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Adjust error correction levels.

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Now encourages error correction levels as recommended in Annex E of ISO/IEC 15438
Thanks to Terry Burton
This commit is contained in:
Robin Stuart 2011-01-08 22:58:18 +00:00
parent dfa9b59ed2
commit b808ad9494
1 changed files with 5 additions and 19 deletions
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24
backend/pdf417.c
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@ -511,10 +511,8 @@ int pdf417(struct zint_symbol *symbol, unsigned char chaine[], int length)
/* 752 - Now take care of the number of CWs per row */
if (symbol->option_1 < 0) {
/* note that security level 8 is never used automatically */
symbol->option_1 = 7;
if(mclength <= 1280) { symbol->option_1 = 6; }
if(mclength <= 640) { symbol->option_1 = 5; }
symbol->option_1 = 6;
if(mclength <= 863) { symbol->option_1 = 5; }
if(mclength <= 320) { symbol->option_1 = 4; }
if(mclength <= 160) { symbol->option_1 = 3; }
if(mclength <= 40) { symbol->option_1 = 2; }
@ -527,30 +525,18 @@ int pdf417(struct zint_symbol *symbol, unsigned char chaine[], int length)
longueur = mclength;
if(symbol->option_2 > 30) { symbol->option_2 = 30; }
if(symbol->option_2 < 1) {
/* This is a much more simple formula to Grand Zebu's -
it does not try to make the symbol square */
symbol->option_2 = 0.5 + sqrt((longueur + k) / 3.0);
}
if(((longueur + k) / symbol->option_2) > 90) {
/* stop the symbol from becoming too high */
symbol->option_2 = symbol->option_2 + 1;
}
/* Reduce the correction level if there isn't room */
/* while((longueur + k > PDF_MAX) && (symbol->option_1 > 0)) {
symbol->option_1 = symbol->option_1 - 1
for(loop = 0; loop <= (symbol->option_1 + 1); loop++)
{
k *= 2;
}
} */
/* this bit of the code would allow Zint to happily encode 2698 code words with
only 2 check digits, so I have abandoned it! - Zint now insists on a proportional
amount of check data unless overruled by the user */
if(longueur + k > symbol->option_3) {
if(longueur + k > 928) {
/* Enforce maximum codeword limit */
return 2;
}
if(((longueur + k) / symbol->option_2) > 90) {
return 4;
}