xref: /trunk/main/xmlhelp/source/cxxhelp/inc/util/Decompressor.hxx (revision 7b6bd0c4)

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 *
 * 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
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#ifndef _XMLSEARCH_UTIL_DECOMPRESSOR_HXX_
#define _XMLSEARCH_UTIL_DECOMPRESSOR_HXX_

#ifndef INCLUDED_STL_VECTOR
#include <vector>
#define INCLUDED_STL_VECTOR
#endif
#include <excep/XmlSearchExceptions.hxx>
#include <util/RandomAccessStream.hxx>


namespace xmlsearch {

	namespace util {


		class CompressorIterator;


		class Decompressor
		{
		public:

			Decompressor()
				: toRead_( 0 ),
				  path_( 0 )
			{
			}

			virtual ~Decompressor() { }

			virtual sal_Int32 getNextByte() = 0;

			virtual void initReading()
			{
				toRead_ = 0;
			}

		private:

			static const sal_Int32 BitsInByte;
			static const sal_Int32 NBits;

			sal_Int32 readByte_, toRead_, path_;
		};




		class StreamDecompressor
			: public Decompressor
		{
		public:

			StreamDecompressor( RandomAccessStream* in )
				: in_( in )
			{
			}

			~StreamDecompressor() { }


			virtual sal_Int32 getNextByte();

		private:

			RandomAccessStream* in_;

		};



		class ByteArrayDecompressor
			: public Decompressor
		{
		public:

			ByteArrayDecompressor( sal_Int32 arrayL,sal_Int8* array,sal_Int32 index )
			{
				initReading(array,arrayL,index);
			}


			~ByteArrayDecompressor() { }

			sal_Int32 bytesRead()
			{
				return index_ - index0_;
			}


			sal_Int32 getNextByte() throw( xmlsearch::excep::XmlSearchException )
			{
				if( arrayL_ <= index_ )
					throw  xmlsearch::excep::XmlSearchException(
						rtl::OUString::createFromAscii( "ByteArrayDecompressor->getNextByte()" ) );
				return array_[index_++] & 0xFF;
			}


		private:

			sal_Int32  arrayL_;
			sal_Int8   *array_;

			sal_Int32  index_,index0_;

			using xmlsearch::util::Decompressor::initReading;
			void initReading( sal_Int8* array,sal_Int32 arrayL,sal_Int32 index )
			{
				arrayL_ = arrayL;
				array_ = array;
				index_ = index0_ = index;
				Decompressor::initReading();
			}

		};


	}

}


#endif