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https://github.com/lwvmobile/dsd-fme.git
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P25 Moto Talker Alias LCW WIP;
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lwvmobile
115
src/dsd_gps.c
115
src/dsd_gps.c
@@ -765,25 +765,26 @@ void apx_embedded_gps (dsd_opts * opts, dsd_state * state, uint8_t lc_bits[])
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fprintf (stderr, "%s", KNRM);
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}
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uint8_t alias_scramble[256] = {
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0xA8, 0xDF, 0x9E, 0x04, 0xF5, 0xF9, 0xEE, 0x1B, 0xAC, 0x3E, 0xE2, 0xAD, 0x71, 0xFC, 0x38, 0x03,
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0x59, 0xCE, 0xED, 0x82, 0xE1, 0xBD, 0x28, 0x86, 0x39, 0x78, 0x1C, 0xB7, 0xBA, 0xA3, 0x41, 0xD0,
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0x6D, 0x1F, 0x2F, 0xBB, 0x3D, 0x02, 0x3A, 0x20, 0x5F, 0x42, 0xC7, 0xA2, 0x70, 0x6E, 0x21, 0x7E,
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0x22, 0x90, 0xDB, 0xC8, 0xD7, 0x23, 0x85, 0xE0, 0xFB, 0x8D, 0x79, 0xEC, 0x33, 0xD6, 0xCC, 0x3C,
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0xA9, 0x24, 0x8F, 0x6C, 0x36, 0x25, 0x26, 0xBC, 0xFF, 0xEB, 0x34, 0xA1, 0x2D, 0x2E, 0x44, 0x48,
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0x45, 0xDD, 0x5E, 0x60, 0x9D, 0x99, 0xCB, 0x46, 0x8C, 0xBF, 0xDA, 0x47, 0x61, 0xD9, 0xD5, 0xD4,
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0xCA, 0xC3, 0xC2, 0x62, 0x63, 0x7A, 0x80, 0x64, 0x65, 0x98, 0xC1, 0x8B, 0x8A, 0x66, 0x7C, 0x7D,
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0x52, 0x76, 0x54, 0xAB, 0xE3, 0xC9, 0x14, 0xDE, 0x27, 0xDC, 0xF0, 0xE9, 0x77, 0x88, 0x31, 0xFD,
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0xB8, 0x4F, 0x4C, 0x58, 0xD1, 0x0F, 0x55, 0x13, 0xEA, 0x73, 0x6F, 0xFE, 0x7B, 0xE4, 0x74, 0xB5,
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0xA7, 0x87, 0xB1, 0x94, 0x07, 0x18, 0xF6, 0xB4, 0x4A, 0x12, 0xB3, 0x9B, 0xCF, 0x0C, 0x89, 0xC0,
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0xB2, 0xB6, 0xF7, 0x92, 0x53, 0x43, 0x81, 0x2B, 0xF2, 0x01, 0x15, 0x49, 0x40, 0x69, 0xE5, 0xD2,
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0xA4, 0xB0, 0x9C, 0x5B, 0x08, 0x68, 0x17, 0x1D, 0xD8, 0xA6, 0x84, 0xB9, 0x2C, 0xAA, 0x1E, 0x2A,
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0xA5, 0x57, 0x4E, 0x6B, 0x16, 0x75, 0x8E, 0x0D, 0x5C, 0x29, 0xAF, 0x5D, 0x9F, 0x6A, 0x11, 0x37,
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0x56, 0x09, 0x0B, 0x51, 0x30, 0x19, 0x93, 0xFA, 0x67, 0x1A, 0x35, 0x06, 0x7F, 0xC6, 0x05, 0x32,
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0xF3, 0x5A, 0x3F, 0x50, 0xF1, 0x4B, 0xCD, 0x00, 0x95, 0xE7, 0x96, 0x9A, 0xA0, 0x0E, 0xC5, 0xBE
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//relocate all below later on
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uint8_t alias_lut[256] = {
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0xD2, 0xF6, 0xD4, 0x2B, 0x63, 0x49, 0x94, 0x5E, 0xA7, 0x5C, 0x70, 0x69, 0xF7, 0x08, 0xB1, 0x7D,
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0x38, 0xCF, 0xCC, 0xD8, 0x51, 0x8F, 0xD5, 0x93, 0x6A, 0xF3, 0xEF, 0x7E, 0xFB, 0x64, 0xF4, 0x35,
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0x27, 0x07, 0x31, 0x14, 0x87, 0x98, 0x76, 0x34, 0xCA, 0x92, 0x33, 0x1B, 0x4F, 0x8C, 0x09, 0x40,
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0x32, 0x36, 0x77, 0x12, 0xD3, 0xC3, 0x01, 0xAB, 0x72, 0x81, 0x95, 0xC9, 0xC0, 0xE9, 0x65, 0x52,
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0x24, 0x30, 0x1C, 0xDB, 0x88, 0xE8, 0x97, 0x9D, 0x58, 0x26, 0x04, 0x39, 0xAC, 0x2A, 0x9E, 0xAA,
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0x25, 0xD7, 0xCE, 0xEB, 0x96, 0xF5, 0x0E, 0x8D, 0xDC, 0xA9, 0x2F, 0xDD, 0x1F, 0xEA, 0x91, 0xB7,
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0xD6, 0x89, 0x8B, 0xD1, 0xB0, 0x99, 0x13, 0x7A, 0xE7, 0x9A, 0xB5, 0x86, 0xFF, 0x46, 0x85, 0xB2,
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0x73, 0xDA, 0xBF, 0xD0, 0x71, 0xCB, 0x4D, 0x80, 0x15, 0x67, 0x16, 0x1A, 0x20, 0x8E, 0x45, 0x3E,
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0xF2, 0x2E, 0x66, 0x90, 0x74, 0x8A, 0x6F, 0x78, 0xBB, 0x53, 0x03, 0x11, 0x68, 0xCD, 0x44, 0x17,
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0x28, 0x5F, 0x1E, 0x84, 0x75, 0x79, 0x6E, 0x9B, 0x2C, 0xBE, 0x62, 0x2D, 0xF1, 0x7C, 0xB8, 0x83,
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0xD9, 0x4E, 0x6D, 0x02, 0x61, 0x3D, 0xA8, 0x06, 0xB9, 0xF8, 0x9C, 0x37, 0x3A, 0x23, 0xC1, 0x50,
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0xED, 0x9F, 0xAF, 0x3B, 0xBD, 0x82, 0xBA, 0xA0, 0xDF, 0xC2, 0x47, 0x22, 0xF0, 0xEE, 0xA1, 0xFE,
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0xA2, 0x10, 0x5B, 0x48, 0x57, 0xA3, 0x05, 0x60, 0x7B, 0x0D, 0xF9, 0x6C, 0xB3, 0x56, 0x4C, 0xBC,
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0x29, 0xA4, 0x0F, 0xEC, 0xB6, 0xA5, 0xA6, 0x3C, 0x7F, 0x6B, 0xB4, 0x21, 0xAD, 0xAE, 0xC4, 0xC8,
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0xC5, 0x5D, 0xDE, 0xE0, 0x1D, 0x19, 0x4B, 0xC6, 0x0C, 0x3F, 0x5A, 0xC7, 0xE1, 0x59, 0x55, 0x54,
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0x4A, 0x43, 0x42, 0xE2, 0xE3, 0xFA, 0x00, 0xE4, 0xE5, 0x18, 0x41, 0x0B, 0x0A, 0xE6, 0xFC, 0xFD
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};
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//relocate this later on
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void apx_embedded_alias_test (dsd_opts * opts, dsd_state * state)
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{
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uint64_t temp_a = 0x15900FE9060100B0; uint64_t temp_b = 0x5A; //72 bits, so break into segments
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@@ -914,25 +915,77 @@ void apx_embedded_alias_blocks (dsd_opts * opts, dsd_state * state, uint8_t slot
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uint16_t crc_cmp = ComputeCrcCCITT16d(&state->dmr_pdu_sf[slot][72], (bn*44)-16);
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//print comparison
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fprintf (stderr, " CRC EXT: %04X CMP: %04X;", crc_ext, crc_cmp);
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// fprintf (stderr, " CRC EXT: %04X CMP: %04X;", crc_ext, crc_cmp);
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if (crc_ext != crc_cmp)
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fprintf (stderr, " Error;");
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else fprintf (stderr, " Okay;");
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//debug, dump just the encoded alias portion
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fprintf (stderr, "\n Encoded: ");
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for (int16_t i = 32; i < ((bn*11)+18-4); i++) //double check on other bn values
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{
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// if ((i != 32) && ((i % 2) == 0))
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// fprintf (stderr, " ");
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fprintf (stderr, "%X", (uint8_t)ConvertBitIntoBytes(&state->dmr_pdu_sf[slot][0+(i*4)], 4));
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}
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fprintf (stderr, " CRC Error;");
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// else fprintf (stderr, " Okay;");
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//start decoding the alias
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if (crc_ext == crc_cmp)
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{
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//TODO: Figure this out
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// int16_t ptr = 128; //starting point of encoded data from test vectors
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//WIP: Working, needs more samples to verify various len values
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uint16_t ptr = 128; //starting point of encoded data from test vectors
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uint8_t encoded[200]; memset(encoded, 0, sizeof(encoded));
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uint8_t decoded[200]; memset(decoded, 0, sizeof(decoded));
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uint16_t num_bytes = ((44*bn) / 8) - 9; //substract 2 CRC and 7 FQSUID
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for (int16_t i = 0; i < num_bytes; i++)
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{
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encoded[i] = (uint8_t)ConvertBitIntoBytes(&state->dmr_pdu_sf[slot][ptr], 8);
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ptr += 8;
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}
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uint16_t accumulator = num_bytes;
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//Ilya's Voodoo Code
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for (int16_t i = 0; i < num_bytes; i++)
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{
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// Multiplication step 1
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uint16_t accum_mult = accumulator * 293 + 0x72E9;
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// Lookup table step
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uint8_t lut = alias_lut[encoded[i]];
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uint8_t mult1 = lut - (accum_mult >> 8);
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// Incrementing step
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uint8_t mult2 = 1;
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uint8_t shortstop = accum_mult | 0x1;
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uint8_t increment = shortstop << 1;
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while(mult2 != -1 && shortstop != 1)
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{
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shortstop += increment;
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mult2 += 2;
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}
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// Multiplication step 2
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decoded[i] = mult1 * mult2;
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// Update the accumulator
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accumulator += encoded[i] + 1;
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}
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// //debug, dump just the encoded alias portion
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// fprintf (stderr, "\n Encoded: ");
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// for (int16_t i = 0; i < bytes; i++)
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// fprintf (stderr, "%02X", encoded[i]);
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// //debug, dump the decoded payload as hex octets
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// fprintf (stderr, "\n Decoded: ");
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// for (int16_t i = 0; i < bytes; i++)
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// fprintf (stderr, "%02X", decoded[i]);
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//dump the decoded payload as long chars
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// fprintf (stderr, "\n");
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fprintf (stderr, " Alias: ");
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for (int16_t i = 0; i < num_bytes/2; i++)
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fprintf (stderr, "%lc", ((decoded[(i*2)+0])<<8) | ((decoded[(i*2)+1])<<0) );
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//For Ncurses Display (needs to be testing on real samples first to make sure this is setup right)
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// memcpy(state->dmr_embedded_gps[slot], decoded, bytes*sizeof(uint8_t));
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// state->dmr_embedded_gps[slot][199] = '\0'; //terminate string
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}
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//clear out now stale storage
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