Simplify file structure

src/mapfile.hpp

@@ -0,0 +1,85 @@
+#pragma once
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#ifdef HAVE_MMAP
+#  include <sys/types.h>
+#  include <fcntl.h>
+#  include <sys/mman.h>
+#endif
+#ifdef _WIN32
+#  include <windows.h>
+#endif
+#include <glib.h>
+
+class MapFile {
+public:
+    MapFile() {}
+    ~MapFile();
+    MapFile(const MapFile&) = delete;
+    MapFile& operator=(const MapFile&) = delete;
+    bool open(const char *file_name, unsigned long file_size);
+    gchar *begin() { return data; }
+private:
+    char *data = nullptr;
+    unsigned long size = 0ul;
+#ifdef HAVE_MMAP
+    int mmap_fd = -1;
+#elif defined(_WIN32)
+    HANDLE hFile = 0;
+    HANDLE hFileMap = 0;
+#endif
+};
+
+inline bool MapFile::open(const char *file_name, unsigned long file_size)
+{
+  size=file_size;
+#ifdef HAVE_MMAP
+  if ((mmap_fd = ::open(file_name, O_RDONLY)) < 0) {
+    //g_print("Open file %s failed!\n",fullfilename);
+    return false;
+  }
+  data = (gchar *)mmap( nullptr, file_size, PROT_READ, MAP_SHARED, mmap_fd, 0);
+  if ((void *)data == (void *)(-1)) {
+    //g_print("mmap file %s failed!\n",idxfilename);
+    data=nullptr;
+    return false;
+  }
+#elif defined( _WIN32)
+  hFile = CreateFile(file_name, GENERIC_READ, 0, nullptr, OPEN_ALWAYS, 
+		     FILE_ATTRIBUTE_NORMAL, 0);
+  hFileMap = CreateFileMapping(hFile, nullptr, PAGE_READONLY, 0,  
+			       file_size, nullptr);
+  data = (gchar *)MapViewOfFile(hFileMap, FILE_MAP_READ, 0, 0, file_size);
+#else
+  gsize read_len;
+  if (!g_file_get_contents(file_name, &data, &read_len, nullptr))
+    return false;
+
+  if (read_len != file_size)
+    return false;		
+#endif
+
+  return true;
+}
+
+inline MapFile::~MapFile()
+{
+  if (!data)
+    return;
+#ifdef HAVE_MMAP
+  munmap(data, size);
+  close(mmap_fd);
+#else
+#  ifdef _WIN32
+  UnmapViewOfFile(data);
+  CloseHandle(hFileMap);
+  CloseHandle(hFile);
+#  else
+		g_free(data);
+#  endif
+#endif			
+}
+