zipkin2.internal.HexCodec Maven / Gradle / Ivy
/*
* Copyright The OpenZipkin Authors
* SPDX-License-Identifier: Apache-2.0
*/
package zipkin2.internal;
// code originally imported from zipkin.Util
public final class HexCodec {
public static final char[] HEX_DIGITS = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
/**
* Parses a 1 to 32 character lower-hex string with no prefix into an unsigned long, tossing any
* bits higher than 64.
*/
public static long lowerHexToUnsignedLong(String lowerHex) {
int length = lowerHex.length();
if (length < 1 || length > 32) throw isntLowerHexLong(lowerHex);
// trim off any high bits
int beginIndex = length > 16 ? length - 16 : 0;
return lowerHexToUnsignedLong(lowerHex, beginIndex);
}
/**
* Parses a 16 character lower-hex string with no prefix into an unsigned long, starting at the
* specified index.
*/
public static long lowerHexToUnsignedLong(String lowerHex, int index) {
long result = 0;
for (int endIndex = Math.min(index + 16, lowerHex.length()); index < endIndex; index++) {
char c = lowerHex.charAt(index);
result <<= 4;
if (c >= '0' && c <= '9') {
result |= c - '0';
} else if (c >= 'a' && c <= 'f') {
result |= c - 'a' + 10;
} else {
throw isntLowerHexLong(lowerHex);
}
}
return result;
}
static NumberFormatException isntLowerHexLong(String lowerHex) {
throw new NumberFormatException(
lowerHex + " should be a 1 to 32 character lower-hex string with no prefix");
}
HexCodec() {}
}