com.google.gwt.dev.shell.ie.LowLevelIE6 Maven / Gradle / Ivy
/*
* Copyright 2006 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.shell.ie;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.util.tools.Utility;
import java.io.File;
import java.io.IOException;
/**
* Various low-level helper methods for dealing with COM and such.
*/
class LowLevelIE6 {
private static boolean sInitialized = false;
/**
* Does an HTTP GET that works with Windows proxy settings. Set the system
* property gwt.debugLowLevelHttpGet to print failure status
* codes to stderr.
*
* @param userAgent the user-agent to specify for the GET
* @param url the absolute URL to GET
* @return the bytes of the full response (including headers), or
* null if there's a problem
*/
public static byte[] httpGet(TreeLogger branch, String userAgent, String url,
boolean debugFlag) {
if (!init()) {
return null;
}
byte[][] out = new byte[1][];
int status = _httpGet(userAgent, url, out);
if (status == 0) {
return out[0];
} else {
if (debugFlag) {
branch.log(TreeLogger.ERROR, "GET failed with status " + status
+ " for " + url);
}
return null;
}
}
public static synchronized boolean init() {
if (!sInitialized) {
File lib = new File(Utility.getInstallPath(), "gwt-ll.dll");
if (!lib.exists()) {
return false;
}
try {
// Try to make canonical.
System.load(lib.getCanonicalPath());
} catch (IOException e) {
return false;
} catch (UnsatisfiedLinkError e) {
return false;
}
sInitialized = true;
}
return true;
}
// CHECKSTYLE_OFF
// out must be an array of size 1 to receive the array answer
private static native int _httpGet(String userAgent, String url, byte[][] out);
// CHECKSTYLE_ON
/**
* Not instantiable.
*/
private LowLevelIE6() {
}
}