ENH: surfMesh support for reading compressed binary stl files (issue #294)

- increases coverage.

STYLE: relocate some core pieces into fileFormats

src/fileFormats/stl/STLReader.C

@@ -0,0 +1,188 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
+     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "STLReader.H"
+#include "Map.H"
+#include "IFstream.H"
+
+#undef DEBUG_STLBINARY
+
+// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
+
+bool Foam::fileFormats::STLReader::readBINARY
+(
+    const fileName& filename
+)
+{
+    sorted_ = true;
+
+    label nTris = 0;
+    autoPtr<istream> streamPtr = readBinaryHeader(filename, nTris);
+
+    if (!streamPtr.valid())
+    {
+        FatalErrorInFunction
+            << "Error reading file " << filename
+            << " or file " << filename + ".gz"
+            << exit(FatalError);
+    }
+
+    istream& is = streamPtr();
+
+#ifdef DEBUG_STLBINARY
+    Info<< "# " << nTris << " facets" << endl;
+    label prevZone = -1;
+#endif
+
+    points_.setSize(3*nTris);
+    zoneIds_.setSize(nTris);
+
+    Map<label> lookup;
+    DynamicList<label> dynSizes;
+
+    label ptI = 0;
+    label zoneI = -1;
+    forAll(zoneIds_, facei)
+    {
+        // Read STL triangle
+        STLtriangle stlTri(is);
+
+        // transcribe the vertices of the STL triangle -> points
+        points_[ptI++] = stlTri.a();
+        points_[ptI++] = stlTri.b();
+        points_[ptI++] = stlTri.c();
+
+        // interpret STL attribute as a zone
+        const label origId = stlTri.attrib();
+
+        Map<label>::const_iterator fnd = lookup.find(origId);
+        if (fnd != lookup.end())
+        {
+            if (zoneI != fnd())
+            {
+                // group appeared out of order
+                sorted_ = false;
+            }
+            zoneI = fnd();
+        }
+        else
+        {
+            zoneI = dynSizes.size();
+            lookup.insert(origId, zoneI);
+            dynSizes.append(0);
+        }
+
+        zoneIds_[facei] = zoneI;
+        dynSizes[zoneI]++;
+
+#ifdef DEBUG_STLBINARY
+        if (prevZone != zoneI)
+        {
+            if (prevZone != -1)
+            {
+                Info<< "endsolid zone" << prevZone << nl;
+            }
+            prevZone = zoneI;
+
+            Info<< "solid zone" << prevZone << nl;
+        }
+
+        stlTri.print(Info);
+#endif
+    }
+
+#ifdef DEBUG_STLBINARY
+    if (prevZone != -1)
+    {
+        Info<< "endsolid zone" << prevZone << nl;
+    }
+#endif
+
+    names_.clear();
+    sizes_.transfer(dynSizes);
+
+    return true;
+}
+
+
+bool Foam::fileFormats::STLReader::readFile
+(
+    const fileName& filename,
+    const STLFormat& format
+)
+{
+    if (format == DETECT ? detectBinaryHeader(filename) : format == BINARY)
+    {
+        return readBINARY(filename);
+    }
+    else
+    {
+        return readASCII(filename);
+    }
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::fileFormats::STLReader::STLReader
+(
+    const fileName& filename
+)
+:
+    sorted_(true),
+    points_(),
+    zoneIds_(),
+    names_(),
+    sizes_()
+{
+    // Auto-detect ASCII/BINARY format
+    readFile(filename, STLCore::DETECT);
+}
+
+
+Foam::fileFormats::STLReader::STLReader
+(
+    const fileName& filename,
+    const STLFormat& format
+)
+:
+    sorted_(true),
+    points_(),
+    zoneIds_(),
+    names_(),
+    sizes_()
+{
+    // Manually specified ASCII/BINARY format
+    readFile(filename, format);
+}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::fileFormats::STLReader::~STLReader()
+{}
+
+
+// ************************************************************************* //