iTextSharp.text.pdf.RandomAccessFileOrArray.Read C# (CSharp) Метод

        public int Read(byte[] b, int off, int len)
        {
            if (len == 0)
                return 0;
            int n = 0;
            if (isBack) {
                isBack = false;
                if (len == 1) {
                    b[off] = back;
                    return 1;
                }
                else {
                    n = 1;
                    b[off++] = back;
                    --len;
                }
            }
            if (arrayIn == null) {
                return rf.Read(b, off, len) + n;
            }
            else {
                if (arrayInPtr >= arrayIn.Length)
                    return -1;
                if (arrayInPtr + len > arrayIn.Length)
                    len = (int)(arrayIn.Length - arrayInPtr);
                Array.Copy(arrayIn, arrayInPtr, b, off, len);
                arrayInPtr += len;
                return len + n;
            }
        }

 virtual public void TestSeek()
 {
     RandomAccessFileOrArray rafoa = new RandomAccessFileOrArray(new RandomAccessSourceFactory().CreateSource(data));
     rafoa.Seek(72);
     for (int i = 72; i < data.Length; i++)
     {
         Assert.AreEqual(data[i], (byte)rafoa.Read());
     }
 }