public bool AppendECI(int value)
{
encodeCurrentBytesIfAny();
CharacterSetECI characterSetECI = CharacterSetECI.getCharacterSetECIByValue(value);
if (characterSetECI == null)
{
return(false);
//throw FormatException.getFormatInstance(new RuntimeException("Unsupported ECI value " + value));
}
currentCharset = CharacterSetECI.getEncoding(characterSetECI);
return(true);
}
private static bool decodeByteSegment(BitSource bits,
StringBuilder result,
int count,
CharacterSetECI currentCharacterSetECI,
IList <byte[]> byteSegments,
IDictionary <DecodeHintType, object> hints)
{
// Don't crash trying to read more bits than we have available.
if (count << 3 > bits.available())
{
return(false);
}
byte[] readBytes = new byte[count];
for (int i = 0; i < count; i++)
{
readBytes[i] = (byte)bits.readBits(8);
}
Encoding encoding;
if (currentCharacterSetECI == null)
{
// The spec isn't clear on this mode; see
// section 6.4.5: t does not say which encoding to assuming
// upon decoding. I have seen ISO-8859-1 used as well as
// Shift_JIS -- without anything like an ECI designator to
// give a hint.
encoding = StringUtils.guessCharset(readBytes, hints);
}
else
{
encoding = CharacterSetECI.getEncoding(currentCharacterSetECI.EncodingName);
}
if (encoding == null)
{
encoding = StringUtils.PLATFORM_DEFAULT_ENCODING_T;
}
result.Append(encoding.GetString(readBytes, 0, readBytes.Length));
byteSegments.Add(readBytes);
return(true);
}
/// <summary>
/// Gets the string encoded in the aztec code bits
/// </summary>
/// <param name="correctedBits">The corrected bits.</param>
/// <returns>the decoded string</returns>
private static String getEncodedData(bool[] correctedBits)
{
var endIndex = correctedBits.Length;
var latchTable = Table.UPPER; // table most recently latched to
var shiftTable = Table.UPPER; // table to use for the next read
var strTable = UPPER_TABLE;
var index = 0;
// Final decoded string result
// (correctedBits-5) / 4 is an upper bound on the size (all-digit result)
var result = new StringBuilder((correctedBits.Length - 5) / 4);
// Intermediary buffer of decoded bytes, which is decoded into a string and flushed
// when character encoding changes (ECI) or input ends.
using (var decodedBytes = new System.IO.MemoryStream())
{
var encoding = DEFAULT_ENCODING;
while (index < endIndex)
{
if (shiftTable == Table.BINARY)
{
if (endIndex - index < 5)
{
break;
}
int length = readCode(correctedBits, index, 5);
index += 5;
if (length == 0)
{
if (endIndex - index < 11)
{
break;
}
length = readCode(correctedBits, index, 11) + 31;
index += 11;
}
for (int charCount = 0; charCount < length; charCount++)
{
if (endIndex - index < 8)
{
index = endIndex; // Force outer loop to exit
break;
}
int code = readCode(correctedBits, index, 8);
decodedBytes.WriteByte((byte)code);
index += 8;
}
// Go back to whatever mode we had been in
shiftTable = latchTable;
strTable = codeTables[shiftTable];
}
else
{
int size = shiftTable == Table.DIGIT ? 4 : 5;
if (endIndex - index < size)
{
break;
}
int code = readCode(correctedBits, index, size);
index += size;
String str = getCharacter(strTable, code);
if ("FLG(n)".Equals(str))
{
if (endIndex - index < 3)
{
break;
}
int n = readCode(correctedBits, index, 3);
index += 3;
// flush bytes, FLG changes state
if (decodedBytes.Length > 0)
{
var byteArray = decodedBytes.ToArray();
result.Append(encoding.GetString(byteArray, 0, byteArray.Length));
decodedBytes.SetLength(0);
}
switch (n)
{
case 0:
result.Append((char)29); // translate FNC1 as ASCII 29
break;
case 7:
throw new FormatException("FLG(7) is reserved and illegal");
default:
// ECI is decimal integer encoded as 1-6 codes in DIGIT mode
int eci = 0;
if (endIndex - index < 4 * n)
{
break;
}
while (n-- > 0)
{
int nextDigit = readCode(correctedBits, index, 4);
index += 4;
if (nextDigit < 2 || nextDigit > 11)
{
throw new FormatException("Not a decimal digit");
}
eci = eci * 10 + (nextDigit - 2);
}
CharacterSetECI charsetECI = CharacterSetECI.getCharacterSetECIByValue(eci);
encoding = CharacterSetECI.getEncoding(charsetECI);
if (encoding == null)
{
throw new FormatException("Encoding for ECI " + eci + " can't be resolved");
}
break;
}
// Go back to whatever mode we had been in
shiftTable = latchTable;
strTable = codeTables[shiftTable];
}
else if (str.StartsWith("CTRL_"))
{
// Table changes
// ISO/IEC 24778:2008 prescribes ending a shift sequence in the mode from which it was invoked.
// That's including when that mode is a shift.
// Our test case dlusbs.png for issue #642 exercises that.
latchTable = shiftTable; // Latch the current mode, so as to return to Upper after U/S B/S
shiftTable = getTable(str[5]);
strTable = codeTables[shiftTable];
if (str[6] == 'L')
{
latchTable = shiftTable;
}
}
else
{
// Though stored as a table of strings for convenience, codes actually represent 1 or 2 *bytes*.
#if (PORTABLE || NETSTANDARD1_0 || NETSTANDARD1_1 || WINDOWS_PHONE || NETFX_CORE || SILVERLIGHT)
var b = StringUtils.PLATFORM_DEFAULT_ENCODING_T.GetBytes(str);
#else
var b = Encoding.ASCII.GetBytes(str);
#endif
decodedBytes.Write(b, 0, b.Length);
// Go back to whatever mode we had been in
shiftTable = latchTable;
strTable = codeTables[shiftTable];
}
}
}
if (decodedBytes.Length > 0)
{
var byteArray = decodedBytes.ToArray();
result.Append(encoding.GetString(byteArray, 0, byteArray.Length));
}
}
return(result.ToString());
}
internal static DecoderResult decode(int[] codewords, String ecLevel)
{
var result = new StringBuilder(codewords.Length * 2);
// Get compaction mode
int codeIndex = 1;
int code = codewords[codeIndex++];
var resultMetadata = new PDF417ResultMetadata();
Encoding encoding = null;
bool resultIsBinary = false;
while (codeIndex <= codewords[0])
{
switch (code)
{
case TEXT_COMPACTION_MODE_LATCH:
codeIndex = textCompaction(codewords, codeIndex, result);
break;
case BYTE_COMPACTION_MODE_LATCH:
case BYTE_COMPACTION_MODE_LATCH_6:
resultIsBinary = true;
codeIndex = byteCompaction(code, codewords, encoding ?? (encoding = CharacterSetECI.getEncoding(PDF417HighLevelEncoder.DEFAULT_ENCODING_NAME)), codeIndex, result);
break;
case MODE_SHIFT_TO_BYTE_COMPACTION_MODE:
if (encoding == null)
{
encoding = CharacterSetECI.getEncoding(PDF417HighLevelEncoder.DEFAULT_ENCODING_NAME);
}
result.Append(encoding.GetString(new [] { (byte)codewords[codeIndex++] }, 0, 1));
break;
case NUMERIC_COMPACTION_MODE_LATCH:
codeIndex = numericCompaction(codewords, codeIndex, result);
break;
case ECI_CHARSET:
var charsetECI = CharacterSetECI.getCharacterSetECIByValue(codewords[codeIndex++]);
encoding = CharacterSetECI.getEncoding(charsetECI.EncodingName);
break;
case ECI_GENERAL_PURPOSE:
// Can't do anything with generic ECI; skip its 2 characters
codeIndex += 2;
break;
case ECI_USER_DEFINED:
// Can't do anything with user ECI; skip its 1 character
codeIndex++;
break;
case BEGIN_MACRO_PDF417_CONTROL_BLOCK:
codeIndex = decodeMacroBlock(codewords, codeIndex, resultMetadata);
break;
case BEGIN_MACRO_PDF417_OPTIONAL_FIELD:
case MACRO_PDF417_TERMINATOR:
// Should not see these outside a macro block
return(null);
default:
// Default to text compaction. During testing numerous barcodes
// appeared to be missing the starting mode. In these cases defaulting
// to text compaction seems to work.
codeIndex--;
codeIndex = textCompaction(codewords, codeIndex, result);
break;
}
if (codeIndex < 0)
{
return(null);
}
if (codeIndex < codewords.Length)
{
code = codewords[codeIndex++];
}
else
{
return(null);
}
}
if (result.Length == 0)
{
return(null);
}
// Add Raw data if Binary data is present.
byte[] rawData = null;
if (resultIsBinary)
{
rawData = Encoding.GetEncoding(PDF417HighLevelEncoder.DEFAULT_ENCODING_NAME).GetBytes(result.ToString());
}
var decoderResult = new DecoderResult(rawData, result.ToString(), null, ecLevel);
decoderResult.Other = resultMetadata;
return(decoderResult);
}
/// <summary>
/// Encodes the specified content.
/// </summary>
/// <param name="content">The content.</param>
/// <param name="ecLevel">The ec level.</param>
/// <param name="hints">The hints.</param>
/// <returns></returns>
public static QRCode encode(String content,
ErrorCorrectionLevel ecLevel,
IDictionary <EncodeHintType, object> hints)
{
Version version;
BitArray headerAndDataBits;
Mode mode;
var hasGS1FormatHint = hints != null && hints.ContainsKey(EncodeHintType.GS1_FORMAT) &&
hints[EncodeHintType.GS1_FORMAT] != null && Convert.ToBoolean(hints[EncodeHintType.GS1_FORMAT].ToString());
var hasCompactionHint = hints != null && hints.ContainsKey(EncodeHintType.QR_COMPACT) &&
hints[EncodeHintType.QR_COMPACT] != null && Convert.ToBoolean(hints[EncodeHintType.QR_COMPACT].ToString());
// Determine what character encoding has been specified by the caller, if any
bool hasEncodingHint = hints != null && hints.ContainsKey(EncodeHintType.CHARACTER_SET);
#if !SILVERLIGHT || WINDOWS_PHONE
var encoding = DEFAULT_BYTE_MODE_ENCODING;
var encodingName = hasEncodingHint ? (String)hints[EncodeHintType.CHARACTER_SET] : null;
if (encodingName != null)
{
var eci = CharacterSetECI.getCharacterSetECIByName(encodingName);
if (eci == null)
{
throw new WriterException(string.Format("Encoding {0} isn't supported", encodingName));
}
encoding = CharacterSetECI.getEncoding(eci);
if (encoding == null)
{
throw new WriterException(string.Format("Encoding {0} isn't supported", encodingName));
}
}
var generateECI = hasEncodingHint || !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding);
#else
// Silverlight supports only UTF-8 and UTF-16 out-of-the-box
var encoding = StringUtils.PLATFORM_DEFAULT_ENCODING_T;
// caller of the method can only control if the ECI segment should be written
// character set is fixed to UTF-8; but some scanners doesn't like the ECI segment
var generateECI = hasEncodingHint;
#endif
if (hasCompactionHint)
{
mode = Mode.BYTE;
var priorityEncoding = encoding.Equals(DEFAULT_BYTE_MODE_ENCODING) ? null : encoding;
var rn = MinimalEncoder.encode(content, null, priorityEncoding, hasGS1FormatHint, ecLevel);
headerAndDataBits = new BitArray();
rn.getBits(headerAndDataBits);
version = rn.getVersion();
}
else
{
// Pick an encoding mode appropriate for the content. Note that this will not attempt to use
// multiple modes / segments even if that were more efficient.
mode = chooseMode(content, encoding);
// This will store the header information, like mode and
// length, as well as "header" segments like an ECI segment.
var headerBits = new BitArray();
// Append ECI segment if applicable
if (mode == Mode.BYTE && generateECI)
{
var eci = CharacterSetECI.getCharacterSetECI(encoding);
if (eci != null)
{
var eciIsExplicitDisabled = (hints != null && hints.ContainsKey(EncodeHintType.DISABLE_ECI) && hints[EncodeHintType.DISABLE_ECI] != null && Convert.ToBoolean(hints[EncodeHintType.DISABLE_ECI].ToString()));
if (!eciIsExplicitDisabled)
{
appendECI(eci, headerBits);
}
}
}
// Append the FNC1 mode header for GS1 formatted data if applicable
if (hasGS1FormatHint)
{
// GS1 formatted codes are prefixed with a FNC1 in first position mode header
appendModeInfo(Mode.FNC1_FIRST_POSITION, headerBits);
}
// (With ECI in place,) Write the mode marker
appendModeInfo(mode, headerBits);
// Collect data within the main segment, separately, to count its size if needed. Don't add it to
// main payload yet.
var dataBits = new BitArray();
appendBytes(content, mode, dataBits, encoding);
if (hints != null && hints.ContainsKey(EncodeHintType.QR_VERSION))
{
int versionNumber = Int32.Parse(hints[EncodeHintType.QR_VERSION].ToString());
version = Version.getVersionForNumber(versionNumber);
int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, version);
if (!willFit(bitsNeeded, version, ecLevel))
{
throw new WriterException("Data too big for requested version");
}
}
else
{
version = recommendVersion(ecLevel, mode, headerBits, dataBits);
}
headerAndDataBits = new BitArray();
headerAndDataBits.appendBitArray(headerBits);
// Find "length" of main segment and write it
var numLetters = mode == Mode.BYTE ? dataBits.SizeInBytes : content.Length;
appendLengthInfo(numLetters, version, mode, headerAndDataBits);
// Put data together into the overall payload
headerAndDataBits.appendBitArray(dataBits);
}
var ecBlocks = version.getECBlocksForLevel(ecLevel);
var numDataBytes = version.TotalCodewords - ecBlocks.TotalECCodewords;
// Terminate the bits properly.
terminateBits(numDataBytes, headerAndDataBits);
// Interleave data bits with error correction code.
var finalBits = interleaveWithECBytes(headerAndDataBits,
version.TotalCodewords,
numDataBytes,
ecBlocks.NumBlocks);
var qrCode = new QRCode
{
ECLevel = ecLevel,
Mode = mode,
Version = version
};
// Choose the mask pattern and set to "qrCode".
var dimension = version.DimensionForVersion;
var matrix = new ByteMatrix(dimension, dimension);
// Enable manual selection of the pattern to be used via hint
var maskPattern = -1;
if (hints != null && hints.ContainsKey(EncodeHintType.QR_MASK_PATTERN))
{
var hintMaskPattern = Int32.Parse(hints[EncodeHintType.QR_MASK_PATTERN].ToString());
maskPattern = QRCode.isValidMaskPattern(hintMaskPattern) ? hintMaskPattern : -1;
}
if (maskPattern == -1)
{
maskPattern = chooseMaskPattern(finalBits, ecLevel, version, matrix);
}
qrCode.MaskPattern = maskPattern;
// Build the matrix and set it to "qrCode".
MatrixUtil.buildMatrix(finalBits, ecLevel, version, maskPattern, matrix);
qrCode.Matrix = matrix;
return(qrCode);
}
