Java Hex Calculate toHexFromBin(final String binSymbols)

Description

Transform a string of binary symbols to a string of hex symbols

License

Open Source License

Parameter

Parameter	Description
binSymbols	The binary symbol string to transform

Return

The hex string corresponding to the input binary string

Declaration

public static String toHexFromBin(final String binSymbols) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    /** Allowable hex values */
    private final static String[] hexSymbols = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c",
            "d", "e", "f" };
    public final static int BITS_PER_HEX_DIGIT = 4;
    public final static int BINARY_RADIX = 2;
    public static final String BINARY_STRING_PREFIX1 = "0b";
    public static final String BINARY_STRING_PREFIX2 = "0B";

    /**/*from   w w w. j a v a  2  s.  c o m*/
     * Transform a string of binary symbols to a string of hex symbols
     *
     * @param binSymbols
     *            The binary symbol string to transform
     * @return The hex string corresponding to the input binary string
     */
    public static String toHexFromBin(final String binSymbols) {
        String bits = stripBinaryPrefix(binSymbols);

        while ((bits.length() % BITS_PER_HEX_DIGIT) != 0) {
            bits = "0" + bits;
        }

        StringBuilder hex = new StringBuilder(bits.length() / BITS_PER_HEX_DIGIT);
        for (int i = 0; i < bits.length(); i += BITS_PER_HEX_DIGIT) {
            String bitsToAdd = null;
            if ((i + BITS_PER_HEX_DIGIT) < bits.length()) {
                bitsToAdd = bits.substring(i, i + BITS_PER_HEX_DIGIT);
            } else {
                bitsToAdd = bits.substring(i);
            }
            hex.append(toHexCharFromBin(bitsToAdd));
        }

        return (hex.toString());
    }

    public static String stripBinaryPrefix(String binSymbols) {
        if (binSymbols.startsWith(BINARY_STRING_PREFIX1)) {
            binSymbols = binSymbols.substring(BINARY_STRING_PREFIX1.length());
        } else if (binSymbols.startsWith(BINARY_STRING_PREFIX2)) {
            binSymbols = binSymbols.substring(BINARY_STRING_PREFIX2.length());
        }

        return (binSymbols);
    }

    public static char toHexCharFromBin(final String bin) {
        String bits = stripBinaryPrefix(bin);
        while (bits.length() < BITS_PER_HEX_DIGIT) {
            bits = "0" + bits;
        }

        if (bits.length() > BITS_PER_HEX_DIGIT) {
            throw new IllegalArgumentException(
                    "Input bit string \"" + bin + "\" is too long to be a hexadecimal character.");
        }

        int value = Integer.parseInt(bits, BINARY_RADIX);
        return (hexSymbols[value].charAt(0));
    }
}

Related

1. toHexDump(byte[] ab, int cBytesPerLine)
2. toHexDump(byte[] buffer, int offset, int length, boolean hex, boolean ascii)
3. toHexDump(byte[] bytes)
4. toHexEscape(final int u0)
5. toHexFilter(String inAscii)
6. toHexFromByte(byte b)
7. toHexFromByte(final byte b)
8. toHexFromBytes(byte[] bytes)
9. toHexFromBytes(final byte[] bytes)