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Make text elements compatable with HTML in SVG

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Correctly encodes less-than, greater-than and ampersand.
Fixes #167 reported by Ian Jeffray
This commit is contained in:
Robin Stuart 2019-10-16 18:42:22 +01:00
parent d8b576164f
commit b1113db942
1 changed files with 59 additions and 1 deletions
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60
backend/svg.c
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@ -41,6 +41,57 @@
#include "common.h"
void make_html_friendly(unsigned char * string, unsigned char * html_version) {
/* Convert text into HTML friendly format by doing the following:
* > becomes >
* < becomes &lt;
* & becomes &amp;
*/
int i, html_pos;
html_pos = 0;
html_version[html_pos] = '\0';
for (i = 0; i < ustrlen(string); i++) {
switch(string[i]) {
case '>':
html_version[html_pos] = '&';
html_version[html_pos + 1] = 'g';
html_version[html_pos + 2] = 't';
html_version[html_pos + 3] = ';';
html_pos += 4;
html_version[html_pos] = '\0';
break;
case '<':
html_version[html_pos] = '&';
html_version[html_pos + 1] = 'l';
html_version[html_pos + 2] = 't';
html_version[html_pos + 3] = ';';
html_pos += 4;
html_version[html_pos] = '\0';
break;
case '&':
html_version[html_pos] = '&';
html_version[html_pos + 1] = 'a';
html_version[html_pos + 2] = 'm';
html_version[html_pos + 3] = 'p';
html_version[html_pos + 4] = ';';
html_pos += 5;
html_version[html_pos] = '\0';
break;
default:
html_version[html_pos] = string[i];
html_pos++;
html_version[html_pos] = '\0';
break;
}
}
}
int svg_plot(struct zint_symbol *symbol) {
FILE *fsvg;
int error_number = 0;
@ -53,6 +104,12 @@ int svg_plot(struct zint_symbol *symbol) {
struct zint_vector_circle *circle;
struct zint_vector_string *string;
#ifndef _MSC_VER
unsigned char html_string[200];
#else
unsigned char* html_string = (unsigned char*) _alloca(200);
#endif
/* Check for no created vector set */
/* E-Mail Christian Schmitz 2019-09-10: reason unknown Ticket #164*/
if (symbol->vector == NULL) {
@ -122,7 +179,8 @@ int svg_plot(struct zint_symbol *symbol) {
while (string) {
fprintf(fsvg, " <text x=\"%.2f\" y=\"%.2f\" text-anchor=\"middle\"\n", string->x, string->y);
fprintf(fsvg, " font-family=\"Helvetica\" font-size=\"%.1f\" fill=\"#%s\" >\n", string->fsize, symbol->fgcolour);
fprintf(fsvg, " %s\n", string->text);
make_html_friendly(string->text, html_string);
fprintf(fsvg, " %s\n", html_string);
fprintf(fsvg, " </text>\n");
string = string->next;
}