/// <summary>
/// 读取字符串
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static string ReadString(this Stream stream)
{
// read and check the length
var lengthBytes = new byte[2];
var bytesRead = stream.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");
}
var 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 = stream.Read(readBuffer, 0, nextReadSize);
Array.Copy(readBuffer, 0, stringBytes, totalRead, bytesRead);
totalRead += bytesRead;
}
return(enc.GetString(stringBytes));
}
/// <summary>
/// 写入字符串
/// </summary>
/// <param name="stream">The stream containing the string to write.</param>
/// <param name="value">The string to write.</param>
public static void WriteString(this Stream stream, string value)
{
Encoding enc = new MqttEncoding();
byte[] stringBytes = enc.GetBytes(value);
stream.Write(stringBytes, 0, stringBytes.Length);
}