Package gnu.java.zrtp.utils

Class ZrtpUtils

  • public class ZrtpUtils
extends Object
    Some helpful functions, all public static
    Author:
    Werner Dittmann <Werner.Dittmann@t-online.de>

    • Constructor Summary

      Constructors 
      Constructor Description
      ZrtpUtils()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static int byteArrayCompare​(byte[] arg1, byte[] arg2, int length)  
      static char[] bytesToHexString​(byte[] in, int length)  
      static void hexdump​(String title, byte[] buf, int len)
      Dump a buffer in hex and readable format.
      static byte[] int32ToArray​(int data)
      Convert a 32 bit integer into a byte array, network order.
      static void int32ToArrayInPlace​(int data, byte[] buffer, int offset)
      Convert a 32 bit integer into a byte array, network order.
      static int readInt​(byte[] buffer, int offset)
      Extract four bytes from a buffer and convert into an integer.
      static byte[] readRegion​(byte[] buffer, int offset, int length)
      Read a byte region from specified offset with specified length
      static short readShort​(byte[] buffer, int offset)
      Extract two bytes from a buffer and convert into a short integer.
      static byte[] short16ToArray​(int data)
      Convert a 16 bit integer into a byte array, network order.
      static void short16ToArrayInPlace​(int data, byte[] buffer, int offset)
      Convert a 16 bit integer into a byte array, network order.

    • Constructor Detail

      • ZrtpUtils

        public ZrtpUtils()

    • Method Detail

      • int32ToArray

        public static byte[] int32ToArray​(int data)
        Convert a 32 bit integer into a byte array, network order.
        Parameters:
        data - the 32 bit integer to send over the network
        Returns:
        the byte array conating the converted integer

      • int32ToArrayInPlace

        public static void int32ToArrayInPlace​(int data,
                                       byte[] buffer,
                                       int offset)
        Convert a 32 bit integer into a byte array, network order. This method places the converted four bytes into the buffer starting at the given offset.
        Parameters:
        data - the 32 bit integer to send over the network
        buffer - the byte array that receives the converted integer
        offset - the offset into the buffer

      • short16ToArray

        public static byte[] short16ToArray​(int data)
        Convert a 16 bit integer into a byte array, network order.
        Parameters:
        data - the 16 bit integer to send over the network
        Returns:
        the byte array conating the converted short integer

      • short16ToArrayInPlace

        public static void short16ToArrayInPlace​(int data,
                                         byte[] buffer,
                                         int offset)
        Convert a 16 bit integer into a byte array, network order.
        Parameters:
        data - the 16 bit integer to send over the network

      • readShort

        public static short readShort​(byte[] buffer,
                              int offset)
        Extract two bytes from a buffer and convert into a short integer. The method reads 2 bytes from the buffer starting at the specified offset and converts it into a short integer. The buffer contains the bytes in network order.
        Parameters:
        buffer - The buffer containing the bytes in network order.
        offset - Offset into buffer.

      • readInt

        public static int readInt​(byte[] buffer,
                          int offset)
        Extract four bytes from a buffer and convert into an integer. The method reads 4 bytes from the buffer starting at the specified offset and converts it into a integer. The buffer contains the bytes in network order.
        Parameters:
        buffer - The buffer containing the bytes in network order.
        offset - Offset into buffer.

      • readRegion

        public static byte[] readRegion​(byte[] buffer,
                                int offset,
                                int length)
        Read a byte region from specified offset with specified length
        Parameters:
        buffer - the buffer to copy from
        offset - start offset of the region to be read
        length - length of the region to be read
        Returns:
        byte array of [offset, offset + length)

      • hexdump

        public static void hexdump​(String title,
                           byte[] buf,
                           int len)
        Dump a buffer in hex and readable format.
        Parameters:
        title - Printed at the beginning of the dump
        buf - Byte buffer to dump
        len - Number of bytes to dump, should be less or equal the buffer length

      • bytesToHexString

        public static char[] bytesToHexString​(byte[] in,
                                      int length)

      • byteArrayCompare

        public static int byteArrayCompare​(byte[] arg1,
                                   byte[] arg2,
                                   int length)