static void ChunkSubstring(Blob target, int start, ref int count, object chunk, out int chunkLength)
{
Debug.Assert(start >= 0);
Debug.Assert(count > 0);
AssertChunkObject(chunk);
switch (chunk)
{
case string str:
chunkLength = str.Length;
if (start < str.Length)
{
int append = Math.Min(str.Length - start, count);
target.AddChunk(str.Substring(start, append));
count -= append;
}
break;
case byte[] barr:
chunkLength = barr.Length;
if (start < barr.Length)
{
int append = Math.Min(barr.Length - start, count);
var newarr = new byte[append];
Array.Copy(barr, start, newarr, 0, append);
target.Add(newarr); // flags must be set
count -= append;
}
break;
case Blob b:
chunkLength = b.Length;
b.Substring(target, start, ref count);
break;
case char[] carr:
chunkLength = carr.Length;
if (start < carr.Length)
{
int append = Math.Min(carr.Length - start, count);
var newarr = new char[append];
Array.Copy(carr, start, newarr, 0, append);
target.Add(newarr); // flags must be set
count -= append;
}
break;
case BlobChar[] barr:
chunkLength = barr.Length;
if (start < barr.Length)
{
int append = Math.Min(barr.Length - start, count);
var newarr = new BlobChar[append];
Array.Copy(barr, start, newarr, 0, append);
target.Add(newarr); // flags must be set
count -= append;
}
break;
default:
throw new ArgumentException(chunk.GetType().ToString());
}
}