diff options
Diffstat (limited to 'gr-digital/lib/additive_scrambler_bb_impl.cc')
| -rw-r--r-- | gr-digital/lib/additive_scrambler_bb_impl.cc | 41 |
1 files changed, 29 insertions, 12 deletions
diff --git a/gr-digital/lib/additive_scrambler_bb_impl.cc b/gr-digital/lib/additive_scrambler_bb_impl.cc index 58a2455aa5..d1112ee5f4 100644 --- a/gr-digital/lib/additive_scrambler_bb_impl.cc +++ b/gr-digital/lib/additive_scrambler_bb_impl.cc @@ -121,18 +121,35 @@ namespace gr { unsigned char *out = (unsigned char *)output_items[0]; int reset_index = _get_next_reset_index(noutput_items); - for(int i = 0; i < noutput_items; i++) { - unsigned char scramble_byte = 0x00; - for (int k = 0; k < d_bits_per_byte; k++) { - scramble_byte ^= (d_lfsr.next_bit() << k); - } - out[i] = in[i] ^ scramble_byte; - d_bytes++; - if (i == reset_index) { - d_lfsr.reset(); - d_bytes = 0; - reset_index = _get_next_reset_index(noutput_items, reset_index); - } + if (d_count >= 0) { + for(int i = 0; i < noutput_items; i++) { + unsigned char scramble_byte = 0x00; + for (int k = 0; k < d_bits_per_byte; k++) { + scramble_byte ^= (d_lfsr.next_bit() << k); + } + out[i] = in[i] ^ scramble_byte; + d_bytes++; + if (i == reset_index) { + d_lfsr.reset(); + d_bytes = 0; + reset_index = _get_next_reset_index(noutput_items, reset_index); + } + } + } else { + for(int i = 0; i < noutput_items; i++) { + // Reset should occur at/before the item associated with the tag. + if (i == reset_index) { + d_lfsr.reset(); + d_bytes = 0; + reset_index = _get_next_reset_index(noutput_items, reset_index); + } + unsigned char scramble_byte = 0x00; + for (int k = 0; k < d_bits_per_byte; k++) { + scramble_byte ^= (d_lfsr.next_bit() << k); + } + out[i] = in[i] ^ scramble_byte; + d_bytes++; + } } return noutput_items; |