/// <summary>
///
/// ISO/IEC 18004:2006(E)
/// Table 2 ¡ª Mode indicators for QR Code 2005
/// </summary>
/// <param name="bytes"></param>
/// <param name="version"></param>
/// <param name="ecLevel"></param>
/// <returns></returns>
internal static DecoderResult decode(sbyte[] bytes, Version version, ErrorCorrectionLevel ecLevel)
{
BitSource bits = new BitSource(bytes);
System.Text.StringBuilder result = new System.Text.StringBuilder(50);
CharacterSetECI currentCharacterSetECI = null;
bool fc1InEffect = false;
System.Collections.ArrayList byteSegments = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(1));
Mode mode = Mode.TERMINATOR;
int bitLen = Mode.NUMERIC.getBitsLength(version.VersionNumber);
if (version.VersionNumber > 1)
{
try
{
mode = Mode.forBits(bits.readBits(bitLen));
}
catch (System.ArgumentException iae)
{
throw ReaderException.Instance;
}
}
else
{
mode = Mode.NUMERIC;
}
if (!mode.Equals(Mode.TERMINATOR))
{
// How many characters will follow, encoded in this mode?
int count = bits.readBits(mode.getCharacterCountBits(version));
if (mode.Equals(Mode.NUMERIC))
{
decodeNumericSegment(bits, result, count);
}
else if (mode.Equals(Mode.ALPHANUMERIC))
{
decodeAlphanumericSegment(bits, result, count, fc1InEffect);
}
else if (mode.Equals(Mode.BYTE))
{
decodeByteSegment(bits, result, count, currentCharacterSetECI, byteSegments);
}
else if (mode.Equals(Mode.KANJI))
{
decodeKanjiSegment(bits, result, count);
}
else
{
throw ReaderException.Instance;
}
}
return(new DecoderResult(bytes, result.ToString(), (byteSegments.Count == 0) ? null : byteSegments, ecLevel));
}
private static void decodeByteSegment(BitSource bits, System.Text.StringBuilder result, int count, CharacterSetECI currentCharacterSetECI, System.Collections.ArrayList byteSegments)
{
sbyte[] readBytes = new sbyte[count];
if (count << 3 > bits.available())
{
throw ReaderException.Instance;
}
for (int i = 0; i < count; i++)
{
readBytes[i] = (sbyte) bits.readBits(8);
}
System.String 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 = guessEncoding(readBytes);
}
else
{
encoding = currentCharacterSetECI.EncodingName;
}
try
{
//UPGRADE_TODO: The differences in the Format of parameters for constructor 'java.lang.String.String' may cause compilation errors. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1092'"
result.Append(System.Text.Encoding.GetEncoding(encoding).GetString(SupportClass.ToByteArray(readBytes)));
}
catch (System.IO.IOException)
{
throw ReaderException.Instance;
}
byteSegments.Add(SupportClass.ToByteArray(readBytes));
}
internal static DecoderResult decode(sbyte[] bytes, Version version, ErrorCorrectionLevel ecLevel)
{
BitSource bits = new BitSource(bytes);
System.Text.StringBuilder result = new System.Text.StringBuilder(50);
CharacterSetECI currentCharacterSetECI = null;
bool fc1InEffect = false;
System.Collections.ArrayList byteSegments = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(1));
Mode mode;
do
{
// While still another segment to read...
if (bits.available() < 4)
{
// OK, assume we're done. Really, a TERMINATOR mode should have been recorded here
mode = Mode.TERMINATOR;
}
else
{
try
{
mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
}
catch (System.ArgumentException iae)
{
throw ReaderException.Instance;
}
}
if (!mode.Equals(Mode.TERMINATOR))
{
if (mode.Equals(Mode.FNC1_FIRST_POSITION) || mode.Equals(Mode.FNC1_SECOND_POSITION))
{
// We do little with FNC1 except alter the parsed result a bit according to the spec
fc1InEffect = true;
}
else if (mode.Equals(Mode.STRUCTURED_APPEND))
{
// not really supported; all we do is ignore it
// Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
bits.readBits(16);
}
else if (mode.Equals(Mode.ECI))
{
// Count doesn't apply to ECI
int value_Renamed = parseECIValue(bits);
currentCharacterSetECI = CharacterSetECI.getCharacterSetECIByValue(value_Renamed);
if (currentCharacterSetECI == null)
{
throw ReaderException.Instance;
}
}
else
{
// How many characters will follow, encoded in this mode?
int count = bits.readBits(mode.getCharacterCountBits(version));
if (mode.Equals(Mode.NUMERIC))
{
decodeNumericSegment(bits, result, count);
}
else if (mode.Equals(Mode.ALPHANUMERIC))
{
decodeAlphanumericSegment(bits, result, count, fc1InEffect);
}
else if (mode.Equals(Mode.BYTE))
{
decodeByteSegment(bits, result, count, currentCharacterSetECI, byteSegments);
}
else if (mode.Equals(Mode.KANJI))
{
decodeKanjiSegment(bits, result, count);
}
else
{
throw ReaderException.Instance;
}
}
}
}while (!mode.Equals(Mode.TERMINATOR));
return(new DecoderResult(bytes, result.ToString(), (byteSegments.Count == 0)?null:byteSegments, ecLevel));
}
private static void decodeByteSegment(BitSource bits, System.Text.StringBuilder result, int count, CharacterSetECI currentCharacterSetECI, System.Collections.ArrayList byteSegments)
{
sbyte[] readBytes = new sbyte[count];
if (count << 3 > bits.available())
{
throw ReaderException.Instance;
}
for (int i = 0; i < count; i++)
{
readBytes[i] = (sbyte)bits.readBits(8);
}
System.String 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 = guessEncoding(readBytes);
}
else
{
encoding = currentCharacterSetECI.EncodingName;
}
try
{
//UPGRADE_TODO: The differences in the Format of parameters for constructor 'java.lang.String.String' may cause compilation errors. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1092'"
#if WINDOWS_PHONE
byte[] byteArray = SupportClass.ToByteArray(readBytes);
result.Append(System.Text.Encoding.GetEncoding(encoding).GetString(byteArray, 0, byteArray.Length));
#else
result.Append(System.Text.Encoding.GetEncoding(encoding).GetString(SupportClass.ToByteArray(readBytes)));
#endif
}
catch (System.IO.IOException uce)
{
throw ReaderException.Instance;
}
byteSegments.Add(SupportClass.ToByteArray(readBytes));
}
private static void appendECI(CharacterSetECI eci, BitVector bits)
{
bits.appendBits(Mode.ECI.Bits, 4);
// This is correct for values up to 127, which is all we need now.
bits.appendBits(eci.Value, 8);
}
internal static void encode(System.String content, ErrorCorrectionLevelInternal m_EcLevelInternal, System.Collections.Hashtable hints, QRCodeInternal qrCodeInternal)
{
System.String encoding = hints == null ? null : (System.String)hints[EncodeHintType.CHARACTER_SET];
if (encoding == null)
{
encoding = DEFAULT_BYTE_MODE_ENCODING;
}
// Step 1: Choose the mode (encoding).
Mode mode = chooseMode(content, encoding);
// Step 2: Append "bytes" into "dataBits" in appropriate encoding.
BitVector dataBits = new BitVector();
appendBytes(content, mode, dataBits, encoding);
// Step 3: Initialize QR code that can contain "dataBits".
int numInputBytes = dataBits.sizeInBytes();
initQRCode(numInputBytes, m_EcLevelInternal, mode, qrCodeInternal);
// Step 4: Build another bit vector that contains header and data.
BitVector headerAndDataBits = new BitVector();
// Step 4.5: Append ECI message if applicable
if (mode == Mode.BYTE && !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding))
{
CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding);
if (eci != null)
{
appendECI(eci, headerAndDataBits);
}
}
appendModeInfo(mode, headerAndDataBits);
int numLetters = mode.Equals(Mode.BYTE) ? dataBits.sizeInBytes() : content.Length;
appendLengthInfo(numLetters, qrCodeInternal.Version, mode, headerAndDataBits);
headerAndDataBits.appendBitVector(dataBits);
// Step 5: Terminate the bits properly.
terminateBits(qrCodeInternal.NumDataBytes, headerAndDataBits);
// Step 6: Interleave data bits with error correction code.
BitVector finalBits = new BitVector();
interleaveWithECBytes(headerAndDataBits, qrCodeInternal.NumTotalBytes, qrCodeInternal.NumDataBytes, qrCodeInternal.NumRSBlocks, finalBits);
// Step 7: Choose the mask pattern and set to "QRCodeInternal".
ByteMatrix matrix = new ByteMatrix(qrCodeInternal.MatrixWidth, qrCodeInternal.MatrixWidth);
qrCodeInternal.MaskPattern = chooseMaskPattern(finalBits, qrCodeInternal.EcLevelInternal, qrCodeInternal.Version, matrix);
// Step 8. Build the matrix and set it to "QRCodeInternal".
MatrixUtil.buildMatrix(finalBits, qrCodeInternal.EcLevelInternal, qrCodeInternal.Version, qrCodeInternal.MaskPattern, matrix);
qrCodeInternal.Matrix = matrix;
// Step 9. Make sure we have a valid QR Code.
if (!qrCodeInternal.Valid)
{
throw new WriterException("Invalid QR code: " + qrCodeInternal.ToString());
}
}
internal static void appendECI(CharacterSetECI eci, BitVector bits)
{
bits.appendBits(Mode.ECI.Bits, 4);
// This is correct for values up to 127, which is all we need now.
bits.appendBits(eci.Value, 8);
}
