AOO410/main/xmlhelp/source/cxxhelp/inc/util/Decompressor.hxx

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