(UTCTimeRep& TimeRep)
{
	return(this->WriteUINT32( TimeRep.asUTCTimeT() ));

//    return this->WriteString(( TimeRep.asUTCString() );
}
#endif


//*******************************************************************
// CHXInfoDecoder
//*******************************************************************

// IUnknown interface listing
BEGIN_INTERFACE_LIST(CHXInfoDecoder)
    INTERFACE_LIST_ENTRY(IID_IHXObjInStream, IHXObjInStream)
END_INTERFACE_LIST

/////////////////////////////////////////////////////////////////////


BOOL  CHXInfoDecoder::DecodeObj(const UCHAR* buffer, UINT32 nSize, IHXStreamableObj* pObj)
{
	HX_ASSERT(buffer!=NULL);
	if (buffer==NULL)
    {
		return(FALSE);
    }

	this->Initialize();

	// Casting away the const, so we must promise not to mess with the
	// contents...
	m_Buffer = (UCHAR *)buffer;
	m_nDecodedLen = nSize;
	
	// ReadObj returns 0 on failure
	return (this->ReadObj(pObj)>0);
}

/////////////////////////////////////////////////////////////////////
BOOL  CHXInfoDecoder::PerplexDecodeObj(const char* szPerplex, IHXStreamableObj* pObj)
{
	if (szPerplex)
    {
		return this->PerplexDecodeObj(szPerplex,strlen(szPerplex),pObj);
    }
	return(FALSE);
}

/////////////////////////////////////////////////////////////////////
// We'll unperplex the data into our own buffer, then decode the obj.
BOOL  CHXInfoDecoder::PerplexDecodeObj(const char* szPerplex, UINT32 nPlexLen, IHXStreamableObj* pObj)
{
	UINT32 nBitLen  = nPlexLen * sizeof(ULONG32) / Perplex_PER_ULONG32;

	UCHAR* Buffer = new UCHAR[nBitLen + 4];
	HX_ASSERT(Buffer!=NULL);
	if (Buffer==NULL)	return(FALSE);

    UINT32 nBitLenActual = CHXInfoDecoder::SetFromPerplex(szPerplex, Buffer, nBitLen+4, nPlexLen);

	BOOL bRetVal = FALSE;