src/framework/XMLBuffer.cpp

/*
 * The Apache Software License, Version 1.1
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 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
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 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
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/**
 * $Log$
 * Revision 1.1  1999/11/09 01:08:29  twl
 * Initial revision
 *
 * Revision 1.2  1999/11/08 20:44:35  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */


// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <util/RuntimeException.hpp>
#include <util/XMLString.hpp>
#include <framework/XMLBuffer.hpp>
#include <memory.h>
#include <string.h>


// ---------------------------------------------------------------------------
//  XMLBuffer: Buffer management
// ---------------------------------------------------------------------------
void XMLBuffer::append(const XMLCh* const chars, const unsigned int count)
{
    unsigned int actualCount = count;
    if (!count)
        actualCount = XMLString::stringLen(chars);
    insureCapacity(actualCount);
    memcpy(&fBuffer[fIndex], chars, actualCount * 2);
    fIndex += actualCount;
}

void XMLBuffer::set(const XMLCh* const chars, const unsigned int count)
{
    unsigned int actualCount = count;
    if (!count)
        actualCount = XMLString::stringLen(chars);
    fIndex = 0;
    insureCapacity(actualCount);
    memcpy(fBuffer, chars, actualCount * 2);
    fIndex = actualCount;
}


// ---------------------------------------------------------------------------
//  XMLBuffer: Private helper methods
// ---------------------------------------------------------------------------
void XMLBuffer::expand()
{
    unsigned int newCap = (unsigned int)(fCapacity * 1.5);

    // Allocate the new buffer
    XMLCh* newBuf = new XMLCh[newCap+1];

    // Copy over the old stuff
    memcpy(newBuf, fBuffer, fCapacity * 2);

    // Clean up old buffer and store new stuff
    delete [] fBuffer;
    fBuffer = newBuf;
    fCapacity = newCap;
}

void XMLBuffer::insureCapacity(const unsigned int extraNeeded)
{
    // If we can handle it, do nothing yet
    if (fIndex + extraNeeded < fCapacity)
        return;

    // Oops, not enough room. Calc new capacity and allocate new buffer
    const unsigned int newCap = (unsigned int)((fIndex + fCapacity) * 1.25);
    XMLCh* newBuf = new XMLCh[newCap+1];

    // Copy over the old stuff
    memcpy(newBuf, fBuffer, fCapacity * 2);

    // Clean up old buffer and store new stuff
    delete [] fBuffer;
    fBuffer = newBuf;
    fCapacity = newCap;
}