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Improved pad character handling routine

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Bugfix and code by Milton Neil <miltonneal@bigpond.com>
This commit is contained in:
Robin Stuart 2017-02-18 22:17:49 +00:00
parent 81cadc3cf9
commit 6a69e97dfe
1 changed files with 53 additions and 37 deletions
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72
backend/dotcode.c
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@ -352,7 +352,7 @@ int ahead_b(const unsigned char source[], int position, int length) {
}
/* checks if the next character is in the range 128 to 255 (Annex F.II.I) */
int binary(const unsigned char source[], int position, int length) {
int binary(const unsigned char source[], int position) {
int retval = 0;
if (source[position] >= 128) {
@ -521,7 +521,7 @@ int dotcode_encode_message(struct zint_symbol *symbol, const unsigned char sourc
/* Setp B3 */
if ((!done) && (encoding_mode == 'C')) {
if (binary(source, input_position, length)) {
if (binary(source, input_position)) {
if (n_digits(source, input_position + 1, length) > 0) {
if ((source[input_position] - 128) < 32) {
codeword_array[array_length] = 110; // Bin Shift A
@ -627,7 +627,7 @@ int dotcode_encode_message(struct zint_symbol *symbol, const unsigned char sourc
/* Step C3 */
if ((!done) && (encoding_mode == 'B')) {
if (binary(source, input_position, length)) {
if (binary(source, input_position)) {
if (datum_b(source, input_position + 1, length)) {
if ((source[input_position] - 128) < 32) {
codeword_array[array_length] = 110; // Bin Shift A
@ -729,7 +729,7 @@ int dotcode_encode_message(struct zint_symbol *symbol, const unsigned char sourc
/* Step D3 */
if ((!done) && (encoding_mode == 'A')) {
if (binary(source, input_position, length)) {
if (binary(source, input_position)) {
if (datum_a(source, input_position + 1, length)) {
if ((source[input_position] - 128) < 32) {
codeword_array[array_length] = 110; // Bin Shift A
@ -822,10 +822,10 @@ int dotcode_encode_message(struct zint_symbol *symbol, const unsigned char sourc
* base 103 into five base 259 values..."
*/
if ((!done) && (encoding_mode == 'X')) {
if (binary(source, input_position, length)
|| binary(source, input_position + 1, length)
|| binary(source, input_position + 2, length)
|| binary(source, input_position + 3, length)) {
if (binary(source, input_position)
|| binary(source, input_position + 1)
|| binary(source, input_position + 2)
|| binary(source, input_position + 3)) {
binary_buffer *= 259;
binary_buffer += source[input_position];
binary_buffer_size++;
@ -1044,22 +1044,21 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
size_t jc;
int data_length, ecc_length;
int min_dots, n_dots, min_area;
int height, width, pad_chars;
int height, width;
int mask_score[4];
int weight;
size_t dot_stream_length;
int high_score, best_mask;
int binary_finish = 0;
int debug = 0;
int padding_dots, is_first;
#ifndef _MSC_VER
unsigned char codeword_array[length * 3];
unsigned char masked_codeword_array[length * 3];
#else
char* dot_stream;
char* dot_array;
unsigned char* codeword_array = (unsigned char *) _alloca(length * 3 * sizeof (unsigned char));
unsigned char* masked_codeword_array = (unsigned char *) _alloca(length * 3 * sizeof (unsigned char));
#endif /* _MSC_VER */
data_length = dotcode_encode_message(symbol, source, length, codeword_array, &binary_finish);
@ -1078,33 +1077,33 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
/* Following Rule 3 (Section 5.2.2) and applying a recommended width to height ratio 3:2 */
/* Eliminates under sized symbols */
float h = (float)(sqrt(min_area * 0.666));
float w = (float)(sqrt(min_area * 1.5));
float h = (float) (sqrt(min_area * 0.666));
float w = (float) (sqrt(min_area * 1.5));
height = (int) h;
width = (int) w;
if ((width + height) % 2 == 1){
if ((width * height) < min_area){
if ((width + height) % 2 == 1) {
if ((width * height) < min_area) {
width++;
height++;
}
} else {
if ((h * width) < (w * height)){
if ((h * width) < (w * height)) {
width++;
if ((width * height) < min_area){
if ((width * height) < min_area) {
width--;
height++;
if ((width * height) < min_area){
if ((width * height) < min_area) {
width += 2;
}
}
} else {
height++;
if ((width * height) < min_area){
if ((width * height) < min_area) {
width++;
height--;
if ((width * height) < min_area){
if ((width * height) < min_area) {
height += 2;
}
}
@ -1142,21 +1141,38 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
#endif
/* Add pad characters */
for (pad_chars = 0; 9 * ((data_length + pad_chars + 3 + ((data_length + pad_chars) / 2)) + 2) < n_dots; pad_chars++);
padding_dots = n_dots - min_dots; /* get the number of free dots available for padding */
is_first = 1; /* first padding character flag */
if ((pad_chars > 0) && (binary_finish == 1)) {
codeword_array[data_length] = 109; // Latch to Code Set A
data_length++;
pad_chars--;
}
while (padding_dots >= 9) {
if (padding_dots < 18 && ((data_length % 2) == 0))
padding_dots -= 9;
else if (padding_dots >= 18) {
if ((data_length % 2) == 0)
padding_dots -= 9;
else
padding_dots -= 18;
} else
break; /* not enough padding dots left for padding */
if ((is_first == 1) && (binary_finish == 1))
codeword_array[data_length] = 109;
else
codeword_array[data_length] = 106;
for (i = 0; i < pad_chars; i++) {
codeword_array[data_length] = 106; // Pad
data_length++;
is_first = 0;
}
ecc_length = 3 + (data_length / 2);
#ifndef _MSC_VER
unsigned char masked_codeword_array[data_length + 1 + ecc_length];
#else
unsigned char* masked_codeword_array = (unsigned char *) _alloca((data_length + 1 + ecc_length) * sizeof (unsigned char));
#endif /* _MSC_VER */
/* Evaluate data mask options */
for (i = 0; i < 4; i++) {
switch (i) {