/// <summary>
/// Reads an ASCII-string of the specified length from this instance.
/// </summary>
/// <param name="reader">Extension method for the BinaryReader class.</param>
/// <param name="count">The number of bytes to read from the underlying
/// stream.</param>
/// <returns>A string decoded from the bytes read from the underlying
/// stream using the ASCII character set.</returns>
public static string ReadASCIIString(this BinaryReader reader, int count) {
ByteBuilder builder = new ByteBuilder();
int read = 0;
while (true) {
if (read++ >= count)
break;
byte b = reader.ReadByte();
builder.Append(b);
}
return Encoding.ASCII.GetString(builder.ToArray()).TrimEnd('\0');
}
/// <summary>
/// Creates a new "multi-precision integer" from the specified array
/// of bytes.
/// </summary>
/// <param name="data">A big-endian sequence of bytes forming the
/// integer value of the multi-precision integer.</param>
public Mpi(byte[] data) {
byte[] b = new byte[data.Length];
Array.Copy(data.Reverse().ToArray(), b, data.Length);
ByteBuilder builder = new ByteBuilder().Append(b);
// We append a null byte to the buffer which ensures the most
// significant bit will never be set and the big integer value
// always be positive.
if (b.Last() != 0)
builder.Append(0);
Value = new BigInteger(builder.ToArray());
}