internal static System.String decode(sbyte[] bytes, Version version)
{
BitSource bits = new BitSource(bytes);
System.Text.StringBuilder result = new System.Text.StringBuilder();
Mode mode;
do
{
// While still another segment to read...
mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
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);
}
else if (mode.Equals(Mode.BYTE))
{
decodeByteSegment(bits, result, count);
}
else if (mode.Equals(Mode.KANJI))
{
decodeKanjiSegment(bits, result, count);
}
else
{
throw new ReaderException("Unsupported mode indicator");
}
}
}
while (!mode.Equals(Mode.TERMINATOR));
// I thought it wasn't allowed to leave extra bytes after the terminator but it happens
/*
int bitsLeft = bits.available();
if (bitsLeft > 0) {
if (bitsLeft > 6 || bits.readBits(bitsLeft) != 0) {
throw new ReaderException("Excess bits or non-zero bits after terminator mode indicator");
}
}
*/
return result.ToString();
}
/**
* See ISO 16022:2006, 5.2.9 and Annex B, B.2
*/
private static void decodeBase256Segment(BitSource bits, StringBuilder result, System.Collections.ArrayList byteSegments)
{
// Figure out how long the Base 256 Segment is.
int d1 = bits.readBits(8);
int count;
if (d1 == 0) { // Read the remainder of the symbol
count = bits.available() / 8;
} else if (d1 < 250) {
count = d1;
} else {
count = 250 * (d1 - 249) + bits.readBits(8);
}
byte[] bytes = new byte[count];
for (int i = 0; i < count; i++) {
bytes[i] = unrandomize255State(bits.readBits(8), i);
}
byteSegments.Add(bytes);
try {
result.Append(System.Text.Encoding.GetEncoding("iso-8859-1").GetString(bytes));
} catch (Exception uee) {
throw new Exception("Platform does not support required encoding: " + uee);
}
}
/**
* See ISO 16022:2006, 5.2.3 and Annex C, Table C.2
*/
private static int decodeAsciiSegment(BitSource bits, StringBuilder result, StringBuilder resultTrailer)
{
bool upperShift = false;
do {
int oneByte = bits.readBits(8);
if (oneByte == 0) {
throw new ReaderException();
} else if (oneByte <= 128) { // ASCII data (ASCII value + 1)
oneByte = upperShift ? (oneByte + 128) : oneByte;
upperShift = false;
result.Append((char) (oneByte - 1));
return ASCII_ENCODE;
} else if (oneByte == 129) { // Pad
return PAD_ENCODE;
} else if (oneByte <= 229) { // 2-digit data 00-99 (Numeric Value + 130)
int value = oneByte - 130;
if (value < 10) { // padd with '0' for single digit values
result.Append('0');
}
result.Append(value);
} else if (oneByte == 230) { // Latch to C40 encodation
return C40_ENCODE;
} else if (oneByte == 231) { // Latch to Base 256 encodation
return BASE256_ENCODE;
} else if (oneByte == 232) { // FNC1
throw new ReaderException();
} else if (oneByte == 233) { // Structured Append
throw new ReaderException();
} else if (oneByte == 234) { // Reader Programming
throw new ReaderException();
} else if (oneByte == 235) { // Upper Shift (shift to Extended ASCII)
upperShift = true;
} else if (oneByte == 236) { // 05 Macro
result.Append("[)>\u001E05\u001D");
resultTrailer.Insert(0, "\u001E\u0004");
} else if (oneByte == 237) { // 06 Macro
result.Append("[)>\u001E06\u001D");
resultTrailer.Insert(0, "\u001E\u0004");
} else if (oneByte == 238) { // Latch to ANSI X12 encodation
return ANSIX12_ENCODE;
} else if (oneByte == 239) { // Latch to Text encodation
return TEXT_ENCODE;
} else if (oneByte == 240) { // Latch to EDIFACT encodation
return EDIFACT_ENCODE;
} else if (oneByte == 241) { // ECI Character
// TODO(bbrown): I think we need to support ECI
throw new ReaderException();
} else if (oneByte >= 242) { // Not to be used in ASCII encodation
throw new ReaderException();
}
} while (bits.available() > 0);
return ASCII_ENCODE;
}
/**
* See ISO 16022:2006, 5.2.7
*/
private static void decodeAnsiX12Segment(BitSource bits, StringBuilder result)
{
// Three ANSI X12 values are encoded in a 16-bit value as
// (1600 * C1) + (40 * C2) + C3 + 1
int[] cValues = new int[3];
do {
// If there is only one byte left then it will be encoded as ASCII
if (bits.available() == 8) {
return;
}
int firstByte = bits.readBits(8);
if (firstByte == 254) { // Unlatch codeword
return;
}
parseTwoBytes(firstByte, bits.readBits(8), cValues);
for (int i = 0; i < 3; i++) {
int cValue = cValues[i];
if (cValue == 0) { // X12 segment terminator <CR>
result.Append('\r');
} else if (cValue == 1) { // X12 segment separator *
result.Append('*');
} else if (cValue == 2) { // X12 sub-element separator >
result.Append('>');
} else if (cValue == 3) { // space
result.Append(' ');
} else if (cValue < 14) { // 0 - 9
result.Append((char) (cValue + 44));
} else if (cValue < 40) { // A - Z
result.Append((char) (cValue + 51));
} else {
throw new ReaderException();
}
}
} while (bits.available() > 0);
}
private static void decodeKanjiSegment(BitSource bits, System.Text.StringBuilder result, int count)
{
// Each character will require 2 bytes. Read the characters as 2-byte pairs
// and decode as Shift_JIS afterwards
sbyte[] buffer = new sbyte[2 * count];
int offset = 0;
while (count > 0)
{
// Each 13 bits encodes a 2-byte character
int twoBytes = bits.readBits(13);
int assembledTwoBytes = ((twoBytes / 0x0C0) << 8) | (twoBytes % 0x0C0);
if (assembledTwoBytes < 0x01F00)
{
// In the 0x8140 to 0x9FFC range
assembledTwoBytes += 0x08140;
}
else
{
// In the 0xE040 to 0xEBBF range
assembledTwoBytes += 0x0C140;
}
buffer[offset] = (sbyte)(assembledTwoBytes >> 8);
buffer[offset + 1] = (sbyte)assembledTwoBytes;
offset += 2;
count--;
}
// Shift_JIS may not be supported in some environments:
try
{
byte[] bytes = SupportClass.ToByteArray(buffer);
//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("Shift_JIS").GetString(bytes, 0, bytes.Length));
}
catch (System.IO.IOException uee)
{
throw new ReaderException("SHIFT_JIS encoding is not supported on this device");
}
}
private static void decodeNumericSegment(BitSource bits, System.Text.StringBuilder result, int count)
{
// Read three digits at a time
while (count >= 3)
{
// Each 10 bits encodes three digits
int threeDigitsBits = bits.readBits(10);
if (threeDigitsBits >= 1000)
{
throw new ReaderException("Illegal value for 3-digit unit: " + threeDigitsBits);
}
result.Append(ALPHANUMERIC_CHARS[threeDigitsBits / 100]);
result.Append(ALPHANUMERIC_CHARS[(threeDigitsBits / 10) % 10]);
result.Append(ALPHANUMERIC_CHARS[threeDigitsBits % 10]);
count -= 3;
}
if (count == 2)
{
// Two digits left over to read, encoded in 7 bits
int twoDigitsBits = bits.readBits(7);
if (twoDigitsBits >= 100)
{
throw new ReaderException("Illegal value for 2-digit unit: " + twoDigitsBits);
}
result.Append(ALPHANUMERIC_CHARS[twoDigitsBits / 10]);
result.Append(ALPHANUMERIC_CHARS[twoDigitsBits % 10]);
}
else if (count == 1)
{
// One digit left over to read
int digitBits = bits.readBits(4);
if (digitBits >= 10)
{
throw new ReaderException("Illegal value for digit unit: " + digitBits);
}
result.Append(ALPHANUMERIC_CHARS[digitBits]);
}
}
private static void decodeAlphanumericSegment(BitSource bits, System.Text.StringBuilder result, int count)
{
// Read two characters at a time
while (count > 1)
{
int nextTwoCharsBits = bits.readBits(11);
result.Append(ALPHANUMERIC_CHARS[nextTwoCharsBits / 45]);
result.Append(ALPHANUMERIC_CHARS[nextTwoCharsBits % 45]);
count -= 2;
}
if (count == 1)
{
// special case: one character left
result.Append(ALPHANUMERIC_CHARS[bits.readBits(6)]);
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private static void decodeByteSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count, com.google.zxing.common.CharacterSetECI currentCharacterSetECI, java.util.Collection<byte[]> byteSegments, java.util.Map<com.google.zxing.DecodeHintType,?> hints) throws com.google.zxing.FormatException
private static void decodeByteSegment(BitSource bits, StringBuilder result, int count, CharacterSetECI currentCharacterSetECI, ICollection<sbyte[]> byteSegments, IDictionary<DecodeHintType, object> hints)
{
// Don't crash trying to read more bits than we have available.
if (count << 3 > bits.available())
{
throw FormatException.FormatInstance;
}
sbyte[] readBytes = new sbyte[count];
for (int i = 0; i < count; i++)
{
readBytes[i] = (sbyte) bits.readBits(8);
}
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 = StringUtils.guessEncoding(readBytes, hints);
}
else
{
encoding = currentCharacterSetECI.name();
}
try
{
//result.Append(new string(readBytes, encoding));
result.Append(GetEncodedStringFromBuffer(readBytes, encoding));
}
catch (System.IO.IOException)
{
throw FormatException.FormatInstance;
}
byteSegments.Add(readBytes);
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private static int parseECIValue(com.google.zxing.common.BitSource bits) throws com.google.zxing.FormatException
private static int parseECIValue(BitSource bits)
{
int firstByte = bits.readBits(8);
if ((firstByte & 0x80) == 0)
{
// just one byte
return firstByte & 0x7F;
}
if ((firstByte & 0xC0) == 0x80)
{
// two bytes
int secondByte = bits.readBits(8);
return ((firstByte & 0x3F) << 8) | secondByte;
}
if ((firstByte & 0xE0) == 0xC0)
{
// three bytes
int secondThirdBytes = bits.readBits(16);
return ((firstByte & 0x1F) << 16) | secondThirdBytes;
}
throw FormatException.FormatInstance;
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: static com.google.zxing.common.DecoderResult decode(byte[] bytes, Version version, ErrorCorrectionLevel ecLevel, java.util.Map<com.google.zxing.DecodeHintType,?> hints) throws com.google.zxing.FormatException
internal static DecoderResult decode(sbyte[] bytes, Version version, ErrorCorrectionLevel ecLevel, IDictionary<DecodeHintType, object> hints)
{
BitSource bits = new BitSource(bytes);
StringBuilder result = new StringBuilder(50);
IList<sbyte[]> byteSegments = new List<sbyte[]>(1);
try
{
CharacterSetECI currentCharacterSetECI = null;
bool fc1InEffect = false;
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
{
mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
}
if (mode != Mode.TERMINATOR)
{
if (mode == Mode.FNC1_FIRST_POSITION || mode == 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 == Mode.STRUCTURED_APPEND)
{
if (bits.available() < 16)
{
throw FormatException.FormatInstance;
}
// 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 == Mode.ECI)
{
// Count doesn't apply to ECI
int value = parseECIValue(bits);
currentCharacterSetECI = CharacterSetECI.getCharacterSetECIByValue(value);
if (currentCharacterSetECI == null)
{
throw FormatException.FormatInstance;
}
}
else
{
// First handle Hanzi mode which does not start with character count
if (mode == Mode.HANZI)
{
//chinese mode contains a sub set indicator right after mode indicator
int subset = bits.readBits(4);
int countHanzi = bits.readBits(mode.getCharacterCountBits(version));
if (subset == GB2312_SUBSET)
{
decodeHanziSegment(bits, result, countHanzi);
}
}
else
{
// "Normal" QR code modes:
// How many characters will follow, encoded in this mode?
int count = bits.readBits(mode.getCharacterCountBits(version));
if (mode == Mode.NUMERIC)
{
decodeNumericSegment(bits, result, count);
}
else if (mode == Mode.ALPHANUMERIC)
{
decodeAlphanumericSegment(bits, result, count, fc1InEffect);
}
else if (mode == Mode.BYTE)
{
decodeByteSegment(bits, result, count, currentCharacterSetECI, byteSegments, hints);
}
else if (mode == Mode.KANJI)
{
decodeKanjiSegment(bits, result, count);
}
else
{
throw FormatException.FormatInstance;
}
}
}
}
} while (mode != Mode.TERMINATOR);
}
catch (System.ArgumentException iae)
{
// from readBits() calls
throw FormatException.FormatInstance;
}
return new DecoderResult(bytes, result.ToString(), byteSegments.Count == 0 ? null : byteSegments, ecLevel == null ? null : ecLevel.ToString());
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private static void decodeNumericSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count) throws com.google.zxing.FormatException
private static void decodeNumericSegment(BitSource bits, StringBuilder result, int count)
{
// Read three digits at a time
while (count >= 3)
{
// Each 10 bits encodes three digits
if (bits.available() < 10)
{
throw FormatException.FormatInstance;
}
int threeDigitsBits = bits.readBits(10);
if (threeDigitsBits >= 1000)
{
throw FormatException.FormatInstance;
}
result.Append(toAlphaNumericChar(threeDigitsBits / 100));
result.Append(toAlphaNumericChar((threeDigitsBits / 10) % 10));
result.Append(toAlphaNumericChar(threeDigitsBits % 10));
count -= 3;
}
if (count == 2)
{
// Two digits left over to read, encoded in 7 bits
if (bits.available() < 7)
{
throw FormatException.FormatInstance;
}
int twoDigitsBits = bits.readBits(7);
if (twoDigitsBits >= 100)
{
throw FormatException.FormatInstance;
}
result.Append(toAlphaNumericChar(twoDigitsBits / 10));
result.Append(toAlphaNumericChar(twoDigitsBits % 10));
}
else if (count == 1)
{
// One digit left over to read
if (bits.available() < 4)
{
throw FormatException.FormatInstance;
}
int digitBits = bits.readBits(4);
if (digitBits >= 10)
{
throw FormatException.FormatInstance;
}
result.Append(toAlphaNumericChar(digitBits));
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private static void decodeKanjiSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count) throws com.google.zxing.FormatException
private static void decodeKanjiSegment(BitSource bits, StringBuilder result, int count)
{
// Don't crash trying to read more bits than we have available.
if (count * 13 > bits.available())
{
throw FormatException.FormatInstance;
}
// Each character will require 2 bytes. Read the characters as 2-byte pairs
// and decode as Shift_JIS afterwards
sbyte[] buffer = new sbyte[2 * count];
int offset = 0;
while (count > 0)
{
// Each 13 bits encodes a 2-byte character
int twoBytes = bits.readBits(13);
int assembledTwoBytes = ((twoBytes / 0x0C0) << 8) | (twoBytes % 0x0C0);
if (assembledTwoBytes < 0x01F00)
{
// In the 0x8140 to 0x9FFC range
assembledTwoBytes += 0x08140;
}
else
{
// In the 0xE040 to 0xEBBF range
assembledTwoBytes += 0x0C140;
}
buffer[offset] = (sbyte)(assembledTwoBytes >> 8);
buffer[offset + 1] = (sbyte) assembledTwoBytes;
offset += 2;
count--;
}
// Shift_JIS may not be supported in some environments:
try
{
//result.Append(new string(buffer, StringUtils.SHIFT_JIS));
result.Append(GetEncodedStringFromBuffer(buffer, StringUtils.SHIFT_JIS));
}
catch (System.IO.IOException)
{
throw FormatException.FormatInstance;
}
}
/// <summary>
/// See specification GBT 18284-2000
/// </summary>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private static void decodeHanziSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count) throws com.google.zxing.FormatException
private static void decodeHanziSegment(BitSource bits, StringBuilder result, int count)
{
// Don't crash trying to read more bits than we have available.
if (count * 13 > bits.available())
{
throw FormatException.FormatInstance;
}
// Each character will require 2 bytes. Read the characters as 2-byte pairs
// and decode as GB2312 afterwards
sbyte[] buffer = new sbyte[2 * count];
int offset = 0;
while (count > 0)
{
// Each 13 bits encodes a 2-byte character
int twoBytes = bits.readBits(13);
int assembledTwoBytes = ((twoBytes / 0x060) << 8) | (twoBytes % 0x060);
if (assembledTwoBytes < 0x003BF)
{
// In the 0xA1A1 to 0xAAFE range
assembledTwoBytes += 0x0A1A1;
}
else
{
// In the 0xB0A1 to 0xFAFE range
assembledTwoBytes += 0x0A6A1;
}
buffer[offset] = (sbyte)((assembledTwoBytes >> 8) & 0xFF);
buffer[offset + 1] = (sbyte)(assembledTwoBytes & 0xFF);
offset += 2;
count--;
}
try
{
//result.Append(new string(buffer, StringUtils.GB2312));
result.Append(GetEncodedStringFromBuffer(buffer, StringUtils.GB2312));
}
catch (System.IO.IOException)
{
throw FormatException.FormatInstance;
}
}
/**
* See ISO 16022:2006, 5.2.8 and Annex C Table C.3
*/
private static void decodeEdifactSegment(BitSource bits, StringBuilder result)
{
bool unlatch = false;
do {
// If there is only two or less bytes left then it will be encoded as ASCII
if (bits.available() <= 16) {
return;
}
for (int i = 0; i < 4; i++) {
int edifactValue = bits.readBits(6);
// Check for the unlatch character
if (edifactValue == 0x2B67) { // 011111
unlatch = true;
// If we encounter the unlatch code then continue reading because the Codeword triple
// is padded with 0's
}
if (!unlatch) {
if ((edifactValue & 32) == 0) { // no 1 in the leading (6th) bit
edifactValue |= 64; // Add a leading 01 to the 6 bit binary value
}
result.Append(edifactValue);
}
}
} while (!unlatch && bits.available() > 0);
}
private static void decodeByteSegment(BitSource bits, System.Text.StringBuilder result, int count)
{
sbyte[] readBytes = new sbyte[count];
if (count << 3 > bits.available())
{
throw new ReaderException("Count too large: " + count);
}
for (int i = 0; i < count; i++)
{
readBytes[i] = (sbyte)bits.readBits(8);
}
// 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.
System.String encoding = guessEncoding(readBytes);
try
{
byte[] bytes = SupportClass.ToByteArray(readBytes);
//System.Windows.Forms.MessageBox.Show("encodings: "+ System.Text.Encoding.());
//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(bytes, 0, bytes.Length));
}
catch (System.IO.IOException uce)
{
//UPGRADE_TODO: The equivalent in .NET for method 'java.lang.Throwable.toString' may return a different value. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1043'"
throw new ReaderException(uce.ToString());
}
}
/**
* See ISO 16022:2006, 5.2.6 and Annex C, Table C.2
*/
private static void decodeTextSegment(BitSource bits, StringBuilder result)
{
// Three Text values are encoded in a 16-bit value as
// (1600 * C1) + (40 * C2) + C3 + 1
// TODO(bbrown): The Upper Shift with Text doesn't work in the 4 value scenario all the time
bool upperShift = false;
int[] cValues = new int[3];
do {
// If there is only one byte left then it will be encoded as ASCII
if (bits.available() == 8) {
return;
}
int firstByte = bits.readBits(8);
if (firstByte == 254) { // Unlatch codeword
return;
}
parseTwoBytes(firstByte, bits.readBits(8), cValues);
int shift = 0;
for (int i = 0; i < 3; i++) {
int cValue = cValues[i];
switch (shift) {
case 0:
if (cValue < 3) {
shift = cValue + 1;
} else {
if (upperShift) {
result.Append((char) (TEXT_BASIC_SET_CHARS[cValue] + 128));
upperShift = false;
} else {
result.Append(TEXT_BASIC_SET_CHARS[cValue]);
}
}
break;
case 1:
if (upperShift) {
result.Append((char) (cValue + 128));
upperShift = false;
} else {
result.Append(cValue);
}
shift = 0;
break;
case 2:
// Shift 2 for Text is the same encoding as C40
if (cValue < 27) {
if (upperShift) {
result.Append((char) (C40_SHIFT2_SET_CHARS[cValue] + 128));
upperShift = false;
} else {
result.Append(C40_SHIFT2_SET_CHARS[cValue]);
}
} else if (cValue == 27) { // FNC1
throw new ReaderException();
} else if (cValue == 30) { // Upper Shift
upperShift = true;
} else {
throw new ReaderException();
}
shift = 0;
break;
case 3:
if (upperShift) {
result.Append((char) (TEXT_SHIFT3_SET_CHARS[cValue] + 128));
upperShift = false;
} else {
result.Append(TEXT_SHIFT3_SET_CHARS[cValue]);
}
shift = 0;
break;
default:
throw new ReaderException();
}
}
} while (bits.available() > 0);
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private static void decodeAlphanumericSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count, boolean fc1InEffect) throws com.google.zxing.FormatException
private static void decodeAlphanumericSegment(BitSource bits, StringBuilder result, int count, bool fc1InEffect)
{
// Read two characters at a time
int start = result.Length;
while (count > 1)
{
if (bits.available() < 11)
{
throw FormatException.FormatInstance;
}
int nextTwoCharsBits = bits.readBits(11);
result.Append(toAlphaNumericChar(nextTwoCharsBits / 45));
result.Append(toAlphaNumericChar(nextTwoCharsBits % 45));
count -= 2;
}
if (count == 1)
{
// special case: one character left
if (bits.available() < 6)
{
throw FormatException.FormatInstance;
}
result.Append(toAlphaNumericChar(bits.readBits(6)));
}
// See section 6.4.8.1, 6.4.8.2
if (fc1InEffect)
{
// We need to massage the result a bit if in an FNC1 mode:
for (int i = start; i < result.Length; i++)
{
if (result[i] == '%')
{
if (i < result.Length - 1 && result[i + 1] == '%')
{
// %% is rendered as %
result.Remove(i + 1, 1);
}
else
{
// In alpha mode, % should be converted to FNC1 separator 0x1D
result[i] = (char) 0x1D;
}
}
}
}
}