xmlwrite.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: xmlwrite.cpp,v 1.5.32.1 2004/07/19 21:04:07 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
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 * 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
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 * Contributor(s):
 * 
 * ***** END LICENSE BLOCK ***** */

/* 
 * $Id: xmlwrite.cpp,v 1.5.32.1 2004/07/19 21:04:07 hubbe Exp $
 *
 * XMLWriter Class Implementation File
 * -----------------------------------
 * 
 * Author:	Consumer Group
 *		RealNetworks Inc., Copyright (C) 1997, All rights reserved
 *		January 12, 1999
 *
 * Abstraction:
 * This file contains the implementation of the XMLWriter class and all it's 
 * helper classes.
 *
 */

// Includes for this file...
#include "xmlwrite.h"
#include "looseprs.h"
#include "hxslist.h"
#include "chxdataf.h"
#include "hxcom.h"
#include "hxbuffer.h"
#include "hxstrutl.h"
//#include <fcntl.h>


// For debugging...
#include "hxassert.h"
#include "hxheap.h"

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

#define MAX_WRITER_BUFFER 1024

#if defined _WINDOWS
#define WRITER_EOL "\n"
#elif defined _MACINTOSH
#define WRITER_EOL "\r"
#else
#define WRITER_EOL "\n"
#endif


/*
 * XMLWriter
 * ---------
 * Constructor.
 *
 * input:
 * void
 *
 * output:
 * N/A
 *
 */
XMLWriter::XMLWriter(void)
{
}



/*
 * ~XMLWriter
 * ----------
 * Destructor.
 *
 * input:
 * void
 *
 * output:
 * N/A
 *
 */
XMLWriter::~XMLWriter(void)
{
    // Clear it...
    Clear();
}



/*
 * CreateTag
 * ---------
 * Creates a tag in the writer and returns a pointer to it.
 *
 * input:
 * const char *name	    - Name for the tag.
 *
 * output:
 * XMLWriterTag *	    - Pointer to the newly created tag.
 *
 */
XMLWriterTag *
XMLWriter::CreateTag(const char *name)
{
    // Create the tag...
    XMLWriterTag *newTag = new XMLWriterTag;
    HX_ASSERT(newTag != NULL);

    newTag->SetName(name);
    
    // Add the tag to the array...
    m_tags.AddTail(newTag);
    return newTag;
}








/*
 * Write
 * -----
 * Writes all the data to a IHXBuffer object and returns a pointer to the buffer.
 *
 * input:
 * IHXBuffer *		- Pointer to an IHXBuffer.  User must delete it.
 * INT32& length	- Number of characters written out to the buffer.
 *
 * output:
 * BOOL			- TRUE if successful.
 *
 */
BOOL
XMLWriter::Write(IHXBuffer *buffer, INT32& numChars)
{
    HX_ASSERT(buffer != NULL);

    // Get the size required...
    INT32 length = GetLength();

    // Set the size for the buffer...
    buffer->SetSize(length + length/2);

    // Go through the tags and write them to the buffer...
    LISTPOSITION position = m_tags.GetHeadPosition();
    while (position != NULL)
	((XMLWriterTag *)(m_tags.GetNext(position)))->Write(buffer, numChars);

    // Ok..
    return TRUE;
}





/* 
 * GetLength
 * ---------
 * Returns the entire length required for the tree of xml.
 *
 * input:
 * void
 *
 * output:
 * INT32	    - Length to write the xml.
 *
 */
INT32
XMLWriter::GetLength(void) const
{
    INT32 length = 0;
    // Go through the list of tags and sum up their individual lengths....
    LISTPOSITION position = m_tags.GetHeadPosition();
    while (position != NULL)
    {
	XMLWriterTag *tag = (XMLWriterTag *)(m_tags.GetNext(position));
	length += tag->GetLength();
    }
    return length;
}







/* 
 * Clear
 * -----
 * Clear the structure from memory.
 *
 * input:
 * void
 *
 * output:
 * void
 *
 */
void
XMLWriter::Clear(void)
{
    // If there are any tags in the list, delete them...
    LISTPOSITION position = m_tags.GetHeadPosition();
    while(position != NULL)
    {
	delete (XMLWriterTag *)(m_tags.GetNext(position));
    }
}





//*****************************************************************************************************************
// XMLWriterAttribute Implementation
//*****************************************************************************************************************


 
/*
 * XMLWriterAttribute
 * ------------------
 * Writer attribute constructor.
 *
 * input:
 * void
 *
 * output:
 * N/A
 *
 */
XMLWriterAttribute::XMLWriterAttribute(void) : m_name(NULL), m_value(NULL)
{
}

 


/* 
 * ~XMLWriterAttribute
 * -------------------
 * Writer attribute destructor.
 *
 * input:
 * void
 *
 * output:
 * N/A
 *
 */
XMLWriterAttribute::~XMLWriterAttribute(void)
{
    // Delete the strings...
    if (m_name != NULL) delete [] m_name;
    if (m_value != NULL) delete [] m_value;
    m_name = m_value = NULL;
}




/* 
 * Write
 * -----
 * Write to the given buffer.
 *
 * input:
 * IHXBuffer *buffer		    - Buffer to write to.
 * INT32 loc			    - Pointer into the buffer from where to begin to write.
 *
 * output:
 * void
 *
 */
void
XMLWriterAttribute::Write(IHXBuffer *buffer, INT32& loc)
{
    HX_ASSERT(buffer != NULL);
    
    // If either the name or the value are empty, do not write anything out...
    if (m_name == NULL) return;

    // Properly format what we will write out...
    char temp[MAX_WRITER_BUFFER]; /* Flawfinder: ignore */
    temp[0] = '\0';
    char tabs[MAX_WRITER_BUFFER]; /* Flawfinder: ignore */
    tabs[0] = '\0';

    // Create the proper indentation...
    for (INT32 i = 0; i < m_depth; i++)
	SafeStrCat(tabs, "\t", MAX_WRITER_BUFFER);

    // Create the output string...
    SafeSprintf(temp, MAX_WRITER_BUFFER, "%s%s=\"%s\"", tabs, m_name, m_value);

    // Write to file...
    SafeStrCpy((char *)(buffer->GetBuffer()) + loc,  temp, buffer->GetSize()-loc);
    loc += strlen(temp);
}





/*
 * GetLength
 * ---------
 * Returns the length required to print this attribute.
 *
 * input:
 * void
 *
 * output:
 * INT32	    - Length required.
 *
 */
INT32 
XMLWriterAttribute::GetLength(void) const
{
    // Get the lengths of the strings and return their sum...
    INT32 nameLength = strlen(m_name);
    INT32 valueLength = strlen(m_value);
    return m_depth + nameLength + valueLength + 2;
}





/*
 * SetName
 * -------
 * Set the name for the attribute.
 *
 * input:
 * const char *name	    - Name of the attribute.
 *
 * output:
 * void
 *
 */
void 
XMLWriterAttribute::SetName(const char *name)
{
    if (m_name != NULL) delete [] m_name;
    m_name = NULL;
    if (name == NULL) return;
    m_name = new char[strlen(name) + 1];
    strcpy(m_name, name); /* Flawfinder: ignore */
}




/*
 * SetValue
 * --------
 * Set the value for the attribute.
 *
 * input:
 * const char *value		- Value of the attribute.
 *
 * output:
 * void
 *
 */
void
XMLWriterAttribute::SetValue(const char *value)
{
    if (m_value != NULL) delete [] m_value;
    m_value = NULL;
    if (value == NULL) return;
    m_value = new char[strlen(value) + 1];
    strcpy(m_value, value); /* Flawfinder: ignore */
}




//*****************************************************************************************************************
// XMLWriterTag Implementation
//*****************************************************************************************************************



/* 
 * XMLWriterTag
 * ------------
 * Constructor.
 *
 * input:
 * void
 *
 * output:
 * N/A
 *
 */
XMLWriterTag::XMLWriterTag(void) : m_type(XMLPlainTag), m_name(NULL), m_comment(NULL), m_depth(0)
{