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Improved binary multiplication for large numbers

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This commit is contained in:
Robin Stuart
2018-02-11 08:00:32 +00:00
parent f655eabc12
commit 8bb4d2ce86
6 changed files with 41 additions and 125 deletions
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77
backend/mailmark.c
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@@ -293,14 +293,7 @@ int mailmark(struct zint_symbol *symbol, unsigned char source[], int length) {
for (i = 0; i < 9; i++) {
switch (pattern[i]) {
case 'F':
for (j = 0; j < 112; j++) {
temp[j] = b[j];
}
// b *= 26
for (j = 1; j < 26; j++) {
binary_add(b, temp);
}
binary_multiply(b, "26");
binary_load(temp, "0", 1);
for (j = 0; j < 5; j++) {
@@ -310,14 +303,7 @@ int mailmark(struct zint_symbol *symbol, unsigned char source[], int length) {
binary_add(b, temp);
break;
case 'L':
for (j = 0; j < 112; j++) {
temp[j] = b[j];
}
// b *= 20
for (j = 1; j < 20; j++) {
binary_add(b, temp);
}
binary_multiply(b, "20");
binary_load(temp, "0", 1);
for (j = 0; j < 5; j++) {
@@ -327,14 +313,7 @@ int mailmark(struct zint_symbol *symbol, unsigned char source[], int length) {
binary_add(b, temp);
break;
case 'N':
for (j = 0; j < 112; j++) {
temp[j] = b[j];
}
for (j = 1; j < 10; j++) {
// b *= 10
binary_add(b, temp);
}
binary_multiply(b, "10");
binary_load(temp, "0", 1);
for (j = 0; j < 4; j++) {
@@ -390,14 +369,7 @@ int mailmark(struct zint_symbol *symbol, unsigned char source[], int length) {
binary_add(cdv, destination_postcode);
// Multiply by 100,000,000
for (i = 0; i < 8; i++) {
binary_load(temp, "0", 1);
binary_add(temp, cdv);
for (j = 1; j < 10; j++) {
binary_add(cdv, temp);
}
}
binary_multiply(cdv, "100000000");
// Add Item ID
binary_load(temp, "0", 1);
@@ -406,26 +378,12 @@ int mailmark(struct zint_symbol *symbol, unsigned char source[], int length) {
}
binary_add(cdv, temp);
if (length == 22) {
if (length == 22) {
// Barcode C - Multiply by 100
for (i = 0; i < 2; i++) {
binary_load(temp, "0", 1);
binary_add(temp, cdv);
for (j = 1; j < 10; j++) {
binary_add(cdv, temp);
}
}
binary_multiply(cdv, "100");
} else {
// Barcode L - Multiply by 1,000,000
for (i = 0; i < 6; i++) {
binary_load(temp, "0", 1);
binary_add(temp, cdv);
for (j = 1; j < 10; j++) {
binary_add(cdv, temp);
}
}
binary_multiply(cdv, "1000000");
}
// Add Supply Chain ID
@@ -436,12 +394,7 @@ int mailmark(struct zint_symbol *symbol, unsigned char source[], int length) {
binary_add(cdv, temp);
// Multiply by 15
binary_load(temp, "0", 1);
binary_add(temp, cdv);
for (j = 1; j < 15; j++) {
binary_add(cdv, temp);
}
binary_multiply(cdv, "15");
// Add Class
binary_load(temp, "0", 1);
@@ -451,12 +404,7 @@ int mailmark(struct zint_symbol *symbol, unsigned char source[], int length) {
binary_add(cdv, temp);
// Multiply by 5
binary_load(temp, "0", 1);
binary_add(temp, cdv);
for (j = 1; j < 5; j++) {
binary_add(cdv, temp);
}
binary_multiply(cdv, "5");
// Add Format
binary_load(temp, "0", 1);
@@ -466,12 +414,7 @@ int mailmark(struct zint_symbol *symbol, unsigned char source[], int length) {
binary_add(cdv, temp);
// Multiply by 4
binary_load(temp, "0", 1);
binary_add(temp, cdv);
for (j = 1; j < 4; j++) {
binary_add(cdv, temp);
}
binary_multiply(cdv, "4");
// Add Version ID
binary_load(temp, "0", 1);