Remove code duplication in GraphicDescriptor for EPS

GraphicFormatDetector and GraphicDescriptor have duplicate format
detection code so now GraphicDescriptor uses GraphicFormatDetector
functions instead to detect the format for EPS files

Change-Id: I108aefc56a0e9215eaeef3ae2a7b4d884f0a5373
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/138208
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
diff --git a/vcl/source/filter/graphicfilter2.cxx b/vcl/source/filter/graphicfilter2.cxx
index 1d08776..01741af 100644
--- a/vcl/source/filter/graphicfilter2.cxx
+++ b/vcl/source/filter/graphicfilter2.cxx
@@ -918,24 +918,12 @@ bool GraphicDescriptor::ImpDetectPSD( SvStream& rStm, bool bExtendedInfo )

bool GraphicDescriptor::ImpDetectEPS( SvStream& rStm, bool )
{
    // check the EPS preview and the file extension
    sal_uInt32  nFirstLong = 0;
    sal_uInt8   nFirstBytes[20] = {};
    bool        bRet = false;

    sal_Int32 nStmPos = rStm.Tell();
    rStm.SetEndian( SvStreamEndian::BIG );
    rStm.ReadUInt32( nFirstLong );
    rStm.SeekRel( -4 );
    rStm.ReadBytes( &nFirstBytes, 20 );

    if ( ( nFirstLong == 0xC5D0D3C6 ) || aPathExt.startsWith( "eps" ) ||
        ( ImplSearchEntry( nFirstBytes, reinterpret_cast<sal_uInt8 const *>("%!PS-Adobe"), 10, 10 )
            && ImplSearchEntry( &nFirstBytes[15], reinterpret_cast<sal_uInt8 const *>("EPS"), 3, 3 ) ) )
    {
        aMetadata.mnFormat = GraphicFileFormat::EPS;
        bRet = true;
    }
    vcl::GraphicFormatDetector aDetector( rStm, aPathExt, false /*bExtendedInfo*/ );
    bool bRet = aDetector.detect();
    bRet &= aDetector.checkEPS();
    if ( bRet )
        aMetadata = aDetector.getMetadata();
    rStm.Seek( nStmPos );
    return bRet;
}