Moved some classes around.

src/main/java/net/rubygrapefruit/platform/internal/DefaultPosixFile.java

@@ -0,0 +1,29 @@
+package net.rubygrapefruit.platform.internal;
+
+import net.rubygrapefruit.platform.NativeException;
+import net.rubygrapefruit.platform.PosixFile;
+import net.rubygrapefruit.platform.internal.jni.PosixFileFunctions;
+
+import java.io.File;
+
+public class DefaultPosixFile implements PosixFile {
+    @Override
+    public void setMode(File file, int perms) {
+        FunctionResult result = new FunctionResult();
+        PosixFileFunctions.chmod(file.getPath(), perms, result);
+        if (result.isFailed()) {
+            throw new NativeException(String.format("Could not set UNIX mode on %s: %s", file, result.getMessage()));
+        }
+    }
+
+    @Override
+    public int getMode(File file) {
+        FunctionResult result = new FunctionResult();
+        FileStat stat = new FileStat();
+        PosixFileFunctions.stat(file.getPath(), stat, result);
+        if (result.isFailed()) {
+            throw new NativeException(String.format("Could not get UNIX mode on %s: %s", file, result.getMessage()));
+        }
+        return stat.mode;
+    }
+}