Prepare wpiutil for merge into allwpilib.

wpiutil/src/main/java/edu/wpi/first/wpiutil/RuntimeDetector.java

@@ -0,0 +1,112 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2017-2018 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+package edu.wpi.first.wpiutil;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+
+public class RuntimeDetector {
+  private static String filePrefix;
+  private static String fileExtension;
+  private static String filePath;
+
+  private static synchronized void computePlatform() {
+    if (fileExtension != null && filePath != null && filePrefix != null) {
+      return;
+    }
+
+
+    boolean intel32 = is32BitIntel();
+    boolean intel64 = is64BitIntel();
+
+    if (isWindows()) {
+      filePrefix = "";
+      fileExtension = ".dll";
+      if (intel32) {
+        filePath = "/windows/x86/";
+      } else {
+        filePath = "/windows/x86-64/";
+      }
+    } else if (isMac()) {
+      filePrefix = "lib";
+      fileExtension = ".dylib";
+      if (intel32) {
+        filePath = "/osx/x86";
+      } else {
+        filePath = "/osx/x86-64/";
+      }
+    } else if (isLinux()) {
+      filePrefix = "lib";
+      fileExtension = ".so";
+      if (intel32) {
+        filePath = "/linux/x86/";
+      } else if (intel64) {
+        filePath = "/linux/x86-64/";
+      } else if (isAthena()) {
+        filePath = "/linux/athena/";
+      } else {
+        filePath = "/linux/nativearm/";
+      }
+    } else {
+      throw new RuntimeException("Failed to determine OS");
+    }
+  }
+
+  public static synchronized String getFilePrefix() {
+    computePlatform();
+
+    return filePrefix;
+  }
+
+  public static synchronized String getFileExtension() {
+    computePlatform();
+
+    return fileExtension;
+  }
+
+  public static synchronized String getPlatformPath() {
+    computePlatform();
+
+    return filePath;
+  }
+
+  public static synchronized String getLibraryResource(String libName) {
+    computePlatform();
+
+    return filePath + filePrefix + libName + fileExtension;
+  }
+
+  public static boolean isAthena() {
+    File runRobotFile = new File("/usr/local/frc/bin/frcRunRobot.sh");
+    return runRobotFile.exists();
+  }
+
+  public static boolean isLinux() {
+    return System.getProperty("os.name").startsWith("Linux");
+  }
+
+  public static boolean isWindows() {
+    return System.getProperty("os.name").startsWith("Windows");
+  }
+
+  public static boolean isMac() {
+    return System.getProperty("os.name").startsWith("Mac");
+  }
+
+  public static boolean is32BitIntel() {
+    String arch = System.getProperty("os.arch");
+    return arch.equals("x86") || arch.equals("i386");
+  }
+
+  public static boolean is64BitIntel() {
+    String arch = System.getProperty("os.arch");
+    return arch.equals("amd64") || arch.equals("x86_64");
+  }
+}