/*
 * The Apache Software License, Version 1.1
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 *
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 * reserved.
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 * modification, are permitted provided that the following conditions
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 *       "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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 * 4. The names "<WebSig>" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
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 * 5. Products derived from this software may not be called "Apache",
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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/>.
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/*
 * XSEC
 *
 * XSECBinTXFMInputStream := Implement the BinInputStream around Transforms.
 *
 * Author(s): Berin Lautenbach
 *
 * $ID$
 *
 * $LOG$
 *					 
 */


#include <xsec/utils/XSECBinTXFMInputStream.hpp>
#include <xsec/transformers/TXFMBase.hpp>
#include <xsec/transformers/TXFMChain.hpp>
#include <xsec/framework/XSECError.hpp>

// ---------------------------------------------------------------------------
//  Constructors/Destructors
// ---------------------------------------------------------------------------


XSECBinTXFMInputStream::XSECBinTXFMInputStream(TXFMChain * lst, bool deleteWhenDone) :
mp_txfm(lst->getLastTxfm()),
mp_chain(lst),
m_deleteWhenDone(deleteWhenDone),
m_deleted(false),
m_done(false),
m_currentIndex(0) {

	if (mp_txfm->getOutputType() != TXFMBase::BYTE_STREAM) {

		throw XSECException(XSECException::TransformError,
			"Cannot wrapper a non BYTE_STREAM TXFM with XSECBinTXFMInputStream");

	}

}

XSECBinTXFMInputStream::~XSECBinTXFMInputStream() {

	if (m_deleteWhenDone == true && m_deleted == false) {

		delete mp_chain;
		m_deleted = true;

	}

}

// ---------------------------------------------------------------------------
//  Stream methods
// ---------------------------------------------------------------------------

void XSECBinTXFMInputStream::reset(void) {}

unsigned int XSECBinTXFMInputStream::curPos() const {

	return m_currentIndex;

}

unsigned int XSECBinTXFMInputStream::readBytes(XMLByte* const  toFill, 
					   const unsigned int maxToRead) {

	if (m_done == true)
		return 0;

	unsigned int bytesRead;

	bytesRead = mp_txfm->readBytes(toFill, maxToRead);

	if (bytesRead == 0) {

		if (m_deleteWhenDone) {

			delete mp_chain;
			mp_txfm = 0;
			mp_chain = 0;
			m_deleted = true;

		}

		m_done = true;

	}

	m_currentIndex += bytesRead;

	return bytesRead;

}