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package cz.crcs.ectester.common.ec;
import cz.crcs.ectester.common.util.ByteUtil;
import java.io.*;
import java.util.*;
import java.util.regex.Pattern;
/**
* A list of byte arrays for holding EC data.
* <p>
* The data can be read from a byte array via <code>readBytes()</code>, from a CSV via <code>readCSV()</code>.
* The data can be exported to a byte array via <code>flatten()</code> or to a string array via <code>expand()</code>.
*
* @author Jan Jancar johny@neuromancer.sk
*/
public abstract class EC_Data {
String id;
int count;
byte[][] data;
private static final Pattern HEX = Pattern.compile("(0x|0X)?[a-fA-F\\d]+");
EC_Data() {
}
EC_Data(int count) {
this.count = count;
this.data = new byte[count][];
}
EC_Data(byte[][] data) {
this.count = data.length;
this.data = data;
}
EC_Data(String id, int count) {
this(count);
this.id = id;
}
EC_Data(String id, byte[][] data) {
this(data);
this.id = id;
}
public String getId() {
return id;
}
public int getCount() {
return count;
}
public byte[][] getData() {
return data;
}
public byte[] getData(int index) {
return data[index];
}
public boolean hasData() {
return data != null;
}
public byte[] flatten() {
ByteArrayOutputStream out = new ByteArrayOutputStream();
for (byte[] param : data) {
byte[] length = new byte[2];
ByteUtil.setShort(length, 0, (short) param.length);
out.write(length, 0, 2);
out.write(param, 0, param.length);
}
return out.toByteArray();
}
public String[] expand() {
List<String> out = new ArrayList<>(count);
for (byte[] param : data) {
out.add(ByteUtil.bytesToHex(param, false));
}
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 = ByteUtil.hexToBytes(param.substring(2));
} else {
data = ByteUtil.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 != count) {
return false;
}
for (int i = 0; i < count; ++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<>();
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 boolean readBytes(byte[] bytes) {
if (bytes == null) {
return false;
}
int offset = 0;
for (int i = 0; i < count; i++) {
if (bytes.length - offset < 2) {
return false;
}
short paramLength = ByteUtil.getShort(bytes, offset);
offset += 2;
if (bytes.length < offset + paramLength) {
return false;
}
data[i] = new byte[paramLength];
System.arraycopy(bytes, offset, data[i], 0, paramLength);
offset += paramLength;
}
return true;
}
public boolean readByteArray(byte[][] bytes) {
if (bytes == null || count != bytes.length) {
return false;
}
for (int i = 0; i < count; ++i) {
data[i] = new byte[bytes[i].length];
System.arraycopy(bytes[i], 0, data[i], 0, bytes[i].length);
}
return true;
}
public void writeCSV(OutputStream out) throws IOException {
Writer w = new OutputStreamWriter(out);
w.write(String.join(",", expand()));
w.flush();
}
@Override
public String toString() {
return String.join(",", expand());
}
@Override
public boolean equals(Object obj) {
if (obj instanceof EC_Data) {
EC_Data other = (EC_Data) obj;
if (this.id != null || other.id != null) {
return Objects.equals(this.id, other.id);
}
if (this.count != other.count)
return false;
for (int i = 0; i < this.count; ++i) {
if (!Arrays.equals(this.data[i], other.data[i])) {
return false;
}
}
return true;
} else {
return false;
}
}
@Override
public int hashCode() {
if (this.id != null) {
return this.id.hashCode();
}
return Arrays.deepHashCode(this.data);
}
}
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