--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jlibrtp/StaticProcs.java Sat Mar 14 22:15:41 2009 +0100
@@ -0,0 +1,270 @@
+/**
+ * Java RTP Library (jlibrtp)
+ * Copyright (C) 2006 Arne Kepp
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+package jlibrtp;
+
+/**
+ * Generic functions for converting between unsigned integers and byte[]s.
+ *
+ * @author Arne Kepp
+ */
+public class StaticProcs {
+
+ /**
+ * Converts an integer into an array of bytes.
+ * Primarily used for 16 bit unsigned integers, ignore the first two octets.
+ *
+ * @param i a 16 bit unsigned integer in an int
+ * @return byte[2] representing the integer as unsigned, most significant bit first.
+ */
+ public static byte[] uIntIntToByteWord(int i) {
+ byte[] byteWord = new byte[2];
+ byteWord[0] = (byte) ((i >> 8) & 0x000000FF);
+ byteWord[1] = (byte) (i & 0x00FF);
+ return byteWord;
+ }
+
+ /**
+ * Converts an unsigned 32 bit integer, stored in a long, into an array of bytes.
+ *
+ * @param j a long
+ * @return byte[4] representing the unsigned integer, most significant bit first.
+ */
+ public static byte[] uIntLongToByteWord(long j) {
+ int i = (int) j;
+ byte[] byteWord = new byte[4];
+ byteWord[0] = (byte) ((i >>> 24) & 0x000000FF);
+ byteWord[1] = (byte) ((i >> 16) & 0x000000FF);
+ byteWord[2] = (byte) ((i >> 8) & 0x000000FF);
+ byteWord[3] = (byte) (i & 0x00FF);
+ return byteWord;
+ }
+
+ /**
+ * Combines two bytes (most significant bit first) into a 16 bit unsigned integer.
+ *
+ * @param index of most significant byte
+ * @return int with the 16 bit unsigned integer
+ */
+ public static int bytesToUIntInt(byte[] bytes, int index) {
+ int accum = 0;
+ int i = 1;
+ for (int shiftBy = 0; shiftBy < 16; shiftBy += 8 ) {
+ accum |= ( (long)( bytes[index + i] & 0xff ) ) << shiftBy;
+ i--;
+ }
+ return accum;
+ }
+
+ /**
+ * Combines four bytes (most significant bit first) into a 32 bit unsigned integer.
+ *
+ * @param bytes
+ * @param index of most significant byte
+ * @return long with the 32 bit unsigned integer
+ */
+ public static long bytesToUIntLong(byte[] bytes, int index) {
+ long accum = 0;
+ int i = 3;
+ for (int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) {
+ accum |= ( (long)( bytes[index + i] & 0xff ) ) << shiftBy;
+ i--;
+ }
+ return accum;
+ }
+
+ /**
+ * Converts an arbitrary number of bytes, assumed to represent an unsigned integer,
+ * to a Java long
+ */
+ /*public static long bytesToUintLong(byte[] bytes, int firstByte, int lastByte) {
+ long accum = 0;
+ int i = lastByte - firstByte;
+ if(i > 7) {
+ System.out.println("!!!! StaticProcs.bytesToUintLong() Can't convert more than 63 bits!");
+ return -1;
+ }
+ int stop = (i+1)*8;
+
+ for (int shiftBy = 0; shiftBy < stop; shiftBy += 8 ) {
+ accum |= ( (long)( bytes[firstByte + i] & 0xff ) ) << shiftBy;
+ i--;
+ }
+ return accum;
+ }*/
+
+ /**
+ * Converts an arbitrary number of bytes, assumed to represent an unsigned integer,
+ * to a Java int
+ */
+ /* public static int bytesToUintInt(byte[] bytes, int firstByte, int lastByte) {
+ int accum = 0;
+ int i = lastByte - firstByte;
+ if(i > 3) {
+ System.out.println("!!!! StaticProcs.bytesToUintLong() Can't convert more than 31 bits!");
+ return -1;
+ }
+ int stop = (i+1)*8;
+
+ for (int shiftBy = 0; shiftBy < stop; shiftBy += 8 ) {
+ accum |= ( (long)( bytes[firstByte + i] & 0xff ) ) << shiftBy;
+ i--;
+ }
+ return accum;
+ }*/
+
+ /**
+ * Recreates a UNIX timestamp based on the NTP representation used
+ * in RTCP SR packets
+ *
+ * @param ntpTs1 from RTCP SR packet
+ * @param ntpTs2 from RTCP SR packet
+ * @return the UNIX timestamp
+ */
+ public static long undoNtpMess(long ntpTs1, long ntpTs2) {
+ long timeVal = (ntpTs1 - 2208988800L)*1000;
+
+ double tmp = (1000.0*(double)ntpTs2)/((double)4294967295L);
+ long ms = (long) tmp;
+ //System.out.println(" timeVal: " +Long.toString(timeVal)+ " ms " + Long.toString(ms));
+ timeVal += ms;
+
+ return timeVal;
+ }
+
+
+
+ /**
+ * Get the bits of a byte
+ *
+ * @param aByte the byte you wish to convert
+ * @return a String of 1's and 0's
+ */
+ public static String bitsOfByte(byte aByte) {
+ int temp;
+ String out = "";
+ for(int i=7; i>=0; i--) {
+ temp = (aByte >>> i);
+ temp &= 0x0001;
+ out += (""+temp);
+ }
+ return out;
+ }
+
+ /**
+ * Get the hex representation of a byte
+ *
+ * @param aByte the byte you wish to convert
+ * @return a String of two chars 0-1,A-F
+ */
+ public static String hexOfByte(byte aByte) {
+ String out = "";
+
+ for(int i=0; i<2; i++) {
+ int temp = (int) aByte;
+ if(temp < 0) {
+ temp +=256;
+ }
+ if(i == 0) {
+ temp = temp/16;
+ } else {
+ temp = temp%16;
+ }
+
+ if( temp > 9) {
+ switch(temp) {
+ case 10: out += "A"; break;
+ case 11: out += "B"; break;
+ case 12: out += "C"; break;
+ case 13: out += "D"; break;
+ case 14: out += "E"; break;
+ case 15: out += "F"; break;
+ }
+ } else {
+ out += Integer.toString(temp);
+ }
+ }
+ return out;
+ }
+
+ /**
+ * Get the hex representation of a byte
+ *
+ * @param hex 4 bytes the byte you wish to convert
+ * @return a String of two chars 0-1,A-F
+ */
+ public static byte byteOfHex(byte[] hex) {
+ byte retByte = 0;
+ Byte tmp;
+ int val = 0;
+
+ // First 4 bits
+ tmp = hex[0];
+ val = tmp.intValue();
+ if(val > 64) {
+ // Letter
+ val -= 55;
+ } else {
+ // Number
+ val -= 48;
+ }
+ retByte = ((byte) (val << 4));
+
+ // Last 4 bits
+ tmp = hex[1];
+ val = tmp.intValue();
+ if(val > 64) {
+ // Letter
+ val -= 55;
+ } else {
+ // Number
+ val -= 48;
+ }
+ retByte |= ((byte) val);
+
+ return retByte;
+ }
+
+
+ /**
+ * Print the bits of a byte to standard out. For debugging.
+ *
+ * @param aByte the byte you wish to print out.
+ */
+ public static void printBits(byte aByte) {
+ int temp;
+ for(int i=7; i>=0; i--) {
+ temp = (aByte >>> i);
+ temp &= 0x0001;
+ System.out.print(""+temp);
+ }
+ System.out.println();
+ }
+
+ public static String bitsOfBytes(byte[] bytes) {
+ String str = "";
+ //Expensive, but who cares
+ for(int i=0; i<bytes.length; i++ ) {
+ str += bitsOfByte(bytes[i]) + " ";
+ if((i + 1) % 4 == 0)
+ str += "\n";
+ }
+
+ return str;
+ }
+}
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