org.apache.commons.io

Class HexDump


  • public class HexDump
    extends Object
    Dumps data in hexadecimal format.

    Provides a single function to take an array of bytes and display it in hexadecimal form.

    Origin of code: POI.

    • Field Detail

      • EOL

        public static final String EOL
        The line-separator (initializes to "line.separator" system property.
    • Constructor Detail

      • HexDump

        public HexDump()
        Instances should NOT be constructed in standard programming.
    • Method Detail

      • dump

        public static void dump(byte[] data,
                                long offset,
                                OutputStream stream,
                                int index)
                         throws IOException,
                                ArrayIndexOutOfBoundsException,
                                IllegalArgumentException
        Dump an array of bytes to an OutputStream. The output is formatted for human inspection, with a hexadecimal offset followed by the hexadecimal values of the next 16 bytes of data and the printable ASCII characters (if any) that those bytes represent printed per each line of output.

        The offset argument specifies the start offset of the data array within a larger entity like a file or an incoming stream. For example, if the data array contains the third kibibyte of a file, then the offset argument should be set to 2048. The offset value printed at the beginning of each line indicates where in that larger entity the first byte on that line is located.

        All bytes between the given index (inclusive) and the end of the data array are dumped.

        Parameters:
        data - the byte array to be dumped
        offset - offset of the byte array within a larger entity
        stream - the OutputStream to which the data is to be written
        index - initial index into the byte array
        Throws:
        IOException - is thrown if anything goes wrong writing the data to stream
        ArrayIndexOutOfBoundsException - if the index is outside the data array's bounds
        IllegalArgumentException - if the output stream is null

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