private TcpSackOption(byte[] rawData, int offset, int length) throws IllegalRawDataException {
if (length < 2) {
StringBuilder sb = new StringBuilder(50);
sb.append("The raw data length must be more than 1. rawData: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
if (rawData[offset] != kind.value()) {
StringBuilder sb = new StringBuilder(100);
sb.append("The kind must be: ")
.append(kind.valueAsString())
.append(" rawData: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
this.length = rawData[1 + offset];
int lengthFieldAsInt = getLengthAsInt();
if (lengthFieldAsInt < 2) {
throw new IllegalRawDataException(
"The value of length field must be more than 1 but: " + lengthFieldAsInt);
}
if ((lengthFieldAsInt - 2) % (INT_SIZE_IN_BYTES * 2) != 0) {
StringBuilder sb = new StringBuilder(100);
sb.append("The value of length field must be an integer multiple of 8 octets long but: ")
.append(lengthFieldAsInt);
throw new IllegalRawDataException(sb.toString());
}
if (length < lengthFieldAsInt) {
StringBuilder sb = new StringBuilder(100);
sb.append("rawData is too short. length field: ")
.append(lengthFieldAsInt)
.append(", rawData: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
for (int i = 2; i < lengthFieldAsInt; i += INT_SIZE_IN_BYTES * 2) {
sacks.add(
new Sack(
ByteArrays.getInt(rawData, i + offset),
ByteArrays.getInt(rawData, i + INT_SIZE_IN_BYTES + offset)));
}
}
@Override
public byte[] getRawData() {
byte[] rawData = new byte[length()];
rawData[0] = kind.value();
rawData[1] = length;
int offset = 2;
for (Sack sack : sacks) {
System.arraycopy(
ByteArrays.toByteArray(sack.leftEdge), 0, rawData, offset, INT_SIZE_IN_BYTES);
System.arraycopy(
ByteArrays.toByteArray(sack.rightEdge),
0,
rawData,
offset + INT_SIZE_IN_BYTES,
INT_SIZE_IN_BYTES);
offset += INT_SIZE_IN_BYTES * 2;
}
return rawData;
}