public static JsonStringDictionary CreateFromStringArray(IReadOnlyList <string> userStrings)
{
if (userStrings == null)
{
throw new ArgumentNullException(nameof(userStrings));
}
JsonStringDictionary jsonStringDictionary = new JsonStringDictionary(userStrings.Count);
for (int i = 0; i < userStrings.Count; i++)
{
string userString = userStrings[i];
if (!jsonStringDictionary.TryAddString(Encoding.UTF8.GetBytes(userString).AsSpan(), out int index))
{
throw new ArgumentException($"Failed to add {userString} to {nameof(JsonStringDictionary)}.");
}
if (index != i)
{
throw new ArgumentException($"Tried to add {userString} at index {i}, but instead it was inserted at index {index}.");
}
}
return(jsonStringDictionary);
}
/// <summary>
/// Try Get Encoded User String Type Marker
/// </summary>
/// <param name="utf8Span">The value.</param>
/// <param name="jsonStringDictionary">The optional json string dictionary.</param>
/// <param name="multiByteTypeMarker">The multi byte type marker if found.</param>
/// <returns>Whether or not the Encoded User String Type Marker was found.</returns>
private static bool TryGetEncodedUserStringTypeMarker(
Utf8Span utf8Span,
JsonStringDictionary jsonStringDictionary,
out MultiByteTypeMarker multiByteTypeMarker)
{
if (jsonStringDictionary == null)
{
multiByteTypeMarker = default;
return(false);
}
const int MinStringLength = 2;
const int MaxStringLength = 128;
if ((utf8Span.Length < MinStringLength) || (utf8Span.Length > MaxStringLength))
{
multiByteTypeMarker = default;
return(false);
}
const byte OneByteCount = TypeMarker.UserString1ByteLengthMax - TypeMarker.UserString1ByteLengthMin;
if (!jsonStringDictionary.TryAddString(utf8Span, out int index))
{
multiByteTypeMarker = default;
return(false);
}
// Convert the index to a multibyte type marker
if (index < OneByteCount)
{
multiByteTypeMarker = new MultiByteTypeMarker(
length: 1,
one: (byte)(TypeMarker.UserString1ByteLengthMin + index));
}
else
{
int twoByteOffset = index - OneByteCount;
multiByteTypeMarker = new MultiByteTypeMarker(
length: 2,
one: (byte)((twoByteOffset / 0xFF) + TypeMarker.UserString2ByteLengthMin),
two: (byte)(twoByteOffset % 0xFF));
}
return(true);
}