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package cz.crcs.ectester.reader.ec;
import cz.crcs.ectester.applet.EC_Consts;
import cz.crcs.ectester.reader.Util;
import java.io.*;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Scanner;
import java.util.regex.Pattern;
/**
* @author Jan Jancar johny@neuromancer.sk
*/
public class EC_Params {
private static final Pattern hex = Pattern.compile("(0x|0X)?[a-fA-F\\d]+");
private short params;
private byte[][] data;
public EC_Params(short params) {
this.params = params;
this.data = new byte[numParams()][];
}
public EC_Params(short params, byte[][] data) {
this.params = params;
this.data = data;
}
public short getParams() {
return params;
}
public boolean hasParam(short param) {
return (params & param) != 0;
}
public int numParams() {
short paramMask = EC_Consts.PARAMETER_FP;
int num = 0;
while (paramMask <= EC_Consts.PARAMETER_S) {
if ((paramMask & params) != 0) {
if (paramMask == EC_Consts.PARAMETER_F2M) {
num += 3;
}
if (paramMask == EC_Consts.PARAMETER_W || paramMask == EC_Consts.PARAMETER_G){
num += 1;
}
++num;
}
paramMask = (short) (paramMask << 1);
}
return num;
}
public byte[][] getData() {
return data;
}
public boolean hasData() {
return data != null;
}
public byte[] flatten() {
ByteArrayOutputStream out = new ByteArrayOutputStream();
short paramMask = EC_Consts.PARAMETER_FP;
int i = 0;
while (paramMask <= EC_Consts.PARAMETER_S) {
short masked = (short) (params & paramMask);
if (masked != 0) {
byte[] param = data[i];
if (masked == EC_Consts.PARAMETER_F2M) {
//add m, e_1, e_2, e_3
param = Util.concatenate(param, data[i + 1], data[i + 2], data[i + 3]);
i += 3;
if (param.length != 8)
throw new RuntimeException("PARAMETER_F2M length is not 8.(should be)");
}
if (masked == EC_Consts.PARAMETER_G || masked == EC_Consts.PARAMETER_W) {
//read another param (the y coord) and put into X962 format.
byte[] y = data[++i];
param = Util.concatenate(new byte[]{4}, param, y); //<- ugly but works!
}
if (param.length == 0)
throw new RuntimeException("Empty parameter read?");
//write length
byte[] length = new byte[2];
Util.setShort(length, 0, (short) param.length);
out.write(length, 0, 2);
//write data
out.write(param, 0, param.length);
i++;
}
paramMask = (short) (paramMask << 1);
}
return (out.size() == 0) ? null : out.toByteArray();
}
public String[] expand() {
List<String> out = new ArrayList<>();
short paramMask = EC_Consts.PARAMETER_FP;
int index = 0;
while (paramMask <= EC_Consts.PARAMETER_S) {
short masked = (short) (params & paramMask);
if (masked != 0) {
byte[] param = data[index];
if (masked == EC_Consts.PARAMETER_F2M) {
//split into m, e1, e2, e3
if (param.length != 8) {
throw new RuntimeException("PARAMETER_F2M length is not 8.(should be)");
}
for (int i = 0; i < 4; ++i) {
out.add(String.format("%04x", Util.getShort(param, i * 2)));
}
} else if (masked == EC_Consts.PARAMETER_G || masked == EC_Consts.PARAMETER_W) {
//split from X962 format into X and Y
//disregard the first 04 and then split into half(uncompress)
int half = (param.length - 1) / 2;
out.add(Util.bytesToHex(param, 1, half, false));
out.add(Util.bytesToHex(param, half + 1, half, false));
} else {
//read raw
out.add(Util.bytesToHex(data[index], false));
}
index++;
}
paramMask = (short) (paramMask << 1);
}
return out.toArray(new String[out.size()]);
}
private static byte[] pad(byte[] data) {
if (data.length == 1) {
return new byte[]{(byte) 0, data[0]};
} else if (data.length == 0 || data.length > 2) {
return data;
}
return null;
}
private static byte[] parse(String param) {
byte[] data;
if (param.startsWith("0x") || param.startsWith("0X")) {
data = Util.hexToBytes(param.substring(2));
} else {
data = Util.hexToBytes(param);
}
if (data == null)
return new byte[0];
if (data.length < 2)
return pad(data);
return data;
}
private boolean readHex(String[] hex) {
if (hex.length != numParams()) {
return false;
}
for (int i = 0; i < numParams(); ++i) {
this.data[i] = parse(hex[i]);
}
return true;
}
public boolean readCSV(InputStream in) {
Scanner s = new Scanner(in);
s.useDelimiter(",|;");
List<String> data = new LinkedList<String>();
while (s.hasNext()) {
String field = s.next();
data.add(field.replaceAll("\\s+", ""));
}
if (data.isEmpty()) {
return false;
}
for (String param : data) {
if (!hex.matcher(param).matches()) {
return false;
}
}
return readHex(data.toArray(new String[data.size()]));
}
public void writeCSV(OutputStream out) throws IOException {
String[] hex = expand();
Writer w = new OutputStreamWriter(out);
for (int i = 0; i < hex.length; ++i) {
w.write(hex[i]);
if (i < hex.length - 1) {
w.write(",");
}
}
w.flush();
}
public boolean readBytes(byte[] data) {
//TODO
return false;
}
}
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