org.nervos.appchain.protobuf.ConvertStrByte Maven / Gradle / Ivy
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package org.nervos.appchain.protobuf;
import java.util.Collections;
import java.util.List;
public class ConvertStrByte {
public static String bytesToHexString(byte[] b) {
StringBuffer result = new StringBuffer();
String hex;
for (int i = 0; i < b.length; i++) {
hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
result.append(hex);
}
return result.toString();
}
/**
* Convert hex string to byte array,
* length of byte array is src.length / 2
* length of bit of data is src.length * 4
*
* @param src hex string without "0x"
* @return byte array converted from src.
*/
public static byte[] hexStringToBytes(String src) {
src = (src.length() % 2 == 1 ? "0" : "") + src;
int l = src.length() / 2;
byte[] ret = new byte[l];
for (int i = 0; i < l; i++) {
ret[i] = (byte) Integer
.valueOf(src.substring(i * 2, i * 2 + 2), 16).byteValue();
}
return ret;
}
/**
* Convert hex string to byte array with fixed bit length
*
* @param src hex string without "0x"
* @param length length of bits of data to be sent to node.
* @return byte array converted from src.
*/
public static byte[] hexStringToBytes(String src, int length) {
int byteLength = length / 8;
if (src.length() > length / 4) {
return new byte[byteLength];
} else {
src = (src.length() % 2 == 1 ? "0" : "") + src;
int l = src.length() / 2;
byte[] value = new byte[l];
for (int i = 0; i < l; i++) {
value[i] = (byte) Integer
.valueOf(src.substring(i * 2, i * 2 + 2), 16).byteValue();
}
int m = byteLength - l;
byte[] toAdd = new byte[m];
byte[] ret = new byte[byteLength];
System.arraycopy(toAdd, 0, ret, 0, m);
System.arraycopy(value, 0, ret, m, l);
return ret;
}
}
public static String stringToHexString(String strPart) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < strPart.length(); i++) {
int ch = (int) strPart.charAt(i);
String strHex = Integer.toHexString(ch);
hexString.append(strHex);
}
return hexString.toString();
}
public static String hexStringToString(String src) {
String temp = "";
for (int i = 0; i < src.length() / 2; i++) {
temp = temp
+ (char) Integer.valueOf(src.substring(i * 2, i * 2 + 2),
16).byteValue();
}
return temp;
}
public static Byte charToByte(Character src) {
return Integer.valueOf((int)src).byteValue();
}
private static String intToHexString(int a,int len) {
len <<= 1;
String hexString = Integer.toHexString(a);
int b = len - hexString.length();
if (b > 0) {
for (int i = 0; i < b; i++) {
hexString = "0" + hexString;
}
}
return hexString;
}
}