/// <summary>
/// Reads an MQTT string from the underlying stream.
/// </summary>
/// <param name="stream">The stream to read the string from.</param>
/// <returns>The Mqtt String.</returns>
public static string ReadMqttString(this Stream stringStream)
{
// read and check the length
var lengthBytes = new byte[2];
int bytesRead = stringStream.Read(lengthBytes, 0, 2);
if (bytesRead < 2)
{
throw new ArgumentException(
"The stream did not have enough bytes to describe the length of the string",
"stringStream");
}
System.Text.Encoding enc = new MqttEncoding();
short stringLength = (short)enc.GetCharCount(lengthBytes);
// read the bytes from the string, validate we have enough etc.
var stringBytes = new byte[stringLength];
bytesRead = stringStream.Read(stringBytes, 0, stringLength);
if (bytesRead < stringLength)
{
throw new ArgumentException("stream",
String.Format("The stream did not have enough bytes to match the defined string length {0}", stringLength));
}
return enc.GetString(stringBytes);
}
/// <summary>
/// Reads an MQTT string from the underlying stream.
/// </summary>
/// <param name="stringStream">The stream to read the string from.</param>
/// <returns>The Mqtt String.</returns>
public static string ReadMqttString(this Stream stringStream)
{
// read and check the length
var lengthBytes = new byte[2];
var bytesRead = stringStream.Read(lengthBytes, 0, 2);
if (bytesRead < 2)
{
throw new ArgumentException(
"The stream did not have enough bytes to describe the length of the string",
"stringStream");
}
System.Text.Encoding enc = new MqttEncoding();
var stringLength = (ushort)enc.GetCharCount(lengthBytes);
// read the bytes from the string, validate we have enough etc.
var stringBytes = new byte[stringLength];
var readBuffer = new byte[1 << 10]; // 1KB read buffer
var totalRead = 0;
// Keep reading until we have all. Intentionally synchronous
while (totalRead < stringLength) {
var remainingBytes = stringLength - totalRead;
var nextReadSize = remainingBytes > readBuffer.Length ? readBuffer.Length : remainingBytes;
bytesRead = stringStream.Read(readBuffer, 0, nextReadSize);
Array.Copy(readBuffer, 0, stringBytes, totalRead, bytesRead);
totalRead += bytesRead;
}
return enc.GetString(stringBytes);
}
