/*
 * The Apache Software License, Version 1.1
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 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *        Apache Software Foundation (http://www.apache.org/)."
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
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 * originally based on software copyright (c) 2001, Institute for
 * Data Communications Systems, <http://www.nue.et-inf.uni-siegen.de/>.
 * The development of this software was partly funded by the European 
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/*
 * XSEC
 *
 * TXFMBase64 := Class that performs a Base64 transform
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: TXFMBase64.cpp,v 1.3 2003/03/01 06:27:29 blautenb Exp $
 *
 */

// XSEC

#include <xsec/transformers/TXFMBase64.hpp>
#include <xsec/utils/XSECPlatformUtils.hpp>
#include <xsec/framework/XSECException.hpp>

TXFMBase64::TXFMBase64(DOMDocument *doc) : TXFMBase(doc) {

	m_complete = false;					// Nothing yet to output

	mp_b64 = XSECPlatformUtils::g_cryptoProvider->base64();
	
	if (!mp_b64) {

		throw XSECException(XSECException::CryptoProviderError, 
				"Error requesting Base64 object from Crypto Provider");

	}

	mp_b64->decodeInit();

};

TXFMBase64::~TXFMBase64() {

	if (mp_b64 != NULL)
		delete mp_b64;

};

	// Methods to set the inputs

void TXFMBase64::setInput(TXFMBase *newInput) {

	input = newInput;

	// Set up for comments
	keepComments = input->getCommentsStatus();

}

	// Methods to get tranform output type and input requirement

TXFMBase::ioType TXFMBase64::getInputType(void) {

	return TXFMBase::BYTE_STREAM;

}
TXFMBase::ioType TXFMBase64::getOutputType(void) {

	return TXFMBase::BYTE_STREAM;

}


TXFMBase::nodeType TXFMBase64::getNodeType(void) {

	return TXFMBase::DOM_NODE_NONE;

}

	// Methods to get output data

unsigned int TXFMBase64::readBytes(XMLByte * const toFill, unsigned int maxToFill) {
	
	unsigned int ret, fill;

	if (m_complete)
		return 0;

	fill = (maxToFill > 2000 ? 2000 : maxToFill);

	unsigned int sz = input->readBytes(m_base64Buffer, fill);

	if (sz == 0)
		ret = mp_b64->decodeFinish((unsigned char *) toFill, maxToFill);
	else
		ret = mp_b64->decode(m_base64Buffer, sz, (unsigned char *) toFill, maxToFill);

	if (ret == 0)
		m_complete = true;

	return ret;

}

DOMDocument *TXFMBase64::getDocument() {

	return NULL;

}

DOMNode * TXFMBase64::getFragmentNode() {

	return NULL;		// Return a null node

}

const XMLCh * TXFMBase64::getFragmentId() {

	return NULL;	// Empty string

}