static Base64Encoding()
{
Lex = new Base64Encoding(lexAlphabet);
Mime = new Base64Encoding(mimeAlphabet, mimePaddingSymbol);
Url = new Base64Encoding(urlAlphabet);
}
public static TryResult <String> TryToBase64String(Value128 data, Base64Encoding base64Encoding)
{
if (base64Encoding == null)
{
return(encodeFailResult);
}
Char[] result;
// Get padding symbol
var paddingSymbol = base64Encoding.PaddingSymbol;
if (paddingSymbol.HasValue)
{
result = new Char[24];
result[22] = result[23] = paddingSymbol.Value;
}
else
{
result = new Char[22];
}
var higherHalf = data.HigherHalf;
var lowerHalf = data.LowerHalf;
// Get alphabet
var alphabet = base64Encoding.Alphabet;
for (Int32 indexH = 0, indexL = 11, shiftH = 58, shiftL = 56; indexH < 10; indexH++, indexL++, shiftH -= 6, shiftL -= 6)
{
result[indexH] = alphabet[(Int32)(higherHalf >> shiftH) & 0x3F];
result[indexL] = alphabet[(Int32)(lowerHalf >> shiftL) & 0x3F];
}
result[10] = alphabet[(Int32)(((higherHalf << 2) & 0x3C) | ((lowerHalf >> 62) & 0x03))];
result[21] = alphabet[(Int32)((lowerHalf << 4) & 0x30)];
return(TryResult <String> .CreateSuccess(new String(result)));
}
public void TestCtor()
{
try // null alphabet
{
var x = new Base64Encoding(null, Base64Encoding.Mime.LookupTable, '=');
Assert.Fail(typeof(ArgumentNullException).ToString());
}
catch (ArgumentNullException)
{
}
try // bad length alphabet
{
var x = new Base64Encoding("1245645", Base64Encoding.Mime.LookupTable, null);
Assert.Fail(typeof(ArgumentException).ToString());
}
catch (ArgumentException)
{
}
try // look-up table null
{
var x = new Base64Encoding(Base64Encoding.Mime.Alphabet, null, '=');
Assert.Fail(typeof(ArgumentNullException).ToString());
}
catch (ArgumentNullException)
{
}
try // look-up table bad length
{
var x = new Base64Encoding(Base64Encoding.Mime.Alphabet, new Byte[20], null);
Assert.Fail(typeof(ArgumentNullException).ToString());
}
catch (ArgumentException)
{
}
}
public static TryResult <Value128> TryFromBase64String(String data, Int32 offset, Base64Encoding base64Encoding)
{
// Check input values
if ((data == null) || (offset > data.Length - base64EncodedSymbolsCount) || (base64Encoding == null))
{
return(convertFailResult);
}
// Get look-up table
var lookupTable = base64Encoding.LookupTable;
var lastIndex = offset + 10;
var symbol10 = (UInt64)lookupTable[data[lastIndex] & 0x7F];
var symbol21 = (UInt64)lookupTable[data[offset + 21] & 0x7F];
// Check symbol
if ((symbol10 | symbol21) == 0xFF)
{
return(convertFailResult);
}
// Calculate higher half
var higherHalf = symbol10 >> 2;
// Calculate lower half
var lowerHalf = symbol10 << 62 | symbol21 >> 4;
// Decode symbols
for (Int32 indexH = offset, indexL = offset + 11, shiftH = 58, shiftL = 56; indexH < lastIndex; indexH++, indexL++, shiftH -= 6, shiftL -= 6)
{
// Get symbols
var symbolH = data[indexH] & 0x7F;
var symbolL = data[indexL] & 0x7F;
// Get symbols values
var symbolHValue = (UInt64)lookupTable[symbolH];
var symbolLValue = (UInt64)lookupTable[symbolL];
// Check symbol
if ((symbolHValue | symbolLValue) == 0xFF)
{
return(convertFailResult);
}
higherHalf |= symbolHValue << shiftH;
lowerHalf |= symbolLValue << shiftL;
}
// Initialize a new instance
var result = new Value128(higherHalf, lowerHalf);
return(TryResult <Value128> .CreateSuccess(result));
}
