reintegration of LatCore & folder restructuration

lib/Io/BinReader.hpp

@@ -0,0 +1,196 @@
+/*
+ * BinReader.hpp, part of LatAnalyze
+ *
+ * Copyright (C) 2015 Antonin Portelli
+ *
+ * LatAnalyze 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.
+ *
+ * LatAnalyze 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 LatAnalyze.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LatAnalyze_BinReader_hpp_
+#define LatAnalyze_BinReader_hpp_
+
+#include <LatAnalyze/Global.hpp>
+
+BEGIN_LATAN_NAMESPACE
+
+// I/O exception
+class BinIO: public std::runtime_error
+{
+public:
+    BinIO(std::string msg, std::string loc);
+};
+
+/******************************************************************************
+ *                        Byte manipulation utilities                         *
+ ******************************************************************************/
+class Endianness
+{
+public:
+    enum: uint32_t
+    {
+        little  = 0x00000001,
+        big     = 0x01000000,
+        unknown = 0xffffffff
+    };
+};
+
+class ByteManip
+{
+public:
+    static constexpr uint32_t getHostEndianness(void)
+    {
+        return ((0xffffffff & 1) == Endianness::little) ? Endianness::little
+            : (((0xffffffff & 1) == Endianness::big) ? Endianness::big
+               : Endianness::unknown);
+    }
+    template <typename T>
+    static T swapBytes(const T);
+};
+
+/******************************************************************************
+ *                         template implementation                            *
+ ******************************************************************************/
+template <typename T>
+T ByteManip::swapBytes(const T u)
+{
+    static_assert (CHAR_BIT == 8, "CHAR_BIT != 8");
+    
+    union
+    {
+        T             u;
+        unsigned char u8[sizeof(T)];
+    } source, dest;
+    
+    source.u = u;
+    for (size_t k = 0; k < sizeof(T); ++k)
+    {
+        dest.u8[k] = source.u8[sizeof(T) - k - 1];
+    }
+    
+    return dest.u;
+}
+
+/******************************************************************************
+ *                        Utility to read binary files                        *
+ ******************************************************************************/
+class BinReader
+{
+public:
+    // constructor
+    BinReader(void) = default;
+    BinReader(const std::string fileName,
+              const uint32_t endianness = ByteManip::getHostEndianness(),
+              const bool isColMaj = false);
+    // destructor
+    virtual ~BinReader(void) = default;
+    // I/O
+    void       open(const std::string fileName,
+                    const uint32_t endianness = ByteManip::getHostEndianness(),
+                    const bool isColMaj = false);
+    void       close(void);
+    template <typename T>
+    void       read(T *pt, Index size);
+    template <typename T>
+    T          read(void);
+    template <typename T>
+    MatBase<T> read(const Index nRow, const Index nCol);
+private:
+    std::unique_ptr<std::ifstream> file_{nullptr};
+    std::string                    fileName_;
+    size_t                         size_;
+    uint32_t                       endianness_;
+    bool                           isColMaj_;
+};
+
+/******************************************************************************
+ *                         template implementation                            *
+ ******************************************************************************/
+template <typename T>
+void BinReader::read(T *pt, Index n)
+{
+    if (file_ != nullptr)
+    {
+        file_->read(reinterpret_cast<char *>(pt),
+                    static_cast<long>(sizeof(T))*n);
+        if (endianness_ != ByteManip::getHostEndianness())
+        {
+            for (Index i = 0; i < n; ++i)
+            {
+                pt[i] = ByteManip::swapBytes(pt[i]);
+            }
+        }
+        
+    }
+    else
+    {
+        LATAN_ERROR(Io, "file is not opened");
+    }
+}
+
+template <typename T>
+T BinReader::read(void)
+{
+    T x;
+    
+    if (file_ != nullptr)
+    {
+        read(&x, 1);
+    }
+    else
+    {
+        LATAN_ERROR(Io, "file is not opened");
+    }
+    
+    return x;
+}
+
+template <>
+std::string BinReader::read(void);
+
+template <typename T>
+MatBase<T> BinReader::read(const Index nRow, const Index nCol)
+{
+    MatBase<T> m;
+    
+    // Eigen matrices use column-major ordering
+    if (isColMaj_)
+    {
+        m.resize(nRow, nCol);
+    }
+    else
+    {
+        m.resize(nCol, nRow);
+    }
+    if (file_ != nullptr)
+    {
+        read(m.data(), nRow*nCol);
+    }
+    else
+    {
+        LATAN_ERROR(Io, "file is not opened");
+    }
+    if (isColMaj_)
+    {
+        return m;
+    }
+    else
+    {
+        return m.transpose();
+
+    }
+}
+
+END_LATAN_NAMESPACE
+
+#endif // LatAnalyze_BinReader_hpp_