/// <summary>
/// Creates a segment representing the specified text string.
/// The segment is encoded in alphanumeric mode.
/// <para>
/// Allowed characters are: 0 to 9, A to Z (uppercase only), space,
/// dollar, percent, asterisk, plus, hyphen, period, slash, colon.
/// </para>
/// </summary>
/// <param name="text">The text to encode, consisting of allowed characters only.</param>
/// <returns>The created segment containing the text.</returns>
/// <exception cref="ArgumentNullException"><c>text</c> is <c>null</c>.</exception>
/// <exception cref="ArgumentOutOfRangeException"><c>text</c> contains non-encodable characters.</exception>
public static QrSegment MakeAlphanumeric(string text)
{
Objects.RequireNonNull(text);
if (!AlphanumericRegex.IsMatch(text))
{
throw new ArgumentOutOfRangeException(nameof(text), "String contains unencodable characters in alphanumeric mode");
}
BitArray ba = new BitArray(0);
int i;
for (i = 0; i <= text.Length - 2; i += 2)
{
// Process groups of 2
uint temp = (uint)AlphanumericCharset.IndexOf(text[i]) * 45;
temp += (uint)AlphanumericCharset.IndexOf(text[i + 1]);
BitArrayExtensions.AppendBits(ba, temp, 11);
}
if (i < text.Length) // 1 character remaining
{
BitArrayExtensions.AppendBits(ba, (uint)AlphanumericCharset.IndexOf(text[i]), 6);
}
return(new QrSegment(Mode.Alphanumeric, text.Length, ba));
}
/// <summary>
/// Creates a segment representing an Extended Channel Interpretation
/// (ECI) designator with the specified assignment value.
/// </summary>
/// <param name="assignVal">The ECI assignment number (see the AIM ECI specification).</param>
/// <returns>The created segment containing the data.</returns>
/// <exception cref="ArgumentOutOfRangeException"><c>assignVal</c>is outside the range [0, 10<sup>6</sup>).</exception>
public static QrSegment MakeEci(int assignVal)
{
BitArray ba = new BitArray(0);
if (assignVal < 0)
{
throw new ArgumentOutOfRangeException(nameof(assignVal), "ECI assignment value out of range");
}
if (assignVal < 1 << 7)
{
BitArrayExtensions.AppendBits(ba, (uint)assignVal, 8);
}
else if (assignVal < 1 << 14)
{
BitArrayExtensions.AppendBits(ba, 2, 2);
BitArrayExtensions.AppendBits(ba, (uint)assignVal, 14);
}
else if (assignVal < 1000000)
{
BitArrayExtensions.AppendBits(ba, 6, 3);
BitArrayExtensions.AppendBits(ba, (uint)assignVal, 21);
}
else
{
throw new ArgumentOutOfRangeException(nameof(assignVal), "ECI assignment value out of range");
}
return(new QrSegment(Mode.Eci, 0, ba));
}
/// <summary>
/// Creates a segment representing the specified binary data
/// encoded in byte mode. All input byte arrays are acceptable.
/// <para>
/// Any text string can be converted to UTF-8 bytes (using <c>Encoding.UTF8.GetBytes(str)</c>)
/// and encoded as a byte mode segment.
/// </para>
/// </summary>
/// <param name="data">The binary data to encode.</param>
/// <returns>The created segment containing the specified data.</returns>
/// <exception cref="ArgumentNullException"><c>data</c> is <c>null</c>.</exception>
public static QrSegment MakeBytes(byte[] data)
{
Objects.RequireNonNull(data);
BitArray ba = new BitArray(0);
foreach (byte b in data)
{
BitArrayExtensions.AppendBits(ba, b, 8);
}
return(new QrSegment(Mode.Byte, data.Length, ba));
}
/// <summary>
/// Creates a segment encoding the specified text in Kanji mode.
/// <para>
/// Broadly speaking, the set of encodable characters are Kanji used in Japan,
/// Hiragana, Katakana, East Asian punctuation, full-width ASCII, Greek, and Cyrillic.
/// Examples of non-encodable characters include ordinary ASCII, half-width Katakana,
/// more extensive Chinese Hanzi.
/// </para>
/// </summary>
/// <param name="text">The text to encoding, containing only characters allowed by the Kanji encoding.</param>
/// <returns>The created segment respresenting the specified text.</returns>
/// <exception cref="ArgumentNullException"><paramref name="text"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="text"/> contains non-encodable characters.</exception>
/// <seealso cref="IsEncodableAsKanji"/>
public static QrSegment MakeKanji(string text)
{
Objects.RequireNonNull(text);
BitArray ba = new BitArray(0);
foreach (char t in text)
{
ushort val = UnicodeToQrKanji[t];
if (val == 0xffff)
{
throw new ArgumentOutOfRangeException(text.GetType().Name, "String contains non-kanji-mode characters");
}
BitArrayExtensions.AppendBits(ba, val, 13);
}
return(new QrSegment(QrSegment.Mode.Kanji, text.Length, ba));
}
/// <summary>
/// Creates a segment representing the specified string of decimal digits.
/// The segment is encoded in numeric mode.
/// </summary>
/// <param name="digits">The text to encode, consisting of digits from 0 to 9 only.</param>
/// <returns>The created segment containing the text.</returns>
/// <exception cref="ArgumentNullException"><c>digits</c> is <c>null</c>.</exception>
/// <exception cref="ArgumentOutOfRangeException"><c>digits</c> contains non-digit characters</exception>
public static QrSegment MakeNumeric(string digits)
{
Objects.RequireNonNull(digits);
if (!NumericRegex.IsMatch(digits))
{
throw new ArgumentOutOfRangeException(nameof(digits), "String contains non-numeric characters");
}
BitArray ba = new BitArray(0);
for (int i = 0; i < digits.Length;)
{
// Consume up to 3 digits per iteration
int n = Math.Min(digits.Length - i, 3);
BitArrayExtensions.AppendBits(ba, uint.Parse(digits.Substring(i, n)), n * 3 + 1);
i += n;
}
return(new QrSegment(Mode.Numeric, digits.Length, ba));
}
