mirror of
https://github.com/zint/zint
synced 2024-11-16 20:57:25 +13:00
PDF417 enhancements:
- Switched mode selection to better optimized method listed in Appendix D of the AIM PDF417 specification. - Removed extraneous text latch after a byte shift. - Removed invalid numeric->byte shift transitions.
This commit is contained in:
Jeff Skaistis
parent
c0ec67f99e
commit
e8a125a2e1
@ -328,7 +328,7 @@ static void cc_b(struct zint_symbol *symbol, const char source[], const int cc_w
|
||||
chainemc[mclength] = 920;
|
||||
mclength++;
|
||||
|
||||
pdf_byteprocess(chainemc, &mclength, data_string, 0, length, debug_print);
|
||||
pdf_byteprocess(chainemc, &mclength, data_string, 0, length, 0, debug_print);
|
||||
|
||||
/* Now figure out which variant of the symbol to use and load values accordingly */
|
||||
|
||||
@ -547,7 +547,7 @@ static void cc_c(struct zint_symbol *symbol, const char source[], const int cc_w
|
||||
chainemc[mclength] = 920; /* CC-C identifier */
|
||||
mclength++;
|
||||
|
||||
pdf_byteprocess(chainemc, &mclength, data_string, 0, length, debug_print);
|
||||
pdf_byteprocess(chainemc, &mclength, data_string, 0, length, 0, debug_print);
|
||||
|
||||
chainemc[0] = mclength;
|
||||
|
||||
|
||||
253
backend/pdf417.c
253
backend/pdf417.c
@ -106,127 +106,100 @@ static int pdf_quelmode(const unsigned char codeascii) {
|
||||
return BYT;
|
||||
}
|
||||
|
||||
/* 844 */
|
||||
static void pdf_regroupe(int liste[2][PDF_MAX_LEN], int *indexliste) {
|
||||
static int pdf_text_num_length(int liste[2][PDF_MAX_LEN], int* indexliste, const int start)
|
||||
{
|
||||
/* check consecutive segments for text/num and return the length */
|
||||
int i, len = 0;
|
||||
for (i = start; i < *(indexliste); i++) {
|
||||
if (liste[1][i] == BYT)
|
||||
break;
|
||||
|
||||
len += liste[0][i];
|
||||
if (len >= 5) /* we don't care if it's longer than 5 */
|
||||
break;
|
||||
}
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
/* Pack segments using the method described in Appendix D of the AIM specification */
|
||||
static void pdf_appendix_d_encode(int liste[2][PDF_MAX_LEN], int* indexliste, const int debug_print) {
|
||||
int i = 0, next, last = 0, stayintext = 0;
|
||||
|
||||
/* bring together same type blocks */
|
||||
if (*(indexliste) > 1) {
|
||||
int i = 1;
|
||||
while (i < *(indexliste)) {
|
||||
if (liste[1][i - 1] == liste[1][i]) {
|
||||
int j;
|
||||
/* bring together */
|
||||
liste[0][i - 1] = liste[0][i - 1] + liste[0][i];
|
||||
j = i + 1;
|
||||
if (debug_print) {
|
||||
printf("Encoding block %d = %d (%d)\n", i, liste[1][i], liste[0][i]);
|
||||
}
|
||||
|
||||
/* decrease the list */
|
||||
while (j < *(indexliste)) {
|
||||
liste[0][j - 1] = liste[0][j];
|
||||
liste[1][j - 1] = liste[1][j];
|
||||
j++;
|
||||
if ((liste[1][i] == NUM) && (liste[0][i] >= 13)) {
|
||||
/* leave as numeric */
|
||||
liste[0][last] = liste[0][i];
|
||||
liste[1][last] = NUM;
|
||||
stayintext = 0;
|
||||
last++;
|
||||
} else if (((liste[1][i] == TEX) || (liste[1][i] == NUM)) &&
|
||||
(stayintext || (liste[0][i] >= 5) || (pdf_text_num_length(liste, indexliste, i) >= 5))) {
|
||||
/* set to text and combine additional text/short numeric segments */
|
||||
liste[0][last] = liste[0][i];
|
||||
liste[1][last] = TEX;
|
||||
stayintext = 0;
|
||||
|
||||
next = i + 1;
|
||||
while (next < *(indexliste)) {
|
||||
if ((liste[1][next] == NUM) && (liste[0][next] >= 13)) {
|
||||
break;
|
||||
}
|
||||
*(indexliste) = *(indexliste) - 1;
|
||||
i--;
|
||||
else if (liste[1][next] == BYT) {
|
||||
break;
|
||||
}
|
||||
|
||||
liste[0][last] += liste[0][next];
|
||||
next++;
|
||||
}
|
||||
|
||||
last++;
|
||||
i = next;
|
||||
continue;
|
||||
} else {
|
||||
/* build byte segment, including combining numeric/text segments that aren't long enough on their own */
|
||||
liste[0][last] = liste[0][i];
|
||||
liste[1][last] = BYT;
|
||||
stayintext = 0;
|
||||
|
||||
next = i + 1;
|
||||
while (next < *(indexliste)) {
|
||||
if (liste[1][next] != BYT) {
|
||||
/* check for case of a single byte shift from text mode */
|
||||
if ((liste[0][last] == 1) && (last > 0) && (liste[1][last - 1] == TEX)) {
|
||||
stayintext = 1;
|
||||
break;
|
||||
}
|
||||
|
||||
if ((liste[0][next] >= 5) || (pdf_text_num_length(liste, indexliste, next) >= 5)) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
liste[0][last] += liste[0][next];
|
||||
next++;
|
||||
}
|
||||
|
||||
last++;
|
||||
i = next;
|
||||
continue;
|
||||
}
|
||||
|
||||
i++;
|
||||
}
|
||||
}
|
||||
/* 865 */
|
||||
}
|
||||
|
||||
/* 478 */
|
||||
static void pdf_smooth(int liste[2][PDF_MAX_LEN], int *indexliste) {
|
||||
int i, crnt, last, next, length;
|
||||
|
||||
for (i = 0; i < *(indexliste); i++) {
|
||||
crnt = liste[1][i];
|
||||
length = liste[0][i];
|
||||
if (i != 0) {
|
||||
last = liste[1][i - 1];
|
||||
} else {
|
||||
last = 0;
|
||||
}
|
||||
if (i != *(indexliste) - 1) {
|
||||
next = liste[1][i + 1];
|
||||
} else {
|
||||
next = 0;
|
||||
}
|
||||
|
||||
if (crnt == NUM) {
|
||||
if (i == 0) {
|
||||
/* first block */
|
||||
if (*(indexliste) > 1) {
|
||||
/* and there are others */
|
||||
if ((next == TEX) && (length < 8)) {
|
||||
liste[1][i] = TEX;
|
||||
} else if ((next == BYT) && (length == 1)) {
|
||||
liste[1][i] = BYT;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if (i == *(indexliste) - 1) {
|
||||
/* last block */
|
||||
if ((last == TEX) && (length < 7)) {
|
||||
liste[1][i] = TEX;
|
||||
} else if ((last == BYT) && (length == 1)) {
|
||||
liste[1][i] = BYT;
|
||||
}
|
||||
} else {
|
||||
/* not first or last block */
|
||||
if (((last == BYT) && (next == BYT)) && (length < 4)) {
|
||||
liste[1][i] = BYT;
|
||||
} else if (((last == BYT) && (next == TEX)) && (length < 4)) {
|
||||
liste[1][i] = TEX;
|
||||
} else if (((last == TEX) && (next == BYT)) && (length < 5)) {
|
||||
liste[1][i] = TEX;
|
||||
} else if (((last == TEX) && (next == TEX)) && (length < 8)) {
|
||||
liste[1][i] = TEX;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
pdf_regroupe(liste, indexliste);
|
||||
/* 520 */
|
||||
for (i = 0; i < *(indexliste); i++) {
|
||||
crnt = liste[1][i];
|
||||
length = liste[0][i];
|
||||
if (i != 0) {
|
||||
last = liste[1][i - 1];
|
||||
} else {
|
||||
last = 0;
|
||||
}
|
||||
if (i != *(indexliste) - 1) {
|
||||
next = liste[1][i + 1];
|
||||
} else {
|
||||
next = 0;
|
||||
}
|
||||
|
||||
if ((crnt == TEX) && (i > 0)) {
|
||||
/* not the first */
|
||||
if (i == *(indexliste) - 1) {
|
||||
/* the last one */
|
||||
if ((last == BYT) && (length == 1)) {
|
||||
liste[1][i] = BYT;
|
||||
}
|
||||
} else {
|
||||
/* not the last one */
|
||||
if (((last == BYT) && (next == BYT)) && (length < 5)) {
|
||||
liste[1][i] = BYT;
|
||||
} else if ((((last == BYT) && (next != BYT)) || ((last != BYT) && (next == BYT))) && (length < 3)) {
|
||||
liste[1][i] = BYT;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
/* 540 */
|
||||
pdf_regroupe(liste, indexliste);
|
||||
/* set the size of the list based on the last consolidated segment */
|
||||
*indexliste = last;
|
||||
}
|
||||
|
||||
/* 547 */
|
||||
static void pdf_textprocess(int *chainemc, int *mclength, const unsigned char chaine[], int start, const int length,
|
||||
const int is_micro) {
|
||||
int j, indexlistet, curtable, listet[2][PDF_MAX_LEN] = {{0}}, chainet[PDF_MAX_LEN], wnet;
|
||||
const int lastmode, int *curtable) {
|
||||
int j, indexlistet, listet[2][PDF_MAX_LEN] = {{0}}, chainet[PDF_MAX_LEN], wnet;
|
||||
|
||||
wnet = 0;
|
||||
|
||||
@ -238,9 +211,12 @@ static void pdf_textprocess(int *chainemc, int *mclength, const unsigned char ch
|
||||
}
|
||||
|
||||
/* 570 */
|
||||
curtable = 1; /* default table */
|
||||
if (lastmode != TEX) {
|
||||
*curtable = 1; /* set default table upper alpha */
|
||||
}
|
||||
|
||||
for (j = 0; j < length; j++) {
|
||||
if (listet[0][j] & curtable) {
|
||||
if (listet[0][j] & *curtable) {
|
||||
/* The character is in the current table */
|
||||
chainet[wnet++] = listet[1][j];
|
||||
} else {
|
||||
@ -248,7 +224,7 @@ static void pdf_textprocess(int *chainemc, int *mclength, const unsigned char ch
|
||||
int newtable;
|
||||
if (j == (length - 1) || !(listet[0][j] & listet[0][j + 1])) {
|
||||
/* we change only one character - look for temporary switch */
|
||||
if ((listet[0][j] & 1) && (curtable == 2)) { /* T_UPP */
|
||||
if ((listet[0][j] & 1) && (*curtable == 2)) { /* T_UPP */
|
||||
chainet[wnet++] = 27;
|
||||
chainet[wnet++] = listet[1][j];
|
||||
continue;
|
||||
@ -274,7 +250,7 @@ static void pdf_textprocess(int *chainemc, int *mclength, const unsigned char ch
|
||||
}
|
||||
|
||||
/* 619 - select the switch */
|
||||
switch (curtable) {
|
||||
switch (*curtable) {
|
||||
case 1:
|
||||
switch (newtable) {
|
||||
case 2: chainet[wnet++] = 27;
|
||||
@ -321,7 +297,7 @@ static void pdf_textprocess(int *chainemc, int *mclength, const unsigned char ch
|
||||
}
|
||||
break;
|
||||
}
|
||||
curtable = newtable;
|
||||
*curtable = newtable;
|
||||
/* 659 - at last we add the character */
|
||||
chainet[wnet++] = listet[1][j];
|
||||
}
|
||||
@ -333,9 +309,8 @@ static void pdf_textprocess(int *chainemc, int *mclength, const unsigned char ch
|
||||
}
|
||||
/* Now translate the string chainet into codewords */
|
||||
|
||||
/* Default mode for PDF417 is Text Compaction Alpha (ISO/IEC 1543:2015 5.4.2.1), and for MICROPDF417 is Byte
|
||||
* Compaction (ISO/IEC 24728:2006 5.4.3), so only add flag if not first codeword or is MICROPDF417 */
|
||||
if (*mclength > 1 || is_micro) {
|
||||
/* add mode indicator if needed */
|
||||
if (lastmode != TEX) {
|
||||
chainemc[(*mclength)++] = 900;
|
||||
}
|
||||
|
||||
@ -347,15 +322,16 @@ static void pdf_textprocess(int *chainemc, int *mclength, const unsigned char ch
|
||||
|
||||
/* 671 */
|
||||
INTERNAL void pdf_byteprocess(int *chainemc, int *mclength, const unsigned char chaine[], int start, const int length,
|
||||
const int debug_print) {
|
||||
const int lastmode, const int debug_print) {
|
||||
|
||||
if (debug_print) printf("\nEntering byte mode at position %d\n", start);
|
||||
|
||||
if (length == 1) {
|
||||
chainemc[(*mclength)++] = 913;
|
||||
/* shift or latch depending on previous mode */
|
||||
chainemc[(*mclength)++] = (lastmode == TEX) ? 913 : 901;
|
||||
chainemc[(*mclength)++] = chaine[start];
|
||||
if (debug_print) {
|
||||
printf("913 %d\n", chainemc[*mclength - 1]);
|
||||
printf("%s %d\n", (lastmode == TEX) ? "913" : "901", chaine[start]);
|
||||
}
|
||||
} else {
|
||||
int len;
|
||||
@ -458,7 +434,7 @@ static void pdf_numbprocess(int *chainemc, int *mclength, const unsigned char ch
|
||||
/* Initial processing of data, shared by `pdf417()` and `micropdf417()` */
|
||||
static int pdf_initial(struct zint_symbol *symbol, unsigned char chaine[], const int length, const int eci,
|
||||
const int is_micro, int chainemc[PDF_MAX_LEN], int *p_mclength) {
|
||||
int i, indexchaine, indexliste, mode;
|
||||
int i, indexchaine, indexliste, mode, currenttext;
|
||||
int liste[2][PDF_MAX_LEN] = {{0}};
|
||||
int mclength;
|
||||
const int debug_print = symbol->debug & ZINT_DEBUG_PRINT;
|
||||
@ -480,11 +456,27 @@ static int pdf_initial(struct zint_symbol *symbol, unsigned char chaine[], const
|
||||
indexliste++;
|
||||
} while (indexchaine < length);
|
||||
|
||||
/* 474 */
|
||||
pdf_smooth(liste, &indexliste);
|
||||
if (debug_print) {
|
||||
printf("\r\nInitial block pattern:\n");
|
||||
for (i = 0; i < indexliste; i++) {
|
||||
printf("Len: %d Type: ", liste[0][i]);
|
||||
switch (liste[1][i]) {
|
||||
case TEX: printf("Text\n");
|
||||
break;
|
||||
case BYT: printf("Byte\n");
|
||||
break;
|
||||
case NUM: printf("Number\n");
|
||||
break;
|
||||
default: printf("ERROR\n"); /* Should never happen */ /* Not reached */
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pdf_appendix_d_encode(liste, &indexliste, debug_print);
|
||||
|
||||
if (debug_print) {
|
||||
printf("Initial block pattern:\n");
|
||||
printf("\r\nCompacted block pattern:\n");
|
||||
for (i = 0; i < indexliste; i++) {
|
||||
printf("Len: %d Type: ", liste[0][i]);
|
||||
switch (liste[1][i]) {
|
||||
@ -530,16 +522,25 @@ static int pdf_initial(struct zint_symbol *symbol, unsigned char chaine[], const
|
||||
}
|
||||
}
|
||||
|
||||
/* Default mode for PDF417 is Text Compaction Alpha (ISO/IEC 1543:2015 5.4.2.1), and for MICROPDF417 is Byte
|
||||
* Compaction (ISO/IEC 24728:2006 5.4.3) */
|
||||
mode = is_micro ? BYT : TEX;
|
||||
currenttext = 1; /* Start in upper alpha - tracked across calls to pdf_textprocess to allow for interleaving byte shifts */
|
||||
for (i = 0; i < indexliste; i++) {
|
||||
switch (liste[1][i]) {
|
||||
case TEX: /* 547 - text mode */
|
||||
pdf_textprocess(chainemc, &mclength, chaine, indexchaine, liste[0][i], is_micro);
|
||||
pdf_textprocess(chainemc, &mclength, chaine, indexchaine, liste[0][i], mode, ¤ttext);
|
||||
mode = TEX;
|
||||
break;
|
||||
case BYT: /* 670 - octet stream mode */
|
||||
pdf_byteprocess(chainemc, &mclength, chaine, indexchaine, liste[0][i], debug_print);
|
||||
pdf_byteprocess(chainemc, &mclength, chaine, indexchaine, liste[0][i], mode, debug_print);
|
||||
if (mode != TEX || liste[0][i] != 1) { /* don't switch mode on single byte shift from text mode */
|
||||
mode = BYT;
|
||||
}
|
||||
break;
|
||||
case NUM: /* 712 - numeric mode */
|
||||
pdf_numbprocess(chainemc, &mclength, chaine, indexchaine, liste[0][i]);
|
||||
mode = NUM;
|
||||
break;
|
||||
}
|
||||
indexchaine = indexchaine + liste[0][i];
|
||||
|
||||
@ -57,7 +57,7 @@ INTERNAL_DATA_EXTERN const unsigned short pdf_rap_side[52];
|
||||
INTERNAL_DATA_EXTERN const unsigned short pdf_rap_centre[52];
|
||||
|
||||
INTERNAL void pdf_byteprocess(int *chainemc, int *mclength, const unsigned char chaine[], int start, const int length,
|
||||
const int debug);
|
||||
const int lastmode, const int debug);
|
||||
|
||||
/* vim: set ts=4 sw=4 et : */
|
||||
#endif /* Z_PDF417_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user