/// <summary>
/// Decodes a base64 data array
/// </summary>
/// <param name="data">The base64 data to decode</param>
public override byte[] Decode(byte[] data)
{
if (m_Padding != null)
{
int paddingChar = (char)m_Padding;
if ((paddingChar < 0) || (paddingChar > 127))
{
throw new ArgumentException(string.Format("Invalid padding character!"), nameof(m_Padding));
}
}
//decode data
List <byte> result = new List <byte>(data.Length);
int value = 0;
int bits = 0;
foreach (byte b in data)
{
if (b == m_Padding)
{
break;
}
value <<= BitCount;
bits += BitCount;
value |= CharacterDictionary.GetValue((char)b);
if (bits >= 8)
{
bits -= 8;
int l_Out = value >> bits;
value = value & ~(0xFFFF << bits);
result.Add((byte)l_Out);
}
}
return(result.ToArray());
}
/// <summary>Decodes a Base32 data array.</summary>
/// <param name="data">The Base32 data to decode.</param>
public override byte[] Decode(byte[] data)
{
if (CharacterDictionary == null)
{
throw new InvalidOperationException($"Property {nameof(CharacterDictionary)} has to be set!");
}
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
if (Padding != null)
{
int paddingChar = (char)Padding;
if (paddingChar is < 0 or > 127)
{
throw new InvalidOperationException("Invalid padding character!");
}
}
// decode data
var result = new List <byte>(data.Length);
var value = 0;
var bits = 0;
foreach (var b in data)
{
if (b == Padding)
{
break;
}
value <<= bitCount;
bits += bitCount;
value |= CharacterDictionary.GetValue((char)b);
if (bits >= 8)
{
bits -= 8;
var outValue = value >> bits;
value &= ~(0xFFFF << bits);
result.Add((byte)outValue);
}
}
return(result.ToArray());
}