public AlphabetButton(uint width, uint height, AlphabetChars letter)
{
this.SetSize (width, height);
this.letter = letter;
Initialise ();
}
public AlphabetButton(uint width, uint height, AlphabetChars letter)
{
this.SetSize(width, height);
this.letter = letter;
Initialise();
}
protected void InvokeLetterClicked(AlphabetChars letter)
{
if (LetterClicked != null)
{
LetterClicked(this, new AlphabetEventArgs(letter));
}
}
protected void InvokeLetterClicked(AlphabetChars letter)
{
if (LetterClicked!=null) LetterClicked (this, new AlphabetEventArgs (letter));
}
public AlphabetButton this[AlphabetChars index]
{
get { return buttons[index]; }
}
public AlphabetEventArgs(AlphabetChars letter)
: base()
{
this.letter = letter;
}
public override byte[] Encode(object data)
{
string strVal = data as string;
if (string.IsNullOrEmpty(strVal))
{
return(null);
}
int alphabetCount = AlphabetChars.Length;
// 8.2.2
if (alphabetCount < 2 || alphabetCount > FIConsts.TWO_POWER_TWENTY)
{
throw new LtFastInfosetException(
"Failed to write FastInfoset. Invalid Restricted Alphabet. Alphabet must contain between 2 and 2^20 characters.");
}
// see how many bits we need per char
int bits = 2;
while ((1 << bits) <= alphabetCount)
{
bits++;
}
// populate memory buffer withe encoded bytes
MemoryStream buffer = new MemoryStream();
int len = strVal.Length;
if (bits == 8)
{
// easy 1 to 1 mapping
int n = 0;
while (n < len)
{
char c = strVal[n++];
int pos = AlphabetChars.IndexOf(c);
if (pos == -1)
{
throw new LtFastInfosetException(
"Failed to write FastInfoset. Character not found in Restricted Alphabet [" + c + "].");
}
buffer.WriteByte((byte)AlphabetChars[pos]);
}
}
else if (bits == 4)
{
// semi-easy 2 to 1 mapping
int n = 0;
while (n < len)
{
char c = strVal[n++];
int pos = AlphabetChars.IndexOf(c);
if (pos == -1)
{
throw new LtFastInfosetException(
"Failed to write FastInfoset. Character not found in Restricted Alphabet [" + c + "].");
}
if (n == len)
{
// fill last 4 bits with terminator value 1111
buffer.WriteByte((byte)((AlphabetChars[pos] << 4) | 0xF));
}
else
{
char c2 = strVal[n++];
int pos2 = AlphabetChars.IndexOf(c2);
if (pos2 == -1)
{
throw new LtFastInfosetException(
"Failed to write FastInfoset. Character not found in Restricted Alphabet [" + c2 +
"].");
}
buffer.WriteByte((byte)((AlphabetChars[pos] << 4) | AlphabetChars[pos2]));
}
}
}
else
{
// tricky arbitry mapping
throw new LtFastInfosetException(
"Failed to write FastInfoset. Unsupported Feature in FIRestrictedAlphabet Encode.");
}
return(buffer.ToArray());
}
public AlphabetButton this [AlphabetChars index] {
get { return(buttons[index]); }
}
public AlphabetEventArgs(AlphabetChars letter) : base()
{
this.letter = letter;
}