/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 * 

 *      http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/*

 * $Id: BinURLInputStream.hpp 568078 2007-08-21 11:43:25Z amassari $

 */

#if !defined(BINURLINPUTSTREAM_HPP)

#define BINURLINPUTSTREAM_HPP

#include <xercesc/util/XMLURL.hpp>

#include <xercesc/util/XMLExceptMsgs.hpp>

#include <xercesc/util/BinInputStream.hpp>

//

// Forward reference the libWWW constructs here, so as to avoid including

// any of the libWWW headers in this file. Just being careful in isolating

// the files that explicitly need to include the libWWW headers.

//

struct _HTAnchor;

XERCES_CPP_NAMESPACE_BEGIN

//

// This class implements the BinInputStream interface specified by the XML

// parser.

//

class XMLUTIL_EXPORT BinURLInputStream : public BinInputStream

{

public :

    BinURLInputStream(const XMLURL&  urlSource);

    ~BinURLInputStream();

    unsigned int curPos() const;

    unsigned int readBytes

    (

                XMLByte* const  toFill

        , const unsigned int    maxToRead

    );

    void reset();

    unsigned int bytesAvail() const;

private :

    // -----------------------------------------------------------------------

    //  Unimplemented constructors and operators

    // -----------------------------------------------------------------------

    BinURLInputStream(const BinURLInputStream&);

    BinURLInputStream& operator=(const BinURLInputStream&); 

    // -----------------------------------------------------------------------

    //  Private data members

    //

    //  fAnchor

    //      This is the handle that LibWWW returns for the remote file that

    //      is being addressed.

    //  fBuffer

    //      This is the array in which the data is stored after reading it

    //      of the network. The maximum size of this array is decided in the

    //      constructor via a file specific #define.

    //  fBufferIndex

    //      Its the index into fBuffer and points to the next unprocessed

    //      character. When the parser asks for more data to be read of the

    //      stream, then fBuffer[fBufferIndex] is the first byte returned,

    //      unless fBufferIndex equals fBufferSize indicating that all

    //      data in the fBuffer has been processed.

    //  fBufferSize

    //      This represents the extent of valid data in the fBuffer array.

    //  fRemoteFileSize

    //      This stores the size in bytes of the remote file addressed by

    //      this URL input stream.

    //  fBytesProcessed

    //      Its a rolling count of the number of bytes processed off this

    //      input stream. Its only reset back to zero, if the stream is

    //      reset. The maximum value this can have is fRemoteFileSize.

    // -----------------------------------------------------------------------

    struct _HTAnchor*   fAnchor;

    XMLByte*            fBuffer;

    unsigned int        fBufferIndex;

    unsigned int        fBufferSize;

    int                 fRemoteFileSize;

    unsigned int        fBytesProcessed;

    MemoryManager*      fMemoryManager;

};

XERCES_CPP_NAMESPACE_END

#endif // BINURLINPUTSTREAM_HPP