mirrors/zint-barcode-generator
1
0
Fork 0
mirror of https://git.code.sf.net/p/zint/code synced 2025-05-20 18:25:12 -04:00
Code Issues Projects Releases Packages Wiki Activity

Han Xin: Add error correction and codeword interlace

Browse source
This commit is contained in:
Robin Stuart 2016-04-16 12:57:45 +01:00
parent 7831bda722
commit fd0f041f19
2 changed files with 430 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

93
backend/hanxin.c
View file

@ -628,6 +628,59 @@ void hx_setup_grid(unsigned char* grid, int size, int version) {
}
}
/* Calculate error correction codes */
void hx_add_ecc(unsigned char fullstream[], unsigned char datastream[], int version, int ecc_level) {
unsigned char data_block[180];
unsigned char ecc_block[36];
//FIXME: Check that this is the correct method for assembling the data
int i, j, block;
int batch_size, data_length, ecc_length;
int input_position = -1;
int output_position = -1;
for (i = 0; i < 3; i++) {
batch_size = hx_table_d1[(((version - 1) + (ecc_level - 1)) * 9) + (3 * i)];
data_length = hx_table_d1[(((version - 1) + (ecc_level - 1)) * 9) + (3 * i) + 1];
ecc_length = hx_table_d1[(((version - 1) + (ecc_level - 1)) * 9) + (3 * i) + 2];
for(block = 0; block < batch_size; block++) {
for (j = 0; j < data_length; j++) {
input_position++;
output_position++;
data_block[j] = datastream[input_position];
fullstream[output_position] = datastream[input_position];
}
rs_init_gf(0x163); // x^8 + x^6 + x^5 + x + 1 = 0
rs_init_code(ecc_length, 1);
rs_encode(data_length, data_block, ecc_block);
rs_free();
for (j = 0; j < ecc_length; j++) {
output_position++;
fullstream[output_position] = ecc_block[ecc_length - j - 1];
}
}
}
}
/* Rearrange data in batches of 13 codewords (section 5.8.2) */
void make_picket_fence(unsigned char fullstream[], unsigned char picket_fence[], int streamsize) {
int i, start;
int output_position = 0;
for (start = 0; start < 13; start++) {
for (i = start; i < streamsize; i += 13) {
if (i < streamsize) {
picket_fence[output_position] = fullstream[i];
output_position++;
}
}
}
}
/* Han Xin Code - main */
int han_xin(struct zint_symbol *symbol, const unsigned char source[], int length) {
char mode[length + 1];
@ -690,17 +743,19 @@ int han_xin(struct zint_symbol *symbol, const unsigned char source[], int length
}
size = (version * 2) + 21;
#ifndef _MSC_VER
int datastream[data_codewords];
int fullstream[hx_total_codewords[version - 1]];
unsigned char datastream[data_codewords];
unsigned char fullstream[hx_total_codewords[version - 1]];
unsigned char picket_fence[hx_total_codewords[version - 1]];
unsigned char grid[size * size];
#else
datastream = (int *) _alloca((data_codewords) * sizeof (int));
fullstream = (int *) _alloca((hx_total_codewords[version - 1]) * sizeof (int));
datastream = (unsigned char *) _alloca((data_codewords) * sizeof (unsigned char));
fullstream = (unsigned char *) _alloca((hx_total_codewords[version - 1]) * sizeof (unsigned char));
picket_fence = (unsigned char *) _alloca((hx_total_codewords[version - 1]) * sizeof (unsigned char));
grid = (unsigned char *) _alloca((size * size) * sizeof (unsigned char));
#endif
for (i = 0; i < data_codewords; i++) {
datastream[i] = 0;
}
@ -710,9 +765,9 @@ int han_xin(struct zint_symbol *symbol, const unsigned char source[], int length
datastream[i / 8] += 0x80 >> (i % 8);
}
}
hx_setup_grid(grid, size, version);
printf("Binary: %s\n", binary);
printf("Data Codewords:\n");
@ -721,6 +776,24 @@ int han_xin(struct zint_symbol *symbol, const unsigned char source[], int length
}
printf("\n");
hx_add_ecc(fullstream, datastream, version, ecc_level);
printf("Full stream, including ecc:\n");
for (i = 0; i < hx_total_codewords[version - 1]; i++) {
printf("%2X ", fullstream[i]);
}
printf("\n");
make_picket_fence(fullstream, picket_fence, hx_total_codewords[version - 1]);
printf("Picket fence:\n");
for (i = 0; i < hx_total_codewords[version - 1]; i++) {
printf("%2X ", picket_fence[i]);
}
printf("\n");
printf("Version %d, ECC level %d\n", version, ecc_level);
symbol->width = size;
symbol->rows = size;
@ -732,6 +805,6 @@ int han_xin(struct zint_symbol *symbol, const unsigned char source[], int length
}
symbol->row_height[i] = 1;
}
return 0;
return 1;
}