util.java

类似QQ的功能

	public static void putQWord(byte[] buf, int off, long val)
	{
		Util.putDWord(buf, off, val, true);
	}

	// Extracts the double from the buffer (buf) at position off using the specified byte ordering (bigEndian)
	public static long getQWord(byte[] buf, int off, boolean bigEndian)
	{
		long val;
		if (bigEndian)
		{
			val = (((long) buf[off]) << 24) & 0xFF000000;
			val |= (((long) buf[++off]) << 16) & 0x00FF0000;
			val |= (((long) buf[++off]) << 8) & 0x0000FF00;
			val |= (((long) buf[++off])) & 0x000000FF;
		} else
		// Little endian
		{
			val = (((long) buf[off])) & 0x000000FF;
			val |= (((long) buf[++off]) << 8) & 0x0000FF00;
			val |= (((long) buf[++off]) << 16) & 0x00FF0000;
			val |= (((long) buf[++off]) << 24) & 0xFF000000;
		}
		return (val);
	}

	// getTlv(byte[] buf, int off) => byte[]
	public static byte[] getTlv(byte[] buf, int off)
	{
		if (off + 4 > buf.length)
			return (null); // Length check (#1)
		int length = Util.getWord(buf, off + 2);
		if (off + 4 + length > buf.length)
			return (null); // Length check (#2)
		byte[] value = new byte[length];
		System.arraycopy(buf, off + 4, value, 0, length);
		return (value);
	}

	// Extracts a string from the buffer (buf) starting at position off, ending at position off+len
	public static String byteArrayToString(byte[] buf, int off, int len,
			boolean utf8)
	{

		// Length check
		if (buf.length < off + len)
		{
			return (null);
		}

		// Remove \0's at the end
		while ((len > 0) && (buf[off + len - 1] == 0x00))
		{
			len--;
		}

		// Read string in UTF-8 format
		if (utf8)
		{
			try
			{
				byte[] buf2 = new byte[len + 2];
				Util.putWord(buf2, 0, len);
				System.arraycopy(buf, off, buf2, 2, len);
				ByteArrayInputStream bais = new ByteArrayInputStream(buf2);
				DataInputStream dis = new DataInputStream(bais);
				return (dis.readUTF());
			} catch (Exception e)
			{
				// do nothing
			}
		}

		// CP1251 or default character encoding?
		if (Options.getBoolean(Options.OPTION_CP1251_HACK))
		{
			return (byteArray1251ToString(buf, off, len));
		} else
		{
			return (new String(buf, off, len));
		}

	}

	// Extracts a string from the buffer (buf) starting at position off, ending at position off+len
	public static String byteArrayToString(byte[] buf, int off, int len)
	{
		return (Util.byteArrayToString(buf, off, len, false));
	}

	// Converts the specified buffer (buf) to a string
	public static String byteArrayToString(byte[] buf, boolean utf8)
	{
		return (Util.byteArrayToString(buf, 0, buf.length, utf8));
	}

	// Converts the specified buffer (buf) to a string
	public static String byteArrayToString(byte[] buf)
	{
		return (Util.byteArrayToString(buf, 0, buf.length, false));
	}

	// Converts the specific 4 byte max buffer to an unsigned long
	public static long byteArrayToLong(byte[] b)
	{
		long l = 0;
		l |= b[0] & 0xFF;
		l <<= 8;
		l |= b[1] & 0xFF;
		l <<= 8;
		if (b.length > 3)
		{
			l |= b[2] & 0xFF;
			l <<= 8;
			l |= b[3] & 0xFF;
		}
		return l;
	}

	// Converts a byte array to a hex string
	public static String byteArrayToHexString(byte[] buf)
	{
		StringBuffer hexString = new StringBuffer(buf.length);
		String hex;
		for (int i = 0; i < buf.length; i++)
		{
			hex = Integer.toHexString(0x0100 + (buf[i] & 0x00FF)).substring(1);
			hexString.append((hex.length() < 2 ? "0" : "") + hex);
		}
		return hexString.toString();
	}

	// Converts the specified string (val) to a byte array
	public static byte[] stringToByteArray(String val, boolean utf8)
	{
		// Write string in UTF-8 format
		if (utf8)
		{
			try
			{
				ByteArrayOutputStream baos = new ByteArrayOutputStream();
				DataOutputStream dos = new DataOutputStream(baos);
				dos.writeUTF(val);
				byte[] raw = baos.toByteArray();
				byte[] result = new byte[raw.length - 2];
				System.arraycopy(raw, 2, result, 0, raw.length - 2);
				return result;
			} catch (Exception e)
			{
				// Do nothing
			}
		}

		// CP1251 or default character encoding?
		if (Options.getBoolean(Options.OPTION_CP1251_HACK))
		{
			return (stringToByteArray1251(val));
		} else
		{
			return (val.getBytes());
		}
	}

	// Converts the specified string (val) to a byte array
	public static byte[] stringToByteArray(String val)
	{
		return (Util.stringToByteArray(val, false));
	}

	// Converts the specified string to UCS-2BE
	public static byte[] stringToUcs2beByteArray(String val)
	{
		byte[] ucs2be = new byte[val.length() * 2];
		for (int i = 0; i < val.length(); i++)
		{
			Util.putWord(ucs2be, i * 2, (int) val.charAt(i));
		}
		return (ucs2be);
	}

	// Extract a UCS-2BE string from the specified buffer (buf) starting at position off, ending at position off+len
	public static String ucs2beByteArrayToString(byte[] buf, int off, int len)
	{

		// Length check
		if ((off + len > buf.length) || (len % 2 != 0))
		{
			return (null);
		}

		// Convert
		StringBuffer sb = new StringBuffer();
		for (int i = off; i < off + len; i += 2)
		{
			sb.append((char) Util.getWord(buf, i));
		}
		return (sb.toString());

	}

	// Extracts a UCS-2BE string from the specified buffer (buf)
	public static String ucs2beByteArrayToString(byte[] buf)
	{
		return (Util.ucs2beByteArrayToString(buf, 0, buf.length));
	}

	public static void showBytes(byte[] data)
	{
		StringBuffer buffer1 = new StringBuffer(), buffer2 = new StringBuffer();

		int charaster;
		String hex;
		for (int i = 0; i < data.length; i++)
		{
			charaster = ((int) data[i]) & 0xFF;
			buffer1.append(charaster < ' ' || charaster >= 128 ? '.'
					: (char) charaster);
			hex = Integer.toHexString(((int) data[i]) & 0xFF);
			buffer2.append(hex.length() == 1 ? "0" + hex : hex);
			buffer2.append(" ");

			if (((i % 16) == 15) || (i == (data.length - 1)))
			{
				while (buffer2.length() < 16 * 3)
					buffer2.append(' ');
				System.out.print(buffer2.toString());
				System.out.println(buffer1.toString());

				buffer1.setLength(0);
				buffer2.setLength(0);
			}
		}
		System.out.println();
	}

	// Removes all CR occurences
	public static String removeCr(String val)
	{
		StringBuffer result = new StringBuffer();
		for (int i = 0; i < val.length(); i++)
		{
			char chr = val.charAt(i);
			if ((chr == 0) || (chr == '\r'))
				continue;
			result.append(chr);
		}
		return result.toString();
	}

	// Restores CRLF sequense from LF
	public static String restoreCrLf(String val)
	{
		StringBuffer result = new StringBuffer();
		int size = val.length();
		char chr;
		for (int i = 0; i < size; i++)
		{
			chr = val.charAt(i);
			if (chr == '\r')
				continue;
			if (chr == '\n')
				result.append("\r\n");
			else
				result.append(chr);
		}
		return result.toString();
	}

	public static String removeClRfAndTabs(String val)
	{
		int len = val.length();
		char[] dst = new char[len];
		char chr;
		for (int i = 0; i < len; i++)
		{
			chr = val.charAt(i);
			if ((chr == '\n') || (chr == '\r') || (chr == '\t'))
				chr = ' ';
			dst[i] = chr;
		}
		return new String(dst, 0, len);
	}

	// Compare to byte arrays (return true if equals, false otherwise)
	public static boolean byteArrayEquals(byte[] buf1, int off1, byte[] buf2,
			int off2, int len)
	{

		// Length check
		if ((off1 + len > buf1.length) || (off2 + len > buf2.length))
		{
			return (false);
		}

		// Compare bytes, stop at first mismatch
		for (int i = 0; i < len; i++)
		{
			if (buf1[off1 + i] != buf2[off2 + i])
			{
				return (false);
			}
		}

		// Return true if this point is reached
		return (true);

	}

	public static boolean byteArrayIsEmpty(byte[] buf, int len)
	{

		if (buf == null)
			return true;

		// Length check
		if (len > buf.length)
		{
			len = buf.length;
		}

		// Compare bytes, stop at first mismatch
		for (int i = 0; i < len; i++)
		{
			if (buf[i] != 0)
			{
				return (false);
			}
		}

		// Return true if this point is reached
		return (true);

	}

	// DeScramble password
	public static byte[] decipherPassword(byte[] buf)
	{
		byte[] ret = new byte[buf.length];
		for (int i = 0; i < buf.length; i++)
		{
			ret[i] = (byte) (buf[i] ^ Util.PASSENC_KEY[i % 16]);
		}
		return (ret);
	}

	// translateStatus(long status) => void
	public static int translateStatusReceived(int status)
	{
		if (status == ContactList.STATUS_OFFLINE)
			return (ContactList.STATUS_OFFLINE);
		if ((status & ContactList.STATUS_DND) != 0)
			return (ContactList.STATUS_DND);
		if ((status & ContactList.STATUS_INVISIBLE) != 0)
			return (ContactList.STATUS_INVISIBLE);
		if ((status & ContactList.STATUS_OCCUPIED) != 0)
			return (ContactList.STATUS_OCCUPIED);
		if ((status & ContactList.STATUS_NA) != 0)
			return (ContactList.STATUS_NA);
		if ((status & ContactList.STATUS_CHAT) != 0)
			return (ContactList.STATUS_CHAT);
		if ((status & ContactList.STATUS_LUNCH) == ContactList.STATUS_LUNCH)
			return (ContactList.STATUS_LUNCH);
                if ((status & ContactList.STATUS_EVIL) == ContactList.STATUS_EVIL)
			return (ContactList.STATUS_EVIL);
		if ((status & ContactList.STATUS_HOME) == ContactList.STATUS_HOME)
			return (ContactList.STATUS_HOME);
		if ((status & ContactList.STATUS_WORK) == ContactList.STATUS_WORK)
			return (ContactList.STATUS_WORK);
		if ((status & ContactList.STATUS_AWAY) != 0)
			return (ContactList.STATUS_AWAY);
		if ((status & ContactList.STATUS_DEPRESSION) == ContactList.STATUS_DEPRESSION)
			return (ContactList.STATUS_DEPRESSION);
		return (ContactList.STATUS_ONLINE);
	}

	// Get online status set value
	public static int translateStatusSend(int status)
	{
		switch (status)
		{
			case ContactList.STATUS_AWAY:		return (Util.SET_STATUS_AWAY);
			case ContactList.STATUS_CHAT:		return (Util.SET_STATUS_CHAT);
			case ContactList.STATUS_DND:		return (Util.SET_STATUS_DND);
			case ContactList.STATUS_INVISIBLE:	return (Util.SET_STATUS_INVISIBLE);
			case ContactList.STATUS_INVIS_ALL:	return (Util.SET_STATUS_INVISIBLE);
			case ContactList.STATUS_NA:			return (Util.SET_STATUS_NA);
			case ContactList.STATUS_OCCUPIED:	return (Util.SET_STATUS_OCCUPIED);
			case ContactList.STATUS_EVIL:		return (Util.SET_STATUS_EVIL);
			case ContactList.STATUS_DEPRESSION:	return (Util.SET_STATUS_DEPRESSION);
			case ContactList.STATUS_HOME:		return (Util.SET_STATUS_HOME);
			case ContactList.STATUS_WORK:		return (Util.SET_STATUS_WORK);
			case ContactList.STATUS_LUNCH:		return (Util.SET_STATUS_LUNCH);
			default:							return (Util.SET_STATUS_ONLINE);
		}
	}

	//  If the numer has only one digit add a 0
	public static String makeTwo(int number)
	{
		if (number < 10)
		{
			return ("0" + String.valueOf(number));
		} else
		{
			return (String.valueOf(number));
		}
	}

	// Byte array IP to String
	public static String ipToString(byte[] ip)
	{
		if (ip == null)
			return null;
		StringBuffer strIP = new StringBuffer();

		for (int i = 0; i < 4; i++)
		{
			int tmp = (int) ip[i] & 0xFF;
			if (strIP.length() != 0)
				strIP.append('.');
			strIP.append(tmp);
		}

		return strIP.toString();
	}

	// String IP to byte array
	public static byte[] ipToByteArray(String ip)
	{
		byte[] arrIP = explodeToBytes(ip, '.', 10);
		return ((arrIP == null) || (arrIP.length != 4)) ? null : arrIP;
	}

	//#sijapp cond.if modules_PROXY is "true"#
	// Try to parse string IP
	public static boolean isIP(String ip)
	{
		boolean isTrueIp = false;
		try
		{
			isTrueIp = (ipToByteArray(ip) != null);
		} catch (NumberFormatException e)
		{
			return false;
		}
		return isTrueIp;
	}

	//#sijapp cond.end #

	// Check is data array utf-8 string
	public static boolean isDataUTF8(byte[] array, int start, int length)
	{
		if (length == 0)
			return false;
		if (array.length < (start + length))
			return false;

		int seqLen;
		byte bt;
		for (int i = start, len = length; len > 0;)
		{
			seqLen = 0;
			bt = array[i++];
			len--;

			if ((bt & 0xE0) == 0xC0)
				seqLen = 1;
			else if ((bt & 0xF0) == 0xE0)
				seqLen = 2;
			else if ((bt & 0xF8) == 0xF0)
				seqLen = 3;
			else if ((bt & 0xFC) == 0xF8)
				seqLen = 4;
			else if ((bt & 0xFE) == 0xFC)
				seqLen = 5;

			if (seqLen == 0)
			{
				if ((bt & 0x80) == 0x80)
					return false;
				else