kks table csum

            byte[] buf = new byte[jsonbuf.Length + 5];
            Array.Copy(jsonbuf, 0, buf, 4, jsonbuf.Length);
            buf[buf.Length - 1] = 0;
            xor2(buf, 0x39, 0x03);
            /* ---------------------
             @ eax 0001597B json len +pad?
             * ebx 323EEC68 json buf
             @ ecx 811C9DC5 seed
             * edx 323EEC68 json buf
             * esi 00015971 json len -csum -nul
             * edi 323EEC68 json buf
             * ebp 003EF22C ? 10 f7 3e 00
             * esp 003EF0CC ? eb 48 3f c3
             * eip 017654D0 TabFlow+2A0
             * efl 00000206 ?
             * ---ODITSZAPC
             * ---001000010
             * ---------------------
             * #1  imul ecx, 1000193h
             * #2  movsx eax, al
             * #3  inc edi
             * #4  xor ecx, eax
             * #5  mov al, [edi]
             * #6  test al, al
             * #7  jnz short 17354d0h   #1
             * ----LOOP----
             * #8  cmp ecx, [ebp+var_124]
             * #9  jz valid_file
             * ---------------------
             * 811C9DC5 *=1000193
             * 050C5D1F ^=eax(7b)
             * 050C5D64
             * ---------------------
             * 050C5D64 *=1000193
             * 5677046C ^=eax(22)
             * 5677044E
             * 5677044E 6B5BC6CA 6B5BC6BE
             * 6B5BC6BE BF79DD1A BF79DD45
             * ---------------------
             * 7b 22 74 5f 63 61 73
             *  "  t  _  c  a  s  t
             */

            UInt32 len = (UInt32)(jsonbuf.Length + 0xB);
            byte eax = BitConverter.GetBytes(len)[0];
            eax = 0x7b;
            UInt32 ecx = 0x811C9DC5;
            byte[] csum = new byte[4];
            for (int edi = 4; edi < buf.Length; )
            {
                ecx *= 0x1000193;
                csum = BitConverter.GetBytes(ecx);
                csum[0] ^= BitConverter.GetBytes(eax)[0];
                if (eax >= 0x80) for (int a = 1; a < csum.Length; a++) csum[a] ^= 0xFF;
                ecx = BitConverter.ToUInt32(csum, 0);
                eax = (byte)(buf[++edi] ^ (edi % 2 == 0 ? 0x39 : 0x03));
                if (eax == 0) break;
            }
            //MessageBox.Show(ecx.ToString("x"));
            csum = BitConverter.GetBytes(ecx);
            Array.Copy(csum, buf, csum.Length);
            File.WriteAllBytes(fout, buf);