geb.report.PngUtils Maven / Gradle / Ivy

/* Copyright 2009 the original author or authors.
 *
 * 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 geb.report;

import java.io.DataInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;

class PngUtils {
	
	static public boolean isPng(byte[] bytes) {
		try {
			return new DataInputStream(new ByteArrayInputStream(bytes)).readLong() == 0x89504e470d0a1a0aL;
		} catch (IOException e) {
			// not going to happen
			return false;
		}
		
	}
	
}