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);
}
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));
}
}
}
/// <summary>
/// Handle "end of data" situations
/// </summary>
/// <param name="context">the encoder context</param>
/// <param name="buffer">the buffer with the remaining encoded characters</param>
virtual protected void handleEOD(EncoderContext context, StringBuilder buffer)
{
int unwritten = (buffer.Length / 3) * 2;
int rest = buffer.Length % 3;
int curCodewordCount = context.CodewordCount + unwritten;
context.updateSymbolInfo(curCodewordCount);
int available = context.SymbolInfo.dataCapacity - curCodewordCount;
if (rest == 2)
{
buffer.Append('\u0000'); //Shift 1
while (buffer.Length >= 3)
{
writeNextTriplet(context, buffer);
}
if (context.HasMoreCharacters)
{
context.writeCodeword(HighLevelEncoder.C40_UNLATCH);
}
}
else if (available == 1 && rest == 1)
{
while (buffer.Length >= 3)
{
writeNextTriplet(context, buffer);
}
if (context.HasMoreCharacters)
{
context.writeCodeword(HighLevelEncoder.C40_UNLATCH);
}
// else no unlatch
context.Pos--;
}
else if (rest == 0)
{
while (buffer.Length >= 3)
{
writeNextTriplet(context, buffer);
}
if (available > 0 || context.HasMoreCharacters)
{
context.writeCodeword(HighLevelEncoder.C40_UNLATCH);
}
}
else
{
throw new InvalidOperationException("Unexpected case. Please report!");
}
context.signalEncoderChange(Encodation.ASCII);
}
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);
}
protected override void handleEOD(EncoderContext context, StringBuilder buffer)
{
context.updateSymbolInfo();
int available = context.SymbolInfo.dataCapacity - context.CodewordCount;
int count = buffer.Length;
context.Pos -= count;
if (context.RemainingCharacters > 1 || available > 1 ||
context.RemainingCharacters != available)
{
context.writeCodeword(HighLevelEncoder.X12_UNLATCH);
}
if (context.NewEncoding < 0)
{
context.signalEncoderChange(Encodation.ASCII);
}
}
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++;
}
}
}
/// <summary>
/// Handle "end of data" situations
/// </summary>
/// <param name="context">the encoder context</param>
/// <param name="buffer">the buffer with the remaining encoded characters</param>
private static void handleEOD(EncoderContext context, StringBuilder buffer)
{
try
{
int count = buffer.Length;
if (count == 0)
{
return; //Already finished
}
if (count == 1)
{
//Only an unlatch at the end
context.updateSymbolInfo();
int available = context.SymbolInfo.dataCapacity - context.CodewordCount;
int remaining = context.RemainingCharacters;
// The following two lines are a hack inspired by the 'fix' from https://sourceforge.net/p/barcode4j/svn/221/
if (remaining > available)
{
context.updateSymbolInfo(context.CodewordCount + 1);
available = context.SymbolInfo.dataCapacity - context.CodewordCount;
}
if (remaining <= available && available <= 2)
{
return; //No unlatch
}
}
if (count > 4)
{
throw new InvalidOperationException("Count must not exceed 4");
}
int restChars = count - 1;
String encoded = encodeToCodewords(buffer, 0);
bool endOfSymbolReached = !context.HasMoreCharacters;
bool restInAscii = endOfSymbolReached && restChars <= 2;
if (restChars <= 2)
{
context.updateSymbolInfo(context.CodewordCount + restChars);
int available = context.SymbolInfo.dataCapacity - context.CodewordCount;
if (available >= 3)
{
restInAscii = false;
context.updateSymbolInfo(context.CodewordCount + encoded.Length);
//available = context.symbolInfo.dataCapacity - context.getCodewordCount();
}
}
if (restInAscii)
{
context.resetSymbolInfo();
context.Pos -= restChars;
}
else
{
context.writeCodewords(encoded);
}
}
finally
{
context.signalEncoderChange(Encodation.ASCII);
}
}