public static int Encode_Bitstring(ref Byte[] apdu, ref BACNET_BIT_STRING bit_string, int pos)
{
int len = 0;
Byte remaining_used_bits = 0;
Byte used_bytes = 0;
Byte i = 0;
if (bit_string.bits_used == 0)
{
apdu[pos] = 0;
len++;
}
else
{
used_bytes = bit_string.bytes_used();
remaining_used_bits = (Byte)(bit_string.bits_used - ((used_bytes -
1) * 8));
apdu[pos + len++] = (Byte)(8 - remaining_used_bits);
for (i = 0; i < used_bytes; i++)
{
apdu[pos + len++] = bit_string.byte_reverse_bits(bit_string.bitstring_octet(i));
}
}
return(len);
}
public static int Decode_Context_Bitstring(ref Byte[] apdu, Byte tag_number, ref BACNET_BIT_STRING bit_string, int pos)
{
UInt32 len_value = 0;
int len = 0;
len += Decode_Tag_number_and_Value(ref apdu, ref tag_number, ref len_value, pos + len);
len += Decode_Bitstring(ref apdu, len_value, ref bit_string, pos + len);
return(len);
}
public static int Encode_Context_Bitstring(ref Byte[] apdu, Byte tag_number, ref BACNET_BIT_STRING bit_string, int pos)
{
int len = 0;
UInt32 bit_string_encoded_length = 1;
bit_string_encoded_length += bit_string.bytes_used();
len = Encode_Tag(ref apdu, tag_number, true, bit_string_encoded_length, pos + len);
len += Encode_Bitstring(ref apdu, ref bit_string, pos + len);
return(len);
}
public static int Decode_Bitstring(ref Byte[] apdu, UInt32 len_value, ref BACNET_BIT_STRING bit_string, int pos)
{
int len = 0;
Byte unused_bits = 0;
UInt32 i = 0;
UInt32 bytes_used = 0;
//bitstring_init(bit_string);
bytes_used = len_value - 1;
for (i = 0; i < bytes_used; i++)
{
bit_string.set_octet((Byte)i, bit_string.byte_reverse_bits(apdu[pos + len++]));
}
unused_bits = (Byte)(apdu[pos] & 0x07);
bit_string.set_bits_used((Byte)bytes_used, unused_bits);
return(len);
}
