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import java.io.IOException
import java.math.BigInteger
/**
* This class represents a 9P connection. It provides a practical implementation with networking to the 9P methods
* described in [NinePTranslator]. Details about methods related to 9P can be found in [NinePTranslator]. Remember to
* disconnect using [disconnect] after use.
*
* Details about network-related topics can be found in [NetworkPacketTransporter] and the implementation of choice.
*
* Details about 9P messages and methods can be found in [NinePTranslator].
*
* @param netPackTrans The networking API backend of choice.
*
* @throws UnresolvableHostException if the host resolution made by [netPackTrans] failed.
*/
class NinePConnection(netPackTrans: NetworkPacketTransporter) : NinePTranslator {
/**
* Networking API.
*/
val npt: NetworkPacketTransporter = netPackTrans
/**
* Disconnect from the remote host,
*
* @throws IOException if an I/O error occurred while closing the socket.
*/
fun disconnect() {
this.npt.close()
}
/**
* Read an [nBytes]-long unsigned integer number from the connection.
*
* In 9P, binary numbers (non-textual) are specified in little-endian order (least significant byte first).
*
* @param nBytes The length of the integer number in bytes. It only works with unsigned numbers strictly greater
* than zero (zero is excluded).
* @return The number's value.
* @throws IllegalArgumentException if [nBytes] is zero or negative.
*/
private fun readInteger(nBytes: Int): BigInteger {
require(nBytes > 0)
val bytes = this.npt.receiveFixed(nBytes.toULong())
var number: BigInteger = BigInteger.valueOf(0)
for (i in 0..<bytes.size) {
number += bytes[i].toInt().toBigInteger().shl(i)
}
return number
}
/**
* Read a string from the connection.
*
* In 9P, strings are represented as a 2-byte integer (the string's size) followed by the actual UTF-8 string. The
* null terminator is forbidden in 9P messages.
*
* @return The string.
*/
private fun readString(): String {
val length = readInteger(2).toInt()
return String(this.npt.receiveFixed(length.toULong()).toByteArray())
}
// TODO: implement methods from NinePTranslator
}
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