ENH: add readContiguous detail (#1378)

- allows some internal handling for reading dissimilar storage types.
  Eg, scalars written as float (WM_SP), but read as double (WM_DP)

- reading binary parcel coordinates with dissimilar storage types is
  still pending

src/OpenFOAM/containers/Bits/PackedList/PackedListIO.C

@@ -119,6 +119,8 @@ Foam::Istream& Foam::PackedList<Width>::read(Istream& is)
         }
         else
         {
+            // NOTE: binary content should be independent of WM_LABEL_SIZE
+
             if (len)
             {
                 is.read

src/OpenFOAM/containers/Lists/FixedList/FixedListIO.C

@@ -223,7 +223,12 @@ Foam::Istream& Foam::operator>>(Foam::Istream& is, FixedList<T, N>& list)
     {
         // Binary and contiguous
 
-        is.read(reinterpret_cast<char*>(list.data()), N*sizeof(T));
+        Detail::readContiguous<T>
+        (
+            is,
+            reinterpret_cast<char*>(list.data()),
+            N*sizeof(T)
+        );
 
         is.fatalCheck
         (

src/OpenFOAM/containers/Lists/List/ListIO.C

@@ -126,7 +126,12 @@ Foam::Istream& Foam::operator>>(Istream& is, List<T>& list)
         {
             // Non-empty, binary, contiguous
 
-            is.read(reinterpret_cast<char*>(list.data()), len*sizeof(T));
+            Detail::readContiguous<T>
+            (
+                is,
+                reinterpret_cast<char*>(list.data()),
+                len*sizeof(T)
+            );
 
             is.fatalCheck
             (

src/OpenFOAM/containers/Lists/UList/UListIO.C

@@ -259,7 +259,12 @@ Foam::Istream& Foam::operator>>(Istream& is, UList<T>& list)
         {
             // Non-empty, binary, contiguous
 
-            is.read(reinterpret_cast<char*>(list.data()), len*sizeof(T));
+            Detail::readContiguous<T>
+            (
+                is,
+                reinterpret_cast<char*>(list.data()),
+                len*sizeof(T)
+            );
 
             is.fatalCheck
             (

src/OpenFOAM/db/IOstreams/IOstreams/Istream.H

@@ -47,6 +47,7 @@ SourceFiles
 
 #include "IOstream.H"
 #include "token.H"
+#include "contiguous.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -194,10 +195,50 @@ inline Istream& operator>>(Istream& is, IOstreamManip f)
 }
 
 
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Detail
+{
+    //- Read binary block of contiguous data, possibly with conversion
+    template<class T>
+    void readContiguous(Istream& is, char* data, std::streamsize byteCount)
+    {
+        is.beginRawRead();
+
+        if (is_contiguous_label<T>::value)
+        {
+            readRawLabel
+            (
+                is,
+                reinterpret_cast<label*>(data),
+                byteCount/sizeof(label)
+            );
+        }
+        else if (is_contiguous_scalar<T>::value)
+        {
+            readRawScalar
+            (
+                is,
+                reinterpret_cast<scalar*>(data),
+                byteCount/sizeof(scalar)
+            );
+        }
+        else
+        {
+            is.readRaw(data, byteCount);
+        }
+
+        is.endRawRead();
+    }
+
+} // End namespace Detail
+
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 } // End namespace Foam
 
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 #ifdef NoRepository

src/OpenFOAM/matrices/Matrix/MatrixIO.C

@@ -112,7 +112,12 @@ bool Foam::Matrix<Form, Type>::readMatrix(Istream& is)
         {
             if (len)
             {
-                is.read(reinterpret_cast<char*>(v_), len*sizeof(Type));
+                Detail::readContiguous<Type>
+                (
+                    is,
+                    reinterpret_cast<char*>(v_),
+                    len*sizeof(Type)
+                );
 
                 is.fatalCheck("readMatrix : reading the binary block");
             }

src/OpenFOAM/meshes/boundBox/boundBox.C

@@ -305,8 +305,9 @@ Foam::Istream& Foam::operator>>(Istream& is, boundBox& bb)
     }
     else
     {
-        is.read
+        Detail::readContiguous<boundBox>
         (
+            is,
             reinterpret_cast<char*>(&bb.min_),
             sizeof(boundBox)
         );

src/OpenFOAM/meshes/meshShapes/labelledTri/labelledTriI.H

@@ -134,7 +134,12 @@ inline Foam::Istream& Foam::operator>>(Istream& is, labelledTri& t)
     }
     else
     {
-        is.read(reinterpret_cast<char*>(&t), sizeof(labelledTri));
+        Detail::readContiguous<labelledTri>
+        (
+            is,
+            reinterpret_cast<char*>(&t),
+            sizeof(labelledTri)
+        );
     }
 
     is.check(FUNCTION_NAME);

src/dynamicMesh/polyTopoChange/polyTopoChange/refinementData.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011 OpenFOAM Foundation
@@ -61,8 +61,9 @@ Foam::Istream& Foam::operator>>(Foam::Istream& is, Foam::refinementData& wDist)
     }
     else
     {
-        is.read
+        Detail::readContiguous<refinementData>
         (
+            is,
             reinterpret_cast<char*>(&wDist.refinementCount_),
             sizeof(refinementData)
         );

src/meshTools/AABBTree/AABBTree.C

@@ -495,22 +495,21 @@ Foam::Istream& Foam::operator>>(Istream& is, AABBTree<Type>& tree)
     if (is.format() == IOstream::ASCII)
     {
         is  >> tree.maxLevel_
-            >> tree.minLeafSize_
-            >> tree.boundBoxes_
-            >> tree.addressing_;
+            >> tree.minLeafSize_;
     }
     else
     {
-        is.read
-        (
-            reinterpret_cast<char*>(&tree.maxLevel_),
-            sizeof(tree.maxLevel_)
-          + sizeof(tree.minLeafSize_)
-        );
-        is  >> tree.boundBoxes_
-            >> tree.addressing_;
+        is.beginRawRead();
+
+        readRawLabel(is, &tree.maxLevel_);
+        readRawLabel(is, &tree.minLeafSize_);
+
+        is.endRawRead();
     }
 
+    is  >> tree.boundBoxes_
+        >> tree.addressing_;
+
     is.check(FUNCTION_NAME);
     return is;
 }