com.liferay.portal.kernel.flash.FlashMagicBytesUtil Maven / Gradle / Ivy
/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.portal.kernel.flash;
import com.liferay.portal.kernel.util.ArrayUtil;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
/**
* @author Brian Wing Shun Chan
* @author Mika Koivisto
*/
public class FlashMagicBytesUtil {
public static Result check(InputStream inputStream) throws IOException {
PushbackInputStream pushbackInputStream = new PushbackInputStream(
inputStream, 3);
byte[] magicBytes = new byte[3];
int length = pushbackInputStream.read(magicBytes);
if (length < 0) {
return new Result(false, inputStream);
}
pushbackInputStream.unread(magicBytes, 0, length);
inputStream = pushbackInputStream;
if (ArrayUtil.containsAll(_FLASH_MAGIC_BYTES[0], magicBytes) ||
ArrayUtil.containsAll(_FLASH_MAGIC_BYTES[1], magicBytes) ||
ArrayUtil.containsAll(_FLASH_MAGIC_BYTES[2], magicBytes)) {
return new Result(true, inputStream);
}
return new Result(false, inputStream);
}
public static class Result {
public InputStream getInputStream() {
return _inputStream;
}
public boolean isFlash() {
return _flash;
}
private Result(boolean flash, InputStream inputStream) {
_flash = flash;
_inputStream = inputStream;
}
private final boolean _flash;
private final InputStream _inputStream;
}
private static final byte[][] _FLASH_MAGIC_BYTES = {
{0x46, 0x57, 0x53}, {0x43, 0x57, 0x53}, {0x5a, 0x57, 0x53}
};
}