add File.canRead()/File.canWrite() implementation

classpath/java-io.cpp

@@ -377,6 +377,31 @@ Java_java_io_File_delete(JNIEnv* e, jclass, jstring path)
   }
 }
 
+extern "C" JNIEXPORT jboolean JNICALL
+Java_java_io_File_canRead(JNIEnv* e, jclass, jstring path)
+{
+  string_t chars = getChars(e, path);
+  if (chars) {
+    int r = access(chars, R_OK);
+    releaseChars(e, path, chars);
+    return (r == 0);
+  }
+  return false;
+}
+
+extern "C" JNIEXPORT jboolean JNICALL
+Java_java_io_File_canWrite(JNIEnv* e, jclass, jstring path)
+{
+  string_t chars = getChars(e, path);
+  if (chars) {
+    int r = access(chars, W_OK);
+    releaseChars(e, path, chars);
+    return (r == 0);
+  }
+  return false;
+}
+
+
 extern "C" JNIEXPORT jboolean JNICALL
 Java_java_io_File_rename(JNIEnv* e, jclass, jstring old, jstring new_)
 {

classpath/java/io/File.java

@@ -60,7 +60,19 @@ public class File {
   public boolean isFile() {
     return isFile(path);
   }
+  
+  private static native boolean canRead(String path);
+  
+  public boolean canRead() {
+    return canRead(path);
+  }
 
+  private static native boolean canWrite(String path);
+  
+  public boolean canWrite() {
+    return canWrite(path);
+  }
+  
   public String getName() {
     int index = path.lastIndexOf(FileSeparator);
     if (index >= 0) {

test/FileOutput.java

@@ -1,3 +1,4 @@
+import java.io.File;
 import java.io.FileOutputStream;
 import java.io.FileInputStream;
 import java.io.File;