tools svg2tvg: ++Windows port

Complete the Windows port build that is currently missing.

@Issue: https://github.com/thorvg/thorvg/issues/882

src/bin/svg2tvg/svg2tvg.cpp

@@ -23,20 +23,45 @@
 #include <iostream>
 #include <vector>
 #include <thorvg.h>
-#include <dirent.h>
+#ifdef _WIN32
+    #include <windows.h>
+    #ifndef PATH_MAX
+        #define PATH_MAX MAX_PATH
+    #endif
+#else
+    #include <dirent.h>
+    #include <unistd.h>
+    #include <limits.h>
+    #include <sys/stat.h>
+#endif
 
 using namespace std;
 using namespace tvg;
 
 
-void helpMsg()
+struct App
 {
-    cout<<"Usage: \n   svg2tvg [SVG file] or [SVG folder]\n\nExamples: \n    $ svg2tvg input.svg\n    $ svg2tvg svgfolder\n\n";
-}
+private:
+   char full[PATH_MAX];    //full path
 
+   void helpMsg()
+   {
+      cout << "Usage: \n   svg2tvg [SVG file] or [SVG folder]\n\nExamples: \n    $ svg2tvg input.svg\n    $ svg2tvg svgfolder\n\n";
+   }
 
-bool convert(string& in, string& out)
-{
+   bool validate(string& svgName)
+   {
+      string extn = ".svg";
+
+      if (svgName.size() <= extn.size() || svgName.substr(svgName.size() - extn.size()) != extn) {
+         cout << "Error: \"" << svgName << "\" is invalid." << endl;
+         return false;
+      }
+      return true;
+   }
+
+   bool convert(string& in, string& out)
+   {
       if (Initializer::init(CanvasEngine::Sw, 0) != Result::Success) return false;
 
       auto picture = Picture::gen();
@@ -49,87 +74,108 @@ bool convert(string& in, string& out)
       if (Initializer::term(CanvasEngine::Sw) != Result::Success) return false;
 
       return true;
-}
+   }
 
-
-void convert(string& svgName)
-{
+   void convert(string& svgName)
+   {
       //Get tvg file
       auto tvgName = svgName;
       tvgName.replace(tvgName.length() - 3, 3, "tvg");
 
       if (convert(svgName, tvgName)) {
-        cout<<"Generated TVG file : "<< tvgName << endl;
-    } else {
-        cout<<"Failed Converting TVG file : "<< svgName << endl;
+         cout << "Generated TVG file : " << tvgName << endl;
+      }
+      else {
+         cout << "Failed Converting TVG file : " << svgName << endl;
+      }
    }
-}
 
-
-char* getpath(const char* input)
-{
-    static char buf[PATH_MAX];
+   const char* realPath(const char* path)
+   {
 #ifdef _WIN32
-    return _fullpath(buf, input, PATH_MAX);
+      return _fullpath(full, path, PATH_MAX);
 #else
-    return realpath(input, buf);
+      return realpath(path, full);
 #endif
-}
+   }
 
+   bool isDirectory(const char* path)
+   {
+#ifdef _WIN32
+      DWORD attr = GetFileAttributes(path);
+      if (attr == INVALID_FILE_ATTRIBUTES) return false;
+      return attr & FILE_ATTRIBUTE_DIRECTORY;
+#else
+      struct stat buf;
+      if (stat(path, &buf) != 0) return false;
+      return S_ISDIR(buf.st_mode);
+#endif
+   }
 
-bool validate(string& svgName)
-{
-    string extn = ".svg";
-
-    if (svgName.size() <= extn.size() || svgName.substr(svgName.size() - extn.size()) != extn) {
-        cout << "Error: \"" << svgName << "\" is invalid." << endl;
+   bool handleDirectory(const string& path)
+   {
+#ifdef _WIN32
+        //open directory
+        WIN32_FIND_DATA fd;
+        HANDLE h = FindFirstFileEx((path + "\\*").c_str(), FindExInfoBasic, &fd, FindExSearchNameMatch, NULL, 0);
+        if (h == INVALID_HANDLE_VALUE) {
+            cout << "Couldn't open directory \"" << path.c_str() << "\"." << endl;
             return false;
         }
-    return true;
-}
+        //List directories
+        do {
+            if (*fd.cFileName == '.' || *fd.cFileName == '$') continue;
+            //sub directory
+            if (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+                string subpath = string(path);
+                subpath += '\\';
+                subpath += fd.cFileName;
+                if (!handleDirectory(subpath)) continue;
+            //file
+            } else {
+                string svgName(fd.cFileName);
+                if (!validate(svgName)) continue;
+                svgName = string(path);
+                svgName += '\\';
+                svgName += fd.cFileName;
+                convert(svgName);
+            }
+        } while (FindNextFile(h, &fd));
 
-
-void directory(const string& path, DIR* dir)
-{
+        FindClose(h);
+#else
+        //open directory
+        auto dir = opendir(path.c_str());
+        if (!dir) {
+            cout << "Couldn't open directory \"" << path.c_str() << "\"." << endl;
+            return false;
+        }
         //List directories
         while (auto entry = readdir(dir)) {
             if (*entry->d_name == '.' || *entry->d_name == '$') continue;
+            //sub directory
             if (entry->d_type == DT_DIR) {
                 string subpath = string(path);
-#ifdef _WIN32
-            subpath += '\\';
-#else
                 subpath += '/';
-#endif
                 subpath += entry->d_name;
-
-            //open directory
-            if (auto subdir = opendir(subpath.c_str())) {
-                cout << "Sub Directory: \"" << subpath << "\"" << endl;
-                directory(subpath, subdir);
-                closedir(dir);
-            }
-
+                if (!handleDirectory(subpath)) continue;
+            //file
             } else {
                 string svgName(entry->d_name);
                 if (!validate(svgName)) continue;
                 svgName = string(path);
-#ifdef _WIN32
-            svgName += '\\';
-#else
                 svgName += '/';
-#endif
                 svgName += entry->d_name;
-
                 convert(svgName);
             }
         }
-}
+#endif
+        return true;
+    }
 
-
-
-int main(int argc, char **argv)
-{
+public:
+   int setup(int argc, char** argv)
+   {
       //Collect input files
       vector<const char*> inputs;
 
@@ -145,23 +191,30 @@ int main(int argc, char **argv)
 
       for (auto input : inputs) {
 
-        auto path = getpath(input);
+         auto path = realPath(input);
          if (!path) {
             cout << "Invalid file or path name: \"" << input << "\"" << endl;
             continue;
          }
 
-        if (auto dir = opendir(path)) {
+         if (isDirectory(path)) {
             //load from directory
             cout << "Directory: \"" << path << "\"" << endl;
-            directory(path, dir);
-            closedir(dir);
-        } else {
+            if (!handleDirectory(path)) break;
+         }
+         else {
             string svgName(input);
             if (!validate(svgName)) continue;
             convert(svgName);
          }
       }
-
       return 0;
+   }
+};
+
+
+int main(int argc, char **argv)
+{
+   App app;
+   return app.setup(argc, argv);
 }