public override void encode(EncoderContext context)
{
//step C
var buffer = new StringBuilder();
int currentMode = EncodingMode;
while (context.HasMoreCharacters)
{
char c = context.CurrentChar;
context.Pos++;
encodeChar(c, buffer);
int count = buffer.Length;
if ((count % 3) == 0)
{
writeNextTriplet(context, buffer);
int newMode = HighLevelEncoder.lookAheadTest(context.Message, context.Pos, currentMode);
if (newMode != currentMode)
{
// Return to ASCII encodation, which will actually handle latch to new mode
context.signalEncoderChange(Encodation.ASCII);
break;
}
}
}
handleEOD(context, buffer);
}
public void encode(EncoderContext context)
{
//step F
var buffer = new StringBuilder();
while (context.HasMoreCharacters)
{
char c = context.CurrentChar;
encodeChar(c, buffer);
context.Pos++;
int count = buffer.Length;
if (count >= 4)
{
context.writeCodewords(encodeToCodewords(buffer, 0));
buffer.Remove(0, 4);
int newMode = HighLevelEncoder.lookAheadTest(context.Message, context.Pos, EncodingMode);
if (newMode != EncodingMode)
{
// Return to ASCII encodation, which will actually handle latch to new mode
context.signalEncoderChange(Encodation.ASCII);
break;
}
}
}
buffer.Append((char)31); //Unlatch
handleEOD(context, buffer);
}
private static char encodeASCIIDigits(char digit1, char digit2)
{
if (HighLevelEncoder.isDigit(digit1) && HighLevelEncoder.isDigit(digit2))
{
int num = (digit1 - 48) * 10 + (digit2 - 48);
return((char)(num + 130));
}
throw new ArgumentException("not digits: " + digit1 + digit2);
}
public void encode(EncoderContext context)
{
var buffer = new StringBuilder();
buffer.Append('\u0000'); //Initialize length field
while (context.HasMoreCharacters)
{
char c = context.CurrentChar;
buffer.Append(c);
context.Pos++;
int newMode = HighLevelEncoder.lookAheadTest(context.Message, context.Pos, EncodingMode);
if (newMode != EncodingMode)
{
// Return to ASCII encodation, which will actually handle latch to new mode
context.signalEncoderChange(Encodation.ASCII);
break;
}
}
int dataCount = buffer.Length - 1;
const int lengthFieldSize = 1;
int currentSize = context.CodewordCount + dataCount + lengthFieldSize;
context.updateSymbolInfo(currentSize);
bool mustPad = (context.SymbolInfo.dataCapacity - currentSize) > 0;
if (context.HasMoreCharacters || mustPad)
{
if (dataCount <= 249)
{
buffer[0] = (char)dataCount;
}
else if (dataCount <= 1555)
{
buffer[0] = (char)((dataCount / 250) + 249);
buffer.Insert(1, new[] { (char)(dataCount % 250) });
}
else
{
throw new InvalidOperationException(
"Message length not in valid ranges: " + dataCount);
}
}
{
var c = buffer.Length;
for (int i = 0; i < c; i++)
{
context.writeCodeword(randomize255State(
buffer[i], context.CodewordCount + 1));
}
}
}
virtual public void encode(EncoderContext context)
{
//step C
var buffer = new StringBuilder();
while (context.HasMoreCharacters)
{
char c = context.CurrentChar;
context.Pos++;
int lastCharSize = encodeChar(c, buffer);
int unwritten = (buffer.Length / 3) * 2;
int curCodewordCount = context.CodewordCount + unwritten;
context.updateSymbolInfo(curCodewordCount);
int available = context.SymbolInfo.dataCapacity - curCodewordCount;
if (!context.HasMoreCharacters)
{
//Avoid having a single C40 value in the last triplet
var removed = new StringBuilder();
if ((buffer.Length % 3) == 2 &&
(available < 2 || available > 2))
{
lastCharSize = backtrackOneCharacter(context, buffer, removed, lastCharSize);
}
while ((buffer.Length % 3) == 1 &&
((lastCharSize <= 3 && available != 1) || lastCharSize > 3))
{
lastCharSize = backtrackOneCharacter(context, buffer, removed, lastCharSize);
}
break;
}
int count = buffer.Length;
if ((count % 3) == 0)
{
int newMode = HighLevelEncoder.lookAheadTest(context.Message, context.Pos, EncodingMode);
if (newMode != EncodingMode)
{
// Return to ASCII encodation, which will actually handle latch to new mode
context.signalEncoderChange(Encodation.ASCII);
break;
}
}
}
handleEOD(context, buffer);
}
private static void encodeChar(char c, StringBuilder sb)
{
if (c >= ' ' && c <= '?')
{
sb.Append(c);
}
else if (c >= '@' && c <= '^')
{
sb.Append((char)(c - 64));
}
else
{
HighLevelEncoder.illegalCharacter(c);
}
}
protected override int encodeChar(char c, StringBuilder sb)
{
switch (c)
{
case '\r':
sb.Append('\u0000');
break;
case '*':
sb.Append('\u0001');
break;
case '>':
sb.Append('\u0002');
break;
case ' ':
sb.Append('\u0003');
break;
default:
if (c >= '0' && c <= '9')
{
sb.Append((char)(c - 48 + 4));
}
else if (c >= 'A' && c <= 'Z')
{
sb.Append((char)(c - 65 + 14));
}
else
{
HighLevelEncoder.illegalCharacter(c);
}
break;
}
return(1);
}
public void encode(EncoderContext context)
{
//step B
int n = HighLevelEncoder.determineConsecutiveDigitCount(context.Message, context.Pos);
if (n >= 2)
{
context.writeCodeword(encodeASCIIDigits(context.Message[context.Pos],
context.Message[context.Pos + 1]));
context.Pos += 2;
}
else
{
char c = context.CurrentChar;
int newMode = HighLevelEncoder.lookAheadTest(context.Message, context.Pos, EncodingMode);
if (newMode != EncodingMode)
{
switch (newMode)
{
case Encodation.BASE256:
context.writeCodeword(HighLevelEncoder.LATCH_TO_BASE256);
context.signalEncoderChange(Encodation.BASE256);
return;
case Encodation.C40:
context.writeCodeword(HighLevelEncoder.LATCH_TO_C40);
context.signalEncoderChange(Encodation.C40);
return;
case Encodation.X12:
context.writeCodeword(HighLevelEncoder.LATCH_TO_ANSIX12);
context.signalEncoderChange(Encodation.X12);
break;
case Encodation.TEXT:
context.writeCodeword(HighLevelEncoder.LATCH_TO_TEXT);
context.signalEncoderChange(Encodation.TEXT);
break;
case Encodation.EDIFACT:
context.writeCodeword(HighLevelEncoder.LATCH_TO_EDIFACT);
context.signalEncoderChange(Encodation.EDIFACT);
break;
default:
throw new InvalidOperationException("Illegal mode: " + newMode);
}
}
else if (HighLevelEncoder.isExtendedASCII(c))
{
context.writeCodeword(HighLevelEncoder.UPPER_SHIFT);
context.writeCodeword((char)(c - 128 + 1));
context.Pos++;
}
else
{
if (c == 29 &&
!context.Fnc1CodewordIsWritten)
{
context.writeCodeword((char)HighLevelEncoder.FNC1);
context.Fnc1CodewordIsWritten = true;
}
else
{
context.writeCodeword((char)(c + 1));
}
context.Pos++;
}
}
}
override protected int encodeChar(char c, StringBuilder sb)
{
if (c == ' ')
{
sb.Append('\u0003');
return(1);
}
if (c >= '0' && c <= '9')
{
sb.Append((char)(c - 48 + 4));
return(1);
}
if (c >= 'a' && c <= 'z')
{
sb.Append((char)(c - 97 + 14));
return(1);
}
if (c >= '\u0000' && c <= '\u001f')
{
sb.Append('\u0000'); //Shift 1 Set
sb.Append(c);
return(2);
}
if (c >= '!' && c <= '/')
{
sb.Append('\u0001'); //Shift 2 Set
sb.Append((char)(c - 33));
return(2);
}
if (c >= ':' && c <= '@')
{
sb.Append('\u0001'); //Shift 2 Set
sb.Append((char)(c - 58 + 15));
return(2);
}
if (c >= '[' && c <= '_')
{
sb.Append('\u0001'); //Shift 2 Set
sb.Append((char)(c - 91 + 22));
return(2);
}
if (c == '\u0060')
{
sb.Append('\u0002'); //Shift 3 Set
sb.Append((char)(c - 96));
return(2);
}
if (c >= 'A' && c <= 'Z')
{
sb.Append('\u0002'); //Shift 3 Set
sb.Append((char)(c - 65 + 1));
return(2);
}
if (c >= '{' && c <= '\u007f')
{
sb.Append('\u0002'); //Shift 3 Set
sb.Append((char)(c - 123 + 27));
return(2);
}
if (c >= '\u0080')
{
sb.Append("\u0001\u001e"); //Shift 2, Upper Shift
int len = 2;
len += encodeChar((char)(c - 128), sb);
return(len);
}
HighLevelEncoder.illegalCharacter(c);
return(-1);
}