Util.java

package guang.crawler.crawlWorker.util;

public class Util
{
	
	public static int byteArray2Int(byte[] b)
	{
		int value = 0;
		for (int i = 0; i < 4; i++)
		{
			int shift = (4 - 1 - i) * 8;
			value += (b[i] & 0x000000FF) << shift;
		}
		return value;
	}
	
	public static long byteArray2Long(byte[] b)
	{
		int value = 0;
		for (int i = 0; i < 8; i++)
		{
			int shift = (8 - 1 - i) * 8;
			value += (b[i] & 0x000000FF) << shift;
		}
		return value;
	}
	
	public static boolean hasBinaryContent(String contentType)
	{
		if (contentType != null)
		{
			String typeStr = contentType.toLowerCase();
			if (typeStr.contains("image") || typeStr.contains("audio")
			        || typeStr.contains("video")
			        || typeStr.contains("application"))
			{
				return true;
			}
		}
		return false;
	}
	
	public static boolean hasPlainTextContent(String contentType)
	{
		if (contentType != null)
		{
			String typeStr = contentType.toLowerCase();
			if (typeStr.contains("text/plain") || typeStr.contains("text/css")
			        || typeStr.contains("text/javascript"))
			{
				return true;
			}
		}
		return false;
	}
	
	public static byte[] int2ByteArray(int value)
	{
		byte[] b = new byte[4];
		for (int i = 0; i < 4; i++)
		{
			int offset = (3 - i) * 8;
			b[i] = (byte) ((value >>> offset) & 0xFF);
		}
		return b;
	}
	
	public static byte[] long2ByteArray(long l)
	{
		byte[] array = new byte[8];
		int i, shift;
		for (i = 0, shift = 56; i < 8; i++, shift -= 8)
		{
			array[i] = (byte) (0xFF & (l >> shift));
		}
		return array;
	}
	
	public static void putIntInByteArray(int value, byte[] buf, int offset)
	{
		for (int i = 0; i < 4; i++)
		{
			int valueOffset = (3 - i) * 8;
			buf[offset + i] = (byte) ((value >>> valueOffset) & 0xFF);
		}
	}
}