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package aQute.lib.hex;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.ByteBuffer;
import java.util.Formatter;
import java.util.Objects;
import java.util.regex.Pattern;
/*
* Hex converter.
*
* TODO Implement string to byte[]
*/
public class Hex {
private final static Pattern HEX_P = Pattern.compile("(?:\\p{XDigit}{2})+");
final static char[] HEX = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
public final static byte[] toByteArray(String string) {
Objects.requireNonNull(string, "The hex string must not be null.");
string = string.trim();
if ((string.length() & 1) != 0)
throw new IllegalArgumentException("a hex string must have an even length");
byte[] out = new byte[string.length() / 2];
for (int i = 0; i < out.length; i++) {
int high = nibble(string.charAt(i * 2)) << 4;
int low = nibble(string.charAt(i * 2 + 1));
out[i] = (byte) (high + low);
}
return out;
}
public static String toHex(byte b) {
char low = HEX[b & 0xF];
char high = HEX[(b & 0xF0) >> 4];
return new String(new char[] {
high, low
});
}
public final static int nibble(char c) {
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
throw new IllegalArgumentException("Not a hex digit: " + c);
}
public final static String toHexString(byte data[]) {
StringBuilder sb = new StringBuilder();
try {
append(sb, data);
} catch (IOException e) {
// cannot happen with sb
}
return sb.toString();
}
public final static void append(Appendable sb, byte[] data) throws IOException {
for (byte b : data) {
sb.append(nibble(b >> 4));
sb.append(nibble(b));
}
}
public final static char nibble(int i) {
return HEX[i & 0xF];
}
public static boolean isHex(String pub) {
return HEX_P.matcher(pub)
.matches();
}
public static boolean isHexCharacter(char c) {
if (c < '0')
return false;
if (c <= '9')
return true;
if (c < 'A')
return false;
if (c <= 'F')
return true;
// lower case are higher than upper case in Unicode!
if (c < 'a')
return false;
return c <= 'f';
}
public static String separated(byte[] bytes, String separator) {
return separated(bytes, 0, bytes.length, separator);
}
public static String separated(byte[] bytes, int start, int length, String separator) {
assert start >= 0;
assert length + start <= bytes.length;
String del = "";
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
byte x = bytes[i + start];
sb.append(del);
sb.append(toHex(x));
del = separator;
}
return sb.toString();
}
/**
* Format a buffer to show the buffer in a table with 16 bytes per row, hex
* values and ascii values are shown.
*
* @param data the buffer
* @return a String with the formatted data
*/
public static String format(byte[] data) {
if (data == null)
return "";
try (Formatter f = new Formatter()) {
StringBuilder ascii = new StringBuilder(30);
StringBuilder hex = new StringBuilder(30);
for (int rover = 0; rover < data.length; rover += 16) {
ascii.setLength(0);
hex.setLength(0);
for (int g = 0, p = rover; g < 2 && p < data.length; g++) {
hex.append(' ');
ascii.append(" ");
for (int i = 0; i < 8 && p < data.length; i++) {
byte c = data[p++];
hex.append(' ');
hex.append(toHex(c));
if (c < ' ' || c > 0x7E)
c = '.';
ascii.append((char) c);
}
}
f.format("0x%04x%-50s%s%n", rover, hex, ascii);
}
return f.toString();
}
}
/**
* Format a buffer to show the buffer in a table with 16 bytes per row, hex
* values and ascii values are shown.
*
* @param data the buffer
* @return a String with the formatted data
*/
public static String format(ByteBuffer data) {
if (data == null)
return "";
ByteBuffer bb = data.duplicate();
try (Formatter f = new Formatter()) {
StringBuilder ascii = new StringBuilder(30);
StringBuilder hex = new StringBuilder(30);
for (int rover = 0; bb.hasRemaining(); rover += 16) {
ascii.setLength(0);
hex.setLength(0);
for (int g = 0; g < 2 && bb.hasRemaining(); g++) {
hex.append(' ');
ascii.append(" ");
for (int i = 0; i < 8 && bb.hasRemaining(); i++) {
byte c = bb.get();
hex.append(' ');
hex.append(toHex(c));
if (c < ' ' || c > 0x7E)
c = '.';
ascii.append((char) c);
}
}
f.format("0x%04x%-50s%s%n", rover, hex, ascii);
}
return f.toString();
}
}
/**
* Check of a buffer is classified as binary or text. We assume a file is
* binary of it contains a 0 byte. Heuristics may differ in the future, this
* method is really to collect this decision in one place.
*
* @param data the buffer
* @return true of classified as binary
*/
public static boolean isBinary(byte[] data) {
for (byte b : data) {
if (b == 0)
return true;
}
return false;
}
/**
* Check of a buffer is classified as binary or text. We assume a file is
* binary of it contains a 0 byte. Heuristics may differ in the future, this
* method is really to collect this decision in one place.
*
* @param data the buffer
* @return true of classified as binary
*/
public static boolean isBinary(ByteBuffer data) {
ByteBuffer bb = data.duplicate();
while (bb.hasRemaining()) {
if (bb.get() == 0) {
return true;
}
}
return false;
}
public static void append(Appendable sb, byte ch) {
try {
sb.append(nibble(ch >>> 4));
sb.append(nibble(ch >>> 0));
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
public static void append(Appendable sb, short ch) {
append(sb, (byte) (0xFF & (ch >>> 8)));
append(sb, (byte) (0xFF & (ch >>> 0)));
}
public static void append(Appendable sb, char ch) {
append(sb, (short) ch);
}
public static void append(Appendable sb, int ch) {
append(sb, (short) (0xFFFF & (ch >>> 16)));
append(sb, (short) (0xFFFF & (ch >>> 0)));
}
public static void append(Appendable sb, long ch) {
append(sb, (int) (0xFFFF_FFFF & (ch >>> 32)));
append(sb, (int) (0xFFFF_FFFF & (ch >>> 0)));
}
}
