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Improved compression for Latin-1 encoding in Code 128

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This commit is contained in:
hooper114
2009-05-14 22:22:01 +00:00
parent 2170302bf5
commit 76e51fc0ee
3 changed files with 71 additions and 29 deletions
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55
backend/code128.c
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@@ -197,7 +197,7 @@ void c128_set_c(unsigned char source_a, unsigned char source_b, char dest[], int
int code_128(struct zint_symbol *symbol, unsigned char source[])
{ /* Handle Code 128 and NVE-18 */
int i, j, k, e_count, values[170], bar_characters, read, total_sum, nve_check;
int error_number, indexchaine, indexliste, sourcelen;
int error_number, indexchaine, indexliste, sourcelen, f_state;
char set[170], fset[170], mode, last_set, last_fset, current_set = ' ';
float glyph_count;
char dest[1000];
@@ -211,6 +211,7 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
e_count = 0;
bar_characters = 0;
nve_check = 0;
f_state = 0;
for(i = 0; i < 170; i++) {
values[i] = 0;
@@ -221,7 +222,7 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
if(sourcelen > 160) {
/* This only blocks rediculously long input - the actual length of the
resulting barcode depends on the type of data, so this is trapped later */
strcpy(symbol->errtxt, "Input too long [201]");
strcpy(symbol->errtxt, "Input too long");
return ERROR_TOO_LONG;
}
@@ -256,6 +257,23 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
}
}
}
/* Decide if it is worth reverting to 646 encodation for a few characters as described in 4.3.4.2 (d) */
if(sourcelen > 1) {
for(i = 1; i < sourcelen; i++) {
if((fset[i - 1] == 'F') && (fset[i] == ' ')) {
/* Detected a change from 8859-1 to 646 - count how long for */
for(j = 0; (fset[i + j] == ' ') && ((i + j) < sourcelen); j++);
if((j < 5) || ((j < 3) && ((i + j) == (sourcelen - 1)))) {
/* Uses the same figures recommended by Annex E note 3 */
/* Change to shifting back rather than latching back */
for(k = 0; k < j; k++) {
fset[i + k] = 'n';
}
}
}
}
}
/* Decide on mode using same system as PDF417 and rules of ISO 15417 Annex E */
indexliste = 0;
@@ -348,7 +366,7 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
if((set[i] == 'a') || (set[i] == 'b')) {
glyph_count = glyph_count + 1.0;
}
if(fset[i] == 'f') {
if((fset[i] == 'f') || (fset[i] == 'n')) {
glyph_count = glyph_count + 1.0;
}
if(((set[i] == 'A') || (set[i] == 'B')) || (set[i] == 'C')) {
@@ -380,7 +398,7 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
}
}
if(glyph_count > 80.0) {
strcpy(symbol->errtxt, "Input too long [204]");
strcpy(symbol->errtxt, "Input too long");
return ERROR_TOO_LONG;
}
@@ -423,6 +441,7 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
break;
}
bar_characters += 2;
f_state = 1;
}
/* Encode the data */
@@ -451,8 +470,8 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
}
}
if((read != 0) && (fset[read] != fset[read - 1])) {
if(fset[read] == 'F') {
if(read != 0) {
if((fset[read] == 'F') && (f_state == 0)) {
/* Latch beginning of extended mode */
switch(current_set) {
case 'A':
@@ -469,8 +488,9 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
break;
}
bar_characters += 2;
f_state = 1;
}
if(fset[read - 1] == 'F') {
if((fset[read] == ' ') && (f_state == 1)) {
/* Latch end of extended mode */
switch(current_set) {
case 'A':
@@ -487,18 +507,19 @@ int code_128(struct zint_symbol *symbol, unsigned char source[])
break;
}
bar_characters += 2;
f_state = 0;
}
}
if(fset[read] == 'f') {
/* Shift extended mode */
if((fset[read] == 'f') || (fset[read] == 'n')) {
/* Shift to or from extended mode */
switch(current_set) {
case 'A':
concat(dest, C128Table[101]);
concat(dest, C128Table[101]); /* FNC 4 */
values[bar_characters] = 101;
break;
case 'B':
concat(dest, C128Table[100]);
concat(dest, C128Table[100]); /* FNC 4 */
values[bar_characters] = 100;
break;
}
@@ -584,7 +605,7 @@ int ean_128(struct zint_symbol *symbol, unsigned char source[])
if(sourcelen > 160) {
/* This only blocks rediculously long input - the actual length of the
resulting barcode depends on the type of data, so this is trapped later */
strcpy(symbol->errtxt, "Input too long [161]");
strcpy(symbol->errtxt, "Input too long");
return ERROR_TOO_LONG;
}
@@ -701,7 +722,7 @@ int ean_128(struct zint_symbol *symbol, unsigned char source[])
}
}
if(glyph_count > 80.0) {
strcpy(symbol->errtxt, "Input too long [164]");
strcpy(symbol->errtxt, "Input too long");
return ERROR_TOO_LONG;
}
@@ -874,13 +895,13 @@ int nve_18(struct zint_symbol *symbol, unsigned char source[])
sourcelen = ustrlen(source);
if(sourcelen > 17) {
strcpy(symbol->errtxt, "Input too long [203]");
strcpy(symbol->errtxt, "Input too long");
return ERROR_TOO_LONG;
}
error_number = is_sane(NESET, source);
if(error_number == ERROR_INVALID_DATA) {
strcpy(symbol->errtxt, "Invalid characters in data [202]");
strcpy(symbol->errtxt, "Invalid characters in data");
return error_number;
}
@@ -923,13 +944,13 @@ int ean_14(struct zint_symbol *symbol, unsigned char source[])
input_length = ustrlen(source);
if(input_length > 13) {
strcpy(symbol->errtxt, "Input wrong length [721]");
strcpy(symbol->errtxt, "Input wrong length");
return ERROR_TOO_LONG;
}
error_number = is_sane(NESET, source);
if(error_number == ERROR_INVALID_DATA) {
strcpy(symbol->errtxt, "Invalid character in data [722]");
strcpy(symbol->errtxt, "Invalid character in data");
return error_number;
}