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

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  30 #ifndef _XMLSEARCH_UTIL_DECOMPRESSOR_HXX_
  31 #define _XMLSEARCH_UTIL_DECOMPRESSOR_HXX_
  32
  33 #ifndef INCLUDED_STL_VECTOR
  34 #include <vector>
  35 #define INCLUDED_STL_VECTOR
  36 #endif
  37 #include <excep/XmlSearchExceptions.hxx>
  38 #include <util/RandomAccessStream.hxx>
  39
  40
  41 namespace xmlsearch {
  42
  43     namespace util {
  44
  45
  46         class CompressorIterator;
  47
  48
  49         class Decompressor
  50         {
  51         public:
  52
  53             Decompressor()
  54                 : toRead_( 0 ),
  55                   path_( 0 )
  56             {
  57             }
  58
  59             virtual ~Decompressor() { }
  60
  61             virtual sal_Int32 getNextByte() = 0;
  62
  63             virtual void initReading()
  64             {
  65                 toRead_ = 0;
  66             }
  67
  68         private:
  69
  70             static const sal_Int32 BitsInByte;
  71             static const sal_Int32 NBits;
  72
  73             sal_Int32 readByte_, toRead_, path_;
  74         };
  75
  76
  77
  78
  79         class StreamDecompressor
  80             : public Decompressor
  81         {
  82         public:
  83
  84             StreamDecompressor( RandomAccessStream* in )
  85                 : in_( in )
  86             {
  87             }
  88
  89             ~StreamDecompressor() { }
  90
  91
  92             virtual sal_Int32 getNextByte();
  93
  94         private:
  95
  96             RandomAccessStream* in_;
  97
  98         };
  99
 100
 101
 102         class ByteArrayDecompressor
 103             : public Decompressor
 104         {
 105         public:
 106
 107             ByteArrayDecompressor( sal_Int32 arrayL,sal_Int8* array,sal_Int32 index )
 108             {
 109                 initReading(array,arrayL,index);
 110             }
 111
 112
 113             ~ByteArrayDecompressor() { }
 114
 115             sal_Int32 bytesRead()
 116             {
 117                 return index_ - index0_;
 118             }
 119
 120
 121             sal_Int32 getNextByte() throw( xmlsearch::excep::XmlSearchException )
 122             {
 123                 if( arrayL_ <= index_ )
 124                     throw  xmlsearch::excep::XmlSearchException(
 125                         rtl::OUString::createFromAscii( "ByteArrayDecompressor->getNextByte()" ) );
 126                 return array_[index_++] & 0xFF;
 127             }
 128
 129
 130         private:
 131
 132             sal_Int32  arrayL_;
 133             sal_Int8   *array_;
 134
 135             sal_Int32  index_,index0_;
 136
 137             using xmlsearch::util::Decompressor::initReading;
 138             void initReading( sal_Int8* array,sal_Int32 arrayL,sal_Int32 index )
 139             {
 140                 arrayL_ = arrayL;
 141                 array_ = array;
 142                 index_ = index0_ = index;
 143                 Decompressor::initReading();
 144             }
 145
 146         };
 147
 148
 149     }
 150
 151 }
 152
 153
 154 #endif