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Improved HTML entity handling

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Now handles quot and frasl as suggested by Ian Jeffray and also allocates memory properly, preventing SIGSEGV for Code 128 full of ampersands.
This commit is contained in:
Robin Stuart 2019-10-30 08:40:26 +00:00
parent 7bcc0252a9
commit 0fe9051324
1 changed files with 56 additions and 50 deletions
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84
backend/svg.c
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@ -2,7 +2,7 @@
/*
libzint - the open source barcode library
Copyright (C) 2009-2018 Robin Stuart <rstuart114@gmail.com>
Copyright (C) 2009-2019 Robin Stuart <rstuart114@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
@ -41,55 +41,48 @@
#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 &gt;
* < becomes &lt;
* & becomes &amp;
*/
void make_html_friendly(unsigned char * string, char * html_version) {
/* Converts text to use HTML entity codes */
int i, html_pos;
int i, html_pos;
html_pos = 0;
html_version[html_pos] = '\0';
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] = ';';
for (i = 0; i < ustrlen(string); i++) {
switch(string[i]) {
case '>':
strcat(html_version, "&gt;");
html_pos += 4;
html_version[html_pos] = '\0';
break;
break;
case '<':
html_version[html_pos] = '&';
html_version[html_pos + 1] = 'l';
html_version[html_pos + 2] = 't';
html_version[html_pos + 3] = ';';
case '<':
strcat(html_version, "&lt;");
html_pos += 4;
html_version[html_pos] = '\0';
break;
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] = ';';
case '&':
strcat(html_version, "&amp;");
html_pos += 5;
html_version[html_pos] = '\0';
break;
break;
default:
case '"':
strcat(html_version, "&quot;");
html_pos += 6;
break;
case '/':
strcat(html_version, "&frasl;");
html_pos += 7;
break;
default:
html_version[html_pos] = string[i];
html_pos++;
html_version[html_pos] = '\0';
break;
}
}
}
}
int svg_plot(struct zint_symbol *symbol) {
@ -104,10 +97,24 @@ int svg_plot(struct zint_symbol *symbol) {
struct zint_vector_circle *circle;
struct zint_vector_string *string;
int html_len = strlen((char *)symbol->text) + 1;
for (int i = 0; i < strlen((char *)symbol->text); i++) {
switch(symbol->text[i]) {
case '>':
case '<':
case '"':
case '&':
case '/':
html_len += 7;
break;
}
}
#ifndef _MSC_VER
unsigned char html_string[200];
char html_string[html_len];
#else
unsigned char* html_string = (unsigned char*) _alloca(200);
char* html_string = (unsigned char*) _alloca(html_len);
#endif
/* Check for no created vector set */
@ -139,7 +146,6 @@ int svg_plot(struct zint_symbol *symbol) {
fprintf(fsvg, " <rect x=\"0\" y=\"0\" width=\"%d\" height=\"%d\" fill=\"#%s\" />\n", (int) ceil(symbol->vector->width), (int) ceil(symbol->vector->height), symbol->bgcolour);
rect = symbol->vector->rectangles;
while (rect) {
fprintf(fsvg, " <rect x=\"%.2f\" y=\"%.2f\" width=\"%.2f\" height=\"%.2f\" />\n", rect->x, rect->y, rect->width, rect->height);