/*
* Copyright 2013 cruxframework.org.
*
* 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 org.cruxframework.crux.core.client.utils;
import org.cruxframework.crux.core.client.encoder.Base64;
import org.cruxframework.crux.core.client.file.Blob;
import com.google.gwt.typedarrays.client.ArrayBufferNative;
import com.google.gwt.typedarrays.client.Uint8ArrayNative;
import com.google.gwt.typedarrays.shared.ArrayBuffer;
import com.google.gwt.typedarrays.shared.Uint8Array;
/**
* @author Thiago da Rosa de Bustamante
*
*/
public class FileUtils
{
/**
* Get the file extension based in the filename
* @param fileName
* @return
*/
public static String getFileExtension(String fileName)
{
String extension = "";
if(fileName == null || fileName == "")
{
return extension;
}
int i = fileName.lastIndexOf('.');
int p = Math.max(fileName.lastIndexOf('/'), fileName.lastIndexOf('\\'));
if (i > p)
{
extension = fileName.substring(i+1);
}
return extension;
}
/**
* Create a new Blob from the dataURI string
* @param dataURI
* @return
*/
public static Blob fromDataURI(String dataURI)
{
String[] strings = dataURI.split(",");
String byteString = getByteString(strings[1], strings[0]);
String mimeString = strings[0].split(":")[1].split(";")[0];
int length = byteString.length();
ArrayBuffer ab = ArrayBufferNative.create(length);
Uint8Array ia = Uint8ArrayNative.create(ab);
for (int i = 0; i < length; i++)
{
ia.set(i, StringUtils.charCodeAt(byteString, i));
}
return Blob.createIfSupported(ab, mimeString);
}
/*
* Create a new File from the dataURI string
* @param dataURI
* @param fileName
* @return
* TODO check status of https://bugzilla.mozilla.org/show_bug.cgi?id=819900
*/
// public static File fromDataURI(String dataURI, String fileName)
// {
// return File.createIfSupported(fromDataURI(dataURI), fileName);
// }
/**
* convert base64/URLEncoded data component to raw binary data held in a string
* @param str
* @return
*/
private static String getByteString(String str, String mimeDecl)
{
String byteString;
if (mimeDecl.indexOf("base64") >= 0)
{
byteString = Base64.decode(str);
}
else
{
byteString = JsUtils.unescape(str);
}
return byteString;
};
}