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code reworked

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openapc 2012-12-29 19:37:03 +01:00
parent f48d7ab6a6
commit bf2dbe7494
26 changed files with 284 additions and 499 deletions
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29
backend/gridmtx.c
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@ -732,19 +732,18 @@ int gm_encode(int gbdata[], int length, char binary[], int reader)
void gm_add_ecc(char binary[], int data_posn, int layers, int ecc_level, int word[])
{
int total_cw, data_cw, i, j, wp;
int data_cw, i, j, wp;
int n1, b1, n2, b2, e1, b3, e2;
int block_size, data_size, ecc_size, toggle;
int block_size, data_size, ecc_size;
int data[1320], block[130];
unsigned char data_block[115], ecc_block[70];
total_cw = gm_total_cw[(layers - 1)];
data_cw = gm_data_codewords[((layers - 1) * 5) + (ecc_level - 1)];
for(i = 0; i < 1320; i++) {
data[i] = 0;
}
/* Convert from binary sream to 7-bit codewords */
for(i = 0; i < data_posn; i++) {
if(binary[i * 7] == '1') { data[i] += 0x40; }
@ -755,19 +754,17 @@ void gm_add_ecc(char binary[], int data_posn, int layers, int ecc_level, int wor
if(binary[(i * 7) + 5] == '1') { data[i] += 0x02; }
if(binary[(i * 7) + 6] == '1') { data[i] += 0x01; }
}
/* Add padding codewords */
data[data_posn] = 0x00;
for(i = (data_posn + 1); i < data_cw; i++) {
if(i & 1) {
data[i] = 0x7e;
toggle = 1;
} else {
data[i] = 0x00;
toggle = 0;
}
}
/* Get block sizes */
n1 = gm_n1[(layers - 1)];
b1 = gm_b1[(layers - 1)];
@ -776,27 +773,27 @@ void gm_add_ecc(char binary[], int data_posn, int layers, int ecc_level, int wor
e1 = gm_ebeb[((layers - 1) * 20) + ((ecc_level - 1) * 4)];
b3 = gm_ebeb[((layers - 1) * 20) + ((ecc_level - 1) * 4) + 1];
e2 = gm_ebeb[((layers - 1) * 20) + ((ecc_level - 1) * 4) + 2];
/* Split the data into blocks */
wp = 0;
for(i = 0; i < (b1 + b2); i++) {
if(i < b1) { block_size = n1; } else { block_size = n2; }
if(i < b3) { ecc_size = e1; } else { ecc_size = e2; }
data_size = block_size - ecc_size;
/* printf("block %d/%d: data %d / ecc %d\n", i + 1, (b1 + b2), data_size, ecc_size);*/
for(j = 0; j < data_size; j++) {
data_block[j] = data[wp];
wp++;
}
/* Calculate ECC data for this block */
rs_init_gf(0x89);
rs_init_code(ecc_size, 1);
rs_encode(data_size, data_block, ecc_block);
rs_free();
/* Correct error correction data but in reverse order */
for(j = 0; j < data_size; j++) {
block[j] = data_block[j];
@ -804,7 +801,7 @@ void gm_add_ecc(char binary[], int data_posn, int layers, int ecc_level, int wor
for(j = 0; j < ecc_size; j++) {
block[(j + data_size)] = ecc_block[ecc_size - j - 1];
}
for(j = 0; j < n2; j++) {
word[((b1 + b2) * j) + i] = block[j];
}