tdf#74299: improve DXF import

1. Now there's no fixed string length limit; see
http://www.autodesk.com/techpubs/autocad/acad2000/dxf/group_code_value_types_dxf_01.htm
The Autodesk's own DXF reference is inconsistent on this matter;
the "Group Code Value Types Reference" tells opposite to "About Group
Codes in DXF Files".
AutoCAD itself easily creates lines 10 000+ characters long!

This removes the hardcoded line length limit; also simplifies
internal struct DXFGroupReader used to parse DXF codes.

2. Improved text import: honor unicode strings in AutoCAD 2007+ DXF;
use more $DWGCODEPAGE values (note: when more codepages will be
discovered, they should be handled in DXFRepresentation::ReadHeader()).
Use LO locale when DXF doesn't specify one. Handle AutoCAD character
names.

3. General fixes & simplifications.

Change-Id: Ifde08978e2da7511696100520732bd76c1a660bb
Reviewed-on: https://gerrit.libreoffice.org/15627
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

8 files changed, 282 insertions, 335 deletions

diff --git a/filter/source/graphicfilter/idxf/dxf2mtf.cxx b/filter/source/graphicfilter/idxf/dxf2mtf.cxx
index ffca879871cb..d02c38913b27 100644
--- a/filter/source/graphicfilter/idxf/dxf2mtf.cxx
+++ b/filter/source/graphicfilter/idxf/dxf2mtf.cxx
@@ -427,8 +427,7 @@ void DXF2GDIMetaFile::DrawTextEntity(const DXFTextEntity & rE, const DXFTransfor
     aT.TransDir(DXFVector(1,0,0),aV);
     if ( SetFontAttribute( rE,nAng, nHeight, aV. Abs() ) )
     {
-        OUString const aUString(
-                OStringToOUString(rE.m_sText, pDXF->getTextEncoding()));
+        OUString const aUString(pDXF->ToOUString(rE.m_sText, true));
         aT.Transform( DXFVector( 0, 0, 0 ), aPt );
         pVirDev->DrawText( aPt, aUString );
     }
@@ -486,8 +485,7 @@ void DXF2GDIMetaFile::DrawAttribEntity(const DXFAttribEntity & rE, const DXFTran
         aT.TransDir(DXFVector(1,0,0),aV);
         if (SetFontAttribute(rE,nAng,nHeight,aV.Abs()))
         {
-            OUString const aUString(
-                    OStringToOUString(rE.m_sText, pDXF->getTextEncoding()));
+            OUString const aUString(pDXF->ToOUString(rE.m_sText, true));
             aT.Transform( DXFVector( 0, 0, 0 ), aPt );
             pVirDev->DrawText( aPt, aUString );
         }
diff --git a/filter/source/graphicfilter/idxf/dxfblkrd.cxx b/filter/source/graphicfilter/idxf/dxfblkrd.cxx
index d84a2fac3454..00f8e4f4fee5 100644
--- a/filter/source/graphicfilter/idxf/dxfblkrd.cxx
+++ b/filter/source/graphicfilter/idxf/dxfblkrd.cxx
@@ -53,13 +53,13 @@ void DXFBlock::Read(DXFGroupReader & rDGR)
     {
         switch (rDGR.GetG())
         {
-            case  2: m_sName = OString(rDGR.GetS()); break;
-            case  3: m_sAlsoName = OString(rDGR.GetS()); break;
+            case  2: m_sName = rDGR.GetS(); break;
+            case  3: m_sAlsoName = rDGR.GetS(); break;
             case 70: nFlags=rDGR.GetI(); break;
             case 10: aBasePoint.fx=rDGR.GetF(); break;
             case 20: aBasePoint.fy=rDGR.GetF(); break;
             case 30: aBasePoint.fz=rDGR.GetF(); break;
-            case  1: m_sXRef = OString(rDGR.GetS()); break;
+            case  1: m_sXRef = rDGR.GetS(); break;
         }
     }
     DXFEntities::Read(rDGR);
@@ -92,9 +92,9 @@ void DXFBlocks::Read(DXFGroupReader & rDGR)
 
     for (;;) {
         while (rDGR.GetG()!=0) rDGR.Read();
-        if (strcmp(rDGR.GetS(),"ENDSEC")==0 ||
-            strcmp(rDGR.GetS(),"EOF")==0) break;
-        if (strcmp(rDGR.GetS(),"BLOCK")==0) {
+        if (rDGR.GetS() == "ENDSEC" ||
+            rDGR.GetS() == "EOF") break;
+        if (rDGR.GetS() == "BLOCK") {
             pB=new DXFBlock;
             pB->Read(rDGR);
             *ppSucc=pB;
diff --git a/filter/source/graphicfilter/idxf/dxfentrd.cxx b/filter/source/graphicfilter/idxf/dxfentrd.cxx
index 3966e1cca7ea..0291d5be8f85 100644
--- a/filter/source/graphicfilter/idxf/dxfentrd.cxx
+++ b/filter/source/graphicfilter/idxf/dxfentrd.cxx
@@ -47,8 +47,8 @@ void DXFBasicEntity::EvaluateGroup(DXFGroupReader & rDGR)
 {
     switch (rDGR.GetG())
     {
-        case   8: m_sLayer = OString(rDGR.GetS()); break;
-        case   6: m_sLineType = OString(rDGR.GetS()); break;
+        case   8: m_sLayer = rDGR.GetS(); break;
+        case   6: m_sLineType = rDGR.GetS(); break;
         case  38: fElevation=rDGR.GetF(); break;
         case  39: fThickness=rDGR.GetF(); break;
         case  62: nColor=rDGR.GetI(); break;
@@ -210,11 +210,11 @@ void DXFTextEntity::EvaluateGroup(DXFGroupReader & rDGR)
         case 20: aP0.fy=rDGR.GetF(); break;
         case 30: aP0.fz=rDGR.GetF(); break;
         case 40: fHeight=rDGR.GetF(); break;
-        case  1: m_sText = OString(rDGR.GetS()); break;
+        case  1: m_sText = rDGR.GetS(); break;
         case 50: fRotAngle=rDGR.GetF(); break;
         case 41: fXScale=rDGR.GetF(); break;
         case 42: fOblAngle=rDGR.GetF(); break;
-        case  7: m_sStyle = OString(rDGR.GetS()); break;
+        case  7: m_sStyle = rDGR.GetS(); break;
         case 71: nGenFlags=rDGR.GetI(); break;
         case 72: nHorzJust=rDGR.GetI(); break;
         case 73: nVertJust=rDGR.GetI(); break;
@@ -242,7 +242,7 @@ void DXFShapeEntity::EvaluateGroup(DXFGroupReader & rDGR)
         case 20: aP0.fy=rDGR.GetF(); break;
         case 30: aP0.fz=rDGR.GetF(); break;
         case 40: fSize=rDGR.GetF(); break;
-        case  2: m_sName = OString(rDGR.GetS()); break;
+        case  2: m_sName = rDGR.GetS(); break;
         case 50: fRotAngle=rDGR.GetF(); break;
         case 41: fXScale=rDGR.GetF(); break;
         case 51: fOblAngle=rDGR.GetF(); break;
@@ -269,7 +269,7 @@ void DXFInsertEntity::EvaluateGroup(DXFGroupReader & rDGR)
 {
     switch (rDGR.GetG()) {
         case 66: nAttrFlag=rDGR.GetI(); break;
-        case  2: m_sName = OString(rDGR.GetS()); break;
+        case  2: m_sName = rDGR.GetS(); break;
         case 10: aP0.fx=rDGR.GetF(); break;
         case 20: aP0.fy=rDGR.GetF(); break;
         case 30: aP0.fz=rDGR.GetF(); break;
@@ -309,15 +309,15 @@ void DXFAttDefEntity::EvaluateGroup(DXFGroupReader & rDGR)
         case 20: aP0.fy=rDGR.GetF(); break;
         case 30: aP0.fz=rDGR.GetF(); break;
         case 40: fHeight=rDGR.GetF(); break;
-        case  1: m_sDefVal = OString(rDGR.GetS()); break;
-        case  3: m_sPrompt = OString(rDGR.GetS()); break;
-        case  2: m_sTagStr = OString(rDGR.GetS()); break;
+        case  1: m_sDefVal = rDGR.GetS(); break;
+        case  3: m_sPrompt = rDGR.GetS(); break;
+        case  2: m_sTagStr = rDGR.GetS(); break;
         case 70: nAttrFlags=rDGR.GetI(); break;
         case 73: nFieldLen=rDGR.GetI(); break;
         case 50: fRotAngle=rDGR.GetF(); break;
         case 41: fXScale=rDGR.GetF(); break;
         case 51: fOblAngle=rDGR.GetF(); break;
-        case  7: m_sStyle = OString(rDGR.GetS()); break;
+        case  7: m_sStyle = rDGR.GetS(); break;
         case 71: nGenFlags=rDGR.GetI(); break;
         case 72: nHorzJust=rDGR.GetI(); break;
         case 74: nVertJust=rDGR.GetI(); break;
@@ -352,14 +352,14 @@ void DXFAttribEntity::EvaluateGroup(DXFGroupReader & rDGR)
         case 20: aP0.fy=rDGR.GetF(); break;
         case 30: aP0.fz=rDGR.GetF(); break;
         case 40: fHeight=rDGR.GetF(); break;
-        case  1: m_sText = OString(rDGR.GetS()); break;
-        case  2: m_sTagStr = OString(rDGR.GetS()); break;
+        case  1: m_sText = rDGR.GetS(); break;
+        case  2: m_sTagStr = rDGR.GetS(); break;
         case 70: nAttrFlags=rDGR.GetI(); break;
         case 73: nFieldLen=rDGR.GetI(); break;
         case 50: fRotAngle=rDGR.GetF(); break;
         case 41: fXScale=rDGR.GetF(); break;
         case 51: fOblAngle=rDGR.GetF(); break;
-        case  7: m_sStyle = OString(rDGR.GetS()); break;
+        case  7: m_sStyle = rDGR.GetS(); break;
         case 71: nGenFlags=rDGR.GetI(); break;
         case 72: nHorzJust=rDGR.GetI(); break;
         case 74: nVertJust=rDGR.GetI(); break;
@@ -791,7 +791,7 @@ DXFDimensionEntity::DXFDimensionEntity() : DXFBasicEntity(DXF_DIMENSION)
 void DXFDimensionEntity::EvaluateGroup(DXFGroupReader & rDGR)
 {
     switch (rDGR.GetG()) {
-        case  2: m_sPseudoBlock = OString(rDGR.GetS()); break;
+        case  2: m_sPseudoBlock = rDGR.GetS(); break;
         default: DXFBasicEntity::EvaluateGroup(rDGR);
     }
 }
@@ -807,29 +807,29 @@ void DXFEntities::Read(DXFGroupReader & rDGR)
 
     while (rDGR.GetG()!=0) rDGR.Read();
 
-    while (strcmp(rDGR.GetS(),"ENDBLK")!=0 &&
-           strcmp(rDGR.GetS(),"ENDSEC")!=0 &&
-           strcmp(rDGR.GetS(),"EOF")!=0 )
+    while (rDGR.GetS()!="ENDBLK" &&
+           rDGR.GetS()!="ENDSEC" &&
+           rDGR.GetS()!="EOF" )
     {
 
-        if      (strcmp(rDGR.GetS(),"LINE"      )==0) pE=new DXFLineEntity;
-        else if (strcmp(rDGR.GetS(),"POINT"     )==0) pE=new DXFPointEntity;
-        else if (strcmp(rDGR.GetS(),"CIRCLE"    )==0) pE=new DXFCircleEntity;
-        else if (strcmp(rDGR.GetS(),"ARC"       )==0) pE=new DXFArcEntity;
-        else if (strcmp(rDGR.GetS(),"TRACE"     )==0) pE=new DXFTraceEntity;
-        else if (strcmp(rDGR.GetS(),"SOLID"     )==0) pE=new DXFSolidEntity;
-        else if (strcmp(rDGR.GetS(),"TEXT"      )==0) pE=new DXFTextEntity;
-        else if (strcmp(rDGR.GetS(),"SHAPE"     )==0) pE=new DXFShapeEntity;
-        else if (strcmp(rDGR.GetS(),"INSERT"    )==0) pE=new DXFInsertEntity;
-        else if (strcmp(rDGR.GetS(),"ATTDEF"    )==0) pE=new DXFAttDefEntity;
-        else if (strcmp(rDGR.GetS(),"ATTRIB"    )==0) pE=new DXFAttribEntity;
-        else if (strcmp(rDGR.GetS(),"POLYLINE"  )==0) pE=new DXFPolyLineEntity;
-        else if (strcmp(rDGR.GetS(),"LWPOLYLINE")==0) pE=new DXFLWPolyLineEntity;
-        else if (strcmp(rDGR.GetS(),"VERTEX"    )==0) pE=new DXFVertexEntity;
-        else if (strcmp(rDGR.GetS(),"SEQEND"    )==0) pE=new DXFSeqEndEntity;
-        else if (strcmp(rDGR.GetS(),"3DFACE"    )==0) pE=new DXF3DFaceEntity;
-        else if (strcmp(rDGR.GetS(),"DIMENSION" )==0) pE=new DXFDimensionEntity;
-        else if (strcmp(rDGR.GetS(),"HATCH"     )==0) pE=new DXFHatchEntity;
+        if      (rDGR.GetS() == "LINE"      ) pE=new DXFLineEntity;
+        else if (rDGR.GetS() == "POINT"     ) pE=new DXFPointEntity;
+        else if (rDGR.GetS() == "CIRCLE"    ) pE=new DXFCircleEntity;
+        else if (rDGR.GetS() == "ARC"       ) pE=new DXFArcEntity;
+        else if (rDGR.GetS() == "TRACE"     ) pE=new DXFTraceEntity;
+        else if (rDGR.GetS() == "SOLID"     ) pE=new DXFSolidEntity;
+        else if (rDGR.GetS() == "TEXT"      ) pE=new DXFTextEntity;
+        else if (rDGR.GetS() == "SHAPE"     ) pE=new DXFShapeEntity;
+        else if (rDGR.GetS() == "INSERT"    ) pE=new DXFInsertEntity;
+        else if (rDGR.GetS() == "ATTDEF"    ) pE=new DXFAttDefEntity;
+        else if (rDGR.GetS() == "ATTRIB"    ) pE=new DXFAttribEntity;
+        else if (rDGR.GetS() == "POLYLINE"  ) pE=new DXFPolyLineEntity;
+        else if (rDGR.GetS() == "LWPOLYLINE") pE=new DXFLWPolyLineEntity;
+        else if (rDGR.GetS() == "VERTEX"    ) pE=new DXFVertexEntity;
+        else if (rDGR.GetS() == "SEQEND"    ) pE=new DXFSeqEndEntity;
+        else if (rDGR.GetS() == "3DFACE"    ) pE=new DXF3DFaceEntity;
+        else if (rDGR.GetS() == "DIMENSION" ) pE=new DXFDimensionEntity;
+        else if (rDGR.GetS() == "HATCH"     ) pE=new DXFHatchEntity;
         else
         {
             do {
diff --git a/filter/source/graphicfilter/idxf/dxfgrprd.cxx b/filter/source/graphicfilter/idxf/dxfgrprd.cxx
index ecba39f4d2fa..7ab0b8792a64 100644
--- a/filter/source/graphicfilter/idxf/dxfgrprd.cxx
+++ b/filter/source/graphicfilter/idxf/dxfgrprd.cxx
@@ -17,15 +17,12 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-
 #include <string.h>
 #include <stdlib.h>
 #include <rtl/strbuf.hxx>
 #include <tools/stream.hxx>
 #include "dxfgrprd.hxx"
 
-
-
 // we use an own ReadLine function, because Stream::ReadLine stops if
 // a 0-sign occurs; this function converts 0-signs to blanks and reads
 // a complete line until a cr/lf is found
@@ -87,42 +84,42 @@ OString DXFReadLine(SvStream& rIStm)
     return aBuf.makeStringAndClear();
 }
 
-
-
-DXFGroupReader::DXFGroupReader(SvStream & rIStream, sal_uInt16 nminpercent, sal_uInt16 nmaxpercent ) :
-    rIS(rIStream)
+void DXFSkipLine(SvStream& rIStm)
 {
-    sal_uInt16 i;
-
-    nIBuffPos=0;
-    nIBuffSize=0;
-    bStatus=true;
-    nLastG=0;
-    nGCount=0;
-
-    nMinPercent=(sal_uLong)nminpercent;
-    nMaxPercent=(sal_uLong)nmaxpercent;
-    nLastPercent=nMinPercent;
+    while (!rIStm.GetError())   // !!! do not check for EOF
+                                // !!! because we read blockwise
+    {
+        char  buf[256 + 1];
+        sal_uInt16 nLen = (sal_uInt16)rIStm.Read(buf, sizeof(buf) - 1);
+        for (sal_uInt16 n = 0; n < nLen; n++)
+        {
+            char c = buf[n];
+            if ((c == '\n') || (c == '\r'))
+            {
+                rIStm.SeekRel(n-nLen+1); // return stream to next to current position
+                char c1 = 0;
+                rIStm.Read(&c1, 1);
+                if (c1 == c || (c1 != '\n' && c1!= '\r'))
+                    rIStm.SeekRel(-1);
+                return;
+            }
+        }
+    }
+}
 
+DXFGroupReader::DXFGroupReader(SvStream & rIStream)
+  : rIS(rIStream)
+  , bStatus(true)
+  , nLastG(0)
+  , nGCount(0)
+  , S()
+  , I(0)
+{
     rIS.Seek(STREAM_SEEK_TO_END);
     nFileSize=rIS.Tell();
     rIS.Seek(0);
-
-    for (i=0; i<10; i++) S0_9[i][0]=0;
-    S100[ 0 ] = S102[ 0 ] = 0;
-    for (i=0; i<50; i++) F10_59[i]=0.0;
-    for (i=0; i<20; i++) I60_79[i]=0;
-    for (i=0; i<10; i++) I90_99[i]=0;
-    for (i=0; i< 8; i++) F140_147[i]=0.0;
-    for (i=0; i< 6; i++) I170_175[i]=0;
-    for (i=0; i<30; i++) F210_239[i]=0.0;
-    for (i=0; i<11; i++) S999_1009[i][0]=0;
-    for (i=0; i<50; i++) F1010_1059[i]=0.0;
-    for (i=0; i<20; i++) I1060_1079[i]=0;
-
 }
 
-
 sal_uInt16 DXFGroupReader::Read()
 {
     sal_uInt16 nG = 0;
@@ -132,40 +129,36 @@ sal_uInt16 DXFGroupReader::Read()
         nG = (sal_uInt16)ReadI();
         if ( bStatus )
         {
-            char aTmp[ DXF_MAX_STRING_LEN + 1 ];
-
-            if      (nG<  10) ReadS(S0_9[nG]);
-            else if (nG<  60) F10_59[nG-10]=ReadF();
-            else if (nG<  80) I60_79[nG-60]=ReadI();
-            else if (nG<  90) ReadS( aTmp );
-            else if (nG<  99) I90_99[nG-90]=ReadI();
-            else if (nG==100) ReadS(S100);
-            else if (nG==102) ReadS(S102);
-            else if (nG==105) ReadS( aTmp );
-            else if (nG< 140) ReadS( aTmp );
-            else if (nG< 148) F140_147[nG-140]=ReadF();
-            else if (nG< 170) ReadS( aTmp );
-            else if (nG< 176) I170_175[nG-175]=ReadI();
-            else if (nG< 180) ReadI();
-            else if (nG< 210) ReadS( aTmp );
-            else if (nG< 240) F210_239[nG-210]=ReadF();
-            else if (nG<=369) ReadS( aTmp );
-            else if (nG< 999) ReadS( aTmp );
-            else if (nG<1010) ReadS(S999_1009[nG-999]);
-            else if (nG<1060) F1010_1059[nG-1010]=ReadF();
-            else if (nG<1080) I1060_1079[nG-1060]=ReadI();
+            if      (nG<  10) ReadS();
+            else if (nG<  60) F = ReadF();
+            else if (nG<  80) I = ReadI();
+            else if (nG<  90) DXFSkipLine(rIS);
+            else if (nG<  99) I = ReadI();
+            else if (nG==100) ReadS();
+            else if (nG==102) ReadS();
+            else if (nG==105) DXFSkipLine(rIS);
+            else if (nG< 140) DXFSkipLine(rIS);
+            else if (nG< 148) F = ReadF();
+            else if (nG< 170) DXFSkipLine(rIS);
+            else if (nG< 176) I = ReadI();
+            else if (nG< 180) DXFSkipLine(rIS); // ReadI();
+            else if (nG< 210) DXFSkipLine(rIS);
+            else if (nG< 240) F = ReadF();
+            else if (nG<=369) DXFSkipLine(rIS);
+            else if (nG< 999) DXFSkipLine(rIS);
+            else if (nG<1010) ReadS();
+            else if (nG<1060) F = ReadF();
+            else if (nG<1072) I = ReadI();
             else bStatus = false;
         }
     }
-    if ( bStatus )
-        nLastG = nG;
-    else
+    if ( !bStatus )
     {
         nG = 0;
         SetS();
         if ( nGCount != 0xffffffff )
         {
-            // InfoBox(NULL,String("Fehler ab Gruppe Nr ")+String(nGCount)).Execute();
+            // InfoBox(NULL,String("Error in group # ")+String(nGCount)).Execute();
             nGCount=0xffffffff;
         }
     }
@@ -173,124 +166,37 @@ sal_uInt16 DXFGroupReader::Read()
     return nG;
 }
 
-
-long DXFGroupReader::GetI(sal_uInt16 nG) const
-{
-    sal_Int32 nRetValue = 0;
-    if ( ( nG >= 60 ) && ( nG <= 79 ) )
-        nRetValue = I60_79[ nG - 60 ];
-    else if ( ( nG >= 90 ) && ( nG <= 99 ) )
-        nRetValue = I90_99[ nG - 90 ];
-    else if ( ( nG >= 170 ) && ( nG <= 175 ) )
-        nRetValue = I170_175[ nG - 170 ];
-    else if ( ( nG >= 1060 ) && ( nG <= 1079 ) )
-        nRetValue = I1060_1079[ nG - 1060 ];
-    return nRetValue;
-}
-
-double DXFGroupReader::GetF(sal_uInt16 nG) const
-{
-    nG-=10;
-    if (nG<50) return F10_59[nG];
-    else {
-        nG-=130;
-        if (nG<8) return F140_147[nG];
-        else {
-            nG-=70;
-            if (nG<30) return F210_239[nG];
-            else {
-                nG-=800;
-                if (nG<50) return F1010_1059[nG];
-                else return 0;
-            }
-        }
-    }
-}
-
-const char * DXFGroupReader::GetS(sal_uInt16 nG) const
-{
-    if (nG<10) return S0_9[nG];
-    else if ( nG == 100 )
-        return S100;
-    else if ( nG == 102 )
-        return S102;
-    else
-    {
-        nG-=999;
-        if (nG<11) return S999_1009[nG];
-        else return NULL;
-    }
-}
-
-void DXFGroupReader::SetF(sal_uInt16 nG, double fF)
-{
-    nG-=10;
-    if (nG<50) F10_59[nG]=fF;
-    else {
-        nG-=130;
-        if (nG<8) F140_147[nG]=fF;
-        else {
-            nG-=70;
-            if (nG<30) F210_239[nG]=fF;
-            else {
-                nG-=800;
-                if (nG<50) F1010_1059[nG]=fF;
-            }
-        }
-    }
-}
-
-
 void DXFGroupReader::SetS()
 {
-    strncpy(S0_9[0], "EOF", DXF_MAX_STRING_LEN);
-    S0_9[0][DXF_MAX_STRING_LEN] = 0;
-}
-
-
-void DXFGroupReader::ReadLine(char * ptgt)
-{
-    OString aStr = DXFReadLine(rIS);
-
-    size_t nLen = aStr.getLength();
-    if ( nLen > DXF_MAX_STRING_LEN )
-        nLen = DXF_MAX_STRING_LEN;
-
-    memcpy( ptgt, aStr.getStr(), nLen );
-    ptgt[ nLen ] = 0x00;
+    S = "EOF";
 }
 
-
 long DXFGroupReader::ReadI()
 {
-    char sl[DXF_MAX_STRING_LEN+1],*p;
-    long res,nv;
-
-    ReadLine(sl);
-
-    p=sl;
+    OString s = DXFReadLine(rIS);
+    char *p=s.pData->buffer;
+    const char *end = s.pData->buffer + s.pData->length;
 
-    while(*p==0x20) p++;
+    while((p != end) && (*p==0x20)) p++;
 
-    if ((*p<'0' || *p>'9') && *p!='-') {
+    if ((p == end) || ((*p<'0' || *p>'9') && *p!='-')) {
         bStatus=false;
         return 0;
     }
 
-    if (*p=='-') {
+    long res = 0, nv = 1;
+    if (*p == '-') {
         nv=-1;
         p++;
     }
-    else nv=1;
 
-    res=0;
-    do {
-        res=res*10+(long)(*p-'0');
+    while ((p != end) && *p >= '0' && *p <= '9') {
+        res=res*10+static_cast<long>(*p-'0');
         p++;
-    } while (*p>='0' && *p<='9');
+    }
 
-    while (*p==0x20) p++;
-    if (*p!=0) {
+    while ((p != end) && (*p==0x20)) p++;
+    if (p != end) {
         bStatus=false;
         return 0;
     }
@@ -298,25 +204,23 @@ long DXFGroupReader::ReadI()
     return res*nv;
 }
 
-
 double DXFGroupReader::ReadF()
 {
-    char sl[DXF_MAX_STRING_LEN+1],*p;
+    OString s = DXFReadLine(rIS);
+    char *p = s.pData->buffer;
+    const char *end = s.pData->buffer + s.pData->length;
 
-    ReadLine(sl);
-    p=sl;
-    while(*p==0x20) p++;
-    if ((*p<'0' || *p>'9') && *p!='.' && *p!='-') {
+    while((p != end) && (*p==0x20)) p++;
+    if ((p == end) || ((*p<'0' || *p>'9') && *p!='.' && *p!='-')) {
         bStatus=false;
         return 0.0;
     }
     return atof(p);
 }
 
-
-void DXFGroupReader::ReadS(char * ptgt)
+void DXFGroupReader::ReadS()
 {
-    ReadLine(ptgt);
+    S = DXFReadLine(rIS);
 }
 
 
diff --git a/filter/source/graphicfilter/idxf/dxfgrprd.hxx b/filter/source/graphicfilter/idxf/dxfgrprd.hxx
index d1fb88060d10..e8429b53bd73 100644
--- a/filter/source/graphicfilter/idxf/dxfgrprd.hxx
+++ b/filter/source/graphicfilter/idxf/dxfgrprd.hxx
@@ -24,18 +24,13 @@
 
 #include <tools/stream.hxx>
 
-#define DXF_MAX_STRING_LEN 256 // Max Stringlaenge (ohne die 0)
-
 
 class DXFGroupReader
 {
 
 public:
 
-    // note:
-    // sizeof(DXFGroupReader) is big, so only create dynamically
-
-    DXFGroupReader( SvStream & rIStream, sal_uInt16 nMinPercent, sal_uInt16 nMaxPercent );
+    DXFGroupReader( SvStream & rIStream );
 
     bool GetStatus() const;
 
@@ -45,6 +40,7 @@ public:
         // Reads next group and returns the group code.
         // In case of an error GetStatus() returns sal_False, group code will be set
         // to 0 and SetS(0,"EOF") will be executed.
+    bool Read(sal_uInt16 nExpectedG) { return Read() == nExpectedG; }
 
     sal_uInt16 GetG() const;
         // Return the last group code (the one the last Read() did return).
@@ -59,57 +55,34 @@ public:
         // This read must have returned a group code for datatype Floatingpoint.
         // If not 0 is returend
 
-    const char * GetS() const;
+    const OString& GetS() const;
         // Returns the string of the group which was read earlier with Read().
         // This read must have returned a group code for datatype String.
         // If not NULL is returend
 
-    // The following three methods work like the above execp that a different than the
-    // current group code can bet set. (DXFGroupReader stroes the parameters of all
-    // group codes. Therefore it is possible to first Read() some groups and then analyze
-    // them afterwards.)
-
-    long         GetI(sal_uInt16 nG) const;
-    double       GetF(sal_uInt16 nG) const;
-    const char * GetS(sal_uInt16 nG) const;
-
     // The following methods can change the current values of group codes
     // (e.g. to set default values, before 'blindly' reading lots of groups)
 
-    void SetF(sal_uInt16 nG, double fF);
     void SetS(); // (will be copied)
 
 private:
 
-    void   ReadLine(char * ptgt);
     long   ReadI();
     double ReadF();
-    void   ReadS(char * ptgt);
+    void   ReadS();
 
     SvStream & rIS;
-    sal_uInt16 nIBuffSize,nIBuffPos;
     bool bStatus;
     sal_uInt16 nLastG;
     sal_uLong nGCount;
 
-    sal_uLong nMinPercent;
-    sal_uLong nMaxPercent;
-    sal_uLong nLastPercent;
     sal_uLong nFileSize;
 
-    char   S0_9      [10][DXF_MAX_STRING_LEN+1]; // Strings  group codes  0..9
-    double F10_59    [50];      // Floats   group codes 10..59
-    long   I60_79    [20];      // Integers group codes 60..79
-    long   I90_99    [10];
-    char   S100      [DXF_MAX_STRING_LEN+1];
-    char   S102      [DXF_MAX_STRING_LEN+1];
-    double F140_147  [ 8];      // Floats   group codes 140..147
-    long   I170_175  [ 6];      // Integers group codes 170..175
-    double F210_239  [30];      // Floats   group codes 210..239
-    char   S999_1009 [11][DXF_MAX_STRING_LEN+1]; // Strings  group codes 999..1009
-    double F1010_1059[50];      // Floats   group codes 1010..1059
-    long   I1060_1079[20];      // Integers group codes 1060..1079
-
+    OString S;
+    union {
+        double F;
+        long I;
+    };
 };
 
 
@@ -131,17 +104,17 @@ inline sal_uInt16 DXFGroupReader::GetG() const
 
 inline long DXFGroupReader::GetI() const
 {
-    return GetI(nLastG);
+    return I;
 }
 
 inline double DXFGroupReader::GetF() const
 {
-    return GetF(nLastG);
+    return F;
 }
 
-inline const char * DXFGroupReader::GetS() const
+inline const OString& DXFGroupReader::GetS() const
 {
-    return GetS(nLastG);
+    return S;
 }
 
 #endif
diff --git a/filter/source/graphicfilter/idxf/dxfreprd.cxx b/filter/source/graphicfilter/idxf/dxfreprd.cxx
index d715714427b3..c276e58e8766 100644
--- a/filter/source/graphicfilter/idxf/dxfreprd.cxx
+++ b/filter/source/graphicfilter/idxf/dxfreprd.cxx
@@ -20,7 +20,7 @@
 
 #include <string.h>
 #include <dxfreprd.hxx>
-#include <boost/scoped_ptr.hpp>
+#include "osl/nlsupport.h"
 
 //------------------DXFBoundingBox--------------------------------------------
 
@@ -128,9 +128,10 @@ void DXFPalette::SetColor(sal_uInt8 nIndex, sal_uInt8 nRed, sal_uInt8 nGreen, sa
 
 
 DXFRepresentation::DXFRepresentation()
+    : bUseUTF8(false)
 {
-    setTextEncoding(RTL_TEXTENCODING_IBM_437);
-        setGlobalLineTypeScale(1.0);
+    setTextEncoding(osl_getTextEncodingFromLocale(nullptr)); // Use default encoding if none specified
+    setGlobalLineTypeScale(1.0);
 }
 
 
@@ -139,7 +140,7 @@ DXFRepresentation::~DXFRepresentation()
 }
 
 
-bool DXFRepresentation::Read( SvStream & rIStream, sal_uInt16 nMinPercent, sal_uInt16 nMaxPercent)
+bool DXFRepresentation::Read( SvStream & rIStream, sal_uInt16 /*nMinPercent*/, sal_uInt16 /*nMaxPercent*/)
 {
     bool bRes;
 
@@ -147,27 +148,25 @@ bool DXFRepresentation::Read( SvStream & rIStream, sal_uInt16 nMinPercent, sal_u
     aBlocks.Clear();
     aEntities.Clear();
 
-    boost::scoped_ptr<DXFGroupReader> pDGR(new DXFGroupReader( rIStream, nMinPercent, nMaxPercent ));
+    DXFGroupReader DGR( rIStream );
 
-    pDGR->Read();
-    while (pDGR->GetG()!=0 || strcmp(pDGR->GetS(),"EOF")!=0) {
-        if (pDGR->GetG()==0 && strcmp(pDGR->GetS(),"SECTION")==0) {
-            if (pDGR->Read()!=2) {
-                pDGR->SetError();
+    DGR.Read();
+    while (DGR.GetG()!=0 || (DGR.GetS() != "EOF")) {
+        if (DGR.GetG()==0 && DGR.GetS() == "SECTION") {
+            if (DGR.Read()!=2) {
+                DGR.SetError();
                 break;
             }
-            if      (strcmp(pDGR->GetS(),"HEADER"  )==0) ReadHeader(*pDGR);
-            else if (strcmp(pDGR->GetS(),"TABLES"  )==0) aTables.Read(*pDGR);
-            else if (strcmp(pDGR->GetS(),"BLOCKS"  )==0) aBlocks.Read(*pDGR);
-            else if (strcmp(pDGR->GetS(),"ENTITIES")==0) aEntities.Read(*pDGR);
-            else pDGR->Read();
+            if      (DGR.GetS() == "HEADER")   ReadHeader(DGR);
+            else if (DGR.GetS() == "TABLES")   aTables.Read(DGR);
+            else if (DGR.GetS() == "BLOCKS")   aBlocks.Read(DGR);
+            else if (DGR.GetS() == "ENTITIES") aEntities.Read(DGR);
+            else DGR.Read();
         }
-        else pDGR->Read();
+        else DGR.Read();
     }
 
-    bRes=pDGR->GetStatus();
-
-    pDGR.reset();
+    bRes=DGR.GetStatus();
 
     if (bRes && aBoundingBox.bEmpty)
         CalcBoundingBox(aEntities,aBoundingBox);
@@ -175,55 +174,72 @@ bool DXFRepresentation::Read( SvStream & rIStream, sal_uInt16 nMinPercent, sal_u
     return bRes;
 }
 
-
 void DXFRepresentation::ReadHeader(DXFGroupReader & rDGR)
 {
-
-         while (rDGR.GetG()!=0 || (strcmp(rDGR.GetS(),"EOF")!=0 &&  strcmp(rDGR.GetS(),"ENDSEC")!=0) )
-         {
-                 if (rDGR.GetG()==9) {
-                         if (strcmp(rDGR.GetS(),"$EXTMIN")==0 ||
-                                 strcmp(rDGR.GetS(),"$EXTMAX")==0)
-                         {
-                                 DXFVector aVector;
-                                 rDGR.SetF(10,0.0);
-                                 rDGR.SetF(20,0.0);
-                                 rDGR.SetF(30,0.0);
-                                 do {
-                                         rDGR.Read();
-                                 } while (rDGR.GetG()!=9 && rDGR.GetG()!=0);
-                                 aVector.fx=rDGR.GetF(10);
-                                 aVector.fy=rDGR.GetF(20);
-                                 aVector.fz=rDGR.GetF(30);
-                                 aBoundingBox.Union(aVector);
-                         } else {
-                                 if (strcmp(rDGR.GetS(),"$DWGCODEPAGE")==0)
-                                 {
-                                         rDGR.Read();
-
-                                         // FIXME: we really need a whole table of
-                                         // $DWGCODEPAGE to encodings mappings
-                                         if ( (strcmp(rDGR.GetS(),"ANSI_932")==0) ||
-                          (strcmp(rDGR.GetS(),"ansi_932")==0) ||
-                                              (strcmp(rDGR.GetS(),"DOS932")==0) ||
-                                              (strcmp(rDGR.GetS(),"dos932")==0) )
-                                         {
-                                                 setTextEncoding(RTL_TEXTENCODING_MS_932);
-                                         }
-                                 }
-                 else if (strcmp(rDGR.GetS(),"$LTSCALE")==0)
-                                 {
-                                         rDGR.Read();
-                                         setGlobalLineTypeScale(getGlobalLineTypeScale() * rDGR.GetF());
-                                 }
-                                 else rDGR.Read();
-                         }
-                 }
-                 else rDGR.Read();
-         }
+    while (rDGR.GetG()!=0 || (rDGR.GetS() != "EOF" && rDGR.GetS() != "ENDSEC") )
+    {
+        if (rDGR.GetG()==9) {
+            if (rDGR.GetS() == "$EXTMIN" ||
+                rDGR.GetS() == "$EXTMAX")
+            {
+                DXFVector aVector;
+                while (rDGR.Read()!=9 && rDGR.GetG()!=0) {
+                    switch (rDGR.GetG()) {
+                    case 10: aVector.fx = rDGR.GetF(); break;
+                    case 20: aVector.fy = rDGR.GetF(); break;
+                    case 30: aVector.fz = rDGR.GetF(); break;
+                    }
+                }
+                aBoundingBox.Union(aVector);
+            }
+            else if (rDGR.GetS() == "$ACADVER")
+            {
+                if (!rDGR.Read(1))
+                    continue;
+                if (rDGR.GetS() >= "AC1021")
+                    bUseUTF8 = true;
+            }
+            else if (rDGR.GetS() == "$DWGCODEPAGE")
+            {
+                if (!rDGR.Read(3))
+                    continue;
+
+                // FIXME: we really need a whole table of
+                // $DWGCODEPAGE to encodings mappings
+                if ( (rDGR.GetS().equalsIgnoreAsciiCase("ANSI_932")) ||
+                     (rDGR.GetS().equalsIgnoreAsciiCase("DOS932")) )
+                {
+                    setTextEncoding(RTL_TEXTENCODING_MS_932);
+                }
+                else if (rDGR.GetS().equalsIgnoreAsciiCase("ANSI_936"))
+                {
+                    setTextEncoding(RTL_TEXTENCODING_MS_936);
+                }
+                else if (rDGR.GetS().equalsIgnoreAsciiCase("ANSI_949"))
+                {
+                    setTextEncoding(RTL_TEXTENCODING_MS_949);
+                }
+                else if (rDGR.GetS().equalsIgnoreAsciiCase("ANSI_950"))
+                {
+                    setTextEncoding(RTL_TEXTENCODING_MS_950);
+                }
+                else if (rDGR.GetS().equalsIgnoreAsciiCase("ANSI_1251"))
+                {
+                    setTextEncoding(RTL_TEXTENCODING_MS_1251);
+                }
+            }
+            else if (rDGR.GetS() == "$LTSCALE")
+            {
+                if (!rDGR.Read(40))
+                    continue;
+                setGlobalLineTypeScale(getGlobalLineTypeScale() * rDGR.GetF());
+            }
+            else rDGR.Read();
+        }
+        else rDGR.Read();
+    }
 }
 
-
 void DXFRepresentation::CalcBoundingBox(const DXFEntities & rEntities,
                                         DXFBoundingBox & rBox)
 {
@@ -373,4 +389,57 @@ void DXFRepresentation::CalcBoundingBox(const DXFEntities & rEntities,
     }
 }
 
+namespace {
+    inline bool lcl_isDec(sal_Unicode ch)
+    {
+        return ch >= L'0' && ch <= L'9';
+    }
+    inline bool lcl_isHex(sal_Unicode ch)
+    {
+        return lcl_isDec(ch) || (ch >= L'A' && ch <= L'F') || (ch >= L'a' && ch <= L'f');
+    }
+}
+
+OUString DXFRepresentation::ToOUString(const OString& s, bool bSpecials) const
+{
+    OUString result = OStringToOUString(s, getTextEncoding());
+    if (bSpecials) {
+        result = result.replaceAll("%%o", "")                     // Overscore - simply remove
+                       .replaceAll("%%u", "")                     // Underscore - simply remove
+                       .replaceAll("%%d", OUString(sal_Unicode(L'\u00B0'))) // Degrees symbol (°)
+                       .replaceAll("%%p", OUString(sal_Unicode(L'\u00B1'))) // Tolerance symbol (±)
+                       .replaceAll("%%c", OUString(sal_Unicode(L'\u2205'))) // Diameter symbol
+                       .replaceAll("%%%", "%");                   // Percent symbol
+
+        sal_Int32 pos = result.indexOf("%%"); // %%nnn, where nnn - 3-digit decimal ASCII code
+        while (pos != -1 && pos <= result.getLength() - 5) {
+            OUString asciiNum = result.copy(pos + 2, 3);
+            if (lcl_isDec(asciiNum[0]) &&
+                lcl_isDec(asciiNum[1]) &&
+                lcl_isDec(asciiNum[2]))
+            {
+                char ch = static_cast<char>(asciiNum.toUInt32());
+                OUString codePt(&ch, 1, mEnc);
+                result = result.replaceAll(result.copy(pos, 5), codePt, pos);
+            }
+            pos = result.indexOf("%%", pos + 1);
+        }
+
+        pos = result.indexOf("\\U+"); // \U+XXXX, where XXXX - 4-digit hex unicode
+        while (pos != -1 && pos <= result.getLength() - 7) {
+            OUString codePtNum = result.copy(pos + 3, 4);
+            if (lcl_isHex(codePtNum[0]) &&
+                lcl_isHex(codePtNum[1]) &&
+                lcl_isHex(codePtNum[2]) &&
+                lcl_isHex(codePtNum[3]))
+            {
+                OUString codePt(static_cast<sal_Unicode>(codePtNum.toUInt32(16)));
+                result = result.replaceAll(result.copy(pos, 7), codePt, pos);
+            }
+            pos = result.indexOf("\\U+", pos + 1);
+        }
+    }
+    return result;
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/filter/source/graphicfilter/idxf/dxfreprd.hxx b/filter/source/graphicfilter/idxf/dxfreprd.hxx
index 6a43ddd8af7c..a2e6d7aabb48 100644
--- a/filter/source/graphicfilter/idxf/dxfreprd.hxx
+++ b/filter/source/graphicfilter/idxf/dxfreprd.hxx
@@ -92,16 +92,19 @@ public:
 
     rtl_TextEncoding mEnc;  // $DWGCODEPAGE
 
+    bool bUseUTF8; // for AC1021 and higher
+
     double mfGlobalLineTypeScale; // $LTSCALE
 
     DXFRepresentation();
     ~DXFRepresentation();
 
-        rtl_TextEncoding getTextEncoding() const;
-        void setTextEncoding(rtl_TextEncoding aEnc);
+    rtl_TextEncoding getTextEncoding() const;
+    void setTextEncoding(rtl_TextEncoding aEnc);
+    OUString ToOUString(const OString& s, bool bSpecials=false) const;
 
-        double getGlobalLineTypeScale() const;
-        void setGlobalLineTypeScale(double fGlobalLineTypeScale);
+    double getGlobalLineTypeScale() const;
+    void setGlobalLineTypeScale(double fGlobalLineTypeScale);
 
     bool Read( SvStream & rIStream, sal_uInt16 nMinPercent, sal_uInt16 nMaxPercent);
         // Reads complete DXF file.
@@ -120,7 +123,7 @@ private:
 inline sal_uInt8 DXFPalette::GetRed(sal_uInt8 nIndex) const { return pRed[nIndex]; }
 inline sal_uInt8 DXFPalette::GetGreen(sal_uInt8 nIndex) const { return pGreen[nIndex]; }
 inline sal_uInt8 DXFPalette::GetBlue(sal_uInt8 nIndex) const { return pBlue[nIndex]; }
-inline rtl_TextEncoding DXFRepresentation::getTextEncoding() const { return mEnc; }
+inline rtl_TextEncoding DXFRepresentation::getTextEncoding() const { return bUseUTF8 ? RTL_TEXTENCODING_UTF8 : mEnc; }
 inline void DXFRepresentation::setTextEncoding(rtl_TextEncoding aEnc) { mEnc = aEnc; }
 inline double DXFRepresentation::getGlobalLineTypeScale() const { return mfGlobalLineTypeScale; }
 inline void DXFRepresentation::setGlobalLineTypeScale(double fGlobalLineTypeScale) { mfGlobalLineTypeScale = fGlobalLineTypeScale; }
diff --git a/filter/source/graphicfilter/idxf/dxftblrd.cxx b/filter/source/graphicfilter/idxf/dxftblrd.cxx
index be1d6c062c34..26d96dd3a653 100644
--- a/filter/source/graphicfilter/idxf/dxftblrd.cxx
+++ b/filter/source/graphicfilter/idxf/dxftblrd.cxx
@@ -40,10 +40,10 @@ void DXFLType::Read(DXFGroupReader & rDGR)
         switch (rDGR.GetG())
         {
         case  2:
-            m_sName = OString(rDGR.GetS());
+            m_sName = rDGR.GetS();
             break;
         case  3:
-            m_sDescription = OString(rDGR.GetS());
+            m_sDescription = rDGR.GetS();
             break;
         case 70:
             nFlags=rDGR.GetI();
@@ -93,10 +93,10 @@ void DXFLayer::Read(DXFGroupReader & rDGR)
         switch(rDGR.GetG())
         {
         case  2:
-            m_sName = OString(rDGR.GetS());
+            m_sName = rDGR.GetS();
             break;
         case  6:
-            m_sLineType = OString(rDGR.GetS());
+            m_sLineType = rDGR.GetS();
             break;
         case 70:
             nFlags=rDGR.GetI();
@@ -128,13 +128,13 @@ void DXFStyle::Read(DXFGroupReader & rDGR)
         switch(rDGR.GetG())
         {
         case  2:
-            m_sName = OString(rDGR.GetS());
+            m_sName = rDGR.GetS();
             break;
         case  3:
-            m_sPrimFontFile = OString(rDGR.GetS());
+            m_sPrimFontFile = rDGR.GetS();
             break;
         case  4:
-            m_sBigFontFile = OString(rDGR.GetS());
+            m_sBigFontFile = rDGR.GetS();
             break;
         case 70:
             nFlags=rDGR.GetI();
@@ -204,7 +204,7 @@ void DXFVPort::Read(DXFGroupReader & rDGR)
         switch(rDGR.GetG())
         {
         case  2:
-            m_sName = OString(rDGR.GetS());
+            m_sName = rDGR.GetS();
             break;
         case 10: fMinX=rDGR.GetF(); break;
         case 11: fMaxX=rDGR.GetF(); break;
@@ -284,27 +284,27 @@ void DXFTables::Read(DXFGroupReader & rDGR)
 
     for (;;) {
         while (rDGR.GetG()!=0) rDGR.Read();
-        if (strcmp(rDGR.GetS(),"EOF")==0 ||
-            strcmp(rDGR.GetS(),"ENDSEC")==0) break;
-        else if (strcmp(rDGR.GetS(),"LTYPE")==0) {
+        if (rDGR.GetS() == "EOF" ||
+            rDGR.GetS() == "ENDSEC") break;
+        else if (rDGR.GetS() == "LTYPE") {
             pLT=new DXFLType;
             pLT->Read(rDGR);
             *ppLT=pLT;
             ppLT=&(pLT->pSucc);
         }
-        else if (strcmp(rDGR.GetS(),"LAYER")==0) {
+        else if (rDGR.GetS() == "LAYER") {
             pLa=new DXFLayer;
             pLa->Read(rDGR);
             *ppLa=pLa;
             ppLa=&(pLa->pSucc);
         }
-        else if (strcmp(rDGR.GetS(),"STYLE")==0) {
+        else if (rDGR.GetS() == "STYLE") {
             pSt=new DXFStyle;
             pSt->Read(rDGR);
             *ppSt=pSt;
             ppSt=&(pSt->pSucc);
         }
-        else if (strcmp(rDGR.GetS(),"VPORT")==0) {
+        else if (rDGR.GetS() == "VPORT") {
             pVP=new DXFVPort;
             pVP->Read(rDGR);
             *ppVP=pVP;