public override Slice Skip(ushort bytesToSkip)
{
if (Header.PrefixId == NonPrefixedId)
{
return(NonPrefixedData.Skip(bytesToSkip));
}
if (bytesToSkip == Header.PrefixUsage)
{
return(NonPrefixedData);
}
if (bytesToSkip > Header.PrefixUsage)
{
return(NonPrefixedData.Skip((ushort)(bytesToSkip - Header.PrefixUsage)));
}
// bytesToSkip < _header.PrefixUsage
Debug.Assert(Prefix != null);
var prefixPart = Header.PrefixUsage - bytesToSkip;
var sliceSize = prefixPart + Header.NonPrefixedDataSize;
var sliceData = new byte[sliceSize];
fixed(byte *slicePtr = sliceData)
{
if (Prefix.Value == null)
{
NativeMethods.memcpy(slicePtr, Prefix.ValuePtr + bytesToSkip, prefixPart);
}
else
{
fixed(byte *prefixVal = Prefix.Value)
NativeMethods.memcpy(slicePtr, prefixVal + bytesToSkip, prefixPart);
}
}
NonPrefixedData.CopyTo(0, sliceData, prefixPart, sliceSize - prefixPart);
return(new Slice(sliceData));
}
