public static int NeedsEscaping(ReadOnlySpan <char> value, JavaScriptEncoder encoder)
{
if (encoder != null)
{
return(encoder.FindFirstCharacterToEncodeUtf8(MemoryMarshal.Cast <char, byte>(value)));
}
int idx;
for (idx = 0; idx < value.Length; idx++)
{
if (NeedsEscaping(value[idx]))
{
goto Return;
}
}
idx = -1; // all characters allowed
Return:
return(idx);
}
public static int NeedsEscaping(ReadOnlySpan <byte> value, JavaScriptEncoder encoder)
{
int idx;
if (encoder != null)
{
idx = encoder.FindFirstCharacterToEncodeUtf8(value);
goto Return;
}
for (idx = 0; idx < value.Length; idx++)
{
if (NeedsEscaping(value[idx]))
{
goto Return;
}
}
idx = -1; // all characters allowed
Return:
return(idx);
}
public static unsafe int NeedsEscaping(ReadOnlySpan <byte> value, JavaScriptEncoder encoder)
{
fixed(byte *ptr = value)
{
int idx = 0;
if (encoder != null)
{
idx = encoder.FindFirstCharacterToEncodeUtf8(value);
goto Return;
}
#if BUILDING_INBOX_LIBRARY
if (Sse2.IsSupported)
{
sbyte *startingAddress = (sbyte *)ptr;
while (value.Length - 16 >= idx)
{
Debug.Assert(startingAddress >= ptr && startingAddress <= (ptr + value.Length - 16));
// Load the next 16 bytes.
Vector128 <sbyte> sourceValue = Sse2.LoadVector128(startingAddress);
// Check if any of the 16 bytes need to be escaped.
Vector128 <sbyte> mask = CreateEscapingMask(sourceValue);
int index = Sse2.MoveMask(mask.AsByte());
// If index == 0, that means none of the 16 bytes needed to be escaped.
// TrailingZeroCount is relatively expensive, avoid it if possible.
if (index != 0)
{
// Found at least one byte that needs to be escaped, figure out the index of
// the first one found that needed to be escaped within the 16 bytes.
Debug.Assert(index > 0 && index <= 65_535);
int tzc = BitOperations.TrailingZeroCount(index);
Debug.Assert(tzc >= 0 && tzc <= 16);
idx += tzc;
goto Return;
}
idx += 16;
startingAddress += 16;
}
// Process the remaining characters.
Debug.Assert(value.Length - idx < 16);
}
#endif
for (; idx < value.Length; idx++)
{
Debug.Assert((ptr + idx) <= (ptr + value.Length));
if (NeedsEscaping(*(ptr + idx)))
{
goto Return;
}
}
idx = -1; // all characters allowed
Return:
return(idx);
}
}