public static void Ctor_Validating_FromDelegate()
{
object expectedState = new object();
SpanAction <byte, object> spanAction = (span, actualState) =>
{
Assert.Same(expectedState, actualState);
Assert.NotEqual(0, span.Length); // shouldn't have been called for a zero-length span
for (int i = 0; i < span.Length; i++)
{
Assert.Equal(0, span[i]); // should've been zero-inited
span[i] = (byte)('a' + (i % 26)); // writes "abc...xyzabc...xyz..."
}
};
ArgumentException exception = Assert.Throws <ArgumentOutOfRangeException>(() => Utf8String.Create(-1, expectedState, spanAction));
Assert.Equal("length", exception.ParamName);
exception = Assert.Throws <ArgumentNullException>(() => Utf8String.Create(10, expectedState, action: null));
Assert.Equal("action", exception.ParamName);
Assert.Same(Utf8String.Empty, Utf8String.Create(0, expectedState, spanAction));
Assert.Equal(u8("abcde"), Utf8String.Create(5, expectedState, spanAction));
}
public static void Ctor_Validating_FromDelegate_ThrowsIfDelegateProvidesInvalidData()
{
SpanAction <byte, object> spanAction = (span, actualState) =>
{
span[0] = 0xFF; // never a valid UTF-8 byte
};
Assert.Throws <ArgumentException>(() => Utf8String.Create(10, new object(), spanAction));
}
private static unsafe Utf8String MakeStringFrom(ReadOnlySpan <byte> input, ref byte[] borrowedArray, bool isQueryString)
{
// If there are any %xx characters in the string, unescape them now.
int indexOfPercentChar = input.IndexOf((byte)'%');
if (indexOfPercentChar >= 0)
{
if (borrowedArray == null)
{
borrowedArray = ArrayPool <byte> .Shared.Rent(input.Length);
}
else if (borrowedArray.Length < input.Length)
{
ArrayPool <byte> .Shared.Return(borrowedArray);
borrowedArray = ArrayPool <byte> .Shared.Rent(input.Length);
}
ReadOnlySpan <byte> slicedInput = input;
int borrowedArrayOffset = 0;
do
{
// Copy everything up until the % character we saw
slicedInput.Slice(0, indexOfPercentChar).CopyTo(borrowedArray.AsSpan(borrowedArrayOffset));
slicedInput = slicedInput.Slice(indexOfPercentChar);
borrowedArrayOffset += indexOfPercentChar;
// Attempt percent-unescaping
int byteValue = PercentUnescape(slicedInput);
if (byteValue < 0)
{
// Not a valid %xx escape sequence - skip it
borrowedArray[borrowedArrayOffset++] = (byte)'%';
slicedInput = slicedInput.Slice(1);
}
else
{
Debug.Assert(byteValue <= byte.MaxValue);
borrowedArray[borrowedArrayOffset++] = (byte)byteValue;
slicedInput = slicedInput.Slice(3);
}
indexOfPercentChar = slicedInput.IndexOf((byte)'%'); // and search again
} while (indexOfPercentChar >= 0);
// If there's any leftover data, copy it now, then point the input span to the rented buffer
slicedInput.CopyTo(borrowedArray.AsSpan(borrowedArrayOffset));
input = borrowedArray.AsSpan(0, borrowedArrayOffset + slicedInput.Length);
}
if (isQueryString)
{
// Use pointers to smuggle the ref struct span across a closure
fixed(byte *pInput = input)
{
return(Utf8String.Create(input.Length, (IntPtr)pInput, (span, state) =>
{
new Span <byte>((byte *)state, span.Length).CopyTo(span);
// replace '+' with ' '
while (!span.IsEmpty)
{
int idxOfChar = span.IndexOf((byte)'+');
if (idxOfChar < 0)
{
break;
}
span[idxOfChar] = (byte)' ';
span = span.Slice(idxOfChar + 1);
}
}));
}
}
else
{
// no need to replace '+' with ' '
return(new Utf8String(input));
}
}
public StateProperty(string name) : this(name, Utf8String.Create(name))
{
}