public static byte[] ToByteArrayFromString(string str)
{
if (str.IsNullOrEmpty())
{
return(null);
}
int mod4 = str.Length % 4;
if (mod4 > 0)
{
str += new string('*', 4 - mod4);
}
byte[] data = Convert.FromBase64String(str);
if (data.Length < 4)
{
return(null);
}
int length = Int32Ex.FromBytes(data);
if (length == 0)
{
return(new byte[0]);
}
if (length < 0 || data.Length < 4 + length)
{
return(null);
}
return(data.Skip(4).Take(length).ToArray());
}
public static Int32 FromStringValue(string value)
{
if (value.IsNullOrEmpty() || value.Length < 4)
{
throw new Exception("value is to small to contain any value");
}
byte[] bytes = new byte[4];
for (int i = 0; i < bytes.Length; i++)
{
bytes[i] = (byte)value[i];
}
//byte[] bytes = System.Text.Encoding.UTF8.GetBytes(value);
return(Int32Ex.FromBytes(bytes));
}
/// <summary>
/// decodes bytes into string from [some offset bytes][length][data][other bytes] array
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
/// <returns></returns>
public static string GetStringDecoded(this byte[] array, int offset)
{
if (array == null)
{
return(null);
}
int length = Int32Ex.FromBytes(array, offset);
if (length < 0 || length > array.Length + 4 + offset)
{
return(null);
}
return(stringEx.GetString(array.SubArray(4 + offset, length)));
}
/// <summary>
/// Decodes array using encoded length - decodes bytes into bytes from [some offset bytes][length][data][other bytes] array
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
/// <returns></returns>
public static byte[] DecodeWithLength(this byte[] array, int offset)
{
if (array == null || array.Length < 4)
{
return(null);
}
int length = Int32Ex.FromBytes(array, offset);
if (length < 0 || length > array.Length + 4 + offset)
{
return(null);
}
else if (length == 0)
{
return(new byte[0]);
}
return(array.SubArray(4 + offset, length));
}
