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Dedupe error correction code in Aztec

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Robin Stuart 2017-08-06 09:10:00 +01:00
parent 2da42d1733
commit 1f503f2aca
1 changed files with 16 additions and 77 deletions
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93
backend/aztec.c
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@ -1338,98 +1338,37 @@ int aztec(struct zint_symbol *symbol, unsigned char source[], const size_t lengt
memset(data_part, 0, (data_blocks + 2) * sizeof (int)); memset(data_part, 0, (data_blocks + 2) * sizeof (int));
memset(ecc_part, 0, (ecc_blocks + 2) * sizeof (int)); memset(ecc_part, 0, (ecc_blocks + 2) * sizeof (int));
/* Split into codewords and calculate reed-colomon error correction codes */ /* Split into codewords and calculate reed-solomon error correction codes */
for (i = 0; i < data_blocks; i++) {
for (p = 0; p < codeword_size; p++) {
if (adjusted_string[i * codeword_size + p] == '1') {
data_part[i] += 0x01 << (codeword_size - (p + 1));
}
}
}
switch (codeword_size) { switch (codeword_size) {
case 6: case 6:
for (i = 0; i < data_blocks; i++) {
for (p = 0; p < 6; p++) {
if (adjusted_string[i * codeword_size + p] == '1') {
data_part[i] += (0x20 >> p);
}
}
}
rs_init_gf(0x43); rs_init_gf(0x43);
rs_init_code(ecc_blocks, 1);
rs_encode_long(data_blocks, data_part, ecc_part);
for (i = (ecc_blocks - 1); i >= 0; i--) {
for (p = 0; p < 6; p++) {
if (ecc_part[i] & (0x20 >> p)) {
strcat(adjusted_string, "1");
} else {
strcat(adjusted_string, "0");
}
}
}
rs_free();
break; break;
case 8: case 8:
for (i = 0; i < data_blocks; i++) {
for (p = 0; p < 8; p++) {
if (adjusted_string[i * codeword_size + p] == '1') {
data_part[i] += (0x80 >> p);
}
}
}
rs_init_gf(0x12d); rs_init_gf(0x12d);
rs_init_code(ecc_blocks, 1);
rs_encode_long(data_blocks, data_part, ecc_part);
for (i = (ecc_blocks - 1); i >= 0; i--) {
for (p = 0; p < 8; p++) {
if (ecc_part[i] & (0x80 >> p)) {
strcat(adjusted_string, "1");
} else {
strcat(adjusted_string, "0");
}
}
}
rs_free();
break; break;
case 10: case 10:
for (i = 0; i < data_blocks; i++) {
for (p = 0; p < 10; p++) {
if (adjusted_string[i * codeword_size + p] == '1') {
data_part[i] += (0x200 >> p);
}
}
}
rs_init_gf(0x409); rs_init_gf(0x409);
rs_init_code(ecc_blocks, 1);
rs_encode_long(data_blocks, data_part, ecc_part);
for (i = (ecc_blocks - 1); i >= 0; i--) {
for (p = 0; p < 10; p++) {
if (ecc_part[i] & (0x200 >> p)) {
strcat(adjusted_string, "1");
} else {
strcat(adjusted_string, "0");
}
}
}
rs_free();
break; break;
case 12: case 12:
for (i = 0; i < data_blocks; i++) {
for (p = 0; p < 12; p++) {
if (adjusted_string[i * codeword_size + p] == '1') {
data_part[i] += (0x800 >> p);
}
}
}
rs_init_gf(0x1069); rs_init_gf(0x1069);
rs_init_code(ecc_blocks, 1);
rs_encode_long(data_blocks, data_part, ecc_part);
for (i = (ecc_blocks - 1); i >= 0; i--) {
for (p = 0; p < 12; p++) {
if (ecc_part[i] & (0x800 >> p)) {
strcat(adjusted_string, "1");
} else {
strcat(adjusted_string, "0");
}
}
}
rs_free();
break; break;
} }
rs_init_code(ecc_blocks, 1);
rs_encode_long(data_blocks, data_part, ecc_part);
for (i = (ecc_blocks - 1); i >= 0; i--) {
bin_append(ecc_part[i], codeword_size, adjusted_string);
}
rs_free();
/* Invert the data so that actual data is on the outside and reed-solomon on the inside */ /* Invert the data so that actual data is on the outside and reed-solomon on the inside */
memset(bit_pattern, '0', 20045); memset(bit_pattern, '0', 20045);