package com.jcoglan.websocket;

import java.lang.Long; import java.io.IOException;

import org.jruby.Ruby; import org.jruby.RubyClass; import org.jruby.RubyModule; import org.jruby.RubyObject; import org.jruby.RubyString; import org.jruby.anno.JRubyMethod; import org.jruby.runtime.ObjectAllocator; import org.jruby.runtime.ThreadContext; import org.jruby.runtime.builtin.IRubyObject; import org.jruby.runtime.load.BasicLibraryService;

public class WebsocketMaskService implements BasicLibraryService {

private Ruby runtime;

public boolean basicLoad(Ruby runtime) throws IOException {
  this.runtime = runtime;
  RubyModule websocket = runtime.defineModule("WebSocket");

  RubyClass webSocketMask = websocket.defineClassUnder("Mask", runtime.getObject(), new ObjectAllocator() {
    public IRubyObject allocate(Ruby runtime, RubyClass rubyClass) {
      return new WebsocketMask(runtime, rubyClass);
    }
  });

  webSocketMask.defineAnnotatedMethods(WebsocketMask.class);
  return true;
}

public class WebsocketMask extends RubyObject {
  public WebsocketMask(final Ruby runtime, RubyClass rubyClass) {
    super(runtime, rubyClass);
  }

  @JRubyMethod
  public IRubyObject mask(ThreadContext context, IRubyObject payload, IRubyObject mask) {
    if (mask.isNil()) return payload;

    byte[] payload_a = ((RubyString)payload).getBytes();
    byte[] mask_a    = ((RubyString)mask).getBytes();
    int i, n         = payload_a.length;

    if (n == 0) return payload;

    for (i = 0; i < n; i++) {
      payload_a[i] ^= mask_a[i % 4];
    }
    return RubyString.newStringNoCopy(runtime, payload_a);
  }
}

}