Rename Steam's DLLs and copy CreamAPI's DLLs to target path

.gitignore

@@ -155,6 +155,7 @@ $RECYCLE.BIN/
 
 # End of https://www.gitignore.io/api/java,maven,windows,intellij
 
-cream_api.ini
-steamapps.json
+/cream_api.ini
+/steamapps.json
 /test.json
+/steam_api.md5

src/main/java/Controller.java

@@ -4,6 +4,7 @@ import javafx.collections.FXCollections;
 import javafx.fxml.FXML;
 import javafx.scene.control.Tooltip;
 import javafx.stage.FileChooser;
+import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.commons.configuration2.ex.ConfigurationException;
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
@@ -13,12 +14,19 @@ import pojo.App;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 public class Controller {
+    private static final String X86_MD5_HASH = "c6f267a2d10b891ed352ed849a28d69b";
+    private static final String X64_MD5_HASH = "645c728a6117946294130d07cf6c0cae";
     private CreamApiConfig config = CreamApiConfig.getInstance();
     private SteamAppsListCache cache = new SteamAppsListCache();
     @FXML
@@ -47,6 +55,7 @@ public class Controller {
     public JFXButton path_button;
     @FXML
     public JFXButton retrieveDlcList_button;
+    private String steamApiPathString;
 
     public Controller() {
     }
@@ -105,6 +114,11 @@ public class Controller {
     }
 
     public void save() {
+        try {
+            setUpCreamApi();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
         config.setDlcListFromString(dlc_textarea.getText());
         config.setAppId(Integer.parseInt(appId_textfield.getText()));
         config.setExtraProtection(extra_protection_checkbox.isSelected());
@@ -196,8 +210,41 @@ public class Controller {
         try {
             config.setConfig(file.getParent() + "\\cream_api.ini");
             path_textfield.setText(file.getParent());
+            steamApiPathString = file.getAbsolutePath();
         } catch (ConfigurationException | IOException e) {
             e.printStackTrace();
         }
     }
+
+    /**
+     * check if creamapi version of dll is there, if not, rename original to steam_api(64)_o.dll and copy
+     * creamapi one to the path.
+     *
+     * @throws IOException If file is missing or not accessible/modifiable.
+     */
+    private void setUpCreamApi() throws IOException {
+        boolean is64Bit = false;
+        if (!steamApiPathString.isEmpty()) {
+            Path path = Paths.get(steamApiPathString);
+            if (path.endsWith("steam_api64.dll")) {
+                is64Bit = true;
+            }
+            InputStream is = Files.newInputStream(path);
+            String md5 = DigestUtils.md5Hex(is);
+            boolean isSameFile = Objects.equals(md5, is64Bit ? X64_MD5_HASH : X86_MD5_HASH);
+            if (!isSameFile) {
+                String pathOrigString = steamApiPathString;
+                pathOrigString =
+                        pathOrigString
+                                .replaceFirst("(?<steamApiDll>steam_api(?:64)?.dll)$",
+                                        is64Bit ? "steam_api64_o.dll" : "steam_api_o.dll");
+                Path pathOrig = Paths.get(pathOrigString);
+                if (!Files.exists(pathOrig)) {
+                    Files.move(path, pathOrig);
+                }
+                Files.deleteIfExists(path);
+                Files.copy(Paths.get(is64Bit ? "steam_api64.dll" : "steam_api.dll"), path);
+            }
+        }
+    }
 }

src/main/java/CreamApiConfig.java

@@ -148,9 +148,7 @@ public class CreamApiConfig {
 
     public void setConfig(String path) throws ConfigurationException, IOException {
         File file = new File(path);
-        if (!file.exists()) {
-            final boolean newFile = file.createNewFile();
-        }
+        boolean fileCreated = file.createNewFile();
         this.config = CONFIGS.ini(path);
         this.config.setCommentLeadingCharsUsedInInput(";");
         this.path = path;