package/source/zipapi/Inflater.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_package.hxx"
  33 #include <Inflater.hxx>
  34 #ifndef _ZLIB_H
  35 #ifdef SYSTEM_ZLIB
  36 #include <zlib.h>
  37 #else
  38 #include <external/zlib/zlib.h>
  39 #endif
  40 #endif
  41 #include <string.h> // for memset
  42
  43 using namespace com::sun::star::uno;
  44
  45 /** Provides general purpose decompression using the ZLIB library */
  46
  47 Inflater::Inflater(sal_Bool bNoWrap)
  48 : bFinished(sal_False),
  49   bSetParams(sal_False),
  50   bNeedDict(sal_False),
  51   nOffset(0),
  52   nLength(0),
  53   nLastInflateError(0),
  54   pStream(NULL)
  55 {
  56     pStream = new z_stream;
  57     /* memset to 0 to set zalloc/opaque etc */
  58     memset (pStream, 0, sizeof(*pStream));
  59     sal_Int32 nRes;
  60     nRes = inflateInit2(pStream, bNoWrap ? -MAX_WBITS : MAX_WBITS);
  61     switch (nRes)
  62     {
  63         case Z_OK:
  64             break;
  65         case Z_MEM_ERROR:
  66             delete pStream;
  67             break;
  68         case Z_STREAM_ERROR:
  69             delete pStream;
  70             break;
  71         default:
  72             break;
  73     }
  74 }
  75
  76 Inflater::~Inflater()
  77 {
  78     end();
  79 }
  80
  81 void SAL_CALL Inflater::setInput( const Sequence< sal_Int8 >& rBuffer )
  82 {
  83     sInBuffer = rBuffer;
  84     nOffset = 0;
  85     nLength = rBuffer.getLength();
  86 }
  87
  88 sal_Bool SAL_CALL Inflater::needsDictionary(  )
  89 {
  90     return bNeedDict;
  91 }
  92
  93 sal_Bool SAL_CALL Inflater::finished(  )
  94 {
  95     return bFinished;
  96 }
  97
  98 sal_Int32 SAL_CALL Inflater::doInflateSegment( Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
  99 {
 100     if (nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength())
 101     {
 102         // do error handling
 103     }
 104     return doInflateBytes(rBuffer, nNewOffset, nNewLength);
 105 }
 106
 107 void SAL_CALL Inflater::end(  )
 108 {
 109     if (pStream != NULL)
 110     {
 111 #ifdef SYSTEM_ZLIB
 112         inflateEnd(pStream);
 113 #else
 114         z_inflateEnd(pStream);
 115 #endif
 116         delete pStream;
 117     }
 118     pStream = NULL;
 119 }
 120
 121 sal_Int32 Inflater::doInflateBytes (Sequence < sal_Int8 >  &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
 122 {
 123     if ( !pStream )
 124     {
 125         nLastInflateError = Z_STREAM_ERROR;
 126         return 0;
 127     }
 128
 129     nLastInflateError = 0;
 130
 131     pStream->next_in   = ( unsigned char* ) ( sInBuffer.getConstArray() + nOffset );
 132     pStream->avail_in  = nLength;
 133     pStream->next_out  = reinterpret_cast < unsigned char* > ( rBuffer.getArray() + nNewOffset );
 134     pStream->avail_out = nNewLength;
 135
 136 #ifdef SYSTEM_ZLIB
 137     sal_Int32 nResult = ::inflate(pStream, Z_PARTIAL_FLUSH);
 138 #else
 139     sal_Int32 nResult = ::z_inflate(pStream, Z_PARTIAL_FLUSH);
 140 #endif
 141
 142     switch (nResult)
 143     {
 144         case Z_STREAM_END:
 145             bFinished = sal_True;
 146         case Z_OK:
 147             nOffset += nLength - pStream->avail_in;
 148             nLength = pStream->avail_in;
 149             return nNewLength - pStream->avail_out;
 150
 151         case Z_NEED_DICT:
 152             bNeedDict = sal_True;
 153             nOffset += nLength - pStream->avail_in;
 154             nLength = pStream->avail_in;
 155             return 0;
 156
 157         default:
 158             // it is no error, if there is no input or no output
 159             if ( nLength && nNewLength )
 160                 nLastInflateError = nResult;
 161     }
 162
 163     return 0;
 164 }
 165