Continued rework of networking, added root check

Main/src/main/java/com/chameleonvision/util/MathHandler.java

@@ -0,0 +1,20 @@
+package com.chameleonvision.util;
+
+import java.lang.Math;
+
+public class MathHandler {
+    MathHandler() {}
+
+    public static double sigmoid(double x){
+        double bias = 0;
+        double a = 5;
+        double b = -0.05;
+        double k = 200;
+
+        if (x < 50){
+            bias = -1.338;
+        }
+
+        return ((k / (1 + Math.pow(Math.E,(a + (b * x))))) + bias);
+    }
+}

Main/src/main/java/com/chameleonvision/util/ShellExec.java

@@ -0,0 +1,141 @@
+package com.chameleonvision.util;
+
+import java.io.*;
+
+/**
+ * Execute external process and optionally read output buffer.
+ */
+public class ShellExec {
+    private int exitCode;
+    private boolean readOutput, readError;
+    private StreamGobbler errorGobbler, outputGobbler;
+
+    public ShellExec() {
+        this(false, false);
+    }
+
+    public ShellExec(boolean readOutput, boolean readError) {
+        this.readOutput = readOutput;
+        this.readError = readError;
+    }
+
+    /**
+     * Execute a command.
+     * @param command   command ("c:/some/folder/script.bat" or "some/folder/script.sh")
+     * @param workdir   working directory or NULL to use command folder
+     * @param wait  wait for process to end
+     * @param args  0..n command line arguments
+     * @return  process exit code
+     */
+    public int execute(String command, String workdir, boolean wait, String...args) throws IOException {
+        String[] cmdArr;
+        if (args != null && args.length > 0) {
+            cmdArr = new String[1+args.length];
+            cmdArr[0] = command;
+            System.arraycopy(args, 0, cmdArr, 1, args.length);
+        } else {
+            cmdArr = new String[] { command };
+        }
+
+        ProcessBuilder pb =  new ProcessBuilder(cmdArr);
+        File workingDir = (workdir==null ? new File(command).getParentFile() : new File(workdir) );
+        pb.directory(workingDir);
+
+        Process process = pb.start();
+
+        // Consume streams, older jvm's had a memory leak if streams were not read,
+        // some other jvm+OS combinations may block unless streams are consumed.
+        errorGobbler  = new StreamGobbler(process.getErrorStream(), readError);
+        outputGobbler = new StreamGobbler(process.getInputStream(), readOutput);
+        errorGobbler.start();
+        outputGobbler.start();
+
+        exitCode = 0;
+        if (wait) {
+            try {
+                process.waitFor();
+                exitCode = process.exitValue();
+            } catch (InterruptedException ignored) { }
+        }
+        return exitCode;
+    }
+
+    public int getExitCode() {
+        return exitCode;
+    }
+
+    public boolean isOutputCompleted() {
+        return (outputGobbler != null && outputGobbler.isCompleted());
+    }
+
+    public boolean isErrorCompleted() {
+        return (errorGobbler != null && errorGobbler.isCompleted());
+    }
+
+    public String getOutput() {
+        return (outputGobbler != null ? outputGobbler.getOutput() : null);
+    }
+
+    public String getError() {
+        return (errorGobbler != null ? errorGobbler.getOutput() : null);
+    }
+
+//********************************************
+//********************************************
+
+    /**
+     * StreamGobbler reads inputstream to "gobble" it.
+     * This is used by Executor class when running
+     * a commandline applications. Gobblers must read/purge
+     * INSTR and ERRSTR process streams.
+     * http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?page=4
+     */
+    @SuppressWarnings("WeakerAccess")
+    private class StreamGobbler extends Thread {
+        private InputStream is;
+        private StringBuilder output;
+        private volatile boolean completed; // mark volatile to guarantee a thread safety
+
+        public StreamGobbler(InputStream is, boolean readStream) {
+            this.is = is;
+            this.output = (readStream ? new StringBuilder(256) : null);
+        }
+
+        public void run() {
+            completed = false;
+            try {
+                String NL = System.getProperty("line.separator", "\r\n");
+
+                InputStreamReader isr = new InputStreamReader(is);
+                BufferedReader br = new BufferedReader(isr);
+                String line;
+                while ( (line = br.readLine()) != null) {
+                    if (output != null)
+                        output.append(line).append(NL);
+                }
+            } catch (IOException ex) {
+                // ex.printStackTrace();
+            }
+            completed = true;
+        }
+
+        /**
+         * Get inputstream buffer or null if stream
+         * was not consumed.
+         * @return
+         */
+        public String getOutput() {
+            return (output != null ? output.toString() : null);
+        }
+
+        /**
+         * Is input stream completed.
+         * @return
+         */
+        public boolean isCompleted() {
+            return completed;
+        }
+
+    }
+
+}