public static bool IsText(IByteBuffer buf, int index, int length, Encoding encoding)
{
if (buf is null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.buf);
}
if (encoding is null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.encoding);
}
int maxIndex = buf.ReaderIndex + buf.ReadableBytes;
if (index < 0 || length < 0 || index > maxIndex - length)
{
ThrowHelper.ThrowIndexOutOfRangeException_IsText(index, length);
}
switch (encoding.CodePage)
{
case TextEncodings.UTF8CodePage:
return(IsUtf8(buf, index, length));
case TextEncodings.ASCIICodePage:
return(IsAscii(buf, index, length));
default:
try
{
if (buf.IsSingleIoBuffer)
{
ArraySegment <byte> segment = buf.GetIoBuffer();
_ = encoding.GetChars(segment.Array, segment.Offset, segment.Count);
}
else
{
IByteBuffer heapBuffer = buf.Allocator.HeapBuffer(length);
try
{
_ = heapBuffer.WriteBytes(buf, index, length);
ArraySegment <byte> segment = heapBuffer.GetIoBuffer();
_ = encoding.GetChars(segment.Array, segment.Offset, segment.Count);
}
finally
{
_ = heapBuffer.Release();
}
}
return(true);
}
catch
{
return(false);
}
}
}
