/**
* Performs high-level encoding of a PDF417 message using the algorithm described in annex P of
* ISO/IEC 15438:2001(E). If byte compaction has been selected, then only byte compaction is used.
*
* @param msg the message
* @param compaction compaction mode to use
* @param encoding character encoding used to encode in default or byte compaction or {@code null}
* for default / not applicable
* @return the encoded message (the char values range from 0 to 928)
*/
static String encodeHighLevel(String msg, Compaction compaction, Charset encoding)
throws WriterException {
// the codewords 0..928 are encoded as Unicode characters
StringBuilder sb = new StringBuilder(msg.length());
if (encoding == null) {
encoding = DEFAULT_ENCODING;
} else if (!DEFAULT_ENCODING.equals(encoding)) {
CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding.name());
if (eci != null) {
encodingECI(eci.getValue(), sb);
}
}
int len = msg.length();
int p = 0;
int textSubMode = SUBMODE_ALPHA;
// User selected encoding mode
if (compaction == Compaction.TEXT) {
encodeText(msg, p, len, sb, textSubMode);
} else if (compaction == Compaction.BYTE) {
byte[] bytes = msg.getBytes(encoding);
encodeBinary(bytes, p, bytes.length, BYTE_COMPACTION, sb);
} else if (compaction == Compaction.NUMERIC) {
sb.append((char) LATCH_TO_NUMERIC);
encodeNumeric(msg, p, len, sb);
} else {
int encodingMode = TEXT_COMPACTION; // Default mode, see 4.4.2.1
while (p < len) {
int n = determineConsecutiveDigitCount(msg, p);
if (n >= 13) {
sb.append((char) LATCH_TO_NUMERIC);
encodingMode = NUMERIC_COMPACTION;
textSubMode = SUBMODE_ALPHA; // Reset after latch
encodeNumeric(msg, p, n, sb);
p += n;
} else {
int t = determineConsecutiveTextCount(msg, p);
if (t >= 5 || n == len) {
if (encodingMode != TEXT_COMPACTION) {
sb.append((char) LATCH_TO_TEXT);
encodingMode = TEXT_COMPACTION;
textSubMode = SUBMODE_ALPHA; // start with submode alpha after latch
}
textSubMode = encodeText(msg, p, t, sb, textSubMode);
p += t;
} else {
int b = determineConsecutiveBinaryCount(msg, p, encoding);
if (b == 0) {
b = 1;
}
byte[] bytes = msg.substring(p, p + b).getBytes(encoding);
if (bytes.length == 1 && encodingMode == TEXT_COMPACTION) {
// Switch for one byte (instead of latch)
encodeBinary(bytes, 0, 1, TEXT_COMPACTION, sb);
} else {
// Mode latch performed by encodeBinary()
encodeBinary(bytes, 0, bytes.length, encodingMode, sb);
encodingMode = BYTE_COMPACTION;
textSubMode = SUBMODE_ALPHA; // Reset after latch
}
p += b;
}
}
}
}
return sb.toString();
}
private static void a(CharacterSetECI characterseteci, BitArray bitarray)
{
bitarray.appendBits(Mode.ECI.getBits(), 4);
bitarray.appendBits(characterseteci.getValue(), 8);
}
